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WC6400 Service Manual 1016 2009

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254 views1,166 pages

WC6400 Service Manual 1016 2009

Uploaded by

Jakub Haliena

We take content rights seriously. If you suspect this is your content, claim it here.

Available Formats

Download as PDF, TXT or read online on Scribd

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Workcentre® 6400

Multifunction Printer

Workcentre 6400 ®

Service Manual
Service Manual
701P50229

WorkCentre® 6400
Multifunction Printer

Warning
The following servicing instructions are for use by qualified service
personnel only. To avoid personal injury, do not perform any servicing
other than that contained in the operating instructions, unless you are
qualified to do so.

Second Printing: October 2009

Prepared By:
Xerox Corporation
XOG Worldwide Product Training and Information
26600 SW Parkway
Wilsonville, OR 97070

Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form
without permission of Xerox Corporation.

Copyright protection claimed includes all forms and matters of copyrightable materials and information now allowed by statutory or judicial law
or hereinafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as
styles, templates, icons, screen displays, looks, etc.

Xerox technical training materials and service manuals are intended for use by authorized Xerox service technicians and service partners only
and are not for resale. These materials may not be distributed, copied, or otherwise reproduced without prior written consent from Xerox
Corporation.

XEROX®, CentreWare®, Phaser®, PrintingScout®, and Walk-Up® are trademarks of Xerox Corporation in the United States and/or other
countries.

Adobe® and PostScript® are trademarks of Adobe Systems Incorporated in the United States and/or other countries.

Apple®, Bonjour®, ColorSync®, EtherTalk®, Macintosh®, and Mac OS® are trademarks of Apple Computer, Inc. in the United States and/or
other countries.

PCL® is a trademark of Hewlett-Packard Corporation in the United States and/or other countries.

Microsoft®, Vista™, Windows®, and Windows Server™ are trademarks of Microsoft Corporation in the United States and/or other countries.

Novell®, NetWare®, and IPX/SPX™ are trademarks of Novell, Incorporated in the United States and/or other countries.

SunSM, Sun Microsystems™, and Solaris™ are trademarks of Sun Microsystems, Incorporated in the United States and/or other countries.

UNIX® is a registered trademark in the US and other countries, licensed exclusively through X/Open Company Limited.

As an ENERGY STAR ® partner, Xerox Corporation has determined that this product meets the ENERGY STAR guidelines for energy
efficiency. The ENERGY STAR name and logo are registered U.S. marks.

PANTONE® Colors generated may not match PANTONE-identified standards. Consult current PANTONE Publications for accurate color.
PANTONE® and other Pantone, Inc. trademarks are the property of Pantone, Inc. © Pantone, Inc., 2000.

ii WorkCentre 6400 Service Manual

Table of Contents

Paper Jam Under the Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75
Paper Jam Behind the Right Side Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
Paper Jam Behind the Right Side Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-81
Fuser System Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84
Fuser System Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-86
Fuser System Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-87
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-90
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-92
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-94
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-96
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-98
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-100
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-102
Finisher Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-104
Paper Jam in the Finisher Transport Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-106
Paper Jam at Finisher Top Output Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-108
Paper Jam at Finisher Main Output Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-110
Staple Jam in the Finisher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-112
Scanner Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-114
Document Feeder (DADF) Disconnected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-116
Scanner Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-117
Internal Communication Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-119
Network Controller Internal Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-121
Out of Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-123
Fax Services Cannot Register/ Unregister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-124
A Fax Memory Error has Occurred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-125
Fax Line 1 Unavailable or No Dial Tone Detected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-127
Network Controller Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-129
Output Device Configuration Mismatch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-130
System Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-131
Tray 3 or Tray 4 Right Side Door is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-132
Close Duplex Door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-134
Close Finisher Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-136
Lower the Control Panel Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-138
The Finisher Front Door is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-139
Document Feeder Cover is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-141
The Right Side Door is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-142
Duplex Unit Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-144
Tray 1 Assembly Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-146
Xerographic System Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-148
Xerographic System Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-150
Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-152
Cyan, Magenta, Yellow, or Black Toner Cartridge is Missing or not Seated Properly . . . . . . . . . . . . . . . . 3-152
Finisher Main Tray is Full. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-154
Finisher Top Tray is Full. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-156
Fuser is Missing or Not Installed Correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-158
Install or Reseat Imaging Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-160
Non-Xerox Imaging Unit in Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-162
Output Tray is Full (No Finisher) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-164
Tray 2 is Empty - Add Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-166
Tray 2 is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-168
Tray 3 or 4 is Empty - Add Paper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-170
Tray 3 or Tray 4 is Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-172

vi WorkCentre 6400 Service Manual

Table of Contents

4 General Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Power On Self Test (POST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
POST LED’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Service Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Entering Service Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Using Service Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Service Diagnostics Menu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Menu Map (page 1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Menu Map (page 2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Printer Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Engine Motors and Clutches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
ADF Motors and Clutches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
ADF Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Engine Sensors and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Sensors (Paper Path) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Duplex Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Duplex Unit Sensors and Motors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Optional 500-Sheet Feeder Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Optional 500-Sheet Feeder Sensors, Switches, Clutch, Motor, and Board. . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Finisher Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Finisher Sensors, Solenoids, Motors, and Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Finisher Sensors, Solenoids, Motors, and Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Finisher Tray Sensors and Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Finisher Paper Path Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Service Diagnostics Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Service Diagnostic Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Service Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
dc104 - Usage Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
dc108 - Software Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
dc120 - Fault Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
dc122 - Fault History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
dc135 - CRU/HFSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
dc140 - Analog Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
dc312 - Network Echo Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
dc330 - Component Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
dc575 - Scanner Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
dc612 - Print Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
dc640 - Video Path Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
dc103 - Billing Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
dc120 - Fault Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
dc122 - Fault History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
dc135 - CRU/HFSI Status and Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
dc137 - PagePack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45
Call Closeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46
Service Mode Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

WorkCentre 6400 Service Manual vii

Table of Contents

General Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-47

Entering Machine Status/ Tools Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-47
Resetting UI to Factory Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48
Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49
Service Copy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50
Cloning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
Control Panel Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
Control Panel LED’s Do Not Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
Control Panel LED’s are On, Control Panel Display is Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55
Inoperable Printer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Printer Continually Displays “The Fuser is Warming Up” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
System Does Not Respond . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Power Cycle the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57
AC Power Supply Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58
DC Power Supply Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59
LVPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59
Image Processor Board Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60
DADF Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
Frequent Paper Jam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
Frequent Double Feed and Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62
Scanner Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-63
Scanner Fault Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-63
Fax Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-65
Initial Fax Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-65
Fax Troubleshooting Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-66
Fax Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68
Troubleshooting Sending or Receiving a Fax. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69
Operating System and Application Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72
Verify Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72
Windows 2000, Windows XP, Windows Server Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72
Verify Driver Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-73
Macintosh Troubleshooting (Mac OS 10.3 and Higher). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-73
UNIX/ Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-74

5 Print-Quality Troubleshooting
Print-Quality Problems Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Defects Associated with Printer, DADF, and Scanner Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Checklist Before Troubleshooting Print-Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Checking the Printer Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Print-Quality Troubleshooting Pages and Test Patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Accessing Troubleshooting Print-Quality Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Print Test Patterns (dc612) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Cyan 50% Fill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Magenta 50% Fill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Yellow 50% Fill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Black 50% Fill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Manufacturing Test Page 1/ Registration Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Manufacturing Test 2/ Delta-E Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Manufacturing Test 3/ Ghosting Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Print-Quality Troubleshooting Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Print-Quality Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Environmental Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Quality Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Paper Storage and Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Printer Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

viii WorkCentre 6400 Service Manual

Table of Contents

Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22

Print-Quality and Copy/ Scan Defect Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
Repeating Defect Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Print-Quality Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Vertical Bands, Voids, or Streaks in All Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Horizontal Bands, Voids, or Streaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
Uneven Density in the Feed Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
Uneven Density in the Scan Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32
Light Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34
Gradation Reproduction Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36
Background Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38
Poor Color Reproduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40
Void Areas or White Spots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-42
Random Spots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-44
Blurred Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45
Blank Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46
Black Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-48
Color Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-50
Incomplete Fusing or Cold Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-52
Residual Image, Ghosting, or Hot Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-53
Smudges or Smears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-55
Smears or Streaks on Back Side of Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-56
Uneven Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-58
Defects in One Color (C, M, Y, or K) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-60
Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-62
Damaged Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-64
Copy/ Scan Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-66
Lines, Spots, Streaks & Smears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-66
Background Color, Text, and Images on Copies are Too Light, Too Dark, or Blurry . . . . . . . . . . . . . . . . . . 5-68
Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-69
Damaged Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-71
Wavy Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-72
Spots Present in Copies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-74
Image Does Not Appear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-75
Large Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-76
Image Mis-registered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-77
Image Unclear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-79
Image Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-80

6 Adjustments and Calibrations

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Accessing the Service Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Accessing the Machine Status/Tools Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Tray Adjustment (Tray 3/4 Margins) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
dc130 - Image Position (Margin Adjustment) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
dc131 - NVM Read/Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
dc301 - NVM Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
dc361 - NVM Save and Restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
dc608 - Document Feeder Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
dc609 - Document Glass Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
dc909 - Calibrate for Paper Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
dc936 - Image Quality Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
dc960 - Altitude Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

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Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Color Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Altitude Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Calibrate Paper Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Document Feeder Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Document Glass Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
Image Position (Margin Adjustment). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Image Quality Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Control Panel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Scanner Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

7 Cleaning and Maintenance

Service Maintenance Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Cleaning the Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Inspecting and Cleaning the DADF Feed Rollers and Pads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Cleaning the Tray 1 Feed Roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Cleaning the Tray 2/ 3/ 4 Feed Roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Cleaning the Duplex Unit Feed Rollers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Cleaning the Tray 3/ Tray 4 Transport Rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Cleaning the Laser Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Cleaning the IDC Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
Cleaning the Document Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19
RIP (Repair, Inspect, and Prevent) Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19

8 Service Parts Disassembly

Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Standard Orientation of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Notations in the Disassembly Text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Fastener Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
Maintenance Items and Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Tray 1 Separation Roller Assembly (PL5.25). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Tray 1 Feed Roller (PL5.29). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12
Toner Cartridge (Y/ M/ C/ K) (PL6.19 - 6.22). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
Imaging Unit (Y/ M/ C/ K) (PL6.23 - 6.26). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17
Ozone Filter (PL7.17). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18
Waste Cartridge (PL9.09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19
Transfer Belt (PL14.16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
Transfer Roller (PL16.20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
Fuser Unit (PL18.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24
Tray 2/ 3/ 4 Separation Roller Assembly (PL21.7, PL32.22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Tray 2 Feed Roller (PL21.27). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-27
Tray 3/ Tray 4 Feed Roller (PL32.05). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-29
Duplex Automatic Document Feeder (DADF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-31
DADF Separator (Feed) Roller Assembly (PL1.02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-31
DADF Paper Tray Assembly (PL1.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33
DADF Top Cover Assembly (PL1.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35
Duplex Automatic Document Feeder Assembly (PL1.06) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-38
DADF Separator Pad Assembly (PL1.01), Holder Assemblies (PL1.07, PL1.08), Pressure Spring (PL1.09)8-40

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Scanner Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42

Scanner Assembly (PL2.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42
Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46
Control Panel (PL2.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46
Rear Cover (PL3.02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-47
Right Rear Cover (PL3.03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48
Right Front Cover (PL3.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-50
Front Door Assembly (PL3.10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-51
Left Side Cover (PL3.26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-52
Paper Trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-53
Tray 1 (PL5.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-53
Tray 2 Paper Size Switch (PL7.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-54
Tray 2 Paper Size Switch Actuator (PL7.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-55
Tray 2 Paper Empty Sensor (PS8) (PL9.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-56
Tray 2 Paper Empty Sensor Actuator (PL9.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-57
Tray 2 (PL21.28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-58
Paper Feed and Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-59
Pressure/ Retraction Clutch-1 (CL4) (PL12.06). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-59
Vertical Transport Assembly (Right Door) (PL15.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-61
Registration Clutch (CL2) (PL16.18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-63
Registration Roller Assembly (PL16.22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65
Upper Horizontal Transport Assembly (PL17.37) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-68
Lower Horizontal Transport Assembly (PL17.48) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-69
Fuser Pawl (PL18.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-71
Paper Exit Assembly (PL19.25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-72
Tray 2 Separation Roller Clutch (PL21.26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-73
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-75
Control Panel PWB (PL2.14-15), Control Panel LCD Assembly (PL2.16), Ribbon Cables (PL2.17-19). . . . 8-75
Toner Low Sensor Board (TLSB) Assembly (PL6.18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
Low Voltage Power Supply (LVPS) (PL10.17). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-82
Temperature/ Humidity Sensor (PL11.01). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-84
Registration Sensor (PS9) (PL11.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-85
OHP Sensor (PS5) (PL11.28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-86
Image Density Control Sensor Board (IDCSB) (Front and Rear) (PL14.13). . . . . . . . . . . . . . . . . . . . . . . . . 8-87
Hard Disk Drives (PL20.03). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-91
RF Protective Shield (PL20.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-97
Image Processor Board (PL20.07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-98
MCU Board (Engine Control Board) (PL20.09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-101
High Voltage Power Supply-1 (PL20.16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-106
High Voltage Power Supply-2 (PL20.21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-109
Card Cage (PL20.27) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-111
Fax Board (PL20.42) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-115
NVM Module (PL20.43). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-116
RAM (PL20.44) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-117
Xerographics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-119
CRUM Reader (PL6.02). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-119
Waste Toner Auger Assembly (PL8.21). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-123
Front Imaging Unit Holder (PL9.10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-124
Rear Imaging Unit Holder (PL9.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-125
Laser Unit (PL10.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-126
Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-135
Pressure/ Retraction Sensor 2 (PS13) (PL11.4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-135
2nd Image Transfer Pressure/ Retraction Drive Assembly (PL11.8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-136
Paper Take-Up Drive Assembly (PL12.15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-139
Main Drive Assembly (PL12.22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-142
Hopper Drive Assembly (PL13.20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-144

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Fans and Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-146

Ozone Ventilation Fan (FM13) (PL7.20). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-146
DC Power Supply Fan (FM11) (PL13.02). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-148
Fuser Fan (FM12) (PL13.02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-150
LVPS Cooling Fan (FM14) (PL20.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-152
I/P Board Cooling Fan (FM15) (PL20.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-153
Color Photo Conductor Drum Motor (M3) (IBT Motor) (PL12.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-155
Developer Motor K (M5) (PL12.02). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-156
Intermediate Transport Motor (M1) (PL12.02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-157
Fuser Motor (M2) (PL12.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-158
Toner Supply Motor (Y/M) (M6) (PL13.22). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-159
Toner Supply Motor (C/K) (M7) (PL13.22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-160
Optional 500-Sheet Feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-161
Optional 500-Sheet Feeder Board (PL28.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-161
Tray 3/ Tray 4 Paper Size Switch Actuator (PL28.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-163
Tray 3/ Tray 4 Paper Size Switch (PL28.14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-165
Optional 500-Sheet Feeder (PL28.25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-166
Tray 3/ Tray 4 Paper Feed Sensor Actuator (PL29.19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-168
Tray 3/ Tray 4 Paper Feed Clutch-1 (CL6) (PL30.03). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-169
Transport Motor (M16) (PL30.12). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-171
Tray 3/ Tray 4 (PL31.24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-172
Duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-173
Duplex Unit Right Cover (PL22.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-173
Duplex Unit Reverse Motor (M9) (PL22.13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-174
Duplex Unit (PL22.23) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-175
Duplex Unit Control Board (PL23.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-177
Duplex Unit Transport Motor (M8) (PL23.13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-178
Finisher (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-179
Finisher Rear Cover (PL35.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-179
Finisher Front Cover (PL35.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-180
Finisher Assembly (PL35.09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-182
Finisher Cover Assembly (PL36.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-183
Paper Level Sensor (PS9/ PS10) (PL36.14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-185
Finisher Right Plate (PL37.01). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-186
Switch Assembly (MS1) (PL37.08) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-187
Finisher Top Right Cover (PL38.04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-188
Entrance Sensor (PS1) (PL38.10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-189
Neutralizing Brush Assembly (PL38.17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-190
Finisher Top Tray (PL38.18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-191
Paper Exit Assembly (PL38.24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-192
Finisher Guide Assembly (PL38.25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-195
Finisher Entrance Solenoid (SL1) (PL39.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-196
Finisher Roll Assembly (PL40.07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-198
Storage Section Sensor (PS7) (PL41.02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-199
Roller Assembly (PL44.15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-200
Stapler Assembly (PL45.11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-201
Alignment Belt Up/ Down Solenoid (SL3) (PL46.04). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-204
Finisher Control Board (PL46.16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-205
Finisher Transport Motor (M3) (PL46.20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-206
Finisher Exit Motor (M4) (PL46.20). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-209
Finisher Motor Fan (FM1) (PL46.24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-212
Finisher Exit Roller Up/ Down Motor (M5) (PL47.05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-213
Finisher Main Tray (PL48.18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-216
Printer Stand (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-217
Stand Assembly (PL49.01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-217

xii WorkCentre 6400 Service Manual

The WorkCentre 6400 Service Manual is the primary document used for
repairing, maintaining, and troubleshooting the multifunction printer. Use this
manual as your primary source for understanding the operational
characteristics of the multifunction printer and all available options. This
manual describes specifications, theory, and the diagnosis and repair of
problems occurring in the multifunction printer and attached options. Also
included are detailed replacement procedures, parts lists, and wiring
diagrams.

Manual Terms

Various terms are used throughout this manual to either provide additional
information on a specific topic or to warn of possible danger present during a
procedure or action. Be aware of all symbols and terms when they are used,
and always read Note, Caution, and Warning statements.

Note
A note indicates an operating or maintenance procedure, practice or
condition that is necessary to efficiently accomplish a task.
A note can provide additional information related to a specific subject or
add a comment on the results achieved through a previous action.

Caution
A caution indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, results in damage to, or destruction
of, equipment.

Warning
A warning indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, results in injury or loss of life.

Product Terms

Caution: A personal injury hazard exists that may not be apparent. For
example, a panel may cover the hazardous area.
Danger: A personal injury hazard exists in the area where you see the sign.

WorkCentre 6400 Service Manual xvii

Manual Organization

The WorkCentre 6400 Service Manual is the primary document used for
repairing, maintaining, and troubleshooting the printer. Use this manual as
your primary resource for understanding the operational characteristics of the
printer and all available options. This manual describes specifications, theory,
and the diagnosis and repair of problems occurring in the print engine and
attached options. Also included are detailed replacement procedures, parts
lists, and wiring diagrams.
The WorkCentre 6400 Service Manual contains these sections:
Introductory, Safety, and Regulatory Information: This section contains important
safety information and regulatory requirements.
Section 1 - General Information: This section contains an overview of the
printer’s operation, configuration, specifications, and consumables.
Section 2 - Theory of Operation: This section contains detailed functional
information on the print engine components.
Section 3 - Error Codes and Messages: This section provides detailed
troubleshooting procedures for error messages and codes generated by
resident diagnostics.
Section 4 - General Troubleshooting: This section contains the operation of
Power On Self Test (POST) and Service Diagnostics. In addition, this section
includes troubleshooting methods for situations where error indicator is not
available.
Section 5 - Print-Quality Troubleshooting: This section focuses on techniques to
correct image quality problems associated with the printer output.
Section 6 - Adjustments and Calibrations: This section provides procedures for
the adjustment of the print engine components.
Section 7 - Cleaning and Maintenance: This section provides periodic cleaning
procedures for the printer.
Section 8 - Service Parts Disassembly: This section contains removal
procedures for spare parts listed in the Parts List. A replacement procedure is
included when necessary.
Section 9 - Parts List: This section contains exploded views of the print engine
and optional Field Replaceable Units (FRUs), as well as part numbers for
orderable parts.
Section 10 - Plug/Jack and Wiring Diagrams: This section contains the plug/jack
locations and the wiring diagrams for the printer.
Appendix A - Reference: This section provides an illustration of the printer’s
Control Panel menu structure, printer firmware update instructions, a list of
printer error chain link codes, and a list of acronyms and abbreviations.

xviii WorkCentre 6400 Service Manual

Symbols Marked on the Product

Danger invisible laser radiation when open. Avoid direct exposure

to beam.

Hot surface on or in the printer. Use caution to avoid personal

injury.

Use caution (or draws attention to a particular component). Refer

to the manual(s) for information.

Fuser Temperature

s6400mfp-532

Do not touch the item.

Do not expose the item to light.

Do not burn the item.

WorkCentre 6400 Service Manual xix

Do not apply pressure or place heavy item on the Finisher.

s6400mfp-531

Do not counterfeit.

s6400mfp-530

Recycle the item.

xx WorkCentre 6400 Service Manual

Power Safety Precautions

Power Source

For 115 VAC printers, do not apply more than 127 volts RMS between the
supply conductors or between either supply conductor and ground. For 230
VAC printers, do not apply more than 254 volts RMS between the supply
conductors or between either supply conductor and ground. Use only the
specified power cord and connector. This manual assumes that the reader is
a qualified service technician.

Plug the three-wire power cord (with grounding prong) into a grounded AC
outlet only. If necessary, contact a licensed electrician to install a properly
grounded outlet. If the product loses its ground connection, contact with
conductive parts may cause an electrical shock. A protective ground
connection by way of the grounding conductor in the power cord is essential
for safe operation.

Disconnecting Power

Warning
Turning the power Off using the power switch does not completely de-
energize the printer. You must also disconnect the power cord from the
printer’s Alternating Current (AC) inlet. Disconnect the power cord by
pulling the plug, not the cord.

Disconnect the power cord in the following cases:

■ if the power cord or plug is frayed or otherwise damaged,

■ if any liquid or foreign material is spilled into the product,

■ if the printer is exposed to any excess moisture,

■ if the printer is dropped or damaged,

■ if you suspect that the product needs servicing or repair,

■ whenever you clean the product.

Telephone Line Cord

Caution
To reduce the risk of fire, use only No. 26 American Wire Gauge (AWG) or
larger telecommunication line cord.

WorkCentre 6400 Service Manual xxi

Electrostatic Discharge Precautions

Some semiconductor components, and the respective sub-assemblies that

contain them, are vulnerable to damage by Electrostatic Discharge (ESD).
These components include Integrated Circuits (ICs), Large-Scale Integrated
circuits (LSIs), field-effect transistors, and other semiconductor chip
components. The following techniques will reduce the occurrence of
component damage caused by static electricity.
Be sure the power is Off to the chassis or circuit board, and observe all other
safety precautions.

■ Immediately before handling any semiconductor components assemblies,

drain the electrostatic charge from your body. This can be accomplished
by touching an earth ground source or by wearing a wrist strap device
connected to an earth ground source. Wearing a wrist strap will also
prevent accumulation of additional bodily static charges. Be sure to
remove the wrist strap before applying power to the unit under test to
avoid potential shock.

■ After removing a static sensitive assembly from its anti-static bag, place it
on a grounded conductive surface. If the anti-static bag is conductive, you
may ground the bag and use it as a conductive surface.

■ Do not use freon-propelled chemicals. These can generate electrical

charges sufficient to damage some devices.

■ Do not remove a replacement component or electrical sub-assembly from

its protective package until you are ready to install it.

■ Immediately before removing the protective material from the leads of a

replacement device, touch the protective material to the chassis or circuit
assembly into which the device will be installed.

■ Minimize body motions when handling unpacked replacement devices.

Motion such as your clothes brushing together, or lifting a foot from a
carpeted floor can generate enough static electricity to damage an
electro-statically sensitive device.

■ Handle IC’s and Erasable Programmable Read-Only Memories

(EPROM’s) carefully to avoid bending pins.

■ Pay attention to the direction of parts when mounting or inserting them on

Printed Circuit Boards (PCB’s).

xxii WorkCentre 6400 Service Manual

Service Safety Summary

General Guidelines

For qualified service personnel only: Refer also to the preceding “Power Safety
Precautions” on page xxi.
Avoid servicing alone: Do not perform internal service or adjustment of this
product unless another person capable of rendering first aid or resuscitation is
present.
Use care when servicing with power: Dangerous voltages may exist at several
points in this product. To avoid personal injury, do not touch exposed
connections and components while power is On. Disconnect power before
removing the power supply shield or replacing components.
Do not wear jewelry: Remove jewelry prior to servicing. Rings, necklaces, and
other metallic objects could come into contact with dangerous voltages and
currents.

Warning Labels

Read and obey all posted warning labels. Throughout the printer, warning
labels are displayed on potentially dangerous components. As you service the
printer, check to make certain that all warning labels remain in place.

Safety Interlocks

Make sure all covers are in place and all Interlock Switches are functioning
correctly after you have completed a printer service call. If you bypass an
Interlock Switch during a service call, use extreme caution when working on
or around the printer.

Class 1 Laser Product

The product is certified to comply with Laser Product Performance Standards

set by the U.S. Department of Health and Human Services as a Class 1 Laser
Product. This means that this product does not emit hazardous laser
radiation; which is possible only because the laser beam is totally enclosed
during all modes of customer operation. When servicing the printer or laser
unit, follow the procedures specified in this manual and there will be no
hazards from the laser.

WorkCentre 6400 Service Manual xxiii

Servicing Electrical Components

Before starting any service procedure, switch the printer power Off and
unplug the power cord from the wall outlet. If you must service the printer with
power applied, be aware of the potential for electrical shock.

Warning
Do not touch any electrical component unless you are instructed to do so
by a service procedure.

Servicing Mechanical Components

When servicing mechanical components within the printer, manually rotate

the Drive Assemblies, Rollers, and Gears.

Warning
Do not try to manually rotate or manually stop the drive assemblies while
any printer motor is running.

Servicing Fuser Components

Warning
This printer uses heat to fuse the toner image to paper. The Fuser is
VERY HOT. Turn the printer power Off and wait at least 45 minutes for the
Fuser to cool before attempting to service the Fuser or adjacent
components.

xxiv WorkCentre 6400 Service Manual

Moving the Printer

Warning
Parts of the printer are hot. Wait at least 30 minutes for the printer to cool
before moving or packing the printer.

■ Use the power switch to turn Off the printer, and unplug all cables and
cords. Do not turn the printer Off by pulling the power cord or using a
power-strip with an On/Off switch.

Warning
Back injury could result if you do not lift the printer properly.

■ The printer is heavy and must be lifted by two people. Use safety lifting
and handling techniques when moving the printer.

■ Always move the printer separately from the Optional Tray 3/4.

59 kg
130 lb.

s6400mfp-738

When shipping the printer, repack the printer using the original packing
material and boxes or a Xerox packaging kit. Instructions for repacking the
printer are included in the kit. If you do not have all the original packaging, or
are unable to repackage the printer, contact your local Xerox service
representative.

Caution
Failure to repackage the printer properly for shipment can result in
damage to the printer. Damage to the printer caused by improper
packaging is not covered by the Xerox warranty, service agreement, or
Total Satisfaction Guarantee.

WorkCentre 6400 Service Manual xxv

Regulatory Information

Xerox has tested this product to electromagnetic emission and immunity

standards. These standards are designed to mitigate interference caused or
received by this product in a typical office environment.

United States (FCC Regulations)

This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the Federal Communications
Commission (FCC) Rules. These limits are designed to provide reasonable
protection against harmful interference in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy. If it is not
installed and used in accordance with these instructions, it may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his/her own expense.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment Off and On, the
user is encouraged to try to correct the interference by one or more of the
following measures:

■ Reorient or relocate the receiver.

■ Increase the separation between the printer and the receiver.

■ Connect the equipment into an outlet on a circuit different from that which
the receiver is connected.

■ Consult the dealer or an experienced radio/television technician for help.

Any changes or modifications not expressly approved by Xerox could void the
user's authority to operate the equipment. To ensure compliance with Part 15
of the FCC rules, use shielded interface cables.

Canada (Regulations)

This Class A digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe A est conforme à la norme NMB-003 du
Canada.

xxvi WorkCentre 6400 Service Manual

European Union

Warning
This is a Class A product. In a domestic environment, this product may
cause radio interference, in which case the user may be required to take
adequate measures.

The CE mark applied to this product symbolizes Xerox’s

declaration of conformity with the following applicable Directives
of the European Union as of the dates indicated:

December 12, 2006: Low Voltage Directive 2006/95/EC

December 15, 2004: Electromagnetic Compatibility Directive 2004/108/EC

March 9, 1999: Radio & Telecommunications Terminal Equipment Directive

1999/5/EC

This product, if used properly in accordance with the user's instructions, is

neither dangerous for the consumer nor for the environment.
To ensure compliance with European Union regulations, use shielded
interface cables.
A signed copy of the Declaration of Conformity for this product can be
obtained from Xerox.

Ozone Release

During printing operation, a small quantity of ozone is released. This amount

is not large enough to harm anyone adversely. However, be sure the room
where the product is being used has adequate ventilation, especially if you
are printing a high volume of materials, or if the product is being used
continuously over a long period.

WorkCentre 6400 Service Manual xxvii

Copy Regulations

United States

Congress, by statute, has forbidden the reproduction of the following subjects

under certain circumstances. Penalties of fine or imprisonment may be
imposed on those guilty of making such reproductions.
1. Obligations or Securities of the United States Government, such as:

Certificates of Indebtedness National Bank Currency

Coupons from Bonds Federal Reserve Bank Notes
Silver Certificates Gold Certificates
United States Bonds Treasure Notes
Federal Reserve Notes Fractional Notes
Certificates of Deposit Paper Money
Bonds and Obligations of certain agencies of the government, such as FHA, etc.
Bonds (U.S. Saving Bonds may be photocopied only for publicity purposes in connection
with the campaign for the sale of such bonds.)
Internal Revenue Stamps. If it is necessary to reproduce a legal document on which there
is a canceled revenue stamp, this may be done provided the reproduction of the
document is performed for lawful purposes.
Postage Stamps, canceled or uncanceled. For philatelic purposes, Postage Stamps may
be photocopied, provided the reproduction is in black and white and is less than 75% or
more than 150% of the linear dimensions of the original.
Postal Money Orders
Bills, Checks, or Draft of money drawn by or upon authorized officers of the United States.
Stamps and other representatives of value, of whatever denomination, which have been or
may be issued under any Act of Congress.

2. Adjusted Compensation Certificates for Veterans of the World Wars.

3. Obligations or Securities of any Foreign Government, Bank, or
Corporation.
4. Copyrighted materials, unless permission of the copyright owner has
been obtained or the reproduction falls within the “fair use” or library
reproduction rights provisions of the copyright law. Further information of
these provisions may be obtained from the Copyright Office, Library of
Congress, Washington, D.C. 20559. Ask for Circular R21.
5. Certificate of Citizenship or Naturalization. Foreign Naturalization
Certificates may be photocopied.
6. Passports. Foreign Passports may be photocopied.
7. Immigration papers.
8. Draft Registration Cards.
9. Selective Service Induction papers that bear any of the following
Registrant’s information:
■ Earnings or Income
■ Court Record
■ Physical or mental condition

xxviii WorkCentre 6400 Service Manual

■ Dependency Status

■ Previous military service

Exception: United States military discharge certificates may be

photocopied.

10. Badges, Identification Cards, Passes, or Insignia carried by military

personnel, or by members of the various Federal Departments, such as
FBI, Treasure, etc. (Unless photograph is ordered by the head of such
department or bureau.)

Reproducing the following is also prohibited in certain states:

■ Automobile Licenses

■ Driver’s Licenses

■ Automobile Certificates of Title

The above list is not all inclusive, and no liability is assumed for its
completeness or accuracy. In case of doubt, consult your attorney.

Canada

Parliament, by stature, has forbidden the reproduction of the following

subjects under certain circumstances. Penalties of fine or imprisonment may
be imposed on those guilty of making such reproduction.

1. Current bank notes or current paper money.

2. Obligations or securities of a government or bank.

3. Exchequer bill paper or revenue paper.

4. The public seal of Canada or of a province, or the seal of a public body or
authority in Canada, or of a court of law.

5. Proclamations, orders, regulations or appointments, or notices thereof

(with intent to falsely cause same to purport to have been printed by the
Queens Printer for Canada, or the equivalent printer for a province).

6. Marks, brands, seals, wrappers or designs used by or on behalf of the

Government of Canada or of a province, the government of a state other
than Canada or a department, board, Commission or agency established
by the Government of Canada or of a province or of a government of a
state other than Canada.

7. Impressed or adhesive stamps used for the purpose of revenue by the

Government of Canada or of a province or by the government of a state
other than Canada.

8. Documents, registers or record kept by public officials charged with the

duty of making or issuing certified copies thereof, where the copy falsely
purports to be a certified copy thereof.
9. Copyrighted material or trademarks of any manner or kind without the
consent of the copyright or trademark owner.
The above list is provided for your convenience and assistance, but it is not
all-inclusive, and no liability is assumed for its completeness or accuracy. In
case of doubt, consult your solicitor.

WorkCentre 6400 Service Manual xxix

Other Countries

Copying certain documents may be illegal in your country. Penalties of fine or

imprisonment may be imposed on those found guilty of making such
reproductions.

■ Currency notes

■ Bank notes and cheques

■ Bank and government bonds and securities

■ Passports and identification cards

■ Copyright material or trademarks without the consent of the owner

■ Postage stamps and other negotiable instruments

This list is not inclusive and no liability is assumed for either its completeness
or accuracy. In case doubts, contact your legal counsel.

xxx WorkCentre 6400 Service Manual

Fax Regulations

United States

Fax Send Header Requirements

The Telephone Consumer Protection Act of 1991 makes it unlawful for any
person to use a computer or other electronic device, including a fax machine,
to send any message unless such message clearly contains in a margin at the
top or bottom of each transmitted page or on the first page of the
transmission, the date and time it is sent and an identification of the business
or other entity, or other individual sending the message and the telephone
number of the sending machine or such business, other entity or individual.
The telephone number provided may not be a 900 number or any other
number for which charges exceed local or long distance transmission
charges.
In order to program this information into your machine, refer to customer
documentation and follow the steps provided.

Data Coupler Information

This equipment complies with Part 68 of the FCC rules and the requirements
adopted by the Administrative Council for Terminal Attachments (ACTA). On
the cover of this equipment is a label that contains, among other information,
a product identifier in the format US:AAAEQ##TXXXX. If requested, this
number must be provided to the telephone company.
A plug and jack used to connect this equipment to the premises wiring and
telephone network must comply with the applicable FCC Part 68 rules and
requirements adopted by the ACTA. A compliant telephone cord and modular
plug is provided with this product. It is designed to be connected to a
compatible modular jack that is also compliant. See installation instructions for
details.
You may safely connect the machine to the following standard modular jack:
USOC RJ-11C using the compliant telephone line cord (with modular plugs)
provided with the installation kit. See installation instructions for details.
The Ringer Equivalence Number (REN) is used to determine the number of
devices that may be connected to a telephone line. Excessive RENs on a
telephone line may result in the devices not ringing in response to an
incoming call. In most but not all areas, the sum of RENs should not exceed
five (5.0). To be certain of the number of devices that may be connected to a
line, as determined by the total RENs, contact the local telephone company.
For products approved after July 23, 2001, the REN for this product is part of
the product identifier that has the format US:AAAEQ##TXXXX. The digits
represented by ## are the REN without a decimal point (e.g, 03 is a REN of
0.3). For earlier products, the REN is separately shown on the label.
To order the correct service from the local telephone company, please provide
the Facility Interface Code (FIC) and Service Order Code (SOC) listed below:
FIC: 02LS2
SOC: 9.0Y

WorkCentre 6400 Service Manual xxxi

You may also have to provide the USOC Jack code and the Ringer
Equivalence Number (REN).

If this Xerox equipment causes harm to the telephone network, the telephone
company will notify you in advance that temporary discontinuance of service
may be required. But if advance notice is not practical, the telephone
company will notify the customer as soon as possible. Also, you will be
advised of your rights to file a complaint with the FCC if you believe it is
necessary.

The telephone company may make changes in its facilities, equipment,

operations or procedures that could affect the operation of the equipment. If
this happens, the telephone company will provide advance notice in order for
you to make necessary modifications to maintain uninterrupted service.

If trouble is experienced with this Xerox equipment, for repair or warranty

information, please contact the appropriate service center; details of which
are displayed either on the machine or contained within the User Guide. If the
equipment is causing harm to the telephone network, the telephone company
may request that you disconnect the equipment until the problem is resolved.

Repairs to the machine should be made only by a Xerox Service

Representative or an authorized Xerox Service Provider. This applies at any
time during or after the service warranty period. If unauthorized repair is
performed, the remainder of the warranty period is null and void. The
equipment must not be used on party lines. Connection to party line service is
subject to state tariffs. Contact the state public utility commission, public
service commission or corporation commission for information.

If your office has specially wired alarm equipment connected to the telephone
line, make sure that the installation of the Xerox equipment does not disable
your alarm equipment.

If you have any question about what will disable alarm equipment, consult
your telephone company or a qualified installer.

Canada

Note
The Industry Canada label identifies certified equipment. This certification
means that the equipment meets certain telecommunications network
protective, operational and safety requirements as prescribed in the
appropriate Terminal Equipment Technical Requirements document(s).
The Department does not guarantee the equipment will operate to the
user’s satisfaction.

Before installing this equipment, users must make sure that it is permissible to
be connected to the facilities of the local telecommunications company. The
equipment must also be installed using an acceptable method of connection.
The customer should be aware that compliance with the above conditions
may not prevent degradation of service in some situations.

Repairs to certified equipment should be coordinated by a representative

designated by the supplier. Any repairs or alterations made by the user to this
equipment, or equipment malfunctions, may give the telecommunications
company cause to request the user to disconnect the equipment.

xxxii WorkCentre 6400 Service Manual

Users should make sure their own protection that the electrical ground
connections of the power utility, telephone lines and internal metallic water
pipe systems, if present, are connected together. This precaution may be
particularly important in rural areas.

Caution
User should not attempt to make such connections themselves, but
should contact the appropriate electric inspection authority, or electrician,
as appropriate.

The Ringer Equivalence Number (REN) assigned to each terminal device

provides an indication of the maximum number of terminals allowed to be
connected to a telephone interface. The termination on an interface may
consist of any combination of devices subject only to the requirements that
the sum of the Ringer Equivalent Numbers of all of the devices does not
exceed 5. For the Canadian REN value, please see the label on the
equipment.

Europe

Radio Equipment & Telecommunications Terminal Equipment Directive

The Facsimile has been approved in accordance with the Council Decision
1999/5/EC for pan-European single terminal connection to the public switched
telephone network (PSTN). However, due to differences between the
individual PSTNs provided in different countries, the approval does not, of
itself, give an unconditional assurance of successful operation on every PSTN
network terminal point.
In the event of a problem you should contact your authorized local dealer in
the first instance.
This product has been tested to and is compliant with TBR21, a specification
for terminal equipment for use on analogue-switched telephone networks in
the European Economic Area. This product provides an user-adjustable
setting of the country code. Refer to the customer documentation for this
procedure. Country codes should be set prior to connecting this product to the
network.

Note
Although this product can use either loop disconnect (pulse) or DTMF
(tone) signaling, it is recommended that it is set to use DTMF signaling.
DTMF signaling provides reliable and faster call setup. Modification of this
product, connection to external control software or to external control
apparatus not authorized by Xerox, will invalidate its certification.

WorkCentre 6400 Service Manual xxxiii

New Zealand Telecom Warning Notice

1. The grant of a Telepermit for any item of terminal equipment indicates

only that Telecom has accepted that the item complies with minimum
conditions for connection to its network. It indicates no endorsement of
the product by Telecom, nor does it provide any sort of warranty. Above
all, it provides no assurance that any item will work correctly in all
respects with another item of Telepermitted equipment of a different make
or model, nor does it imply that any product is compatible with all of
Telecom’s network services.
The equipment may not be capable of correct operation at the higher data
speeds designated. 33.6 kbps and 56 kbps connections are likely to be
restricted to lower bit rates when connected to some PSTN
implementations. Telecom will accept no responsibility should difficulties
arise in such circumstances.

2. Immediately disconnect this equipment should it become physical

damaged, and arrange for its disposal or repair.
3. This modem shall not be used in any manner which could constitute a
nuisance to other Telecom customers.
4. This device is equipped with pulse dialing, while the Telecom standard is
DTMF tone dialing. There is no guarantee that Telecom lines will always
continue to support pulse dialing.
5. Use of pulse dialing, when this equipment is connected to the same line
other equipment, may give rise to ‘bell tinkle’ or noise and may also cause
a false answer condition. Should such problems occur, the user should
NOT contact the Telecom Fault Service.
6. The preferred method of dialing is to use DTMF tones, as this is faster
than pulse (decadic) dialing and is readily available on almost all New
Zealand telephone exchanges.
7. Warning Notice: No ‘111’ or other calls can be made from this device
during a main power failure.
8. This equipment may not provide for the effective hand-over of a call to
another device connected to the same line.
9. Some parameters required for compliance with Telecom’s Telepermit
requirements are dependent on the equipment (PC) associated with this
device. The associated shall be set to operate within the following limits
for compliance with Telecom’s Specifications:
For repeat calls to the same number:

■ There shall be no more than 10 call attempts to the same number

within any 30 minute period for any single manual call initiation, and

■ The equipment shall go on-hook for a period of not less than 30

seconds between the end of one attempt and the beginning of the
next attempt.

For automatic calls to different numbers:

■ The equipment shall be set to ensure that automatic calls to different

numbers are spaced such that there is no less than 5 seconds
between the end of one call attempt and the beginning of another.

10. For correct operation, total of the RN’s of all devices connected to a single
line at any time should not exceed 5.

xxxiv WorkCentre 6400 Service Manual

General Information
In this chapter...
■ Printer Introduction and Overview
■ Printer Configurations
■ Parts of the Printer
■ Printer Options
■ Maintenance and Consumable Items
■ Specifications
■ Toner Cartridge Life
■ Maintenance Function
■ Controller Functions
■ Information Pages and Reports

Chapter
1
General Information

Printer Introduction and Overview

The Xerox WorkCentre 6400 combines a color laser print engine, a Scanner,
Copier, and Fax. The WorkCentre 6400 has a single-pass color laser-design
architecture, which offers color and mono print speed at 32/37-ppm, copy and
scan resolutions at to 600 x 600 dots-per-inch (dpi), while can achieve print
resolutions up to 2400 x 2400 dpi. The printer supports Adobe PostScript 3
and PCL6, USB 2.0, and 10/100/1000 Base-TX Ethernet. The Scanner
supports Scan to Desktop, Scan to Public Folder, Network Scan to FTP, and
Network Scan to E-Mail using touch-screen UI with resolution up to 600 dpi.
The WorkCentre 6400 provides a standard 500-Sheet Tray and a 100-Sheet
Fold Down Tray. Tray 1 supports specialty paper, card stock, and envelopes.
The standard paper input is 600 sheets and the maximum input with an
optional Trays 3 and Tray 4 is 1600 sheets. The Output Tray holds 500 sheets
facedown.
The Document Feeder is a 2-pass Duplex Automatic Document Feeder
(DADF) with automatic de-skew capability, and supports 50-sheet capacity.
The printer options add paper capacity and functionality.

■ Two 500-Sheet Feeders are available as options.

■ A Staple Finisher is available as optional or standard configuration.

■ Wireless Network Adapter

Technical Support Information

The Xerox WorkCentre 6400 Service Manual is the primary document used
for repairing, maintaining, and troubleshooting the printer.
To ensure complete understanding of this product, participation in Xerox
WorkCentre 6400 Service Training is strongly recommended. To service this
product, Xerox certification for this product is required.
For updates to the Service Manual, Service Bulletins, knowledge base, etc.,
go to:

■ Xerox Global Service Net - https://www.xrxgsn.com/secure/main.pl

■ Service Partners: http://www.office.xerox.com/partners

For further technical support, contact your assigned Xerox Technical Support
for this product.
To help us improve our service documentation, please complete the survey
located at:
http://www.surveymonkey.com/s.aspx?sm=jzeKkEF_2fhVgDRUktu_2brNWQ_3d_3d

1-2 WorkCentre 6400 Service Manual

General Information

Printer Configurations

The WorkCentre 6400 is available in three configurations.

Features Printer Configurations

6400 S 6400 X 6400 XF

Processor and Clock Speed 800 MHz 800 MHz 800 MHz
Memory Configuration* 1 GB 1 GB 1 GB
Print Speed (Color/Mono) (ppm) 32/37 32/37 32/37
Adobe PostScript 3 Fonts Standard Standard Standard
PCL6 Fonts Standard Standard Standard
USB 2.0 Hi-Speed Support Standard Standard Standard
Ethernet Interface 10/100/1000 10/100/1000 10/100/1000
Base-TX Base-TX Base-TX
Tray 1 (100 Sheet) Standard Standard Standard
Tray 2 (500 Sheet) Standard Standard Standard
Tray 3 500-Sheet Feeder Optional Optional Standard
Tray 4 500-Sheet Feeder Optional Optional Standard
Duplex Unit Standard Standard Standard
Fax N/A Standard Standard
600-Sheet Finisher Optional Optional Standard
Printer Stand Optional Optional Standard
Foreign Device Interface Optional Optional Optional
Wireless LAN Optional Optional Optional
Printer Resolutions (dpi)
■ Standard ■ 1200 x 600 ■ 1200 x 600 ■ 1200 x 600
■ Enhanced ■ 2400 x 600 ■ 2400 x 600 ■ 2400 x 600
Copy Resolutions (dpi)
■ Color Resolutions ■ 600 x 600 ■ 600 x 600 ■ 600 x 600
■ Mono Resolutions ■ 600 x 600 ■ 600 x 600 ■ 600 x 600
Scan Resolutions (dpi)
■ From Document Glass ■ 600 x 600 ■ 600 x 600 ■ 600 x 600
■ From DADF ■ 600 x 300 ■ 600 x 300 ■ 600 x 300

* All configurations have one memory slot supporting 512 MB/ 1 GB DDR2 DIMMs, to a maximum of
2.0 GB total.

WorkCentre 6400 Service Manual 1-3

General Information

Parts of the Printer

Front and Side Views

7 5
6 4
3
2
8
1

10
11
12
13

15 17

s6400mfp-512

1. Tray 1 10. Staple Cover

(Finisher Front Door)

2. Duplex Unit 11. Scanner Latch

3. Input Tray 12. Front Door

4. Paper Guides 13. Tray 2

5. ADF Cover 14. Tray 3 (optional)

6. Control Panel 15. Tray 4 (optional)

7. Finisher Top Tray 16. Printer Stand (optional)

8. Finisher Main Tray 17. Optional Sheet Feeder Lower

Right Door

9. Finisher Assembly (option)

1-4 WorkCentre 6400 Service Manual

General Information

Rear View

3
5 4 2 s6400mfp-513

1. Power Switch

2. Power Cord Connection

3. USB Connection

4. Telephone Line

5. Foreign Device Interface Connection

6. Ethernet Connection

7. USB Memory Slot (Service Use Only)

8. Scanner Connection

WorkCentre 6400 Service Manual 1-5

General Information

Internal Components

2 1
4

5 Y

6 s6400mfp-514

1. Transfer Roller

2. Transfer Belt
3. Fuser

4. Toner Cartridge (x4)

5. Imaging Unit (x4)

6. Waste Cartridge

Finisher

s6400mfp-515

1-6 WorkCentre 6400 Service Manual

General Information

Scanner

2 1

5
4
6

s6400mfp-516

1. Automatic Document Feeder Tray

2. Automatic Document Feeder

3. Document Glass
4. Scanner Lock Lever

5. Output Tray

6. Control Panel

WorkCentre 6400 Service Manual 1-7

General Information

Hard Disk Drives

The WorkCentre 6400 includes two Hard Disk Drives. In addition to storing
firmware, space is available for additional features such as fonts/forms/
macros. Each Hard Drive has an 80 GB capacity.

Note
The Hard Drives are labeled NC (Network Controller) and CC (Copy
Controller). The NC Hard Drive is on top of the stack.

CC
s6400mfp-736

Duplex Unit

The Duplex Unit is a standard feature for the WorkCentre 6400. User can
install or remove the Duplex Unit without using any tools.

s6400mfp-203

1-8 WorkCentre 6400 Service Manual

General Information

Control Panel Configurations

The Control Panel consists of one LED, one 8 inch Wide Video Graphics Array
(WVGA) touch screen display, and 25 functional buttons. These buttons are
used to navigate the menu system, perform functions, and select modes of
operation for the printer, scanner, copier, and fax.

Service Control Panel Access

Function Buttons Pressed

Enter Service Diagnostics “*” then + “#” then + “Stop” buttons

Service Copy Mode “*” + “#” + “Stop” buttons
Control Panel Calibration “Dial Pause” + “*” + “#” buttons

LED Indicators

LED State Printer State

Flashing Green First Level Power Save mode

Green Second Level Power Save mode (Deep Sleep)
Note: The LED is not illuminated when processing jobs.

WorkCentre 6400 Service Manual 1-9

General Information

Control Panel Button Description

The Control Panel functions are segregated into three sections.

■ Center Panel

■ Left Side
■ Right Side

English
Log In/Out Help

Services Home
ABC DEF
1 2 3 Clear All
GHI JKL MNO
Features 4 5 6 Interrupt
PRS TUV WXY Printing

7 8 9
Job Status
Dial Pause
0 # Stop

Machine Status
*
// C Start
Language

International
?

ABC DEF
1 2 3 CA
GHI JKL MNO
4 5 6
PRS TUV WXY
7 8 9
i

0 #
i
*
// C

s6400mfp-473

1-10 WorkCentre 6400 Service Manual

General Information

Control Panel - Left Side

The left side of the Control Panel contains the Services Home, Features, Job
Status, Machine Status, and Language buttons.

Services Home

Features

Job Status i

Machine Status i
Language

s6400mfp-518

Service Home – Press to return to the home page of the Control Panel display.
Note: Service Home button is programmable.
Features – Press to access the features (such as copy, scan, and fax) on the
Control Panel display.
Job Status – Press to view the list of active and completed jobs on the Control
Panel display.
Machine Status – Press to view the supplies status, printer information, and
access the Menu Map and information pages. The Administrator can change the
printer settings using the Machine Status button.
Language – Press to change the Control Panel language and keyboard settings.

WorkCentre 6400 Service Manual 1-11

General Information

Control Panel - Right Side

The right side of the Control Panel contains the Power Save LED, Numeric
buttons, Log In/Out, Help, Clear All, Interrupt Printing, Stop, and Start buttons.

Alphanumeric
Keypad Power Save LED
Log In/Out Help ?

ABC DEF ABC DEF

1 2 3 Clear All 1 2 3 CA
GHI JKL MNO GHI JKL MNO
4 5 6 Interrupt 4 5 6
PRS TUV WXY Printing PRS TUV WXY
7 8 9 7 8 9
Dial Pause
0 # Stop 0 #
* *
// C Start // C

s6400mfp-519

Alphanumeric Keys – Use to enter numbers and letters for name and phone
numbers.
Log In/Out – To access protected features. Press this button to enter the user
name and password using the touch screen. To log out, press this button again.
Help – Press to view a help message about the current selection on the Control
Panel display.
Power Save LED– This light is On in Power Save mode and blinks when the
printer is receiving a print job.
Clear All – Press once to return to the default main menu. This feature deletes
numeric values or the last digit entered.
Interrupt Printing – Press to pause a print job. Press this button again to resume
printing. This button does not pause copy, scan, or fax job.
Stop – Press to interrupt a print, copy, scan, or fax job. If more than one type of
job is in process, select the job to cancel on the Control Panel display.
Start – Press to start a copy, scan, or fax job.

1-12 WorkCentre 6400 Service Manual

General Information

Printer Options

WorkCentre 6400 Multifunction printer options include:

■ Fax

■ Printer Stand
■ Optional 500-Sheet Feeder (Tray 3 and Tray 4)

■ Finisher

■ Foreign Device Interface

Fax

Fax feature is available for specific WorkCentre 6400 configurations. Available

features include:

■ Walk-up Fax

■ Server Fax Support

■ LanFax (Print-to-fax), PCL only

Printer Stand

The Printer Stand is available in the WorkCentre 6400 XF configuration as a

standard model. The Print Stand height can be adjusted by the user from 320
mm to 395 mm.

s6400mfp-529

WorkCentre 6400 Service Manual 1-13

General Information

Optional 500-Sheet Feeder Unit (Tray 3 and Tray 4)

The Optional 500-Sheet Feeder increases input capacity of the printer and
can be attached to the printer underneath Tray 2. The Optional 500-Sheet
Feeder is customer installable.

Note
The WorkCentre 6400 can support up to 2 Optional 500-Sheet Feeder
Units.

s6400mfp-521

1-14 WorkCentre 6400 Service Manual

General Information

Finisher

The Finisher is a customer install option which includes the following features:
■ Set and Offset Stacking

■ Paper Capacity:

■ Top Tray (Sub Tray): 100 sheets

■ Bottom Tray (Main Tray): 500 sheets

■ Sort-Staple: Maximum 30 sheets, corner staple

■ Normal Mode: 30 sheets

■ Cover Mode: 28 sheets

■ Non-Staple: no offset, sort, and set

■ Staple Cartridge Capacity: 5,000 staples

2 3

1
s6400mfp-242

1. Main Tray Section

2. Top Tray Section

3. Top Tray Transport Section

4. Storage Section

5. Staple Section

WorkCentre 6400 Service Manual 1-15

General Information

Foreign Device Interface

The Foreign Device Interface (FDI) cable provides the capability to connect an
external device such as Coin Operation device to the printer.

s6400mfp-667

s6400mfp-737

1-16 WorkCentre 6400 Service Manual

General Information

Maintenance and Consumable Items

A consumable or maintenance item is a Multifunction Printer part or assembly

that has a limited life, and requires periodic replacement. Routine
maintenance items are typically customer replaceable.
Each Toner Cartridge has a CRUM (Customer Replaceable Unit Meter) to
record new or used cartridge and usage information and identifies the type of
Toner Cartridge (Standard or High capacity).

Note
Black Toner Cartridge is only available in High capacity.

The CRUM contains a company ID, Region ID, and Xerox company name. A
CRUM counts the amount of remaining toner. When toner empty is detected,
Life End status will be sent to indicate toner empty.
Internal counters track Consumables and Maintenance Items life usage.
Life ratings are based on A-size sheets at 5% coverage and on “typical” office
printing per color on 24 lb. paper.
The following listed items have limited life and require periodic replacement.

Note
The life rating will be affected by the temperature and humidity by the
operating environment (refer to “Environment Specifications” on
page 1-24). To meet the life rating as shown in the table below, a stable
environment is required.
WorkCentre 6400 Maintenance and Consumable Items

Item Description Print Life/ Quantity

1 Toner Cartridge
Standard Capacity ■ Color: 8,000 pages
■ Black: Only available in High Capacity
High Capacity ■ Color: 16,500 pages
■ Black: 12,000 pages
2 Imaging Unit Up to 30,000 pages (5-page jobs, or more,
simplex, plain paper)
3 Waste Cartridge ■ Color: Up to 9,000 pages at 5% coverage
■ Mono: Up to 36,000 pages at 5% coverage
4 Fuser Unit ■ Up to 150,000 pages (continuous)
■ Up to 130,000 pages (2-page jobs)
5 Transfer Roller Up to 120,000 pages
6 Transfer Belt Up to 120,000 pages
7 Ozone Filter Up to 120,000 pages
(bundles with Transfer Roller)
8 DADF Feed Roller Kit Up to 100,000 pages
Tray 1 Feed Roller Up to 120,000 pages
Tray 2 Feed Roller Up to 120,000 pages

WorkCentre 6400 Service Manual 1-17

General Information

WorkCentre 6400 Maintenance and Consumable Items (continued)

Item Description Print Life/ Quantity

500-Optional Sheet Feeder 240,000 pages
Feed Roller
Staple Cartridge 15,000 (3 packs of 5,000)

6 8

7 4

5
s6400mfp-452

Tray 1 Feed Roller

C-Clip Clutch Feed Roller

s6400mfp-354

Tray 2 Feed Roller

Feed Roller
K-Clip

s6400mfp-346

1-18 WorkCentre 6400 Service Manual

General Information

Specifications

Printer Specifications

Characteristic Specifications

Printing Technology Printing System: Four-Tandem electro-photographic system

using Image Transfer Belt (Corona charging system with
comb electrode)
Development: Non-magnetic, mono-component, Jumping
development method
Toner: Chemical Toner: Black, Yellow, Magenta, and Cyan
Exposure System: 4 LD and 1 Polygon mirror
Semiconductor laser beam scanning system
Fusing System: Thermal belt fusing with pressure (2
Heating Lamps: 700/300 Watts)
Printer Life 400,000 pages (Color: Mono = 1:1)
Print Volume Average: 4,500 PV/month
Maximum Duty Cycle 120,000 pages/month*
Color Medium Cyan, Magenta, Yellow, and Black Toner Cartridges
Print-Quality Mode 1200 x 600 (Standard)
2400 x 600 (Enhanced)
Maximum Image 240% for all C, M, Y, K combined
Coverage
Warm-Up Time From Power On: 4.5 minutes
Operating System Windows 2000/ 2003 Server/XP/ Vista
Macintosh OS 10.3 or higher, Intel Mac
Linux Redhat, SuSe, and TurboLinux 10
Desktop
* Assumes a 30 day month of printing.

WorkCentre 6400 Service Manual 1-19

General Information

Scanning Specifications

Characteristic Specifications

Scanning Technology Type: Flatbed Color CCD Scanner

Optical Resolution:
■ 600 x 600 dpi (Document Glass)

■ 600 x 300 dpi (DADF)

Document Size: Max Legal Size

Scanning Mode ■ Document Glass: Document fixed flatbed scanning
■ DADF: Carriage fixed, document feeding scanning (dual
pass)
Maximum Scanning ■ Document Glass Mode: 215.9 mm x 355.6 mm
Size (8.5 in. x 14 in.)
■ DADF Mode: 215.9 mm x 355.6 mm (8.5 in. x 14 in.)
Paper Size
■ Minimum ■ Fast Scan Direction: 148 mm (5.8 in.)
■ Slow Scan Direction; 210 mm (8.3 in.)
■ Maximum ■ Fast Scan Direction: 215.9 mm (8.5 in.)
■ Slow Scan Direction: 355.6 mm (14.0 in.)
UI Scan Settings
Resolution Up to 600 dpi
Color Mode Color, Black & White
Original Type Text, Photo, Mixed
File Format JPEG, PDF, TIFF, Multipage TIFF, Searchable PDF
Lighter/Darker 7 levels
Sharpness 3 levels
Contrast 3 levels
Auto Exposure Off, Normal, Higher (1, 2)
Supported Scan ■ Scan to Mailbox
Destinations ■ Scan to Email
■ Scan to File
■ Scan to Home

Scan Performance

Color/Mono Specifications

Letter Speed A4 Speed

mm/sec (ipm) mm/sec (ipm)

Scan Reading Speed Mono 207.4 (35 ipm) 207.4 (33.1 ipm)
from DADF - Simplex
Color 162.2 (30 ipm) 162.2 (28.5 ipm)
(600 x 300 dpi)

1-20 WorkCentre 6400 Service Manual

General Information

Scan Performance (continued)

Color/Mono Specifications

Letter Speed A4 Speed

mm/sec (ipm) mm/sec (ipm)

Scan Reading Speed Mono 207.4 (16.9 ipm) 207.4 (16.5 ipm)
from DADF - Duplex
Color 162.2 (15.4 ipm) 162.2 (15 ipm)
(600 x 300 dpi)
Scan Reading Speed Mono 105.83 105.83
from Platen
Color 81.88 81.88
(600 x 600 dpi)

Copy Specifications

Characteristic Specifications

Resolution ■ Scan at: 600 x 600 dpi

■ Output at: 600 x 600 dpi
Quantity 1 to 999
Input/Output 1:1, 1:2, 2:2, 2:1
Document Scanner DADF with 50-sheet capacity
Copy Features & ■ Collation
Options ■ Automatic 2-sided/Duplex
■ Stapling (up to 30 sheets)
■ Large Job Interrupt
■ Auto Paper Select
■ Authentication for Services (i.e., Color Copy)
■ Auto Tray Switching
Image Quality Image Quality
Features ■ Original Type: Photo & Text, Text, Photo, Map, Newspaper,
Magazine
■ Image Options: Lighten/Darken, Sharpness, Saturation

■ Image Enhancement: Auto Background Suppression, Auto

and Manual Contrast
■ Color Presets: Off, Lively, Bright, Warm, Cool

■ Color Balance: Normal, Basic Color, Advanced Color

Reduce/Enlarge 25% ~ 400% in 1% increment

Lighter/Darker 7 levels
Color Saturation 3 levels
Sharpness 3 levels
Auto Exposure Off, Normal, Higher (1, 2)
Multiple Up (N to 1) Off, Auto, Manual
Duplex Copy On, Off
Auto Fit On, Off
Cloning On, Off

WorkCentre 6400 Service Manual 1-21

General Information

Copy Performance

Requirements: Copy mode: default settings, copy output on plain paper,

simplex original, simplex copy output, with environmental conditions between
15°C and 32°C and absolute humidity less than 20g/m3.
Rate specified is maximum continuous throughput rate and does not include
scanner reading time or image processing time.

Copy Speed

Color/Mono Specifications

Letter Speed (cpm) A4 Speed (cpm)

Copy Speed from DADF - Simplex

Multiple originals - max Mono 35 33.1

throughput
Color 30 28.5
1-original, N-Up copies - Mono 37 37
max throughput
Color 31.7 31.7

Copy Speed from DADF - Duplex

Multiple originals - max Mono 16.9 16.5

throughput
Color 15.4 15
1-original, N-Up copies - Mono 22.5 22.5
max throughput
Color 19.4 19.4

Copy Speed from DADF - Platen (one original, multiple copies)

1-original, N-Up copies - Mono 37 37

max throughput
Color 31.7 31.7

1-22 WorkCentre 6400 Service Manual

General Information

Fax Specifications

Characteristic Specifications

Type ECM/ Super G3

Modem Speed V.34 (up to 33.6k bps)
TX Speed 3 sec./ page (at V.34)
Scan Resolution ■ Standard: 200 x 100 dpi
■ Fine: 200 x 200 dpi
■ Superfine: 300 x 300 dpi
Original Type Text, Photo, Mixed
Compression MH, MR, MMR
Image Quality ■ Image Options: Lighten/Darken, Sharpness
Features ■ Image Enhancement: Background Suppression, Auto and
Manual Contrast
Fax Features ■ Secure Fax
■ Mailbox and Polling
■ Delayed Sending (up to 24 hours)
■ Junk Fax Filter
■ Speed Dials (up to 200)
■ Group Dials

Memory Specifications

Characteristic Specifications

Memory Minimum 1.0 GB

■ 512 Copy Controller

■ 512 Network Controller

Maximum 2.0 GB
Supported RAM ■ Supports up to 2.0 GB of DDR2 DIMM with two slots
for 512 MB/ 1 GB
■ Specification: 1GB, 200-PIN SO-DIMM; 128M X
64BIT, PC2-5300, 667MHZ

WorkCentre 6400 Service Manual 1-23

General Information

Environment Specifications

Characteristic Specifications

Temperature

Operating 10° to 30° C (50° to 86° F)

Storage -20° to 40° C (-4° to 104° F)
Optimal 15° to 25° C (59° to 77° F)

Humidity (% RH)
Operating 20 to 85% RH (non-condensing)
Storage 10% to 95% (non-condensing)
Optimal 35% to 70%

Altitude

Operating 0 to 2,500 meters (8,000 feet)

Sound Power Sound Pressure

Acoustic Noise Level (Bels) (Decibels)

Standard Configuration

Standby 4.9 LWA(B) 37.99 LWAD (A)

Printing Full Speed 6.99 LWA (B) 56.78 LWAD (A)
High Speed 6.77 LWA (B) 55.16 LWAD (A)
Copying Full Speed 7.14 LWA (B) 58.24 LWAD (A)
High Speed 7.01 LWA (B) 56.86 LWAD (A)

Full Option with Finisher

Standby 4.9 LWA(B) 37.99 LWAD (A)

Printing Full Speed 7.19 LWA (B) 58.96 LWAD (A)
High Speed 6.99 LWA (B) 56.63 LWAD (A)
Copying Full Speed 7.22 LWA (B) 59.95 LWAD (A)
High Speed 7.12 LWA (B) 57.68 LWAD (A)

1-24 WorkCentre 6400 Service Manual

General Information

Electrical Specifications

Characteristic Specifications

Power Supply Voltage/

Frequency AC 110 V AC 220 V

Voltage 120 VAC ± 10% 220-240 VAC ± 10%

Frequency 50/60 Hz ± 3 Hz 50/60 Hz ± 3 Hz
Current 13.2A 7.5A

Power Consumption AC 110 V AC 220 V

Running Mode ■ Average: 900 W ■ Average: 900 W
■ Max: 1500 W ■ Max: 1500 W
Ready Mode (Fuser On) ■ Average: 250 W ■ Average: 250 W
■ Max: 1400 W ■ Max: 1400 W
Standby Mode (Semi-Sleep) Average: 32 W Average: 32 W
(Fuser Off)
Sleep Mode (Deep Sleep) Average: 28 W Average: 28 W

In-rush Current

Within 10 msec ■ Less than 50 Amp ± 10% (Cold start)

■ 160 Amp ± 10% (Hot start)

Leakage Current Power Current

120 V < 3.5 mA (UL)

220-240 V < 3.5 mA (IEC)

WorkCentre 6400 Service Manual 1-25

General Information

Print Speed

Simplex (ppm)

Requirements: Printing in Standard Mode (1200 x 600) with environmental

conditions between 15°C and 32°C and absolute humidity less than 20g/m3.
The 1-hour continuous rate is 90% of the maximum rate.

Color/ Specifications (ppm)

Media Type Mono Letter Speed A4 Speed Legal Speed

Max 1-Hour Max 1-Hour Max 1-Hour
Continuous Continuous Continuous
Plain Mono 37 33.3 35 31.5 30 27
Color 31.7 28.5 30 27 25.5 22.9
Recycled Mono 37 33.3 35 31.5 30 27
Color 31.7 28.5 30 27 25.5 22.9
Heavyweight Mono 16 14.4 12.6 11.3 --- ---
Color 16 14.4 12.6 11.3 --- ---
Extra Mono 12 10.8 10 9 --- ---
Heavyweight Color 12 10.8 10 9 --- ---
Gloss Mono 16 14.4 12.6 11.3 --- ---
Coating Color 16 14.4 12.6 11.3 --- ---
Heavyweight Mono 10 9.0 10 9 --- ---
Gloss Color 10 9.0 10 9 --- ---
Coating
Transparency Mono 9 8.1 9 8.1 --- ---
Color 9 8.1 9 8.1 --- ---

Duplex (ppm)

Requirements: printing in Standard Mode (1200 x 600) with environmental

conditions between 15°C and 32°C and absolute humidity less than 20g/m3.
The 1-hour continuous rate is 90% of the maximum rate.

Color/ Specifications (ppm)

Media Type Mono Letter Speed A4 Speed Legal Speed

Max 1-Hour Max 1-Hour Max 1-Hour
Continuous Continuous Continuous
Plain Mono 22.5 20.3 22.5 20.3 15 13.5
Color 19.4 17.5 19.4 17.5 13 11.7
Recycled Mono 22.5 20.3 22.5 20.3 15 13.5
Color 19.4 17.5 19.4 17.5 13 11.7
Heavyweight Mono 6.2 5.6 6.2 5.6 --- ---
Color 6.2 5.6 6.2 5.6 --- ---

1-26 WorkCentre 6400 Service Manual

General Information

Warm-Up Time

Warm-up time is defined as the time from a power-off or a sleep condition, to

a ready to print/ copy condition, and is measured in ambient temperature
23°C and at nominal line voltage for both 120V and 240V models.

Warm-Up Time

Description Time (seconds)

Without process control Less than 45 sec.

With Color Registration Control 45 sec. (average)
With short process control (simple correction / 45 sec. (average)
image stabilization)
With long process control (full correction / 91 sec. (average)
image stabilization)

First Print Output Time

From Sleep Mode

The Engine first print out time (FPOT) is defined as the time from initiation of
print engine activities (when the system controller sends the Print Command)
to the complete exit of the sheet from the machine output rolls of the output
tray (without finisher).
The following condition is applied:

■ Printing in Standard Mode (1200 x 600), simplex, with environmental

conditions between 15°C and 32°C and absolute humidity less than 20g/
m3.

Mode FPOT (sec.)

From Sleep 62 sec.

Applies to Plain paper, Color
S2 process speed = 185 mm/sec, Simplex

WorkCentre 6400 Service Manual 1-27

General Information

From Ready Mode

The following condition is applied:

■ Printing in Standard Mode (1200 x 600), simplex, with environmental

conditions between 15°C and 32°C and absolute humidity less than 20g/
m3.

Color/
Specifications
Media Type Mono

Simplex
The Engine first print out time (FPOT) is defined as the time from initiation of print
engine activities (when the system controller sends the Print Command) to the
complete exit of the sheet from the machine output rolls of the output tray (without
finisher).
A4 A5 B5 Letter Legal
8.5 x 11
Plain Mono 15 15 15 15 16.5
Color 16 16 16 16 16.5
Recycled Mono 15 15 15 15 16.5
Color 16 16 16 16 16.5
Heavyweight Mono 22 --- --- 22 ---
Color 25 --- --- 25 ---
Extra Mono 22 --- --- 22 ---
Heavyweight Color 25 --- --- 25 ---
Gloss Coating Mono 23 --- --- 23 ---
Color 25 --- --- 25 ---
Heavyweight Mono 29 --- --- 29 ---
Gloss Coating Color 29 --- --- 29 ---
Transparency Mono 22 --- --- 22 ---
Color 25 --- --- 25 ---
Duplex
The Engine first print out time (FPOT) is defined as the time from initiation of print
engine activities (when print engine is in the “Ready” state and the system controller
sends the Print Command) to the complete exit of the sheet from the machine output
rolls of the output tray (without finisher).
A4 A5 B5 Letter Legal
8.5 x 11
Plain Mono 22 --- 22 22 23
Color 24 --- 24 24 25
Recycled Mono 22 --- 22 22 23
Color 24 --- 24 24 25
Heavyweight Mono 44 --- 44 44 45
Color 48 --- 48 48 49

1-28 WorkCentre 6400 Service Manual

General Information

First Copy Output Time

First Copy Output Time (FCOT) is defined when a document is placed on the
machine in Ready condition and the Start button is pressed until the trail edge
of the first copied output passes the exit rollers.
The following conditions applied:

■ Default Copy settings

FCOT Color/Mono Reference

With scanner Without scanner

shading correction shading correction
(sec) (sec)

DADF – Simplex Mono 21 17

Color 22 18
Platen Mono 21 17
Color 22 18

WorkCentre 6400 Service Manual 1-29

General Information

Physical Dimensions and Clearances

Printer Dimensions

Print Engine 6400 S 6400 X 6400 SX

Width 32.0 in. 32.0 in. 39.7 in.

(812 mm) (812 mm) (1008 mm)
Depth 23.1 in. 23.1 in. 23.1 in.
(588 mm) (588 mm) (588 mm)
Height 24.7 in. 24.7 in. 44.9 in.
(627 mm) (627 mm) (1166 mm)
Weight 130.0 lb. 130.0 lb. 181.0 lb.
(59.0 kg) (59.0 kg) (82.0 kg)

Options

500-Sheet Feeder (Optional)

Width 17.6 in. (448.0 mm)

Depth 20.5 in. (520.7 mm)
Height 4.3 in. (109.9 mm)
Weight 13.4 lb. (6.1 kg)

Finisher (Optional)

Width 18.8 in. (478.0 mm)

Depth 18.1 in. (461.0 mm)
Height 14.0 in. (355.6 mm)
Weight 21.6 lb. (9.8 kg)

Print Cart (Optional)

Width 22.8 in. (578.0 mm)

Depth 20.8 in. (529.0 mm)
Height 15.3 in. (389.0 mm)
Weight 64.0 lb. (29.0 kg)

1-30 WorkCentre 6400 Service Manual

General Information

Mounting Surface Specifications

These specifications apply to any printer used as a table-top printer.

1. In order to function properly, the printer must be placed on a surface with
the following minimum dimensions.

10.2 cm 96.5 cm
(4 in.) (38 in.)
38 cm
(15 in.) 38 cm
(15 in.)

68.6 cm
(27 in.)
32.3 cm 129.5 cm
(12.7 in.) (51 in.) s6400mfp-450

150 cm
(59 in.)

43.3 cm 22 cm
(19 in.) (8.6 in.)
11 cm
(4.3 in.)

32 cm*
(12.6 in.*)

*7.5 cm
(3 in.)
129.5 cm
(51 in.) 39.5 cm
78 cm (15.6 in.)
(31 in.)

s6400mfp-451

WorkCentre 6400 Service Manual 1-31

General Information

2. Mounting surface flatness must be within the specified range.

5 mm (0.2 in.) Max

s6400mfp-522

3. The printer must not be tipped or tilted more than 7 mm.

10° or 7 mm
(0.27 in.)

10° or 7 mm
(0.27 in.) s6400mfp-523

Failure to adhere to the specified mounting specifications will void all

guarantees of print-quality and/or performance. Known problems that can
occur as a result of exceeding the mounting surface specifications are:

■ Color-to-Color mis-registration, primarily in the horizontal (laser scan)

direction.

■ A smear or line of toner approximately 40 mm from the trailing edge of the

print.

1-32 WorkCentre 6400 Service Manual

General Information

Paper and Tray Specifications

The following tables list the recommended Xerox paper for the WorkCentre
6400.

Supported Paper Size

Paper Type Dimension Tray 1 Tray 2 Trays 3, 4

Letter 8.5 x 11 in. Yes Yes Yes

Legal 8.5 x 14 in. Yes No Yes
Statement 5.5 x 8.5 in Yes No No
Executive 7.25 x 10.5 in. Yes No Yes
A4 210 x 297 mm Yes Yes Yes
A5 148 x 210 mm Yes No No
B5 182 x 257 mm Yes No No
Custom 92 x 148 mm Yes No No

Supported Paper Types and Weights

Paper Type Paper Weight Tray 1 Tray 2 Trays 3, 4

Plain 60-90 g/m2 Yes Yes Yes

(16-24 lb. Bond)
Hole Punched 60-90 g/m2 Yes Yes Yes
(16-24 lb. Bond)
Pre-Printed 60-90 g/m2 Yes Yes Yes
(16-24 lb. Bond)
Recycled 60-90 g/m2 Yes Yes Yes
(16-24 lb. Bond)
Letter Head 60-90 g/m2 Yes Yes Yes
(16-24 lb. Bond)
Heavy Weight 91-150 g/m2 Yes No No
(24-40 lb. Bond)
Extra Heavy Weight 151-210 g/m2 Yes No No
(41-78 lb. Bond)
Gloss 100-128 g/m2 Yes No No
(68-86 lb. Text)
Heavyweight Gloss 128-210 g/m2 Yes No No
(58-78 lb. Cover)
Transparency * ----- Yes No No
Label ** ----- Yes No No
* Use only recommended Xerox transparencies. Other transparencies may damage
the printer.
** Do no print on both sides of label media.

WorkCentre 6400 Service Manual 1-33

General Information

Supported Envelopes

Type Dimension Tray 1 Tray 2 Trays 3, 4

C5 Envelope 162 x 229 mm Yes No No
C6 Envelope 114 x 162 mm Yes No No
DL Envelope 110 x 220 mm Yes No No
Monarch Envelope 3.87 x 7.5 in. Yes No No
#10 Commercial 4.12 x 9.5 in. Yes No No
Envelope
Note:
■ Do not use envelopes with hot melt glue, windows, or metal clasps. Some
wrinkling and embossing may occur.
■ The Paper Tips embedded page lists the most commonly used papers.

■ To minimize wrinkling and embossing, be sure to se the Gray dials on the Fuser to
the Envelope position.
■ Be sure to set the Grey dial at the Fuser area to Envelope setting.

1-34 WorkCentre 6400 Service Manual

General Information

Toner Cartridge Life

Toner Cartridge Life Information

Toner
Control Panel Display Functionality
Cartridge

Life Warning Error End of Life Error

Xerox Re-order Toner Toner is empty. Prints with full
Cartridge, but do Replace it now. functionality.
not replace until
prompted.
Xerox Will not print.
(refill Toner
Cartridge)
Non-Xerox If the printer is configured
(3rd Party) as 3rd Party, two options
are available at the Control
Panel.
Printer displays options
“Use It” or “Do not use it.”
A non-Xerox Toner
Cartridge warning message
is displayed if “Use It”
option is selected.

Maintenance Function

Firmware Update

The WorkCentre 6400 updates engine, Scanner, Copy Controller, Network

Controller (contained on the Hard Drives) and Finisher software.
Refer to “Firmware Update” on page A-2 in Appendix A.

Diagnostics

Two types of diagnostic functions are available:

1. Power-On Self Test (POST) performed during power up. Refer to “Power
On Self Test (POST)” on page 4-4 for a detailed description of
components checked.
2. Manual Diagnostics: Only qualified service personnel can perform manual
diagnostics using the Service Mode in the Control Panel.

WorkCentre 6400 Service Manual 1-35

General Information

Controller Functions

Capture, Print, Save, and Reprint

The Capture, Print, Save, and Reprint (CPSR) feature allows the user to scan
hard-copy documents as an electronic file and place the file into a folder
located on the printer.
The Capture Print Save Reprint (CPSR) feature provides the capability to
extend Print, Copy, and Scan Export features, such as that those jobs
submission will result in the file or job being stored locally on the printer.
The stored jobs can be retrieved at a later date for output as many times as
the user needs. If required, the user can specify that the job only be stored,
and no printed output will be created at the time the job is stored.

Contention Management

The Contention Management feature allows the System Administrator to set

the two different methods: First In First Out (FIFO) or Priority. These methods
determine the order in which jobs contending for a printer resource can obtain
the resource.

■ FIFO: When FIFO management is specified, a printer resource is

acquired on a first-come-first-served basis. When a new job requires the
resource, it is added to the bottom of the resource’s job queue.

■ Priority: When Priority management is specified, a printer resource is

acquired on a job priority basis. Jobs are categorized by job type.

Interrupt Printing

Interrupt Printing feature suspends printing, which allows the user at the
printer to submit a copy job. The user will be able to submit a copy job that will
take precedence over other jobs in the queue, including suspended job. Once
the Interrupt button is pressed again, the suspended job will continue, along
with other queue jobs.

■ Interrupt Page Boundaries: The printer will stop interrupted job(s) per
items listed:

■ Marking/Finishing: Next available page of the printer controller to halt.

■ Scanning: After scanning is completed.
■ Image Processing: At the next convenient boundary determined by
the printer controller.

■ Interrupt Mode: Current job in the queue will be halted at the next
available page once the Interrupt button is pressed. The printer stays in
this mode when an Interrupt button is pressed or the Job Programming
Time Out timer expires. Copy jobs that are submitted when Interrupt
Mode is selected will have priority over all queued jobs including halted
jobs.

1-36 WorkCentre 6400 Service Manual

General Information

■ Normal Operation: There are no immediate impacts on any ongoing

scanning or image processing. Any ongoing scanning job must be
completed before an interrupt job can be started. There is only one level
of interrupt; interrupt job cannot be interrupted by another job.

■ Exiting Interrupt Mode: Interrupt Mode can be exited by pressing the

Interrupt button, or the Job Programming Time Out timer expires. When
the Interrupt Mode is exited, any marking/finishing that was interrupted
will automatically resume.

■ Interrupt and Platform Resynchronization: The printer will not

remember the current Interrupt Mode across shutdowns or resets.

Job Priority Setup

The priority of jobs can be assigned from 1 (highest priority) to 16 (lowest

priority). Multiple job types can have the same priority. The job priority setup
must be saved across system resets.
The printer always accepts the local input (scanning) of a job as soon as
possible regardless of the assigned priority of the job type. Possible delays of
scan include:

■ Adequate space is not available in EPC memory

■ Scanner calibration is in progress

■ A single print job is in progress

■ The printer is in Service Diagnostics mode

Secure Print

The Secure Print option is available within the Client Print Driver and the web
UI. The Secure Print feature protects sensitive or private data by only allowing
the print job to be printed when the user releases the job.
When the print job is submitted, it remains in the print queue. The user must
enter the valid password which is validated against the password that was
entered when the job was submitted. Refer to the User Guide for additional
information.

WorkCentre 6400 Service Manual 1-37

General Information

Workflow Scanning

Workflow Scanning allows the user to scan an original document, convert the
document to an electronic file, distribute, and archive the file in a variety of
ways. The final destination of the electronic file depends on the template
chosen by the user at the printer’s User Interface. The template may reside on
the printer, or may be cached on the printer from a pool of templates pulled
from a remote server. The scanned file will be stored on a pre-determined
network server and then, with the help of the server or desktop software:

■ Routed to a user’s PC desktop for viewing or editing.

■ Integrated with a variety of popular document management and workflow

applications.

■ Sent to a network directory or filing location for later retrieval.

■ Sent to an e-mail distribution list.

1-38 WorkCentre 6400 Service Manual

General Information

Information Pages and Reports

The following Information Pages and Reports are available in the WorkCentre
6400 printer. Various Information Pages can be accessed through Customer
login or Service Diagnostics.

Information Pages

■ Configuration Report

■ Connection Setup Page

■ Paper Tips Page

■ Supplies Usage Page

■ Usage Profile

■ Copying Guide

■ Scanning Guide

■ Faxing Guide

■ Office Demo Page

■ Graphics Demo Page

■ 2-Sided Demo Page

■ CMYK Sampler Pages

■ RGB Sampler Pages

■ Spot Color Sampler Pages

■ PCL Font List

■ PostScript Font List

Configuration Report

The Configuration Report is a two-sided page which contains the

configuration settings and information.

Connection Setup Page

The Connection Setup Page is a multiple page document. The pages contain
information on connection types (i.e., USB and Ethernet), procedures for
setting up connection for various operating systems, and an overview of
hardware connections.

Paper Tips Page

The Paper Tips Page contains general guidelines on the type of media,
description of tray setup,

WorkCentre 6400 Service Manual 1-39

General Information

Reports

■ Copy Activity Report

■ Fax Confirmation Report

■ Fax Acknowledgement Report

■ Broadcast & Multipoll Report

■ Fax Activity Report

■ Fax Protocol Report

■ Fax Dial Directory Report

■ Fax Group Directory Report

■ Fax Options Report

■ Fax Pending Jobs Report

Copy Activity Report

The Copy Activity Report contains a summary report per copy session. Once
enabled, the report will count the successful images marked by the system for
the pertaining copy session. Sessions will be confirmed completed via a GUI
popup, asking the user to confirm a continued or complete session. Once the
user has confirmed a completed session, the system will submit the report for
all images successfully marked and finished by the system (DC or ST).

Fax Confirmation Report

The Fax Confirmation Report provides information on the success or failure of

the fax jobs.

Fax Acknowledgement Report

The Fax Acknowledgement Report contains the recipient’s acknowledgement

information after a fax job is completed.

Broadcast & Multipoll Report

The Broadcast and Multipoll Report is the transmission report generated

when the send list has multiple recipients

Fax Activity Report

The Fax Activity Report contains information including sent to transmissions

and received from transmissions. Auto Print feature can be set up for the Fax
Activity Report, which prints a Fax Activity Report after 50 fax jobs.

1-40 WorkCentre 6400 Service Manual

General Information

Fax Protocol Report

The Fax Protocol Report contains the protocol information about the last fax
whether it was a send or receive job.
Refer to “Internal Page Samples” on page A-142 for Fax Protocol Report
example.

Fax Dial Directory Report

The Fax Dial Directory Report contains the individual directory telephone
numbers which are programmed in to the Individual Directory. The Fax Dial
Directory Report is printed in groups of 50.

Fax Group Directory Report

The Fax Group Directory Report contains the group fax numbers which are
programmed to a single location for serial broadcast transmission of
documents. This feature is also known as Group ID.

Fax Options Report

The Options Report contains parameters and settings information.

Fax Pending Job Report

The Fax Pending Job Report contains all communication jobs reserved in
memory.

Support Pages

The Support Pages provide accessible hardcopy material for setting up and
diagnosing purposes. Refer to Chapter 5 - Print-Quality Troubleshooting
Pages and Test Patterns.

■ Cyan 50% Fill

■ Magenta 50% Fill

■ Yellow 50% Fill

■ Black 50% Fill

■ Registration Print

■ Delta-E Print

■ Ghosting Print

WorkCentre 6400 Service Manual 1-41

General Information

1-42 WorkCentre 6400 Service Manual

Theory of Operation
In this chapter...
■ Table of Contents
■ WorkCentre 6400 Operational Overview
■ Major Assemblies and Functions
■ Image Creation, Transfer, and Fixing
■ Paper Path of the Printer
■ Image Input Terminal
■ Image Output Terminal
■ Fan Assemblies
■ Duplex Unit
■ Optional 500-Sheet Feeder
■ Finisher

Chapter
2
Theory of Operation

Table of Contents

WorkCentre 6400 Operational Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Major Assemblies and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Image Creation, Transfer, and Fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Paper Path of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Paper Path Route. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Image Input Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Duplex Automatic Document Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Scanner Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Image Output Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Electrical Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Laser Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Toner Cartridge and Level Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Waste Toner Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Imaging Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
Developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49
Ozone Ventilation Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
Transfer Belt (1st Image Transfer). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54
Transfer Roller (2nd Image Transfer Roller) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60
Paper Feed (Tray 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65
Paper Feed (Tray 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71
IDC Sensor (Density Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78
Registration Roller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81
Fusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-89
Horizontal Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-97
Image Quality Control (Image Stabilization) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-101
Fan Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104
Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-105
Duplex Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-106
Duplex Reverse Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-106
Paper Transport and Duplex Paper Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-107
Duplex 2-Sided Printing Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-108
Optional 500-Sheet Feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-113
Drive Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-113
Paper Feed Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-114
Finisher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-121
Paper Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122
Paper Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-123
Top Tray Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-126
Main Tray Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-129
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-131
Main Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-142
Stapling Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-147

2-2 WorkCentre 6400 Service Manual

Theory of Operation

WorkCentre 6400 Operational Overview

The WorkCentre 6400 is a single-pass color laser Multifunction Printer that

uses Raster Output Scanner (ROS) lasers with an electrophotographic four-
color CMYK process.
The tandem system consists of four color toner cartridges (C, M, Y, and K)
which creates the toner image. The WorkCentre 6400 offers Print, Scan,
Copy, and Fax functionalities.

System Overview

The WorkCentre 6400 is divided into two main components: the Image Input
Terminal (IIT - Scanner) and the Image Output Terminal (IOT - Print Engine).
The WorkCentre 6400 consists of the DADF Assembly, Scanner Assembly,
Control Panel, Print Engine, Duplex Unit, Optional 500-Sheet Feeders, and
Finisher.

Control Panel
DADF Assembly
Scanner Assembly
Finisher

Image
Input
Terminal

Image
Y M C K Output
Terminal

Y M C K
Print
Engine

Duplex Unit Optional

500-Sheet
Feeders
s6400mfp-092

WorkCentre 6400 Service Manual 2-3

Theory of Operation

The following diagram contains the major operating components and their
basic connection.

Document Finisher Lower

Feeder Scanner Unit
Feeder Unit

Image Processor Board Engine Control Board

Duplex Unit
Image
Processing Paper Feed
and Transport
Fax CC CPU
NC
Board
Process

Fusing
Laser Unit

TC: Toner Cartridge

TC/Y TC/M TC/C TC/K IU/Y IU/M IU/C IU/K
IU: Imaging Unit

Control System Line

Image Bus Line

s6400mfp-095

2-4 WorkCentre 6400 Service Manual

Theory of Operation

Major Assemblies and Functions

Major functional components for the printer are classified into the following
categories based on the printer configuration.

■ “Image Creation, Transfer, and Fixing” on page 2-6

■ “Paper Path of the Printer” on page 2-7

■ “Duplex Automatic Document Feeder” on page 2-8

■ “Scanner Assembly” on page 2-15

■ “Electrical Components” on page 2-19

■ “Laser Unit” on page 2-25

■ “Toner Cartridge and Level Detection” on page 2-29

■ “Waste Toner Collection” on page 2-37

■ “Imaging Unit” on page 2-44

■ “Photo Conductor” on page 2-45

■ “Charge Corona” on page 2-48

■ “Developer” on page 2-49

■ “Transfer Belt (1st Image Transfer)” on page 2-54

■ “Transfer Roller (2nd Image Transfer Roller)” on page 2-60

■ “Paper Feed (Tray 1)” on page 2-65

■ “Paper Feed (Tray 2)” on page 2-71

■ “IDC Sensor (Density Control)” on page 2-78

■ “Registration Roller” on page 2-81

■ “Fusing” on page 2-89

■ “Horizontal Transport” on page 2-97

■ “Paper Exit” on page 2-99

■ “Fan Assemblies” on page 2-104

■ “Duplex Unit” on page 2-106

■ “Optional 500-Sheet Feeder” on page 2-113

■ “Finisher” on page 2-121

WorkCentre 6400 Service Manual 2-5

Theory of Operation

Image Creation, Transfer, and Fixing

The following diagram provides the sequence of events for the xerographic
process of the WorkCentre 6400.

10 Paper Separation
7 2nd Image Transfer

8 Transfer Belt
Cleaning

6 1st Image Transfer

2 Photo 9 Photo Conductor 11 Fusing

Conductor Drum Cleaning
5 Developing Drum
3 Photo Conductor Drum Charging

1 Printing Process 4 Laser Diode Exposure s6400mfp-632

The WorkCentre 6400 print process consists of the following steps:

1. Printing Process: The intensity of the laser light is controlled based on
the image signal transmitted from the host computer or Scanner
Assembly.
2. Photo Conductor (PC) Drum: The image of the original projected on to
the surface of the PC Drum is changed to a corresponding electrostatic
latent image.
3. Photo Conductor Drum Charging: Applies negative DC charge to the
Photo Conductor.
4. Laser Diode (LD) Exposure: Laser beams are emitted from the Laser
Diode to form an electrostatic latent image on the paper.
5. Developing: Toner, agitated and negatively charged in the toner
chamber, is attracted onto the electrostatic latent image formed on the
surface of the PC Drum, which then changed to a visible, developed
image.
6. 1st Image Transfer: A positive DC voltage is applied to the backside of
the Transfer Belt, which allows the visible, developed image on the
surface of each of the PC Drums (Y, M, C, and K) to be transferred onto
the Transfer Belt.
7. 2nd Image Transfer: A positive DC voltage is applied to the backside of
the paper, which allows the visible, developed image on the surface of the
Transfer Belt to be transferred onto the paper.
8. Transfer Belt Cleaning: The residual toner left on the surface of the
Transfer Belt is scraped off.
9. Photo Conductor Drum Cleaning: The residual toner left on the surface
of the PC Drum is scraped off.
10. Paper Separation: Paper, which has went through the 2nd Image
Transfer process, is neutralized so that it can be properly separated from
the Transfer Belt.
11. Fusing: The Fuser affixes toner onto paper using heat and pressure.

2-6 WorkCentre 6400 Service Manual

Theory of Operation

Paper Path of the Printer

Paper Path Route

The paper is supplied from Tray 1, Tray 2, or optional Tray 3/4 and is
transported upward into the printer along the paper path through the Vertical
Transport section.
After passing through the image transfer and fusing process, the paper is fed
through the Horizontal Transport section, then to the output tray or Finisher.
In Duplex mode, data is first printed on the back side of the paper.
After fusing process, the paper is reversed and fed into the Duplex Unit. It is
then fed back into the main paper path from the Duplex Unit and goes through
the print process for the front side.

1-Sided Paper Path

1-Sided Paper Path from Tray 1

2-Sided Paper Path

s6400mfp-093

WorkCentre 6400 Service Manual 2-7

Theory of Operation

Image Input Terminal

The IIT generates the image data for copies and scans and is made up of two
major subsystems:

■ Duplex Automatic Document Feeder (DADF)

■ Scanner Assembly with the Control Panel

Duplex Automatic Document Feeder

The DADF is capable of automatically feeding original documents from the

input tray.

DADF Assembly DADF Input Tray

DADF Hinges

Lamp

CVT Window

Control Panel

Platen/Document Glass DADF Connector

s6400mfp-872

2-8 WorkCentre 6400 Service Manual

Theory of Operation

DADF Sensors, Roller, and Pads

DADF Pick Roller Sensor

Separator Roller Assembly

Jam Detect Sensor

DADF Top Cover Open Sensor

Separator Pads

Paper Detect Sensor s6400mfp-871

DADF Paper Legal Length Sensor (PS6)

Switchback Solenoid Relay Board 2

Transport Document Feeder
Motor (M1) Control Board

Registration
Clutch
Relay Board 1 s6400mfp-650

Paper Pick Mechanism

The Paper In Sensor (PS4) detects originals that have been properly loaded
in the Document Feeder. The Document Stopper establishes the leading edge
position of the document loaded in the Document Feeder. The Stopper is
lowered in Standby state and raised when the document is picked up and fed
in.
The Document Stopper is raised and lowered in synchronization with the
raising and lowering motion of the Pick-Up Roller. The Pick-Up Roller and
Feed Roller turn to pick up and feed the original properly.
The Pick-Up Roller transports the original up to the Feed Roller. The
Transport Motor drives the Pick-Up Roller and Feed Roller through a gear
train, the Pick-Up Solenoid (SL1), and the Pick-Up Clutch.

Reverse Solenoid
Transport Motor (M1)

Pickup Solenoid

Exit Sensor

Pickup Sensor

Pickup Roller

Feed Roller
Paper In Sensor (PS4)
Document Stopper s6400mfp-651

2-12 WorkCentre 6400 Service Manual

Theory of Operation

Document Separation Mechanism

Multi-picks of paper is prevented using friction between the Feed Roller and
Separator Pad.

Feed Roller

Separator Pad
Document Stopper
s6400mfp-652

Document Transport Mechanism

The original that has been picked up blocks the Paper Feed Sensor (PS4).
The Transport Roller turns to transport the original up to the document
scanning position of the IIT. The Transport Motor (M1) drives the Transport
Roller through a gear train.

Paper In Sensor (PS4)

Transport Motor (M1)

Registration Rollers s6400mfp-653

WorkCentre 6400 Service Manual 2-13

Theory of Operation

Transfer Mechanism for 2nd Side Scan/Paper Exit

The original transferred from the Transport section will be re-fed or exit by the
Exit Roller and the Exit Reverse Roller. The Exit Reverse Roller is driven by
the Transport Motor.

Transport Motor (M1)

Registration Rollers

Exit Reverse Roller

Exit Roller
s6400mfp-654

Calibration

Automatic DADF Calibration

Note
Refer to “dc608 - Document Feeder Registration” on page 6-11 to check
the registration of the Document Feeder.

2-14 WorkCentre 6400 Service Manual

Theory of Operation

Scanner Assembly

Scanner Assembly Functions

Scanner Assembly Components

Components Description

Document Glass or The document glass is used for copying or scanning original
Platen documents and images.
Scan Head and The flatbed portion of the IIT contains a moveable scan head
Lamp that includes the CCD imaging board, main control board,
drive motor, and lamp assembly. The lamps are Cold Cathode
Fluorescent lamps.
CVT Window This portion of the document glass is a part of the DADF paper
path. The principal function of this window is to allow the scan
head to image an original being fed through the DADF.
IIT Connector An electrical connection on the rear of the flatbed portion of
the IIT connects to a receptacle on the IOT completing the
signal path for image data from the IIT, power to the IIT, and
system communications between the three components.
Control Panel The Control Panel is the user interface with the printer.

Open/ Close Mechanism

The Scanner Unit Open/ Close mechanism prevents the Scanner Unit from
being opened or closed with the DADF Assembly in its raised position.
The Scanner Unit can be opened only if the DADF Assembly is in its lowered
position.

DADF Assembly Interlock

s6400mfp-634

WorkCentre 6400 Service Manual 2-15

Theory of Operation

Lowering the DADF Assembly pushes the lever on the backside of the
Scanner Assembly down. This causes the lever on the inside of the printer to
slide to the front side, which disengages the Lock Pawl.

Lever

Lock Pawl

Linkage Arm Open/Close Lever

s6400mfp-636

Opening and Closing the Scanner Assembly

The Scanner Assembly Open/ Close Lever on the front of the main body is
used to open or close the Scanner Assembly in order to access the Horizontal
Transport section on the paper path.

Scanner Unit Open/Close Lever

s6400mfp-637

2-16 WorkCentre 6400 Service Manual

Theory of Operation

Interior Parts of the Scanner Assembly

Scanner Motor
Exposure Unit

Scanner Home Sensor s6400mfp-878

Scanner Calibration

Automatic Scanner Calibration

1. The lamps turn on.

2. The scan head drives toward the automatic calibration target to ensure
that the head lock is released.
3. The scan head moves back to the home position flag, out, and back to
confirm the operation.
4. The scan head moves under the calibration target until the CCD achieves
a specified image quality and stability.
5. The scan head moves toward the document glass to confirm motion
control.
6. The scan head moves back to the home position under the CVT window.

WorkCentre 6400 Service Manual 2-17

Theory of Operation

Manual Scanner Calibration

Manual calibration is a maintenance procedure accessed through the Control

Panel. Scanner calibration requires the calibration sheet provided with a
replacement Scanner Assembly or DADF Assembly. It is designed to ensure
the DADF and scan heads are aligned to the system (motion control), the
scan heads are aligned to one another (duplex scanning alignment), and that
certain white, black, and gray scale calibrations are performed. This
calibration is performed:

■ At the factory during initial system setup.

■ Whenever the DADF or Scanner Assembly, or both, are replaced (refer

“Scanner Calibration” on page 6-23).

■ If troubleshooting determines that the paper being fed into the DADF is
skewed.

Note
Refer to “dc609 - Document Glass Registration” on page 6-11 to check
the registration of the Document Glass and correct any misalignments or
skew.

2-18 WorkCentre 6400 Service Manual

Theory of Operation

Image Output Terminal

Electrical Components

Image Processor Board

The Image Processor Board (I/P) utilizes 2 processors each with it’s own
dedicated hard drive, one for the Copy Controller (CC) and one for the
Network Controller (NC). The I/P Board interfaces directly with the Engine
Controller, Control Panel, Fax, and Scanner.

Network Controller Hard Drive Connection

NVRAM Chip
RAM RAM

SATA Board

Copy Controller
Hard Drive
Connection

NVM Module FAX Board

s6400mfp-873

WorkCentre 6400 Service Manual 2-19

Theory of Operation

Copy Controller

The Copy Controller (CC) software manages the system and establishes
communications with the other platforms. Software compatibility checks are
performed to confirm that all platforms are running compatible software, and,
if not, the software upgrade process will be started. The steps that the CC
software performs include:
1. At power-on, the CC performs its boot initialization routines.
2. After the CC operating system has been loaded, communications
between the CC and other components begin.
a. The CC to IOT interface is implemented using full-duplex UART
communication over an RS422 connection.
b. The scanner communicates to the CC via a serial interface using
AVCDI proxy. There is no direct communication between the CC and
the DADF. The scanner reports whether the DADF is present.
c. The CC communicates to the NC. At power-on, the CC and NC boot
separately and synchronize with each other when both are ready.
d. The CC communicates to the Fax and detects the presence or
absence of Fax at power-on.
e. The CC communicates to the User Interface (UI). The UI cannot
display reliably until the XML User Interface (XUI) application software
is finished loading the NC processor.
3. Power-on initialization begins when communications have been
established between the core modules (Copy Controller, Network
Controller, IOT, and IIT). The CC verifies communication with the printer’s
configuration and capabilities, which includes the following detections:
■ Finisher presence, identification, and capabilities
■ Foreign Interface Device (FID) presence
■ Hard Drives presence
■ Any additional memory installed
4. The CC requests initialization to other components during power-on
following platform synchronization with the CC.
a. IOT - The CC requests the IOT to provide its configuration and
capabilities information.
b. UI - There are no new CC controlled initialization requirements for the
UI touch screen display.
c. Image Input Terminal (IIT) - Scanner calibration is available in both
Customer mode and Service mode. There is a limited mechanical
initialization. The scan head moves away from Home position and
back during power-up.
The CC initially raise a status (03-557) during boot to indicate that the
Scanner is not ready. The status will be removed when the Scanner is
ready.
d. NC - There are no NC controlled initialization requirements for the
NC. The real time clock resides on the NC, and upon power-up, the
CC gets its time from the NC.
e. Fax - At power-on, the CC determines if fax is installed or not. If fax is
installed, checks are performed to determine the version of the fax
service.
f. Finisher - The Finisher informs a check of its capabilities upon
request from the CC.

2-20 WorkCentre 6400 Service Manual

Theory of Operation

Miscellaneous Copy Controller Power-On Tasks

When all installation and software upgrade tasks are completed, the printer
reboots and completes its power-on sequence. The CC declares the printer
state as ready to scan, copy, print, and fax (depending on the printer’s
configuration).

Note
The software upgrade only happens when “Auto Upgrade” is turned On in
CWIS.

Image Output Terminal

a. The IOT power-on comprises a Power-on Self Test (POST), which

ensures that hardware resources are available to run the operating
system.
■ The appropriate LED blinks on the I/P Board.
When the IOT boots successfully and is ready for communications, it
raises the engine Ready signal. This signal indicates that the engine has
initialized properly.
b. The IOT communicates to the CC. Once the IOT has acknowledged
the CC initialization request, the update of capability and
configuration information can begin. If the IOT detects a
communication error to the CC, it will wait until requested to reset by
the CC.

User Interface

The User Interface (UI) does not contain a microprocessor to generate the UI
screen. The screen images are generated by the I/P Board and sent to the UI
display using four Low-Voltage Differential Signalings (LVDS) differential pair
video signals.
1. UI Initialization and POST - There is no power-on self test for the UI. On
system power-on, the UI indicates the system is powering by turning On
the Control Panel power LED. When initialization has completed, the
system displays the static splash screen at the earliest opportunity.
2. UI Power On Tasks - Once the NC operating system has loaded:
a. The dynamic splash screen displays within 30 seconds.
b. The UI screen indicates via dynamic splash screen activity whether
the UI has synchronized with the CC or not.
c. The feature pathway LEDs will be switched Off.
During that time that the dynamic splash screen is displayed, the GUI
displays a Copyright Notice for a minimum of 5 seconds.
The GUI displays an Energy Star logo for a minimum of 5 seconds.
After communications are fully established between the UI and NC
application software, the UI removes the Power-on sequence in
Progress message and begin accepting status display requests.

WorkCentre 6400 Service Manual 2-21

Theory of Operation

Image Input Terminal

The Image Input Terminal (IIT) comprises the Scanner and DADF. The CC
interfaces to the Scanner via a full duplex Low-Voltage Transistor Transistor
Level (LVTTL) serial interface.
1. ADF Initialization and POST - There is no initialization or POST.
2. Scanner Initialization POST and Calibration - The IIT is held in reset
until the CC communicates with the CC. Once the reset state is lifted, the
Scanner reboots, initializes, and performs a POST check.

Network Controller

Both the Network Controller (NC) and Copy Controller software reside on the
NC and CC Hard Drives, and loaded into the NC DDR memory and CC DDR
memory during system startup, and as necessary during machine operation.
1. Initialization and POST - At power-on, the NC performs its boot
initialization routines, which include hardware initialization tasks such as
CPU, FPGA, System RAM, and disk controller initialization.
The NC then load its operating system and attempts to synchronize with
the CC when it has finished booting successfully.
2. NC communicates to CC - If the NC has not established
communications with the CC within 5 minutes, the NC declares a fault.
3. NC communicates to UI - The controller sends commands to the UI to
set backlight brightness and turn the LED’s On or Off. The controller can
request the UI system status.
The UI panel sends data to the NC when a button is pressed, the touch
screen is touched, or when the controller requests the UI’s status. The UI
establishes communications with the UI application within 2 minutes.

Fax

1. Initialization - At power-on, the fax service performs its initialization

activities. On completion of its initialization, the fax service enters a Wait
state until a synchronization request is made by the CC.
2. POST - There is no POST activity for fax.
3. Other Fax Power-On Tasks - The fax service only goes online to accept
incoming fax jobs when requested by the CC. This process occurs
sometime during the CC boot power-on phase.
When synchronization with the CC is completed and any fax job recovery
tasks are completed, a ready to fax message is displayed on the UI.
After CC - Fax communications have been established, if the CC
determines that the fax software is incompatible with the system, a fault
and status message are displayed.

2-22 WorkCentre 6400 Service Manual

Theory of Operation

Block Diagram

Image Processing Board

HDD DDR2
Engine
Image Path MCU
Scanner
Copy Controller
Engine Video
Control
FDI

FAX
User I/O

USB2
Ethernet Print Controller

User Interface
(LCD/Keypad)

HDD DDR2
s6400mfp-874

WorkCentre 6400 Service Manual 2-23

Theory of Operation

MCU Board (Engine Control Board)

The MCU Board controls all engine functions such as printing, diagnosis, and
supplies life tracking. The MCU Board is located on the rear side of the printer.
The IOT firmware is located on the FLASH ROM, and the code can be
updated through the Main Controller via engine video interface.

Note
When replacing the MCU Board, be sure to remove the NVRAM (IC4)
from the old MCU Board and install it on the new MCU Board.

NVMRAM

s6400mfp-875

2-24 WorkCentre 6400 Service Manual

Theory of Operation

Laser Unit

The WorkCentre 6400 contains four semiconductor lasers within the Laser
Unit, one for each of the four colors (Y, M, C, and K). A single Polygon Mirror is
used to make a scan. Each Photo Conductor is irradiated with a laser light,
creating an electrostatic latent image.

1st Return Mirror

SOS Lens Separation
Mirror
G2 Lens

2nd Return Mirror

Index Board

G1 Lens

Polygon Mirror

Semiconductor Laser Synthetic Mirror

s6400mfp-026

WorkCentre 6400 Service Manual 2-25

Theory of Operation

Laser Exposure Process

1. The laser light emitted by each of the semiconductor laser (Y, M, C, and
K) is reflected onto the Polygon Mirror via a Synthetic Mirror.
2. The laser light reflected by the Polygon Mirror is reflected at a different
angle for each color.
3. The condensing angle of each color of laser light is corrected by the G1
lens before reaching each Return Mirror.
4. The K laser light is condensed on the surface of the Photo Conductor
through the Separation Mirror and G2 lens.
5. The Y, M, or C laser light is condensed on the Photo Conductor through
the Separation Mirror, G2 lens, and Return Mirror.

Index Sensor

SOS Lens

G1 lens Separation Mirror

1st Return Mirrors

Y
Polygon Mirror M
C Y
K M K
Semiconductor C
Laser
Synthetic Mirror
Photoconductor Y M C K

2nd Return Mirror

Y M C

K
G2 Lens s6400mfp-079

Laser Emission Timing

The Engine Control Board generates the Laser On signal when a ready signal
is detected, after the print cycle has been started after a given period.
The Laser On signal triggers the firing of each laser light, which illuminates
the Index Board via the Polygon Mirror, G1 lens, Separation Mirror (K), and
Start of Scan (SOS) lens. This process generates an SOS signal.

■ The SOS signal synchronizes the timing at which the laser lights are
irradiated for each scan line.

■ The SOS signal is generated only from the K laser light. For the other
colors, the emission timing is determined with reference to K.

2-26 WorkCentre 6400 Service Manual

Theory of Operation

Laser Emission (Printable) Area

/HSYNC
/VIDEO /TOD
/VIDEO
Void Width: 4mm/0.157” Void Width: 4mm/0.157”

Void Width: 4mm/0.157”

s6400mfp-090

Main Scan Direction (FD)

The print start position in the Feed Direction (FD) is determined by the Feed
Direction print start signal (HSYNC) from the Engine Control Board (MCU
Board) and the width of the paper. The laser emission area is determined by
the paper size. There is a 4 mm/0.157” wide void area on both edges of the
paper.

Sub Scan Direction (CD)

The print start position in the Cross Direction (CD) is determined by the Cross
Direction print start signal (TOD) that is output from the Engine Control Board
(MCU Board) and the length of the paper. However, there is a 4 mm/0.157”
wide void area on both edges of the paper. The laser image is determined by
the paper size. There is a 4 mm/0.157 wide void area margin on both the
leading and trailing edges of the paper.

WorkCentre 6400 Service Manual 2-27

Theory of Operation

Laser Light Intensity

The laser light intensity control corrects the target level of fluctuations in fine
line reproduction and reverse image (white on black) reproduction that occur
due to variations in photo conductor electrostatic characteristics, developing
characteristics, and transfer characteristics (part-to-part variations,
environment, durability).
Laser Intensity is controlled integrally with other control items by the image
quality control.
The laser light intensity control is performed when an image quality (image
stabilization) sequence is requested.

Registration Correction

In a tandem engine that has an image forming process for each color of toner,
incorrect color registration tends to occur due to variations in parts of the main
body used for regulating the image writing positions. The registration
correction control automatically detects and corrects any incorrect color
registration.
Registration is controlled integrally with other control items by the image
quality control.
The registration correction control is performed when an image stabilization
sequence is requested.

Note
The image quality (image stabilization) control is performed automatically
by the engine as mentioned above or can be initiated manually using the
Image Quality Calibration routine (refer to “Image Quality Calibration” on
page 6-21).

2-28 WorkCentre 6400 Service Manual

Theory of Operation

Toner Cartridge and Level Detection

There are two different types of Toner Cartridge.

■ Standard Capacity Toner Cartridge (Y/M/C): 8,000 pages.

■ High Capacity Toner Cartridge (K): 12,000 pages

■ High Capacity Toner Cartridge (Y/M/C): 16,500 pages.

Note
Black Toner Cartridge is only available in High Capacity.

s6400mfp-099

Toner Feed Mechanism

The Toner Supply Motor is turned either forward or backward to drive the
Agitating Blade or the Conveyance screw. The Agitating Blade in each
cartridge agitates and transfers toner to the Conveyance screw.
Toner transferred by the Agitating Blade is transferred to the Toner Collecting
Port located on the front side of the printer by the Conveyance screw.

CRUM
Toner Cartridge
Agitating Blade

Conveyance Screw Toner Collecting Port

s6400mfp-100

WorkCentre 6400 Service Manual 2-29

Theory of Operation

Toner Supply Motor (C/K) (M7) Front View of

Toner Cartridge
Toner Supply
Motor (Y/M) (M6) Conveyance Screw

Toner Cartridges

Agitator Blade

s6400mfp-032

Rear View of Toner Cartridge

Agitating Blade Conveyance Screw

s6400mfp-101

2-30 WorkCentre 6400 Service Manual

Theory of Operation

Toner Collecting Port Shutter Mechanism

The Toner Collecting Port is equipped with a shutter mechanism that prevents
toner from being spilled when the Toner Cartridge is removed from the printer.
After installing the Toner Cartridge in the printer, placing the Imaging Unit
Release Lever in its locked position opens the shutter of the Toner Collecting
Port, which allows toner to transfer to the Imaging Unit. Moving the Imaging
Unit Release Lever to the right or left allows the Shutter to open or close.

Release Lever

s6400mfp-103

When the Release Lever is in the “Locked” position, the Shutter is open,
which allows the Front Door to close.

Closed
Slider

Shutter
Open

Shutter s6400mfp-104

WorkCentre 6400 Service Manual 2-31

Theory of Operation

Toner Flow

1. Toner transferred onto the front side of the Toner Cartridge by the
Conveyance screw is transferred through the Toner Collecting Port and
then into the Imaging Unit Collecting Port.
2. Toner transferred to the Collecting Port is transferred into the Imaging
Unit’s toner chamber by the Replenishing screw.

Toner Collecting Screw

K
C
Replenishing Screw
M
Y Imaging Units
Agitating Screw s6400mfp-123

3. The toner level detection system on the front side of the Imaging Unit (the
sensor is mounted on the printer side) detects the level of toner available
in the toner chamber.
4. Toner transferred to the toner chamber is agitated (charged) by the
Replenishing screw and Agitating screw.
5. Toner transferred onto the rear side of the toner chamber is fed to the
Supply Roller.
6. Toner fed to the Supply Roller is transported onto the Developer Roller. At
this time, the 1st and 2nd Regulator Blade regulate the height of toner on
the surface of the Developer Roller.
7. Toner on the Developer Roller is fed to the electrostatic latent image
formed on the surface of the Photo Conductor.
8. The biasing charge of any toner left on the Developer Roller is neutralized
returned to the Supply Roller.
9. Toner on the surface of the Photo Conductor is transferred onto the
Transfer Belt, scraped off by the Cleaning Blade, and is transported to the
Waste Toner conveyance section by the Toner Collecting screw.

2-32 WorkCentre 6400 Service Manual

Theory of Operation

10. Toner transported by the Toner Collecting screw is stored as waste toner
in the Waste Cartridge.

Toner Collecting Port

Replenishing Screw Agitating Blade

Agitating Toner Collecting

Screw Screw

Photo Conductor
Supply Roller

Developing
Roller
s6400mfp-124

Toner Replenishing Mechanism

The Toner Supply Motor is energized according to the condition of the Toner
Level Sensor for each color of toner. Toner is then supplied from the Toner
Cartridge to the Imaging Unit as necessary.
A single Toner Supply Motor is turned either forward or backward to
accomplish supply of toner of two different colors (one motor is for Yellow and
Magenta, and the other for Cyan and Black). Magenta or Black toner cannot
be supplied while Yellow or Cyan toner is being supplied.
Toner is supplied only while the Imaging Unit is being driven. If toner is
supplied from the Toner Cartridge while the Imaging Unit remains stationary,
toner builds up at the Imaging Unit.

Direction of
Toner
Rotation (as viewed Toner Supply
Supply
from above of (Agitating Blade/Conveyance Screw)
Motor
Motor Shaft)

Y M C K

Y, M (M6) Forward (clockwise) Turned Stationary Stationary Stationary

Backward Stationary Turned Stationary Stationary
(counterclockwise)
C, K (M7) Forward (clockwise) Stationary Stationary Turned Stationary
Backward Stationary Stationary Stationary Turned
(counterclockwise)

WorkCentre 6400 Service Manual 2-33

Theory of Operation

When the motor turns forward

Toner Supply Motor Y/M (M6)

Y Y/C One-Way Clutches

s6400mfp-029

When the motor turns backward

Toner Supply Motor C/K (M7)

M
M/K One-Way Clutches

s6400mfp-030

Toner Level Detection

The toner level is determined by the accumulated time of rotation of the Toner
Supply Motor and the Toner Low Sensor Board (TLSB) that tracks the amount
of toner in each Imaging Unit. Cartridge presence and life tracking is
accomplished by the use of a CRUM within each Toner Cartridge.

2-34 WorkCentre 6400 Service Manual

Theory of Operation

Toner Near-Empty Condition Detection

Toner near-empty condition is determined when the toner level remaining in

the Toner Cartridge contains approximately 5 percent.

Toner Level Pages that can be printed after

Toner Cartridge (targeted toner near-empty detection
percent) (targeted number of pages)*

Standard Toner Cartridge: 5% Approximately 2,400 sheets

■ Color: 8,000 pages

■ Black: Only available in High

Capacity
High-Capacity Toner Cartridge: 5% Approximately 4,800 sheets
■ Color: 16,500 pages

■ Black: 12,000 pages

(*) for a standard original of a 5% coverage

Toner Empty Condition Detection

Toner Empty Condition Detection Mechanism

The Imaging Unit has a toner empty condition detecting mechanism that
detects toner empty condition based on the amount of toner transported from
the Toner Cartridge to the Imaging Unit.
The toner level in the Imaging Unit is detected by the Toner Level Sensor on
the Toner Low Sensor Board (TLSB). Light emitted from the LED travels
through the light guiding path into the Imaging Unit.
The Toner Level Sensor detects the intensity of the transmitted light through
the light guiding path from the inside of the Toner Cartridge. The toner level is
thereby estimated.

LED
Sensor

Light Guiding Path

Cleaning Sheet

Imaging Unit
s6400mfp-027

WorkCentre 6400 Service Manual 2-35

Theory of Operation

To ensure correct detection of the intensity of transmitted light by the Toner

Level Sensor, a Cleaning Sheet cleans the window in the light guiding path
periodically.

Cleaning Sheet

Imaging Unit

s6400mfp-028

Toner Empty Condition Detection Control

The printer determines that there is a toner empty condition when the Toner
Level Sensor output value remains below a specified value for a given period
of time.
Toner level information is retained even when power is turned Off. A toner
empty condition is reset when a new Toner Cartridge is detected.

2-36 WorkCentre 6400 Service Manual

Theory of Operation

Waste Toner Collection

The Waste Toner Cartridge collects waste toner from the Imaging Unit and the
Transfer Belt.

s6400mfp-142

Toner Flow at the 1st Transfer Section

1. Toner scraped off by the Cleaning Blade in each Imaging Unit is

transported to the Toner Collecting Port by the Toner Collecting screw.
2. The waste toner transported to the Toner Collecting Port is transported to
the Waste Toner Transport Unit.
3. Transported toner is carried to the Suction Transport Unit by the Transport
Roller in the Waste Toner Transport Unit.
4. Transported toner is carried to the Toner Collecting Port of the Waste
Cartridge by the Conveyance screw located in the Waste Toner Transport
Unit.
5. Transported toner is stored in the Waste Cartridge by the Conveyance
screw.

Toner Collecting Screw

Waste Toner Collecting Screw (Imaging Unit)
(Waste Toner Transport Unit)
2nd Conveyance Screw
(Waste Cartridge)

K
C
M
Y
Waste Toner Collecting Screw
(Waste Toner Transport Unit) Waste Cartridge s6400mfp-145

WorkCentre 6400 Service Manual 2-37

Theory of Operation

Waste Toner Flow at the 2nd Transfer Section

1. Toner scraped off by the Cleaning Blade is collected onto the middle of
the Transfer Belt by the Toner Collecting screw.
2. Collected toner is transported to the Waste Toner Transport Unit through
the Toner Collecting Port located in the middle of the Transfer Belt.
3. Transported toner is carried to the Toner Collecting Port of the Waste
Toner Box by the Conveyance screw located in the Waste Toner Transport
Unit.
4. Transported toner is stored in the Waste Cartridge by the Conveyance
screw.

Waste Toner Collecting Screw

(Transfer Belt Unit)

2nd Conveyance Screw

(Waste Cartridge)
Waste Toner Collecting Screw
(Waste Toner Transport Unit)
1st Conveyance Screw
(Waste Cartridge) s6400mfp-146

2-38 WorkCentre 6400 Service Manual

Theory of Operation

Waste Toner Collecting Port Shutter Mechanism

A shutter mechanism is used to prevent waste toner from being spilled from
the Toner Collecting Port when the Waste Cartridge is removed and
reinstalled. The Toner Collecting Port is closed when the Shutter Lever is in
the “Locked” position (to the rear side of the printer).
The Transfer Belt cannot be removed when the Toner Collecting Port is
opened, due to the Shutter Lever interference with the Waste Toner Transport
Unit. The Shutter Lever must be in the “Locked” position in order to remove
the Transfer Belt.
When installing the Transfer Belt, the Shutter Lever must be in the “Locked”
position so that the Shutter Lever will not interfere with the Waste Toner
Transport Unit.
To prevent the Toner Collecting Port Shutter from remaining unopened after
the Transfer Belt is installed, the Waste Cartridge must be installed, which
pushes the Shutter Lever of the Toner Collecting Port and opens the
Collecting Port.

Locked and Unlocked Positions

Shutter Lever s6400mfp-137

WorkCentre 6400 Service Manual 2-39

Theory of Operation

A dual-shutter is used to prevent waste toner from being spilled from the
Toner Collecting Port when the Waste Cartridge is removed and reinstalled.
The first Shutter of the Toner Collecting Port closes when the Lock Lever of
the Waste Cartridge is at the “Unlocked” position (9 o’clock position).

Rear View Front View Lock Lever

Lock Lever
(Unlocked Position)

Collecting Port

s6400mfp-150

First Shutter

s6400mfp-147

The second Shutter closes when the Waste Cartridge is removed.

Second Shutter

s6400mfp-148

2-40 WorkCentre 6400 Service Manual

Theory of Operation

Waste Cartridge Locking Mechanism

When the Lock Lever is in the “Locked” position (12 o’clock position), the
protrusion located in the Toner Collecting Port interferes with the printer
frame, thus preventing the Waste Cartridge from being removed.
When the Lock Lever is in the “Unlocked” position (9 o’clock position), the
Waste Cartridge can be removed.

Lock Lever

Locked
Collecting Port

Protrusion

s6400mfp-151

Waste Cartridge Locked and Position Detection Mechanisms

When the Lock Lever is in the “Unlocked” position (9 o’clock position), a

protrusion in the Front Door interferes with the Lock Lever, and prevents the
Front Door from closing.
When the Box Lock Lever is in the “Locked” position (12 o’clock position), the
Front Door can be closed.

Unlock Lock

12 O’Clock
9 O’Clock

s6400mfp-152

WorkCentre 6400 Service Manual 2-41

Theory of Operation

The Waste Cartridge Set Detection Lever detects a Waste Cartridge installed
in position. When the Waste Cartridge is not installed, the Set Detection Lever
lowers on its own weight to cover the set detection window.
The Set Detection Lever interfere with the protrusion on the Front Door,
preventing the Door from closing.
When the Waste Cartridge is installed in position, it pushes the Set Detection
Lever up, which uncovers the set detection window, allowing the Front Door to
close.

Set Detection Lever Set Detection Window

s6400mfp-153

Waste Toner Flow in the Waste Cartridge

The 1st Conveyance screw transports toner from the Toner Collecting Port to
the 2nd Conveyance screw.
The Waste Cartridge has dividing screens which allow waste toner to
accumulate from the left side.
The Agitating Blade transports waste toner from the rear end of the Toner
Cartridge up to the detection window. When waste toner blocks the Waste
Toner Full Sensor, the waste toner full condition is detected.

Top View Waste Toner Full Sensor (PS6)

Detection Window

1st Conveyance Screw

2nd Conveyance Screw Agitating Blade

Dividing Screens
s6400mfp-154

2-42 WorkCentre 6400 Service Manual

Theory of Operation

Waste Toner Near-Full Condition Detection

A waste toner near-full condition is detected when the waste toner full sensor
is continuously blocked for a specified period of time. At this time, a waste
toner near-full condition warning is displayed on the Control Panel.
Approximately 1,000 pages can be printed with use of standard originals
between a near end-of-life condition is detected and when an end of life
condition is detected.

When the Sensor is Unblocked When the Sensor is Blocked

Detection Window

Waste Toner Full Sensor (PS6) s6400mfp-155

Waste Toner Full Condition Detection

A waste toner full condition is detected when the cumulative total number of
pixels (waste toner detection dot count) exceeds a specified value after a
Waste Cartridge near-full condition has been detected. At this time, a waste
toner full fault is displayed on the Control Panel.
The printer does not accept print jobs after this message. The waste toner full
fault indication disappears when a new Waste Cartridge is installed.

WorkCentre 6400 Service Manual 2-43

Theory of Operation

Imaging Unit

The Imaging Unit contains a Photo Conductor, Cleaning Blade, and Charge
Corona, is driven by a drive mechanism within the engine. The Imaging Unit is
a customer replaceable and has print life of up to 60,000 pages (continuous)
and up to 20,000 page (2 page jobs).

s6400mfp-108

Replenishing Screw Supply Roller Photo Conductor

Cleaning Blade
Charge Corona
Toner
Collecting
Screw

Agitating Screw

Developing Roller s6400mfp-110

Imaging Unit Life Detection

The Imaging Unit life is determined based on the Photo Conductor rotating
time. Warning message appears on the Control Panel for different statuses:

■ Near Life - The Photo Conductor driving time reaches its near life run
time.

■ End of Life - The Photo Conductor driving time reaches its end of life
time.

■ Past End of Life - The Photo Conductor runs more than its life.

When the Past End of Life Fault message appears, the printer stops printing.
The message clears when the Imaging Unit is replaced.

2-44 WorkCentre 6400 Service Manual

Theory of Operation

Imaging Unit Life Control

The Imaging Unit has a CRUM that allows the engine to track Imaging Unit life
or when a new Imaging Unit is installed. When a new Imaging Unit is
detected, the engine performs an image stabilization sequence.

Photo Conductor CRUM

Developing Motor s6400mfp-109

Photo Conductor

The Photo Conductor Drum captures the latent image drawn by the laser. The
aluminum base supports the charge generating layer. The photo-conductive
material on the outside of the Drum acts as the charge transport layer.

Charge Transport Layer

Aluminum Base

Charge Generating Layer

Direction of Rotation
s6400mfp-080

WorkCentre 6400 Service Manual 2-45

Theory of Operation

Photo Conductor Drive Mechanism

The Motors are used for the drive mechanism independently of the developing
system to suppress incorrect color registration and uneven pitch.
Different motors are used to drive the color Photo Conductors and black
Photo Conductor to stop the drive for the color Toner Cartridges in
monochrome mode.
The color PC Drum Motor drives the Photo Conductor Y, M and C, while the
Intermediate Transport Motor (M1) drives the Photo Conductor K. In addition
to the Photo Conductor K, the Transport Motor (M1) also drives the Transfer
System, Paper Feed System, and Synchronizing Drive System.

Intermediate Transport Motor (M1)

Color Photo Conductor

Drum Motor (M3)

Photo Conductor
s6400mfp-115

The large diameter gears, which contain a large number of gear teeth, are
used to enhance rotating accuracy of the Photo Conductors, and suppresses
uneven pitch and pattern.
Drive energy is transmitted to each of the Photo Conductors when the
coupling on the drive end is engaged with that on the driven end.

Color Photo Conductor Intermediate Transport Motor (M1)

Drum Motor (M3)

Large
Diameter K
Gear C
M
Y

Coupling
s6400mfp-035

2-46 WorkCentre 6400 Service Manual

Theory of Operation

Photo Conductor Post-Exposure Control and Recovery

Ozone stagnant in areas near the Charge Corona is absorbed on the surface
of the Photo Conductor. This reduces sensitivity of the Photo Conductor,
causing white bands to occur on the image.
To prevent this image failure from occurring, the entire surface of the Photo
Conductor is exposed to light and thus neutralized. This process prevents the
surface of the Photo Conductor from absorbing ozone.
If the “Photo Conductor post-exposure control” is not performed due to a
paper misfeed, the entire surface of the Photo Conductor is exposed to light at
the same time that the “2nd Transfer Roller cleaning control” is performed
during the recovery procedure from the paper misfeed.

Photo Conductor Small Amount Rotation Control and Timing

The number of execution sequences is determined when the post process

following a print cycle is completed. The control is executed while the color PC
Drum Motor or Intermediate Transport Motor (M1) is at Standby state.
If the color Photo Conductors need to be turned slightly during monochrome
mode, the control is also executed for the color Photo Conductors.

Photo Conductor

Charge Corona

s6400mfp-031

WorkCentre 6400 Service Manual 2-47

Theory of Operation

Charge Corona

The Charge Corona deposits a charge to the surface of the Photo Conductor.

Charge Corona

s6400mfp-117

Charge Corona

Grid Mesh

Electrode s6400mfp-116

Output During Pre-Process

■ Color Mode - The Charge Corona voltage for all colors of toner is applied
after rotation of the color PC Drum Motor has stabilized.

■ Monochrome Mode - The Charge Corona voltage for K is applied after

rotation of the Intermediate Transport Motor (M1) has stabilized.

Output During Post-Process

The output of the Charge Corona voltage is shut down when the entire
exposed area of the Photo Conductor moves past the Charge Corona section
after the 1st Transfer process has been completed.

2-48 WorkCentre 6400 Service Manual

Theory of Operation

Developer

A Developer within each Imaging Unit contains a magnetic roll, which carries
a thin layer of toner, is covered by a thin semi-conductive sleeve over the
surface. The Developing Roller applies toner to the latent image formed on
the surface of the Imaging Unit.

Replenishing Screw Supply Roller Photo Conductor

Cleaning Blade
Charge Corona
Toner
Collecting
Screw

Agitating Screw

Developing Roller s6400mfp-110

Developer Drive Mechanism

The Developer drive mechanism consists of 2 motors: The M4 Motor drives

the Y, M, C Developers and the M5 Motor drives the K Developer. Both motors
are housed within the Main Drive Assembly.

Caution
The Developer Drive Motor M4 is aligned at the factory and must NOT be
removed from the Main Drive Assembly in the field.

Developing Motor (Y, M, C) (M4)

Developing Motor (K) (M5) K

C
M
Y

s6400mfp-119

WorkCentre 6400 Service Manual 2-49

Theory of Operation

Developer System

Two types of Developer systems are used: A non-contact Developer System

and an Alternating Current Application System (ACAS).
1. A negative charge (supply bias voltage Vr) is applied to the Supply Roller
to regulate the amount of toner sticking to the Developer Roller.
2. A negative charge (blade bias voltage Vb1) is applied to the 1st Regulator
Blade to negatively charge the toner and form a thin layer of toner.
3. Toner on the surface of the Developer Roller is evened out by the 2nd
Regulator Blade.

Developing Charge Neutralizing Sheet

Roller
Supply
Roller Photo Conductor

1st Regulator Blade

2nd Regulator Blade

s6400mfp-125

4. During development, DC + AC developer bias voltage (Vb) is applied to

the Developer Roller. The AC component of the developer bias voltage is
applied only during development. At any time other than development,
only the DC component of the developer bias voltage is applied.
5. Toner sticks to the Photo Conductor when the AC component of the
developer bias voltage (Vpp) is negative. The voltage and time length of
the negative component (Vpp) determines the image density.
6. A negative charge (charge neutralizing bias voltage: same potential as
the developing bias) is applied to the charge neutralizing sheet to
neutralize any toner left on the surface of the Developer Roller.
Neutralized toner is returned to the Supply Roller.

Charge Corona Charge Neutralizing Sheet/Developing Roller Bias

Supply Roller Bias

Regulator Blade Bias

Grid Mesh s6400mfp-126

2-50 WorkCentre 6400 Service Manual

Theory of Operation

Cleaning Mechanism

The Cleaning Blade is pressed against the surface of the Photo Conductor to
remove toner left on the surface (fixed blade system).

Cleaning Blade

s6400mfp-127

Toner that has been scraped off by the Cleaning Blade, is transported by the
Toner Collecting screw and collected in the waste transport section.

Photo Conductor

Cleaning Blade

Toner Collecting Screw

s6400mfp-128

WorkCentre 6400 Service Manual 2-51

Theory of Operation

Toner Collecting Port Shutter Mechanism

The Toner Collecting Port within each Imaging Unit is equipped with a shutter
mechanism that prevents toner from being spilled when the Imaging Unit is
removed from the printer.

Toner Collecting Port

s6400mfp-129

When the Imaging Unit is installed into the printer, the Shutter of the Toner
Collecting Port is opened and toner can be discharged from the Imaging Unit.

Closed

Open

Toner Collecting Port s6400mfp-130

2-52 WorkCentre 6400 Service Manual

Theory of Operation

Ozone Ventilation Mechanism

Ozone stagnant in areas near the Charge Corona Unit within each Imaging
Unit reduces sensitivity of the Photo Conductors, causing white bands to
occur in the image.
To prevent this image quality problem, the Photo Conductor, which changes
the location of the Drum relative to the Charge Corona, thereby preventing the
surface sensitivity from being reduced.
The Ozone Filter is used to remove ozone produced by the Charge Corona
Unit. Outside air is drawn in by the Exhaust Fan Motor through the opening at
the front end of the Charge Corona Unit and is discharged together with
collected ozone through rear Imaging Unit Holder (PL9.11) and Ozone Filter.
The Exhaust Motor Fan (FM13) is kept energized for 3 minutes, after the print
cycle has been completed. The Exhaust Motor Fan also cools down the
Imaging Units.

K
C
M

Ozone Filter
Exhaust Motor
Fan (FM13)

s6400mfp-033

WorkCentre 6400 Service Manual 2-53

Theory of Operation

Transfer Belt (1st Image Transfer)

The Transfer Belt accumulates the images produced by the four Developer
Rollers prior to transferring the composite image to the paper. The Transfer
Belt is conductive and receives a high positive charge from the High Voltage
Power Supply.

Pressure/Retraction Mechanism

Mechanism for driving the belt

Intermediate Pressure/Retraction Clutch 1 (CL4)

Transport Motor (M1)

Transfer Belt Drive Roller

Transfer Belt

Driven Roller
s6400mfp-039

Mechanism for driving the pressure/retraction motion

Pressure/Retraction Clutch 1 (CL4)

Pressure
Sliding Plate Cam
1st Transfer Rollers
(Y, M, C, K)

Intermediate
Transport
Motor (M1)

Sliding Plate
Toner Collecting Screw
Toner Collecting Port
s6400mfp-135

2-54 WorkCentre 6400 Service Manual

Theory of Operation

1st Transfer Roller Pressure and Retraction

To extend the service life of the Photo Conductor Y, M, C, the pressure

position of the 1st Transfer Roller is changed between the monochrome mode
and the color mode. The 1st Transfer Roller K does not have a retraction
mechanism and is pressed against the Photo Conductor K at all times.
The Transport Motor provides drive energy for pressure/retraction operation of
the 1st Transfer Roller Y, M, C.

Monochrome Mode

The 1st Transfer Roller Y, M, C is retracted and the Photo Conductor Y, M, C is

stopped at the ordinary Standby state

Color Mode

During the 1st Transfer in the color mode, the 1st Transfer Roller Y, M, C is
moved toward the Photo Conductor (pressed) so that the Transfer Belt is
pressed against the Photo Conductor.

Standby Mode

The Transfer Roller is moved (retracted) and the Photo Conductor is stopped
at the Standby state.
1. The Transport Motor and gear train drives the Pressure/Retraction Clutch
1 (CL4).
2. Rotation of the Pressure/Retraction Clutch 1 (CL4) turns the Pressure
Cam, which moves the Sliding Plate and the Retraction Lever.
3. When the Retraction Lever is lowered, the 1st Transfer Roller is pressed
against the Transfer Belt.

Sliding Plate
Pressure Cam

Retraction Lever

1st Transfer Roller

Photo Conductor

s6400mfp-040

WorkCentre 6400 Service Manual 2-55

Theory of Operation

Sliding Plate Pressure Cam

Retraction Lever

1st Transfer Roller

Photoconductor
s6400mfp-041

1st Transfer Roller Pressure/Retraction Position

Pressure Position

The pressure operation of the 1st Transfer Roller is controlled as the

Pressure/Retraction Sensor 1 (PS12) detects the movement of the Sliding
Plate.
1. The Pressure/Retraction Clutch 1 (CL4) is energized.
2. The Sliding Plate is moved to press the 1st Transfer Rollers up against the
Transfer Belt, blocking the Pressure/Retraction Sensor 1 (PS12).
3. With the Pressure/Retraction Sensor 1 (PS12) has been blocked, the
Pressure/Retraction Clutch 1 (CL4) is de-energized.

Retraction Position

The retraction operation of the 1st Transfer Roller is controlled as the

Pressure/Retraction Sensor 1 (PS12) detects the movement of the Sliding
Plate.
1. The Pressure/Retraction Clutch 1 (CL4) is energized.
2. The Sliding Plate is moved to retract the 1st Transfer Rollers from the
Transfer Belt, unblocking the Pressure/Retraction Sensor 1 (PS12), which
has been blocked.
3. With the Pressure/Retraction Sensor 1 (PS12) has been unblocked, the
Pressure/Retraction Clutch 1 (CL4) is de-energized.

Pressure/Retraction Sensor 1 (PS12)

Sliding Plate

s6400mfp-042

2-56 WorkCentre 6400 Service Manual

Theory of Operation

Transfer Belt Cleaning Mechanism

The Cleaning Blade, part of the Transfer Belt, is used to scrape residual toner
off the surface of the Transfer Belt. The Cleaning Blade is in pressed contact
with the Transfer Belt at all times. The Cleaning Blade cleans the surface of
the Transfer Belt as long as the belt turns. Toner scraped off by the Cleaning
Blade is collected in the middle of the Transfer Belt by the Toner Collecting
screw.

Transfer Belt

Cleaning Blade

Toner Collecting Screw

s6400mfp-036

The collected waste toner is transported through the Waste Toner Collecting
Port located in the middle of the Transfer Belt Unit and the Waste Toner
Transport Unit, and moved to the Waste Cartridge.

Toner Collecting Screw

Waste Toner
Collecting Port s6400mfp-136

WorkCentre 6400 Service Manual 2-57

Theory of Operation

1st Transfer Belt Cleaning

The Intermediate Transport Motor (M1) is energized to turn the Transfer Belt
due to that there is a possibility of the printer being stopped with toner left on
the surface of the Transfer Belt between the Cleaning Blade position and the
2nd Transfer position (due to paper misfeed or printer malfunction). Residual
toner is thereby removed from the Transfer Belt.

Operation Timing

The Auto Transfer Voltage Control (ATVC) System performs the 1st Transfer
cleaning and then the 2nd Transfer cleaning operation.

1st Transfer Cleaning Area

s6400mfp-045

1st Transfer Belt Backward Rotation

To prevent dust, toner, and debris from being wedged in the Cleaning Blade
while the Transfer Belt remains stationary, the Transfer Belt is turned
backward so that debris can be removed by the Cleaning Paddle.
Once the Transfer Belt starts turning backward, this operation takes
precedence over any other request to energize the Intermediate Transport
Motor (M1).

Rotation

Backward Rotation

s6400mfp-638

Operation Timing

The 1st Transfer Belt backward rotation is performed after a specified number
of printed pages are produced since the last backward rotation control.

2-58 WorkCentre 6400 Service Manual

Theory of Operation

1st Transfer Output

To transfer the toner image from the Photo Conductor to the Transfer Belt, the
transfer voltage is applied to the 1st Transfer Roller. A charge of the same
potential is applied to each of the 1st Transfer Rollers. The transfer voltage is
applied after the 1st Transfer Roller (Y, M, C) is pressed against the Transfer
Belt for color mode.
The transfer output is turned Off after the last image moves past the 2nd
Transfer section.

Pressure/Retraction Sensor 1 (PS12)

Transfer Belt Drive Roller
Driven Roller Sliding Plate Pressure Cam
Retraction Lever (Y, M, C) Transfer Belt

1st Transfer Roller (M) 1st Transfer Roller (K)

1st Transfer Roller (Y) 1st Transfer Roller (C)
Cleaning Blade
Toner Collecting Screw s6400mfp-037

WorkCentre 6400 Service Manual 2-59

Theory of Operation

Transfer Roller (2nd Image Transfer Roller)

The Transfer Roller, made of a conductive sponge, presses the paper against
the surface of the belt, and transfers the composite image to the paper for
fusing.

s6400mfp-065

2nd Image Transfer Roller Pressure Mechanism

The 2nd Transfer Roller is pressed against the Transfer Belt and then retracts
from the Transfer Belt. This process prevents the 2nd Transfer Roller from
getting dirty due to patterns produced for purposes other than an actual
printing operation. Such patterns may be produced during the image
stabilization sequence or other functions.

Transfer Belt

2nd Transfer Roller

Pre-Transfer Guide Plate

s6400mfp-048

2nd Transfer Roller Pressure

The 2nd Transfer Roller moves to position which allows the toner image on the
Transfer Belt to be transferred onto the paper. The 2nd Transfer Roller is
pressed against the Transfer Belt to allow the Roller to be cleaned.

2-60 WorkCentre 6400 Service Manual

Theory of Operation

2nd Transfer Roller Retraction

The 2nd Transfer Roller is retracted from the Transfer Belt when a calibration
pattern is produced on the Transfer Belt for registration correction control,
image quality control, or other control.
The 2nd Transfer Roller is retracted from the Transfer Belt when the toner
image on the Transfer Belt cannot be transferred to the paper due to a paper
empty condition occur during printing.
The 2nd Transfer Roller is retracted from the Transfer Belt after the 2nd
Transfer of the last image is completed during a multi-print cycle.

Pressure/Retraction

1. The Intermediate Transport Motor (M1) rotates the Drive Roller of the
Intermediate Transfer Belt which then rotates the Pressure/Retraction
Clutch 2 (CL5).
2. When the Pressure/Retraction Clutch 2 (CL5) is energized, the rotation is
transmitted to the Pressure Cam via a coupling gear.
3. When the Pressure Cam turns a half turn to push up the Pressure Lever,
the 2nd Transfer Roller is pressed against the Transfer Belt.
4. At the same time, the IDC Sensor Level is pushed up to open the IDC
Sensor Cover.
5. The Cam Flag on the shaft of the Pressure Cam blocks the Pressure/
Retraction Sensor 2 (PS13) and a pressed position of the 2nd Transfer
Roller is detected.

2nd Transfer Roller

Retraction Lever

Pressure/Retraction Clutch 2 (CL5)

Transfer Belt Drive Roller

Retraction Cam

Pressure/Retraction
Sensor 2 (PS13) s6400mfp-049

WorkCentre 6400 Service Manual 2-61

Theory of Operation

6. When the Pressure/Retraction Clutch 2 (CL5) is energized a second time,

the Pressure Cam is turned another half turn. This process releases the
Pressure Lever, causing the 2nd Transfer Roller to be retracted from the
Transfer Belt. At the same time, the IDC Sensor Lever is released, which
closes the IDC Sensor Cover.

When Pressed

2nd Transfer Roller

Retraction Lever

Retraction Cam s6400mfp-050

7. The Cam Flag unblocks the Pressure/Retraction Sensor 2 (PS13) and a

retracted position of the 2nd Transfer Roller is detected.

When Retracted

s6400mfp-051

Pressure Cam Angle

Retracted Pressed Retracted

s6400mfp-639

2-62 WorkCentre 6400 Service Manual

Theory of Operation

2nd Transfer Roller Pressure Position Deviation Preventive Mechanism

When the Right Door is opened and closed, the Pressure Cam is rotated to
prevent the 2nd Transfer Roller from moving from the pressure position.
The lever moves up or down as the Right Door is opened or closed, which
locks the coupling gear that drives the Pressure Cam.

Right Door Closed Right Door Open

Right Door Open/

Close Lever

Pressure Cam
s6400mfp-083

2nd Transfer Voltage

Transfer voltage is applied to the 2nd Transfer Roller, after the 2nd Transfer
Roller has been pressed against the Transfer Belt in order to transfer the toner
image from the Transfer Belt to the paper.

2nd Transfer Voltage Setting Control (ATVC: Auto Transfer Voltage Control)

The ATVC control is used to reduce the effect from changes in resistance of
the Transfer Belt, Transfer Roller, and environmental changes of toner.

ATVC Timing

■ A print request is accepted.

■ The temperature inside the printer changes beyond the specified range
during a multi-print cycle.

■ Image stabilization control is performed.

■ 1,000 to 2,000 printed pages have been produced after the last 2nd
transfer voltage control was performed.

■ The Transfer Roller is replaced.

■ The temperature and humidity inside the printer change beyond the
specified range after the last 2nd transfer voltage control was performed.

WorkCentre 6400 Service Manual 2-63

Theory of Operation

ATVC Control

1. The 2nd Transfer Roller is pressed against the Transfer Belt.

2. A constant current is applied to the 2nd Transfer Roller.
3. The voltage of the 2nd Transfer Roller surface is detected by the belt.
4. Using a conversion formula, the output value of the transfer voltage is
determined and the current temperature inside the printer is detected.
5. Based on the determined output value and current temperature, the 2nd
Transfer Roller Bias voltage is adjusted accordingly.

2nd Transfer Roller Cleaning

DC positive and negative bias voltages are sent from the HVPS-1 alternatively
applied to the 2nd Transfer Roller. This process allows toner residue on the
surface of the 2nd Transfer Roller to be transferred back to the Transfer Belt,
which cleans the 2nd Transfer Roller.
Any voltage for other control purposes is not applied during the cleaning
process. Toner transferred back to the Transfer Belt is collected by the
Transfer Belt Cleaning Blade.

2nd Transfer Roller

HV1
Cleaning Blade Transfer Belt s6400mfp-084

Cleaning Operation Timing

The 2nd Transfer Roller cleaning sequence is carried out after the
Intermediate Transfer Belt has been cleaned during recovery from a paper
misfeed.
The cleaning sequence is performed if 100 printed pages are produced after
the last cleaning sequence or when a paper size error occurs.

Cleaning Operation Control

1. The 2nd Transfer Roller is pressed or moved forward.

2. The 2nd transfer bias voltage of reverse polarity is applied for the period
of time corresponding to one revolution of the 2nd Transfer Roller.
3. The 2nd transfer bias voltage of forward polarity is applied for the period
of time corresponding to one revolution of the 2nd Transfer Roller.
4. Steps 2 and 3 are repeated for five times.
5. The 2nd Transfer Roller is retracted.

2-64 WorkCentre 6400 Service Manual

Theory of Operation

Paper Feed (Tray 1)

The Intermediate Transport Motor (M1) transmits drive energy through the
Paper Feed Clutch 1 (CL1) to turn the Feed Roller, thereby picking up and
feeding the paper. The paper is picked up, moved into position, then
transported onto the Registration Roller.
The paper is pressed against the stationary Registration Roller so that a
buckle is formed in the paper. The Feed Roller is then stopped, and the buckle
thus formed in the paper correcting any mechanical skew that may have
occurred.
Next, the Registration Roller Clutch engages the Registration Roller to
transport the paper.
At the same time that the Registration Roller is started, the Feed Roller is
started again so that the paper is transported further. This process reduces
load otherwise placed on the paper feed section.
As the trailing edge of the paper reaches a point immediately after the Feed
Roller, the Feed Roller is stopped.

Tray 1 Paper Empty Sensor 2 (PS7)

Empty Sensor Actuator

Tray 1 Paper Feed Clutch 1 (CL1)

Paper Lift Plate

Separation Roller Edge Guide Plate

Feed Roller
s6400mfp-161

Intermediate Transport Motor (M1)

Paper Feed Clutch 1 (CL1)

Feed Roller

s6400mfp-162

WorkCentre 6400 Service Manual 2-65

Theory of Operation

Paper Lift Plate Mechanism

The Paper Lift Plate is locked under the Paper Lift Plate Lock Lever by
pressing it down and is pressed toward the Feed Roller.
The Paper Feed Clutch rotates the Feed Roller to activate the Lift Plate Lock
Release Lever, and unlocks the Paper Lift Plate.
The Paper Lift Plate presses the paper against the Feed Roller as upward
pressure is applied by the springs.

Lock Position Feed Roller

Paper Lift Plate Paper Lift Plate

Lock Lever
Spring
Lock Release Position

s6400mfp-163

2-66 WorkCentre 6400 Service Manual

Theory of Operation

Paper Separation Mechanism

The Intermediate Transport Motor (M1) transmits drive energy through the
Tray 1 Paper Feed Clutch (CL1) to turn the Feed Roller. The Feed Roller
rotates to pick up and feed the paper into the printer. Double-feeding of the
paper is prevented by the Separation Roller with a torque limiter.

Intermediate Transport Motor (M1)

Paper Feed Clutch 1 (CL1)

Feed Roller

s6400mfp-162

Feed Roller

Separation Roller

s6400mfp-164

WorkCentre 6400 Service Manual 2-67

Theory of Operation

Paper Empty Condition Detection

A paper empty condition is detected when the Empty Sensor Actuator

unblocks the Tray 1 Paper Empty Sensor (PS7). Paper near-empty condition
cannot be detected by any mechanism.

Paper Present
Paper
Empty Sensor Actuator

Paper Lift Plate

Tray 1 Paper Empty Sensor (PS7) s6400mfp-166

Paper Empty

s6400mfp-167

2-68 WorkCentre 6400 Service Manual

Theory of Operation

Long Paper Guide Mechanism

The Paper Guide is used to hold a stack of long paper in place in Tray 1.

s6400mfp-169

Using the Paper Guide removes an unwanted gap between the Paper Empty
Sensor Actuator and a stack of long paper, and prevents the printer from
making an incorrect paper empty detection.

Paper Guide (Down)

Long Size Paper

Empty Sensor Actuator s6400mfp-171

WorkCentre 6400 Service Manual 2-69

Theory of Operation

Edge Guide Plate

The Edge Guide Plate can be adjusted to the exact size in the width direction
of the paper. The paper size cannot be detected by any other mechanism.

Edge Guide Plate

s6400mfp-172

Paper Misfeed Detection

If the Registration Sensor is not activated within a specified period of time

after a paper feed sequence has been started, the printer determines that
there is a paper misfeed. A paper jam error message is displayed on the
Control Panel. This error can be reset by opening the Right Side Door,
clearing the misfeed, then closing the Door.

2-70 WorkCentre 6400 Service Manual

Theory of Operation

Paper Feed (Tray 2)

The Intermediate Transport Motor (M1) transmits drive energy through the
Tray 2 Paper Feed Clutch (CL3) to turn the Feed Roller, thereby picking up
and feeding the paper. The paper is picked up, fed in, and transferred onto the
Registration Roller in the printer. Double-feeding of the paper is prevented by
the Separation Roller with a torque limiter.
The paper is pressed against the stationary Registration Roller so that a
buckle is formed in the paper. The Feed Roller is then stopped. The buckle
thus formed in the paper corrects any mechanical skew in the paper.
Next, the Registration Roller Clutch (CL2) engages the Registration Roller to
transport the paper. At the same time that the Registration Roller is started,
the Feed Roller is started again so that the paper is transferred further. This
process reduces the load otherwise placed on the paper feed section.
As the trailing edge of the paper reaches a point immediately after the Feed
Roller, the Feed Roller is stopped.

Separation Roller
Feed Roller
Trailing Edge Guide Plate

Edge Guide Plate Empty Sensor Actuator s6400mfp-175

Intermediate Transport Motor (M1)

Feed Roller

Tray 2 Paper Feed Clutch 1 (CL3)

s6400mfp-177

WorkCentre 6400 Service Manual 2-71

Theory of Operation

Paper Lift Plate Mechanism

The Paper Lift Plate is pressed down into the “Locked” position. When a paper
stack is loaded and the tray is pushed into the printer, the Lock Release Lever
unlocks the Paper Lift Plate.

Paper Lift Plate

Lock Release Lever

s6400mfp-179

The Paper Lift Plate presses the paper against the Feed Roller, and the Paper
Lift Plate is pressed upward by the springs.

Paper Lift Plate

Feed Roller

Springs

s6400mfp-178

2-72 WorkCentre 6400 Service Manual

Theory of Operation

Paper Supply Level Detection

A window in the Front Cover of the tray indicates the paper supply level. When
the Paper Lift Plate goes up, a red lever appears in the window. The lower the
level of the paper stack, the more the red portion is visible.

Lever

s6400mfp-180

Paper Supply
Level Indicator

Paper Empty Condition

Paper Full Condition s6400mfp-062

WorkCentre 6400 Service Manual 2-73

Theory of Operation

Paper Empty Condition Detection

The paper empty message is displayed on the Control Panel when the Empty
Sensor Actuator unblocks the Paper Empty Sensor 2. Paper near-empty
condition cannot be detected mechanically. The paper supply level indicator
located at the front of the tray provides a visual indication of the amount of
paper present.

When Paper is Loaded

Tray 2 Paper Empty Sensor 2 (PS8)
Paper Empty Sensor Actuator

s6400mfp-063

A Paper Empty Condition

Paper Lift Plate

s6400mfp-064

2-74 WorkCentre 6400 Service Manual

Theory of Operation

Edge Guide Plate

The Edge Guide Plate is used for setting the appropriate paper position in the
Tray which corresponds to the width of the paper to be loaded (A4 or Letter).
Paper size cannot be detected by any other mechanism.

Edge Guide Plates

s6400mfp-181

Lock Plate
Lock Plate

Positioning Pins
Positioning Pin s6400mfp-182

WorkCentre 6400 Service Manual 2-75

Theory of Operation

Trailing Edge Guide Plate

The Trailing Edge Guide Plate is used for setting the appropriate paper
position which corresponds to the length of the paper (A4 or Letter).

Trailing Edge
Guide Plate

s6400mfp-185

Positioning
Plate
Lock
Lever

s6400mfp-186

A4 Position A Position

A4 11 A4 11 s6400mfp-187

2-76 WorkCentre 6400 Service Manual

Theory of Operation

Tray Open/ Close Detection

The Tray 2 Switch detects the tray when it is opened or closed. Closing the
tray makes the Tray Detection Plate turn On the Actuator for the Tray 2 Switch
on the printer frame.
The Switch turns Off when the tray is pulled out. A tray open message
appears on the Control Panel.

Tray Detection Plate

s6400mfp-188

Paper Size Switch

Actuator

Tray Detection Plate

s6400mfp-189

Paper Misfeed Detection

If the Registration Sensor is not activated within a specified period of time

after a paper feed sequence has been started, the printer determines that
there is a paper misfeed. A paper jam error appears on the Control Panel.
The paper misfeed display can be reset by opening or closing any door.

WorkCentre 6400 Service Manual 2-77

Theory of Operation

IDC Sensor (Density Control)

Two IDC Sensors are contained within the IDC Sensor Guide (as shown in
“Parts List 14.0 Transfer Belt Unit” on page 35).
A Reflective Sensor is used for each IDC Sensor. These Sensors detect the
amount of toner sticking to the front and rear surface of the Transfer Belt.
Image stabilization is performed based on the value detected.

s6400mfp-047

IDC Sensor

IDC Sensor
Shutter Lever
s6400mfp-057

Rear IDC Sensor

Registration Roller

When the paper is picked up and fed (by the Feed Roller within the paper tray
to the Registration Roller), a buckle is formed in the paper and the paper
transport is temporarily stopped. The buckle in the paper corrects skew in the
paper.
The Registration Sensor (PS9) detects whether or not the paper has reached
the Registration Roller. The paper fed in is synchronized with the image
before paper transport is restarted.

Paper Loop Sensor (PS10)

Charge
Neutralizing Cloth Registration
Roller
2nd Transfer
Roller Registration
Clutch (CL2)

OHP Sensor (PS5)

Registration Sensor (PS9)

Temperature/
Humidity Sensor

s6400mfp-066

Registration
Clutch (CL2) Transfer Roller Unit

Pressure/Retraction
Clutch 2 (CL5)

Intermediate Transport Motor (M1)

Registration Roller

Transfer Belt Driver Roller

s6400mfp-067

WorkCentre 6400 Service Manual 2-81

Theory of Operation

Paper Detection

When the paper fed from the Feed Roller pushes the Actuator of the
Registration Sensor (PS9) upward, the sensor is unblocked. When this
occurs, the printer determines that the paper has reached the position before
the Registration Roller.

Registration Roller

Paper from Duplex

Actuator
Registration Sensor (PS9)

Tray 1, 2, 3

Paper from Tray s6400mfp-068

Paper Transport Speed

The Duplex Transport Motor (M8) provides drive energy to the transport
section. The transport speed varies in four steps and the appropriate one is
selected according to the paper type and print mode as listed in the table.

Paper Type/Print Mode Paper Transport Speed Reason

Plain paper (monochrome print) 216 mm/s

(8.5 in/s)
Plain paper (color print) 185 mm/s
(7.3 in/s)
■ Heavy Weight 76 mm/s To ensure good
■ Extra Heavy Weight (3.0 in/s) fusing performance
■ Thick Card Stock
■ Gloss Coating
■ Heavy Gloss Coating
■ Postcard
■ Label
■ Transparency
■ Envelope
■ Other Type
Heavy Gloss Coating 61.7 mm/s To ensure good
(2.4 in/s) glossy performance

2-82 WorkCentre 6400 Service Manual

Theory of Operation

For the 1st print, based on the paper type/print mode, the printer determines
the appropriate speed starting a print/paper feed sequence, starts the print/
paper feed sequence.

Paper Transport Temporary Stop

Paper Transport Stop

After the Registration Sensor (PS9) has detected the leading edge of the
paper in a specified period of time, paper conveyance in the paper feed/
transport section is stopped.

Registration Clutch

In synchronization with the leading edge of the image (the sub scan print start
signal of the controller) after the leading edge of the paper has reached the
Registration Roller and a loop has been formed in the paper, the Registration
Clutch (CL2) is energized to start turning the Registration Roller.
After the trailing edge of the paper deactivates, the Registration Clutch (CL2)
is deactivated to stop the Registration Roller.

Control Loop Formed Before 2nd Transfer

A loop is formed in the paper by the difference between the 2nd Transfer
Roller paper transport speed. The loop formed in the paper realigns the front
edge as necessary to minimize skew.

Transfer Belt

2nd Transfer Roller

Registration Roller

Paper s6400mfp-070

WorkCentre 6400 Service Manual 2-83

Theory of Operation

Paper Neutralization

The Charge Neutralizing Cloth neutralizes any charge left the in the paper
after the 2nd Transfer process. Any residual charge is grounded through the
Charge Neutralizing Cloth to the printer frame.

Charge Neutralizing Cloth

2nd Transfer Roller

Paper s6400mfp-071

2-84 WorkCentre 6400 Service Manual

Theory of Operation

Transparencies Detection

Transparencies are detected by the OHP Sensor (PS5). The OHP detection is
made after the loop has been formed in the media before the Registration
Roller.

Registration Roller

Prism

OHP Sensor (PS5)

s6400mfp-072

If the output voltage of the OHP Sensor is less than a specified value, the
printer determines that the paper is a type other than transparency. If the
output voltage is the specified value or higher, the printer determines that the
paper is transparency.

Sensor Prism

Sensor Output

LED Remote

s6400mfp-085

WorkCentre 6400 Service Manual 2-85

Theory of Operation

Paper Size Error Detection

The Registration Sensor and Paper Feed Sensor detect the size of the paper.
The length detection starts when the Registration Sensor is activated and
ends when it is deactivated for each paper source.
For the Optional 500-Sheet Feeder, even if the Paper Feed Sensor does not
detect a paper size error, the Registration Sensor makes an error check
again.

Paper Length
Paper Source Starting Point Ending Point
Detection Sensor

Tray 1 Registration Sensor Registration Clutch Registration Sensor

(PS9) (CL2): ON (PS9): OFF
Tray 2 Registration Sensor Registration Clutch Registration Sensor
(PS9) (CL2): ON (PS9): OFF
Tray 3/4 Paper Feed Sensor Paper Feed Sensor Paper Feed Sensor
(Optional 500- Tray 3 (PS23) (PS9) ON (PS23): OFF
Sheet Feeder)
Registration Sensor Registration Clutch Paper Feed Sensor
(PS9) (CL2): ON (PS23): OFF
Duplex Unit No paper length is detected.

Paper Path Transport System Paper Misfeed Detection

In the feeding section, a specific sensor is assigned for each section of the
paper transport system to detect a paper misfeed that could occur along the
path.

Paper Exit Sensor (PS15) Horizontal Transport

Fuser Exit Sensor (PS1)

Paper Exit Assembly

Paper Loop Sensor (PS10)

Registration Roller/
Registration Roller Clutch (CL2)

Registration Sensor (PS9)

Duplex Transport
Sensor (PS16)

s6400mfp-073

2-86 WorkCentre 6400 Service Manual

Theory of Operation

Misfeed Detection

Misfeed Detection Misfeed Detection

Misfeed Type
Starting Point Condition

Misfeed at Tray 1 Paper Feed Clutch 1 Registration Sensor (PS9)

Feeding (CL1) ON not activated within a
Section specified time
Tray 2 Paper Feed Clutch 2
(CL3) ON
Tray 3 Paper Feed Clutch Paper Feed Sensor (Tray 3)
(CL1: Tray 3) ON not activated within a
specified time
Tray 4 Paper Feed Clutch Paper Feed Sensor (Tray 4)
(CL1: Tray 4) ON not activated within a
specified time
2nd Side Transfer Motor (Duplex Registration Sensor (PS9)
in Duplex Unit) ON not activated within a
Printing specified time
All Trays Registration Roller When the Registration
Clutch (CL2) ON Roller Clutch (CL2) is
activated, the Feed Clutch 1
(CL1), Feed Clutch 2 (CL3),
and Feed Clutch (Tray 3,
Tray 4) also are activated.
Misfeed at vertical paper Paper Feed Sensor Registration Sensor (PS9)
transport section (PS23: Tray 3) ON not activated.
Paper Feed Sensor (Tray 3)
not deactivated.
Paper Feed Sensor Registration Sensor (PS9)
(PS23: Tray 4) ON not activated.
Paper Feed Sensor (Tray 4)
not deactivated.
Misfeed at Paper Registration Sensor Registration Sensor (PS9)
2nd Transfer other than (PS9) activated not activated
Section long size
Exit Sensor (PS1) not
paper
deactivated
Registration Roller Registration Sensor (PS9)
Clutch (CL2) activated not deactivated
Long size Registration Sensor After long size Paper
paper (PS9) ON Registration Sensor
and Registration Sensor
(PS9) activated, they are
not deactivated in two
seconds.
Misfeed at Fusing Exit Exit Sensor (PS1) Registration Sensor (PS9)
Section activated not deactivated
Exit Sensor (PS1) Duplex Control Board not
deactivated activated

WorkCentre 6400 Service Manual 2-87

Theory of Operation

Misfeed Detection (Continued)

Misfeed Detection Misfeed Detection

Misfeed Type
Starting Point Condition

Misfeed at Duplex Unit Duplex Unit Feed Sensor Registration Sensor (PS9)
activated not activated
Duplex Control Board not
deactivated
Misfeed at Paper Exit Horizontal Transport Paper Exit Sensor (PS15)
deactivated not activated

The paper misfeed display can be reset when all doors are closed. Then the
printer attempts to detect any sheet of paper left inside the paper path.

Remaining Paper Detection Control When the Main Power Switch is Turned On

The printer checks the sensors sequentially, and if a sensor is found to be

activated, it determines that there is a sheet of paper left inside the printer.
This detection control is also performed when a Cover is closed.

Temperature/ Humidity Sensor

The Temperature/ Humidity Sensor (PL11.1) detects temperature and

humidity inside the printer. Detected data is used for image quality control,
ATVC control, and transfer output control.

s6400mfp-526

2-88 WorkCentre 6400 Service Manual

Theory of Operation

Fusing

The Fuser applies toner onto paper using heat and pressure.

s6400mfp-665

Fuser Exit Roller

Fusing Paper Size Sensor (PS2)

Exit Sensor (PS1)

Thermistor 2 (TH2)
Fusing Pad
Fusing Belt
Fusing Heater
Thermostat 1 Lamp 2 (FH2)
(TS1)
Thermistor 1 Fusing
(TH1) Pressure Roller
Heating Roller
Fusing Heater Thermostat 2 (TS2)
Lamp 1 (FH1)
s6400mfp-194

WorkCentre 6400 Service Manual 2-89

Theory of Operation

Fusing Pressure Roller Pressure Selection Mechanism

Exit Roller

Fusing Pressure Roller

Fusing Belt

Heating Roller

Fusing Motor (M2)

s6400mfp-074

Fusing Motor (M2)

Fusing Pressure Roller

Fusing Belt

Heating Roller s6400mfp-052

Fusing Motor (M2) Paper Exit Roller

s6400mfp-056

2-90 WorkCentre 6400 Service Manual

Theory of Operation

Fusing Pressure Roller Drive

To minimize wrinkling and embossing when printing envelopes, pressure

applied by the Fusing Pressure can be changed (or reduced). A pressure
selection mechanism varies pressure in two steps. The pressure is selected
by placing the pressure selector dial in either of the two positions that are
180° apart from each other.
Setting the dial in the appropriate position selects the corresponding pressure
applied by the Fusing Pressure Roller to the Fusing Pad.
When printing envelopes, the dial should be set in the bottom position.
When the print cycle using envelopes is completed, be sure to set the dial
back in the original position.
If the print cycle is started without first selecting the appropriate position of the
dial, envelopes are very likely to wrinkle, or the image could be poorly fused
on plain paper and similar paper.

Pressure
Selector Dial

Fusing Pad

Fusing
Pressure
Roller

s6400mfp-075

Fusing Speed Selection Control

The Fusing Motor ((M2) provides energy for the fusing section. The
appropriate fusing speed is selected according to the paper type and print
mode to prevent fusing failure.
In the Glossy Paper mode, the appropriate fusing speed is selected according
to the paper type.

Fusing Speed Control (Control of Loop Before Fusing)

To prevent double transferred images and streaking from occurring, the

difference between the fusing speed and the paper transport speed during
image transfer is corrected.
The Paper Loop Sensor (PS10) detects the length of the loop formed in the
paper between the 2nd Transfer Roller and the Fusing Pressure Roller. The
fusing speed is then varied according to the length of the loop detected. By
varying the fusing speed, any effects from the Fusing Pressure Roller side
(part-to-part variations, change of parts over time) are prevented from being
transferred to the 2nd Transfer section.

WorkCentre 6400 Service Manual 2-91

Theory of Operation

No loop control is provided to perform the fusing speed process when

envelopes are used (to prevent wrinkles).

Fusing Deceleration (Low Speed)

When the paper loop length is small, the Actuator of the Paper Loop Sensor
(PS10) is pushed up a small amount and the sensor is unblocked. When the
sensor is unblocked, the fusing speed is decelerated (-3%).
For the second side in the Duplex mode, the speed decreases by 1.0%.

Fusing
Pressure Roller

Actuator

Paper Loop Sensor (PS10)

2nd Transfer Roller s6400mfp-053

Fusing Acceleration (High Speed)

When the paper loop length is large, the Actuator of the Paper Loop Sensor
(PS10) is pushed up a large amount and the sensor is blocked. When the
sensor is blocked, the fusing speed is accelerated (+3%).
For the second side in the Duplex mode, the speed increases by +1.5%.

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2-92 WorkCentre 6400 Service Manual

Theory of Operation

Fusing Pressure Roller Deformation Prevention

The Fusing Pressure Roller is automatically turned if it is left idle for a

specified period of time to prevent from being deformed.
If the printer remains in the Standby state for a specified period of time, the
Fusing Motor is energized for a specified period of time.
If the printer remains in the power save mode for a specified period of time,
the temperature control is started. After the temperature goes up to a
specified value or higher, the Fusing Motor is energized for a specified period
of time.

Fuser Paper Exit Detection

The Fuser Exit Sensor (PS1) is placed right after the paper is transferred from
the Fusing Belt and Pressure Roller in order to detect any paper jams and
prevent from possibly damaging the Fuser Pressure Roller.

Fusing Temperature Control

To fuse the toner image on the paper, the Heater Lamps are turned On and
Off as necessary to bring the fusing temperature to an appropriate level.
The Thermistors are used to detect the surface temperatures of the Heating
Roller and Fusing Pressure Roller.
Fusing temperature includes two types of temperature:

■ Standby Temperature: The control temperature in the print command

Wait state.

■ Print Temperature: The temperature that is required for the toner image
to be applied permanently onto paper.

Warm-Up Control

Warm-up control occurs when the temperature of the Heating Roller reaches
a specified level. The Power Save mode is not activated during a warm-up
cycle. Warm-Up control starts when the power switch is turned On, a
malfunction or paper misfeed is reset, the printer leaves Power Save mode, or
a door is closed.
Warm-Up control ends when the Heating Roller reaches a specified
temperature, a malfunction or paper misfeed is reset, or a door is opened.

Post Warm-Up Control

After warm-up cycle has been completed, the Fusing Pressure Roller and
Fusing Belt are rotated while heating to a required temperature as the printer
terminates the post-warm-up control sequence. Post-warm-up control
sequence are not performed if a print request is received.
The post warm-up control is ended when a specified period of time elapses
after the post-warm-up control has been started, when a Power Save Mode
signal is received, or the temperature of the Heating Roller and Fusing
Pressure Roller reach a specified temperature or higher.

WorkCentre 6400 Service Manual 2-93

Theory of Operation

Wait Control

At the end of the post-warm-up control, the end of the post-print cycle control
(print start control), or the end of the proactive control, Wait control is provided
to ensure that the temperature at different parts of the Fusing Unit reach a
constant level during the Wait state.
Wait control ends when a print request is received, a malfunction or paper
misfeed occurs, or a Power Save mode signal is received.

Proactive Control

The rotation of the Fusing Motor is controlled to shorten the time from when a
print request is accepted and when a page is printed. Proactive control ends
after the lapse of a specified time, at the start of a print cycle, when a
malfunction occurs, or at the start of the Power Save mode.

Print Control

The fusing speed, Fusing Pressure Roller temperature, and Fusing Belt
temperature are controlled to ensure a good fixing level and light transmission
performance of the transparency. Print control occurs when a print request is
received and ends when a malfunction or paper misfeed occurs.

Post-Print Control

An intermediate temperature between the Print temperature and the Wait

temperature is provided to prevent fusing temperature from rising after the
print cycle has been completed.
When the trailing edge of the last sheet of paper has cleared the Exit Sensor,
the Post printer temperature control starts after a specified amount of time.
Post-print control ends when a print request is received, a door is opened, or
an error condition occurs.

Heater Off Control

Heater Off control is suspended when a malfunction or paper misfeed occurs

or a Power Save mode signal is received. Heater Off control occurs when a
door is opened, an error or malfunction occurs, or a Power Save mode signal
is received. When Heater Off control ends, the following activities are reset:
an open door, an error or malfunction that has occurred, and a Power Save
mode signal that has been received.

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Theory of Operation

Pages Per Minute (PPM) Control

The PPM control is performed to prevent the Fusing Pressure Roller and
Fusing Belt temperatures from going down during a multi-print cycle as well
as to prevent the temperatures of the Roller and belt edges from increasing.
When a multi-print cycle is running, the temperature of the Fusing Pressure
Roller and Fusing Belt decrease, resulting in the fusing performance of the
printed image being degraded. To prevent this problem, fusing performance is
estimated based on the surface temperature of the Fusing Pressure Roller;
the distance between sheets of the paper is widened according to the paper
length and fusing speed, thereby allowing the Fusing Pressure Roller and
Fusing Belt to recover the required temperature; the fusing performance of the
printed toner image is thus guaranteed.
If a multi-print cycle is running using a paper of a small size, the difference is
produced in temperature between the center portion of the Roller/Belt (the
surface over which the paper moves past) and the edges of the Roller/Belt
(where no part of the paper moves past). Since the Thermistor is located at
the center portion, the printer determines that there is a drop in roller
temperature and turns On the Heater to increase the roller temperature. This
also heats the edges of the roller, at which a high temperature is still
maintained. This process increases the overall temperature.
To prevent this situation from occurring, the distance between sheets of paper
is widened and the temperature of the Fusing Pressure Roller and Fusing Belt
is thereby made uniform.
PPM control occurs based on low temperature and low humidity, high
temperature and high humidity, when a small size of paper is detected
through paper width detection control, or the Heating Roller temperature
becomes lower than a specified level.
PPM control ends when the control proceeds to “Wait Control” or “Heater Off
Control” during the PPM control or the paper that requires no PPM control is
fed through during PPM control.

WorkCentre 6400 Service Manual 2-95

Theory of Operation

Protection Against Abnormally High Temperature

The printer provides protection at three different stages to prevent abnormally

high temperatures within the Fuser.

1st Stage: Soft Protection

If the Thermistor 1 or Thermistor 2 detects a temperature exceeding a

specified value, the error code representing abnormally high temperature is
displayed. At this time, the Heater Lamps are turned Off and the initiation of
any new print cycle is prohibited (abnormally high temperature detection
control).

2nd Stage: Hard Protection

The following hard protections occur when the CPU within the Engine Control
Board (MCU Board) is unable to detect an abnormally high temperature.
1. The Thermistor 1 or Thermistor 2 detects temperature exceeding the
specified value.
2. The remote signal for the corresponding Heater Lamp of the DC Power
Supply is automatically turned Off through the Engine Control Board
(MCU Board).
3. The triac on the DC Power Supply is turned Off in which turns Off the
Heater Lamp.
4. The temperature detected by the Thermistor 1 or Thermistor 2 is
decreased to a level below the specified value indicating a malfunction.
5. The remote signal of the corresponding Heater Lamp is reset to turn it
back on. This process is repeated until the CPU recovers in order to
detect the high temperature condition. This control allows the power
supply to the corresponding Heater Lamp to be shut down before the
Thermostat operates, preventing the Fuser Unit from getting damaged.

3rd Stage: Thermostat Protection

If neither the Soft Protection nor Hard Protection can prevent abnormally high
temperature, the Thermostat 1 and Thermostat 2 activate once the
temperature has been reduced; it resets the Heater Lamp 1/2 automatically.
This shuts down the power supply to the Fusing Heater Lamp 1 and Fusing
Heater Lamp 2, thus automatically turning them Off.

2-96 WorkCentre 6400 Service Manual

Theory of Operation

Horizontal Transport

The Transport Unit controls paper fed out from the Fuser, reverse operations
for paper during 2-sided printing, and drives for feeding paper out into the
Finisher section.

s6400mfp-876

Transport Roller Drive and Slip Mechanisms

For 1-sided or 2-sided printing, the Drive Motor rotates the Transport Rollers 1
and 2 in the forward direction via a Torque Limiter, thereby transporting the
paper in the forward direction.
When fusing of the first print process is completed, the motor starts rotating in
the backward direction, turning the Transport Rollers 1 and 2 backward. The
paper is thereby subjected to the reverse operation, which is fed backward
into the main body.

Finisher Section/
Transport Roller Paper Fed in
Paper Fed in First Next Sequence

Transport Roller 2
Transport Roller 1
Finisher Section/
Aligning Plate Roller
s6400mfp-255

WorkCentre 6400 Service Manual 2-97

Theory of Operation

The Torque Limiter provides drive energy to the Transport Rollers 1 and 2.

Torque Limiters

Transport Roller 1
Transport Roller 2
s6400mfp-528

Paper Transport

The Transport Rollers 1 and 2 transport paper to the Paper Exit and Finisher
sections.
After 1 side of the paper has been printed, the paper is reversed back into the
main body of the printer.

Finisher Section Transport Unit Section IOT Body

Transport Roller 2
Transport Roller 1
s6400mfp-251

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Theory of Operation

The Fusing Motor (M2) and the Duplex Reverse Motor (M9) provide drive
energy to transport the paper from the printer, control the reverse operations
for the paper during 2-sided printing, and transport the paper out into the
Finisher section.

Duplex Reverse Motor (M9)

Transport Roller 1

Transport Roller 2
s6400mfp-645

Paper Exit

The Transport Unit takes paper fed out of the printer and transports it to the
Exit Tray.

Paper Full Sensor Actuator Exit Roller Exit Sensor Actuator

s6400mfp-643

WorkCentre 6400 Service Manual 2-99

Theory of Operation

Detection of Paper Full in the Exit Tray

The Paper Full Sensor (PS14) detects the load capacity of output paper in the
Exit Tray. When the Paper Full Sensor Actuator is low, the edge of the Paper
Full Sensor Actuator covers the Paper Full Sensor.
As the tray gets full, the output paper pushes the Paper Full Sensor Actuator
up and the edge of the actuator activates the Paper Full Sensor.
When the output tray is emptied, the Paper Full Sensor Actuator goes down
and the edge of the actuator covers the Paper Full Sensor. If the sensor is
covered, the printed paper has not reached the maximum load capacity.
The Paper Full Sensor (PS14) becomes inactive when a Finisher is attached
to the printer.

When Tray is Empty

Exit Sensor 2 (PS15)

s6400mfp-647

When the tray is full

Paper Full Sensor (PS14)

s6400mfp-648

2-100 WorkCentre 6400 Service Manual

Theory of Operation

Image Quality Control (Image Stabilization)

To ensure that a quality image is produced at all times, a comprehensive

control is provided for the developing bias voltage, laser light intensity,
registration correction, gamma characteristics detection, and other
parameters.
Image quality control may be divided into three types:

■ Complete Correction Control

■ Simplified Correction Control

■ Individual Registration Control

The following information provides specific details of each type of control.

Complete Correction Control

Control Name Purpose

1 IDC Sensor Changes in various types of characteristics due to

Calibration Control change with time of the IDC Sensor (deteriorated
LED, dirty sensor surface), part-to-part variations in
the sensors, and change of environment affect the
IDC Sensor output corresponding to the clear
Transfer Belt surface.
To correct fluctuations in the output, the sensor LED
intensity is adjusted so as to keep the IDC Sensor
output constant.
2 Developing Bias Vpp If the developing bias voltage (Vpp) is too high for
Control the Ds distance in each Toner Cartridge, a leak image
(background leak, image area leak) results.
If Vpp is excessively low, halftone reproducibility
becomes poor. This control detects a Vpp range, in
which no image failure occurs, to set the optimum
Vpp.
3 Developing Bias Corrects the target amount of toner sticking to the
Duty Control Transfer Belt to form the solid image.
(control of the
maximum amount of
toner sticking to the
Transfer Belt)
4 Laser Light Intensity Corrects the target level of fluctuations in fine line
Control reproduction and reverse image (white on black)
reproduction that occur due to variations in photo
conductor characteristics (part-to-part variations,
environment, durability).
5 Gamma Corrects the tone by using the IDC Sensor to
Characteristics measure the density of a gradation pattern produced
Detection Control on the Transfer Belt and sends the results of the
measurement to the controller.
6 Registration Corrects color mis-registration that occurs due to
Correction Control variations in parts of the printer used for regulating
CMYK color alignment.

WorkCentre 6400 Service Manual 2-101

Theory of Operation

Simplified Correction Control

Control Name Purpose

1 IDC Sensor Offset Checks the low gain output value and other offset
Value Check voltage value of the IDC Sensor when the shutter is
closed.
2 IDC Sensor Checks the low gain output value of the IDC Sensor
Reflection Output using the intensity value set for the Clear Transfer
Belt surface on which no toner sticks.
3 Developing Bias Determines whether there is a leak based on the
Control (simplified measurement value taken last.
Vpp check)
4 Developing Bias Corrects the amount of toner based on the
Duty Control measurement value taken last.
(control of the
maximum amount of
toner sticking to the
Transfer Belt)
5 Laser Light Intensity Performs correction based on the measurement
Control (simplified value taken last.
correction control)
6 Registration Corrects color mis-registration that occurs due to
Correction Control variations in parts of the printer used for regulating
(simplified control) CMYK alignment. The simplified control uses a
simplified registration pattern to make the
correction.

Note
If the Simplified Correction Control is not effective, the Complete
Correction Control is performed.

Individual Registration Control

Control Name Purpose

1 IDC Sensor Checks the low gain output value of the IDC Sensor
Reflection Output using the intensity value set last for the Clear
Transfer Belt surface on which no toner sticks.
2 Registration Corrects color mis-registration that occurs due to
Correction Control variations in parts of the printer used for regulating
(simplified control) CMYK alignment.

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Theory of Operation

Image Quality Control (Image Stabilization) Execution Request

A request to perform the Complete Correction Control, Simplified Correction

Control, or Individual Registration Control is made at the following timing.

Stabilization Type of
Stabilization Request Timing Request Stabilization
Initialization Executed

Upon ■ When a new When the power Complete Correction

replacement Imaging Unit is switch is turned On Control
of the detected
■ When a used
Imaging Unit
Imaging Unit is
or Transfer detected
Belt
When the Transfer When the Front/Right Complete Correction
Belt is replaced Door is closed Control
By a status When the power When the power Depending on each
or condition switch is turned On switch is turned On condition
within the
When there is a The power switch is Complete Correction
engine
significant change in turned On Control
environmental ■ When the Front/
conditions from Right Door is closed
those when the last at the end of a job
stabilization ■ When the Sleep

sequence was mode is deactivated

executed
When there is a When the Front/Right Individual
temperature change Door is closed Registration Control
inside of the Laser ■ At the end of a job
Unit ■ During a job

■ When the Sleep

mode is deactivated
At the end of a print At the end of a job, Simplified Correction
cycle when the Front/Right Control
Door is closed
When fault is reset When the power Completed Correction
switch is turned On Control
Special When all trays get The power switch is Complete Correction
Situation empty turned On Control
User When image quality When Image Quality Complete correction
Selection is poor Calibration is selected control

WorkCentre 6400 Service Manual 2-103

Theory of Operation

Fan Assemblies

There are 5 fans in the printer that help to control the internal temperature or
provide air circulation.

■ DC Power Supply Fan

■ Cooling Fan (Horizontal Transport)

■ Fusing Fan

■ Ozone Ventilation Fan (Exhaust Fan)

■ I/P Board Cooling Fan

DC Power Supply Fan (FM11)

Cooling Fan (FM14)

Fusing Fan (FM12)
Image Processor
Board Fan (FM15)

Exhaust Fan

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Theory of Operation

Function

DC Power Supply Fan

Fusing Fan

Exhaust Fan s6400mfp-078

DC Power Supply Fan

The DC Power Supply Fan discharges heat generated from the internal parts
(including the DC Power Supply, Intermediate Transfer Belt section, Toner
Cartridges C, M, Y, and Motor Drives) within the printer to prevent excessive
temperature increases.

Cooling Fan (Horizontal Transport)

The Cooling Fan discharges heat accumulated between the Scanner section
and Horizontal Transport section of the printer.

Fusing Fan

The Fusing Fan discharges heat generated from the interior parts (including
the DC Power Supply, Fuser Unit, Toner Cartridge K, and Motor Drives) out of
the printer to prevent the interior temperature from rising.

Exhaust Fan

The Exhaust Fan discharges heat generated from the Laser Unit to prevent
the Laser Unit temperature from becoming high. The Exhaust Fan removes
ozone produced from the charging section of each Imaging Unit.
There is no air flow through areas around the Toner Cartridges. This prevents
toner from scattering inside the printer.

I/P Board Cooling Fan

The I/P Board Cooling Fan discharges heat generated from the I/P Board.

WorkCentre 6400 Service Manual 2-105

Theory of Operation

Duplex Unit

The Duplex Unit provides 2-sided print capability to the printer.

Duplex Unit

s6400mfp-655

Duplex Reverse Mechanism

Reverse Operation

The Duplex Reverse Motor (M9) provides drive energy to the Transport Unit.
When the motor is energized, drive energy is transmitted via a gear train to
rotate the Transport Rollers 1 and 2.

Transported Into the

Duplex Option

Fuser Exit Roller

s6400mfp-206

2-106 WorkCentre 6400 Service Manual

Theory of Operation

The Exit Rollers in the Duplex Unit transport the 1-sided printed page into the
Duplex Unit in a reverse direction.

Reverse Drive Mechanism

Duplex Reverse Motor (M9)

Transport Drive Mechanism

s6400mfp-205

Reverse Motor Control

The signal output from the AD Control Board is used to control rotation of the
Duplex Reverse Motor (M9).

Paper Transport and Duplex Paper Feed

The Duplex Transport Motor (M8) receives signal from the AD Control Board
and provides drive energy for the Duplex Unit.

Duplex Transport Motor (M8)

Transport Roller 1
Transport Roll 1

Transport Roll 2
Transport Roller 2
s6400mfp-209

WorkCentre 6400 Service Manual 2-107

Theory of Operation

Duplex 2-Sided Printing Method

Two types of 2-sided printing are available.

■ 2-sided printing with a single sheet of paper (Legal)

■ 2-sided printing with two sheets of paper (for letter and smaller sizes)

2-Sided Printing (Single Sheet) Process

1. A sheet of paper is fed and the second image of the print job is printed.
2. Just before the printed page moves past the Exit Roller, the direction of
the Exit Roller is reversed and the printed page is transported into the
Duplex Unit.

s6400mfp-656

3. The printed page is transported through the Duplex Unit and is stopped
briefly and then fed into the printer.
4. The first image of the print job is then printed on the page fed out of the
Duplex Unit.

3 4

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Theory of Operation

5. As the 2-sided printed page is being fed out of the printer, the fourth
image of the print job is printed on the second sheet of the paper.

s6400mfp-659

Note
Steps 2 through 5 are repeated until all pages of the job are printed.

WorkCentre 6400 Service Manual 2-109

Theory of Operation

2-Sided Printing (Two Sheets) Process

1. The first sheet of paper is fed in and the second image of the print job is
printed.
2. Just before the printed page moves past the Exit Roller, the direction of
the Exit Roller is reversed and the printed page is transported into the
Duplex Unit. The second sheet of paper is fed simultaneously from the
tray.

s6400mfp-656

3. The printed page is transported through the Duplex Unit. The fourth
image of the print job is printed on the second sheet of paper.

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Theory of Operation

4. Immediately before the second sheet of paper exits the Feed Roller, the
Feed Roller is reversed and the second sheet of paper is transported into
the Duplex Unit. The first sheet of paper is fed simultaneously into the
printer.

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5. The first of the print job is printed on the first sheet of paper as it is fed
again.

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6. The third image of the print job is printed on the second sheet of paper as
the first sheet of paper is discharged. The third sheet of paper is fed
simultaneously into the printer.

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WorkCentre 6400 Service Manual 2-111

Theory of Operation

7. As the second sheet of paper is fed out of the printer, the sixth image of
the print job is printed on the third sheet of paper. Steps 6 through 7 are
repeated until all pages of the job are printed.

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Theory of Operation

Optional 500-Sheet Feeder

The Optional 500-Sheet Feeder increases the input capacity of the printer. Up
to two 500-Sheet Feeders can be installed on a WorkCentre 6400.

Drive Mechanism

Paper Lift Plate Paper Level Indicator Lever

Optional 500-Sheet
Feeder Right Door

Back Stop

s6400mfp-222

Paper Feed Sensor Actuator

Paper Empty Sensor (PS22)

Empty Sensor Actuator

Size Detection Board Paper Feed Sensor (PS23)

Paper Size Switch (SW6) s6400mfp-224

Paper Feed Clutch (CL6)

Takeaway Roller

Feed Roller
Transport Motor (M1)
Separation Roller s6400mfp-225

WorkCentre 6400 Service Manual 2-113

Theory of Operation

Paper Feed Control

Paper Lift Plate Mechanism

Lock Release Lever

s6400mfp-227

The Paper Lift Plate is pressed down into the locked position.
Load paper into the tray, then slide the tray into the printer. This process
unlocks the Paper Lift Plate. The Paper Lift Plate and paper are pressed
against the Feed Roller. The Paper Lift Plate is pushed upward by the springs
at all times.

Springs

Paper Lift Plate s6400mfp-226

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Theory of Operation

Feed Roller/Separation Roller

1. The Transport Motor is energized to turn the Separation Roller.

2. The Paper Feed Clutch is energized to turn the Feed Roller.
3. The paper is fed in by the Feed Roller.
4. The paper fed in by the Feed Roller is transported onto the Vertical
Transport Roller of the printer by the Separation Roller.
5. When the Paper Feed Sensor is activated and then the paper is
transported onto a specified point in the paper path, the Paper Feed
Clutch is de-energized, thus bringing the Feed Roller to a stop. The
Separation Roller thereafter takes charge of transporting paper further.

Paper Feed Clutch (CL6)

Vertical Transport Rollers

Feed Roller
Transport Motor (M1)
Separation Roller s6400mfp-228

6. When the trailing edge of the last sheet of paper moves past the
Registration Sensor, the Transport Motor is de-energized to bring the
Separation Roller to a stop.

Transport Motor (M1) Energized

De-energized

Paper Feed Clutch (CL6) Energized

De-energized

Paper Feed Sensor (PS23) Unblocked

Blocked
s6400mfp-229

WorkCentre 6400 Service Manual 2-115

Theory of Operation

Paper Separation Mechanism

A Separation Roller with a torque limiter is used to prevent multi-picking of

paper.

Feed Roller

Separation Roller

s6400mfp-230

Paper Detection Mechanism

The Paper Feed Sensor (PS23) detects the paper fed by the Feed Roller.
When two Optional 500-Sheet Feeders are installed, the sensor detects the
paper fed from Tray 3 as the Paper Feed Sensor Actuator unblocks the Paper
Feed Sensor.

Actuator

Paper Feed Sensor (PS23)

Paper (Tray 2) Paper (Tray 3/4) s6400mfp-231

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Theory of Operation

Paper Supply Level Detection

The Front Cover of the tray contains a window indicating the paper supply
level.
When the Paper Lift Plate goes up, a red lever appears in the window. The
lower the level of the paper stack in the tray, the more red lever is visible.

Paper Level
Indicator

A paper empty
condition

Paper Loaded
s6400mfp-233

Paper Lift Plate

Lever s6400mfp-232

WorkCentre 6400 Service Manual 2-117

Theory of Operation

Paper Empty Condition Detection

The paper empty message is displayed on the Control Panel when the Empty
Sensor Actuator unblocks the Paper Empty Sensor (PS22). Paper near empty
condition is not detected. The Paper Supply Level Indicator serves this
purpose.

Paper Loaded Actuator Paper Empty

Paper Empty Sensor (PS22)

Paper
Paper Lift Plate s6400mfp-234

Edge Guide Plate

The Edge Guide Plate can be adjusted to the exact size in the width direction
of the paper to be loaded.

Edge Guide
Plates

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Theory of Operation

Tray Backstop

The Tray Backstop can be adjusted to the exact length of the paper to be
loaded.

Tray Backstop

s6400mfp-236

Paper Size Detection

The Paper Size Switch detects the length of the paper.

1. The Size Detection Board turns as the Tray Back Stop is moved.
2. When the tray is inserted, the Tray Size Actuators press the Size Switches
in the printer.
3. The combination of On/Off positions of the sub-switches of the Paper Size
Switch determines the specific paper size. There are two different sizes
allowed.
4. If the tray is not pushed into position, all of the sub-switches are Off and
the insert tray message appears.

Paper Size Lower Feeder Paper Size Switch

SW1 SW2 SW3

Legal (8.5” x 14”) OFF ON ON

Government Legal Letter Plus ON ON ON
A4 ON ON OFF
Letter (8.5” x 11”) ON OFF OFF
B5 OFF OFF ON
Optional 500-Sheet Feeder Tray not OFF OFF OFF
installed

WorkCentre 6400 Service Manual 2-119

Theory of Operation

Paper Size Switch (MS1)

Actuator

Size Detection Arm

Tray Backstop

s6400mfp-237

Paper Misfeed Detection

If the Paper Feed Sensor is not activated within a specified period of time after
a paper feed sequence has been started, the printer determines that there is
a paper misfeed. It then displays a paper misfeed message on the Control
Panel.
The paper misfeed display can be reset by opening or closing any door.

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Theory of Operation

Finisher

The Finisher is a customer install option that adds stapling (up to 400 sheets),
and job stacking with offset (up to 500 sheets).

2 3

1
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1. Main Tray Section

2. Top Tray Section

3. Top Tray Transport Section

4. Storage Section

5. Staple Section

WorkCentre 6400 Service Manual 2-121

Theory of Operation

Paper Path

The paper path for feeding paper to the Main Tray and Top Tray are shown in
the illustrations below.
Paper Feed to the Main Tray

Feeding Paper Transporting Paper to the Transporting Paper

to the Main Tray Paper Aligning Section from the Printer

s6400mfp-240

Paper Feed to the Top Tray

Feeding Paper Transporting Paper to the Transporting Paper

to the Top Tray Finisher Transport Section from the Printer

s6400mfp-241

2-122 WorkCentre 6400 Service Manual

Theory of Operation

Paper Transport

Top Tray

Paper is transported from the Transport Unit to the Top Tray. The Transport
Motor provides drive energy to transport the paper.
The Transport Roller and Exit Roller rotated when the Transport Motor is
energized.

Exit Roller

Paper Full Sensor

Transport Roller

Transport Section Sensor (PS2)

Entrance Sensor (PS1) s6400mfp-264

The Entrance Sensor and the Transport Section Sensor detect paper in the
Top Tray Transport section.

Transport Section Sensor (PS2)

s6400mfp-265

WorkCentre 6400 Service Manual 2-123

Theory of Operation

Main Tray

The paper fed from the Transport Unit is transported to the Main Tray. The
Transport Motor and Exit Motor provide drive energy for paper transport. The
Entrance Sensor (PS1) and Storage Section Sensor (PS7) detect the paper.
1. The Transport Motor (M3) drives the Aligning Belt to transport the paper
to the Exit Roller.
2. The Exit Roller Up/Down Motor (M5) is energized to lower the Exit Roller.
3. The Transport Motor drives the Exit Roller. The Exit Roller and the
Aligning Belt then feed the paper to the Main Tray.

Exit Roller

Paper
Aligning Belt s6400mfp-275

Entrance Switch

Entrance Paper Guide

s6400mfp-263

WorkCentre 6400 Service Manual 2-125

Theory of Operation

Top Tray Transport

The Top Tray Transport section controls drive for transporting paper from the
Transport Unit to the Top Tray. The paper fed on the Top Tray does not go
through the shift or stapling process.

Top Tray

s6400mfp-258

Transport Motor (M3) Entrance Solenoid (SL1)

Entrance Paper Guide

Exit Roller

Transport Roller

s6400mfp-260

2-126 WorkCentre 6400 Service Manual

Theory of Operation

Paper Full Detection

The Paper Full Sensor detects the paper level in the Top Tray. When the
Paper Full Sensor Actuator is low, the edge of the Paper Full Sensor Actuator
covers the Paper Full Sensor (PS4).

Tray Empty Paper Full Sensor (PS4)

Paper Full Sensor Actuator

Top Tray
s6400mfp-267

When printing starts, the output paper pushes the Paper Full Sensor Actuator
upward and the edge of the actuator activates the Paper Full Sensor (PS4).
When the paper is removed, the Paper Full Sensor Actuator goes down and
the edge of the actuator covers the Paper Full Sensor. If the sensor is
covered, the printed paper has not reached the maximum load capacity.

Paper Processing
Paper

s6400mfp-268

If the sensor detects the Exit Tray is full, printing is stopped. The message on
the Control Panel is cleared when the output paper is removed from the Top
Tray, which again covers the Paper Full Sensor.

Tray Full
Paper

s6400mfp-269

WorkCentre 6400 Service Manual 2-127

Theory of Operation

Finisher Cover Open/ Close Detection

The Finisher Cover Sensor (PS3) detects the open or closed position of the
Finisher Cover. Opening the Finisher Cover unblocks the Finisher Cover
Sensor.

Finsher Cover Sensor (PS3)

s6400mfp-270

Finisher Cover
Sensor (PS3)

s6400mfp-271

2-128 WorkCentre 6400 Service Manual

Theory of Operation

Main Tray Transport

The Main Tray Transport controls drive for transporting the paper from the
Transport Unit to the Main Tray and for offsetting and stapling operations
performed on the paper from the Transport Unit.

s6400mfp-272

Exit Roller Up/Down Motor (M5)

Transport Motors (M3)

Exit Roller

Transport Roller
Aligning Belt

s6400mfp-273

WorkCentre 6400 Service Manual 2-129

Theory of Operation

Upper Exit Roller Up/ Down Motion Mechanism

The Upper Exit Roller is lowered when the paper is fed to the Main Tray or the
Top Tray.

Exit Roller Up/Down Motor (M5) s6400mfp-276

When a printed stack/set is fed out, the Upper Exit Roller is raised away from
the Lower Exit Roller, so that there is an unblocked paper path between the
Upper and Lower Exit Rollers.
The Upper Exit Roller is pressed against, or separated from the Lower Exit
Roller by drive energy provided the Exit Roller Up/Down Motor.

Pressed Separated

s6400mfp-277 s6400mfp-278

The Exit Roller Sensor detects the position of the Exit Roller.

Pressed Exit Roller Sensor Separated

s6400mfp-280
Exit Roller s6400mfp-279

2-130 WorkCentre 6400 Service Manual

Theory of Operation

Storage

Paper Aligning Mechanism

The printed paper stack/set is aligned and stapled together in the Storage
section before being fed out of the Main Tray. The Storage Sensor detects the
paper in the Storage Section.

s6400mfp-281

1. The Transport Motor (M3) drives the Aligning Belt, so that the paper is
transported up to the position of the Exit Roller.

Exit Roller
Up/Down Motor (M5)

Transport Motor (M3)

Exit Motor (M4)

Exit Roller

Transport Roller
Aligning Belt

s6400mfp-282

WorkCentre 6400 Service Manual 2-131

Theory of Operation

2. When the trailing edge of the paper moves past the Aligning Belt, the Exit
Roller Up/Down Motor starts rotating to lower the Upper Exit Roller. The
Aligning Plate is driven by the Align Motor (M2).

Exit Roller

Paper

Aligning Belt
s6400mfp-283

3. The Exit Motor (M4) rotates in the direction of the storing paper, causing
the Exit Roller to rotate in the direction of the storing paper.
The Exit Roller and Aligning Belt make the paper perform a switchback
operation, so that the paper is stored in the Finishing Tray.
The paper is pressed up against the Stopper to be aligned properly (in the
feeding direction).

Backwards Direction
Stopper
s6400mfp-284

2-132 WorkCentre 6400 Service Manual

Theory of Operation

4. When the paper is stored in place, the Exit Roller Up/Down Motor (M5)
starts rotating to raise the Upper Exit Roller.
5. The Aligning Belt Up/Down Solenoid is energized so that the Aligning Belt
is raised.
6. The Align Motor (M2) starts rotating to press the Aligning Plate up against
the paper. This aligns the paper properly (in the crosswise direction).
7. The Aligning Belt Up/Down Solenoid (SL3) is energized to lower the
Aligning Belt.
8. In Staple mode, the printed paper Stack/Set is stapled together after the
paper aligning sequence.

Aligning Plate

s6400mfp-285

Finishing Tray Paper Full Detection On Staple Mode

The number of printed pages that can be stored in the Finishing Tray on
Staple mode varies depending on the length of the paper.

Paper Length Plain Paper

300 mm or under 30 sheets

Over 300 mm 20 sheets

If the paper length is 300 mm or less, the count is taken when a job is received
from the printer. It is determined that the Finisher Tray capacity has been
reached when the count reaches 30.
If the paper length exceeds 300 mm, the count is taken when a job is received
from the printer. It is determined that the Finishing Tray capacity has been
reached when the count reaches 20.
If the maximum Finishing Tray capacity is reached in the middle of a print job,
the Staple Finisher forces the remaining sheets of paper out of the printer.

WorkCentre 6400 Service Manual 2-133

Theory of Operation

Aligning Belt Up/ Down Mechanism

Transport Motor (M3)

Aligning Belt Sensor (PS11)

Aligning Belt
Aligning Belt Up/Down Solenoid
s6400mfp-286

When the Aligning Plate and Paper Ejector are operated, the paper leaves the
Aligning Belt. The Aligning Belt is moved up or down through drive energy
from the Transport Motor (M3).

Ascent Descent

Aligning Belt
s6400mfp-287

2-134 WorkCentre 6400 Service Manual

Theory of Operation

The Aligning Belt Sensor (PS11) detects the movement of the Aligning Belt.
Descent tracks downward movement. Ascent tracks upward movement.

Aligning Belt Sensor (PS11)

Descent

Ascent

Aligning Belt Up/Down Solenoid (SL3)

s6400mfp-289

Aligning Plate Mechanism

The Aligning Plate is moved across to align the paper. Paper aligning is
completed by the Align Motor (M2) and the Aligning Plate.

Aligning Plates

The Aligning Plates are moved to the front or rear in accordance with the
paper size. The Aligning Plate Home Position Sensor (PS6) controls the
position of the Aligning Plate.

Aligning Plate

Stopper

Aligning Plate
Home Position
Sensor (PS6)

Align Motor (M2)

s6400mfp-290

WorkCentre 6400 Service Manual 2-135

Theory of Operation

Paper Aligning Sequence

In a mode in which the paper is fed straight out (without involving shift or
stapling operation), the paper is fed out centrally.
In the Shift/Stapling mode, the Aligning Plate pushes the paper about 30 mm
toward the front.

Aligning Plate

30 mm
Paper Feed
Direction
Center

Feeding Paper Straight Out Shift/Staple Mode s6400mfp-291

Exit Mechanism

The printed paper stack/set aligned in the storage section is fed out into the
Main Tray by the Paper Ejector. The Align Belt is moved up providing cleaning
for the Paper Ejector to move the media to the Main Tray. Once the paper is on
the Main Tray, the Paper Level Lever Solenoid activates the Paper Level Lever
determining the Main Tray is Full.
After the paper exits, the paddle rotates and tampered the paper into the tray.

Aligning Belt
Paper Ejector

Paddle
Paper Level Lever
Paper Level Sensor 1 (PS9)
Paper Level Sensor 2 (PS10)

Paper Level Lever

2-138 WorkCentre 6400 Service Manual

Theory of Operation

3. The Paper Level Lever Solenoid (SL2) is energized to retract the Paper
Level Lever.
4. The Paddle Solenoid (SL4) is energized to rotate the Paddle. The Paddle
feeds the paper out to the Main Tray.
5. The Paper Ejector Motor (M1) is rotated backward to move the Paper
Ejector toward its home position.

Paddle

Paper Level Lever

Paper Ejector Motor (M1)

Paper Level Lever Solenoid (SL2) s6400mfp-297

6. The Paper Level Lever Solenoid (SL2) is energized to advance the Paper
Level Lever to a position above the paper.
7. When the Paper Ejector blocks the Paper Ejector Sensor (PS5), the
Paper Eject Motor (M1) is de-energized.
8. The Aligning Belt Up/Down Solenoid (SL3) is energized to lower the
Aligning Belt.

Paper Ejector Sensor (PS5)

Paper Ejector
Motor (M1)

Paper Level Lever Solenoid (SL2)

s6400mfp-298

WorkCentre 6400 Service Manual 2-139

Theory of Operation

Paper Ejector Mechanism

The printed paper stack/set stored in the Finishing Tray is fed out to the Main
Tray.

Paper Paper Ejector Sensor (PS5)

Paper Ejector

Paper Ejector Motor (M1) s6400mfp-299

The Paper Ejector is advanced or retracted by drive energy from the Paper
Ejector Motor (M1).

Paper Ejector Motor (M1)

s6400mfp-294

2-140 WorkCentre 6400 Service Manual

Theory of Operation

Rotation of the Paper Ejector Motor (M1) in the forward direction causes the
Paper Ejector Belt to rotate in the forward direction. This causes the Paper
Ejector to advance (or move in the direction of feeding the paper stack/set
out).
Rotation of the Paper Ejector Motor (M1) in the backward direction causes the
Paper Ejector Belt to rotate backward. This causes the Paper Ejector to
retract (or move toward the home position).

Paper

Paper Ejector
(Paddle)

Backward Direction s6400mfp-300

The Paper Ejector Sensor (PS5) detects the Paper Ejector at its home
position.

Paper Ejector Sensor (PS5)

s6400mfp-301

WorkCentre 6400 Service Manual 2-141

Theory of Operation

Main Tray

The Tray Full Sensor (PS4) controls the paper level and detection of a paper
full condition in order to accommodate properly paper fed out of the Finisher.

s6400mfp-302

Paper Level Sensor 2 (PS10)

Paper Holding Mechanism

The Paper Level Lever holds the paper down on the Main Tray while printed
paper stacks/sets are fed out (except for the Stapling mode), thereby
preventing the paper stacks/sets which have previously been fed onto the
printer from being pushed out and dropped by a new paper stack/set being
fed out.
The subsequent stack/set of printed paper is fed out with the preceding stack/
set of printed paper held down by the Paper Level Lever.

Paper

Paper Level Lever

s6400mfp-309

Paper Level Lever s6400mfp-310

WorkCentre 6400 Service Manual 2-145

Theory of Operation

Paper Full Detection

The Paper Level Sensor 1 (PS9), Paper Level Sensor 2 (PS10), and the Tray
4 Sensor (PS13) detect the amount of paper transport to the Main Tray.
When the corresponding sensor detects either condition 1 or 2 described in
the provided table, the Finisher determines that the maximum capacity of the
printed paper on the Main Tray has been reached and display the message on
the Control Panel.

Paper Level Paper Level Lower Tray

Conditions Evaluation
Sensor 1 Sensor 2 Sensor

1 Unblocked Blocked Blocked Paper full

2 Unblocked Unblocked Blocked

If the sensor detects that the Main Tray is full, printing is stopped. The error
message is cleared when the paper is removed from the Main Tray.

2-146 WorkCentre 6400 Service Manual

Theory of Operation

Stapling Unit

The Stapling Unit is accessed by opening the Finisher Front Door.

s6400mfp-311

s6400mfp-312

WorkCentre 6400 Service Manual 2-147

Theory of Operation

Stapling Mechanism

Stapling is performed by the Stapling Unit. When the Stapling Motor is

rotated, the clinch arm lowers. The Stapler goes up to drive a staple in the
paper.
Stapling is performed at one point at the rear corner of the paper stack/set.

Clinch Arm
Stapling Unit

Stapling Motor
s6400mfp-313

Stapling Position

When the Finisher is mounted on the printer, the printed paper is fed out face
down with its trailing edge first. The staple is driven into the paper stacker/set
at an angle of 49° relative to the printed surface at the rear corner.

Typical Staple Position

s6400mfp-314

2-148 WorkCentre 6400 Service Manual

Theory of Operation

Staple Sheet Empty Detection

Staple Empty Detection Sensor 1, 2 detect whether or not there is a staple

sheet still left. When there are about 20 staples left in the Staple Cartridge, a
staple cartridge empty condition occurs, causing a corresponding empty
message to appear on the Control Panel.
When the empty condition is detected, the corresponding empty indication is
displayed on the Control Panel. At the same time, the Stapling unit moves to
the front.
When a new Staple Cartridge is loaded, the Stapling Motor is energized until
the priming sensor detects a staple, which results in the staple to be fed up to
the stapling position.

Self-Priming Sensor 1, 2
Staple Empty Detection Sensor 1, 2 s6400mfp-315

WorkCentre 6400 Service Manual 2-149

Theory of Operation

2-150 WorkCentre 6400 Service Manual

Error Messages and
Codes
In this chapter...
■ Introduction
■ Servicing Instructions
■ Messages, Chain Link Codes, and Procedures
■ Fault Codes
■ Status Messages

Chapter
3
Error Messages and Codes

Introduction

This chapter describes error message and fault codes displayed in fault
history on the control panel. These error indications serve as the entry point
into the troubleshooting process.
Troubleshooting of problems not directly indicated by or associated with an
error message or fault code is covered in “General Troubleshooting” on
page 4-1. Print quality problems are covered in “Print-Quality
Troubleshooting” on page 5-1.
The printer tracks and reports errors in a number of ways. The two types of
error reporting discussed in this section include:

■ Error messages displayed on the control panel or in current messages

and current faults.

■ Fatal printer errors and jam errors listed within machine status in fault
history on the control panel.

System Status Embedded Page

The System Status/ Fault History page is a multiple page document. Page
one includes counters, current temperature and humidity, and some test
patterns for color registration. Page two is a list of the most recent faults that
have occurred giving the error code, date, time, and page count at the time
they happened.

Note
The Image Count (Machine Status -> Faults -> Fault History) is the
Total images between service calls, not total impressions.

Accessing System Status/ Fault History Report

Customer Menu

1. Press the Log In/Out button.

2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. On the Control Panel, press the Machine Status button.
7. On the UI screen, touch the Tools tab.
8. Touch the Troubleshooting button.
9. Under the Features screen, select Support Pages.
10. On the Support Pages screen, select System Status Page.
11. Touch the Print button to print the System Status Page report.
12. The System Status Page report includes:
■ System Status
■ Fault History

3-2 WorkCentre 6400 Service Manual

Error Messages and Codes

13. Touch the Close button to exit the Support Pages screen.

Status Messages and Faults

The current status and fault history of the printer can be viewed using the
faults tab in machine status.

Accessing Fault and Status Messages on the UI

1. From the printer’s Control Panel, press the Machine Status button.
2. Touch the Faults tab.
3. Choose the appropriate button to access the current faults, current
messages or fault history.

Current Faults

The current faults lists the displayed status messages on the control panel.

Current Messages

The current messages lists the displayed status messages on the control
panel that have an associated pop up window. To view the pop up window,
highlight a status message then touch the instruction button.

Fault History

The Fault History lists the most recent printer fault codes with a time and date
stamp. Use the fault code to determine the appropriate trouble shooting
procedure to correct printer problems.

WorkCentre 6400 Service Manual 3-3

Error Messages and Codes

Servicing Instructions

The service checklist below is an overview of the path a service technician

should take when servicing the printer and printer optional equipment.

Service Checklist

Step 1: Identify the Problem

1. Verify the reported problem does exist.
2. Check for any error codes and write them down.
3. Print normal customer prints and service test prints.
4. Make note of any print-quality problems in the test prints.
5. Make note of any mechanical or electrical abnormalities present.
6. Make note of any unusual noise or smell coming from the printer.
7. Print the system status embedded page to view the printer parameters and
fault history (last 40 faults).
8. Verify the AC input power supply is within proper specifications by
measuring the voltage at the electric outlet while the printer is running.
Step 2: Inspect and Clean the Printer
1. Turn the printer power Off.
2. Disconnect the AC power cord from the wall outlet.
3. Verify the power cord is free from damage or short circuit and is connected
properly.
4. Remove the Toner Cartridge.
5. Remove the Imaging Units and protect them from light.
6. Remove the Transfer Belt.
7. Inspect the printer interior and remove any debris such as pieces of paper,
dust, or loose toner.
8. Clean each laser lens.
9. Do not use solvents or chemical cleaners to clean the printer interior.
10.Do not use any type of oil or lubricant on printer parts.
11.Use only an approved toner vacuum.
12.Clean all rubber rollers with a lint-free cloth, dampened slightly with cold
water and mild detergent.
13.Inspect the interior of the printer for damaged wires, loose connections,
toner leakage, and damaged or obviously worn parts.
14.If the Toner Cartridges appear obviously damaged, replace with new ones.
Step 3: Find the Cause of the Problem
1. Use the Error Messages and Codes and troubleshooting procedures to find
the cause of the problem.
2. Use Service Diagnostics to check the printer and optional components.
3. Use the Wiring Diagrams and Plug/Jack Locator to locate test points.
4. Take voltage readings as instructed in the appropriate troubleshooting
procedure.
Step 4: Correct the Problem
1. Use the Parts List to locate a part number.
2. Use the FRU Disassembly procedures to replace the part.

3-4 WorkCentre 6400 Service Manual

Error Messages and Codes

Service Checklist (continued)

Step 5: Final Checkout

1. Test the printer to be sure you have corrected the initial problem and there
are no additional problems present.

WorkCentre 6400 Service Manual 3-5

Error Messages and Codes

Messages, Chain Link Codes, and Procedures

The error messages and chain link codes generated by the printer’s operating
system are the lead-in to the troubleshooting procedures that follow in
subsequent pages. This section correlates the output of the printer’s
diagnostic aids and provides the troubleshooting procedures to locate and
correct the reported errors.

Fault Codes Summary

Soft Faults

Soft faults are events that occur within the system and, in most cases cause
no disruption to the operation of the printer. The system automatically
recovers from these events and no action is required by service. Soft fault
events are viewable in Diagnostics dc102 fault counters only.

Hard Faults

Hard faults are events that occur within the system that shut down one or
more functions within the printer and require service for corrective action.
Hard faults are logged in the Machine Status/ Faults Tab and Diagnostics
dc122 Fault History. A printable version of the fault log is available in the
System Status Embedded Page.
The Fault Codes Summary table lists possible errors, along with the
corresponding code, and page reference for the corrective procedure.

■ The fault codes column lists the codes displayed in fault history.

■ The Fault Description column shows the message as it appears on the

printer’s Control Panel.

■ The Page column references the procedure related to the error.

Use this table to identify the proper procedure to correct the reported error.

Fault Code Display

Fault Code Fault Description Page

Reference the comprehensive fault code list in Appendix A (page A-1) for any fault
code not found in this section.

301 - Main Power/ Standby Power/ Interlocks

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.
301.510.00 The Front Door is Open page 3-13

302 - System Controller/ UI

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

302.302.00 All LED’s are Blinking page 3-15

3-6 WorkCentre 6400 Service Manual

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

302.306.00 All LED’s are Blinking page 3-15
302.308.00 All LED’s are Blinking page 3-15
302.315.00 Invalid Service Registry page 3-17
302.316.00 Invalid Service Registry page 3-17
302.317.00 Invalid Service Registry page 3-17
302.320.00 Invalid Service Registry page 3-17
302.321.00 Extensible Services are not available page 3-18
302.390.00 Invalid Service Registry page 3-17

303 - Machine Run Control

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

303.301.00 System Fault page 3-19

303.302.00 System Fault page 3-19
303.303.00 System Fault page 3-20
303.304.00 Image Disk is Offline page 3-21
303.305.00 System Fault page 3-23
303.308.00 System Fault page 3-23
303.310.00 Unknown Printer Error page 3-24
303.316.00 System Fault page 3-25
303.317.00 IOT NVM Error page 3-26
303.318.00 IOT NVM Error page 3-26
303.319.00 IOT NVM Error page 3-26
303.325.00 System Fault page 3-27
303.330.00 Upgrade Failure page 3-28
303.338.00 Software Reset page 3-29
303.355.00 System Fault page 3-30
303.401.00 Fax Service Error page 3-31
303.789.00 NVM Autosave Error page 3-32

304 - Machine Main Drive/ Start Print Power

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.
304.001.00 System Fault page 3-33
304.002.00 System Fault page 3-35
304.003.00 Finisher Error page 3-36
304.486.00 Paper Jam at the Output Tray page 3-37

WorkCentre 6400 Service Manual 3-7

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

305 - Document Transport

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

305.161.00 Paper Jam in the Document Feeder page 3-39

305.162.00 Paper Jam in the Document Feeder page 3-39
305.163.00 Paper Jam in the Document Feeder page 3-39
305.164.00 Paper Jam in the Document Feeder page 3-39
305.165.00 Scanner Fault page 3-41
305.166.00 Scanner Fault page 3-41
305.167.00 Scanner Fault page 3-43
305.168.00 Scanner Fault page 3-41
305.169.00 System Fault page 3-44
305.194.00 Document Feeder is not Available page 3-45
305.196.00 Document Feeder is not Available page 3-45
305.197.00 Document Feeder is not Available page 3-45
305.274.00 Document Feeder is not Available page 3-45

308 - Paper Feed & Transport

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

308.001.00 System Fault page 3-46

308.002.00 System Fault page 3-49
308.101.00 Misfeed in Tray 1 page 3-51
308.102.00 Misfeed in Tray 2 page 3-53
308.103.00 Misfeed in Tray 2 page 3-53
308.104.00 Misfeed in Tray 3/4 page 3-56
308.105.00 Paper Jam Behind the Duplex Door/ Feed Area page 3-59

309 - Xerographics/ Markings

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

309.001.00 Xerographic System Error page 3-61

309.002.00 Xerographic System Error page 3-61
309.003.00 Xerographic System Error page 3-63
309.004.00 Xerographic System Error page 3-65
309.005.00 Xerographic System Error page 3-68
309.006.00 Xerographic System Error page 3-70
309.007.00 Xerographic System Error page 3-72
309.008.00 Xerographic System Error page 3-72

3-8 WorkCentre 6400 Service Manual

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

309.009.00 Xerographic System Error page 3-72
309.010.00 Xerographic System Error page 3-72
309.011.00 Auto Calibration Failed page 3-73
309.012.00 Auto Calibration Failed page 3-73
309.013.00 Auto Calibration Failed page 3-73
309.014.00 Auto Calibration Failed page 3-73

310 - IOT (Fuser/ Fixing and Post Fix Transport)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

310.102.00 Paper Jam Under the Control Panel page 3-75

310.103.00 Paper Jam Behind the Right Side Door page 3-78
310.104.00 Paper Jam Behind the Duplex Door/ Feed Area page 3-59
310.105.00 Paper Jam Behind the Right Side Door page 3-78
310.106.00 Paper Jam Behind the Right Side Door page 3-81
310.301.00 Fuser System Error page 3-84
310.302.00 Fuser System Error page 3-84
310.303.00 Fuser System Error page 3-84
310.304.00 Fuser System Error page 3-84
310.305.00 Fuser System Error page 3-84
310.306.00 Fuser System Error page 3-84
310.307.00 Fuser System Error page 3-86
310.308.00 Fuser System Error page 3-87

312 - Finisher
Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.
312.098.00 Finisher Error page 3-90
312.099.00 Finisher Error page 3-92
312.480.00 Finisher Error page 3-94
312.481.00 Finisher Error page 3-96
312.482.00 Finisher Error page 3-98
312.483.00 Finisher Error page 3-100
312.484.00 Finisher Error page 3-102
312.485.00 Finisher Error page 3-104
312.487.00 Paper Jam in the Finisher Transport Area page 3-106
312.488.00 Paper Jam at Finisher Top Output Tray page 3-108
312.489.00 Paper Jam at Finisher Main Output Tray page 3-110

WorkCentre 6400 Service Manual 3-9

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

312.491.00 Staple Jam in the Finisher page 3-112

314 - Raster Input Scanner (RIS)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

314.001.00 Scanner Fault page 3-41

314-002.00 Scanner Fault page 3-114
314.003.00 Scanner Fault page 3-43
314.004.00 Paper Jam in the Document Feeder page 3-39
314.005.00 Document Feeder (DADF) Disconnected page 3-116

315 - Image Processing Subsystem (IPS)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

315.007.00 Scanner Fault page 3-41

315.008.00 Scanner Fault page 3-41
315.009.00 Scanner Fault page 3-117
315.010.00 Scanner Fault page 3-117
315.011.00 Scanner Fault page 3-117
315.012.00 Scanner Fault page 3-117

316 - Network Controller (for Back End)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

316.xxx.xx Internal Communication Error page 3-119

316.xxx.xx Network Controller Internal Error page 3-121

319 - Video Image Manipulation

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

319.300.00 Image Disk is Offline page 3-21

319.301.00 Image Disk is Offline page 3-21
319.302.00 Image Disk is Offline page 3-21
319.303.00 Image Disk is Offline page 3-21
319.310.00 Image Disk is Offline page 3-21
319.403.00 Out of Memory page 3-123

320 - Fax
Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.
320.302.00 Fax Services Cannot Register/ Unregister page 3-124
320.303.00 Fax Services Cannot Register/ Unregister page 3-124
320.305.00 Fax Services Cannot Register/ Unregister page 3-124

3-10 WorkCentre 6400 Service Manual

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

320.320.00 A Fax Memory Error has Occurred page 3-125
320.322.00 A Fax Memory Error has Occurred page 3-125
320.323.00 A Fax Memory Error has Occurred page 3-125
320.324.00 A Fax Memory Error has Occurred page 3-125
320.327.00 A Fax Memory Error has Occurred page 3-125
320.331.00 Fax Line 1 Unavailable or No Dial Tone Detected page 3-127
320.338.00 Fax Line 1 Unavailable or No Dial Tone Detected page 3-127
320.339.00 A Fax Memory Error has Occurred page 3-125
320.341.00 A Fax Memory Error has Occurred page 3-125
320.342.00 A Fax Memory Error has Occurred page 3-125
320.350.00 Fax Line 1 Unavailable or No Dial Tone Detected page 3-127
320.351.00 Fax Line 1 Unavailable or No Dial Tone Detected page 3-127
320.701.00 Fax Services Cannot Register/ Unregister page 3-124

322 - System Controller (DC Software)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

322.370.00 Network Controller Error page 3-129

322.371.00 Fax Services Cannot Register/ Unregister page 3-124
322.372.00 Fax Services Cannot Register/ Unregister page 3-124
322.750.00 Output Device Configuration Mismatch page 3-130

342 - IOT
Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

342.045.00 System Fault page 3-131

362 - IIT
Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

362.310.00 Scanner Fault page 3-114

377 - IOT (Paper Trays)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

377.305.00 Tray 3 or Tray 4 Right Side Door is Open page 3-132

377.306.00 Tray 3 or Tray 4 Right Side Door is Open page 3-132
377.307.00 Close Duplex Door page 3-134
377.308.00 Close Finisher Top Cover page 3-136
377.309.00 Lower the Control Panel Door page 3-138
377.310.00 The Finisher Front Door is Open page 3-139

WorkCentre 6400 Service Manual 3-11

Error Messages and Codes

Fault Code Display (continued)

Fault Code Fault Description Page

377.311.00 Document Feeder Cover is Open page 3-141

377.312.00 The Right Side Door is Open page 3-142
377.313.00 Duplex Unit Error page 3-144
377.314.00 Tray 1 Assembly Error page 3-146

391 - IOT (Marking)

Note: Only hard fault codes are listed here. Reference the comprehensive fault code
list in Appendix A (page A-1) for any fault code not found in this section.

391-313-00 Xerographic System Error page 3-148

391-320-00 Xerographic System Error page 3-150

Status Message Summary

The Status Message Summary table lists possible errors and page references
for the corrective procedure.

■ The Status message column shows the message that is displayed in the
current faults tab, fault history report, and control panel.

■ The Page column references the procedure related to the fault.

Use this table to identify the proper procedure to correct the reported error.

Fault Message Display

Status Message Page

Note: Only status messages that require a procedure to troubleshoot are contained in
chapter 3. Reference Appendix A on page A-64 for a complete list of all status
messages and their corrective action.
Cyan, Magenta, Yellow, or Black Toner Cartridge is Missing or not page 3-152
Seated Properly
Finisher Main Tray is Full page 3-154
Finisher Top Tray is Full page 3-156
Fuser is Missing or Not Installed Correctly page 3-158
Install or Reseat Imaging Unit page 3-160
Non-Xerox Imaging Unit in Use page 3-162
Output Tray is Full (No Finisher) page 3-164
Tray 2 is Empty - Add Paper page 3-166
Tray 2 is Open page 3-168
Tray 3 or 4 is Empty - Add Paper page 3-170
Tray 3 or Tray 4 is Open page 3-172

3-12 WorkCentre 6400 Service Manual

Error Messages and Codes

Fault Codes

The Front Door is Open

The printer has reported that "The Front Door is Open". This message is
triggered when the front door Sensor (PS4) logic indicates the door is open.

Applicable Chain-Link Code

■ 301.510.00: Front Door is Open

Initial Actions

■ Open the Front Door and check for obstructions or physical damage.

■ Confirm the Toner Cartridges, Imaging Units, and Waste Cartridge are
installed and locked in place.

■ Inspect the Front Door for correct open/ close movement

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Front Cover Assy (Front Door), PL3.10
■ Front Door Sensor (PS4), PL6.10 077-303
■ MCU Board, PL20.09
■ Wire Harness, PL25.02

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Front Door Sensor in Go to step 2. Go to step 3.

Diagnostics.
Does the sensor state change?
2 Check the sensor flag on the Front Replace the Go to step 3.
Cover Assy (Front Door) for damage. Front Door
Is there damage noted? Assembly
(page 8-51).
3 Replace the Front Door Sensor PS4. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Is there continuity between Replace the MCU Replace the
PJ10MCU and PJ3 (PS4)? Board wiring harness,
(page 8-101). PL25.02.

WorkCentre 6400 Service Manual 3-13

Error Messages and Codes

3-14 WorkCentre 6400 Service Manual

Error Messages and Codes

All LED’s are Blinking

Applicable Chain-Link Codes

■ 302.302.00: Rewrite Failure

■ 302.306.00: Erase Failure

■ 302.308.00: Download Invalid

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the Image Processor Board with the 2 standoff screws.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Control Panel, PL2.12

■ UI Main PWB, PL2.14
■ Color LCD Module, PL2.16
■ Flat Cable, Video, PL2.17
■ Image Processor Board, PL20.07

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the problem still occur? complete.
2 Does the features button flash 6 Go to step 3. Replace the
times in a row? color LCD
Module
(page 8-75).
3 Is the Interface Cable connected to Go to step 4. Reseat the
JX301 on the Main Board? connector.
4 Is the Flat Cable, Video connected to Go to step 5. Reseat the
JX701 on the main board and CN1 on connector.
the LCD module?
5 Replace the Flat Cable, Video Go to step 6. Troubleshooting
(page 8-75). complete.
Does the error still occur?
6 Replace the Main PWB (page 8-75). Go to step 7. Troubleshooting
Does the error still occur? complete.

WorkCentre 6400 Service Manual 3-15

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

7 Replace the LCD Module Go to step 8. Troubleshooting
(page 8-75). complete.
Does the error still occur?
8 Replace the Control Panel Replace the Troubleshooting
(page 8-46). Image Processor complete.
Does the error still occur? Board
(page 8-98).

3-16 WorkCentre 6400 Service Manual

Error Messages and Codes

Invalid Service Registry

There is error with Service Registry.

Applicable Chain-Link Codes

■ 302.315.00: Service Registry bad or corrupted data

■ 302.316.00: SRS returns invalid or missing data

■ 302.317.00: LUI gets no response from SRS

■ 302.320.00: UI Data Time Out Error

■ 302.390.00: Config Services not stable

Initial Action

■ None

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are any of the error codes in the Confirm the Go to step 2.
customer accessible fault history error has been
recent? resolved.
2 Turn printer power Off, wait one Proceed to Troubleshooting
minute, turn printer power On. “Internal complete.
Does the problem still occur? Communication
Error” on
page 3-119 in
Chapter 3.

WorkCentre 6400 Service Manual 3-17

Error Messages and Codes

Extensible Services are not available

The XEIP browser is no longer communicating to the User Interface.

Applicable Chain-Link Code

■ 302.321.00: XEIP browser does not respond or is dead.

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Does the system boot to the ready Follow the Follow the USB
state? standard Altboot
software procedure in
upgrade Appendix A on
procedure. page A-4.

3-18 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

An error occurred during writing or erasing of the flash ROM.

Applicable Chain-Link Codes

■ 303.301.00: Engine Flash ROM (Write) Failure

■ 303.302.00: Engine Flash ROM (Erase) Failure

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Image Processor Board, PL20.07

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board connector Go to step 2. Properly seat the

(PJ24MCU) properly connected? connector.
2 Is the Image Processor Board Go to step 3. Properly seat the
connector (PJ401IP) properly connector.
connected?
3 Replace the MCU Board Replace the Troubleshooting
(page 8-101). Image Processor complete.
Does the error still occur? Board
(page 8-98).

WorkCentre 6400 Service Manual 3-19

Error Messages and Codes

System Fault

An internal communication error occurred within the MCU board.

Applicable Chain-Link Code

■ 303.303.00: Engine Board Failure

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are all the connectors to the MCU Replace the MCU Properly seat all
Board properly connected? Board the connectors.
(page 8-101).

3-20 WorkCentre 6400 Service Manual

Error Messages and Codes

Image Disk is Offline

The printer has detected a Disk Drive access failure. The image disks (Copy
Controller or Network Controller Hard Drive) cannot read or write.

Applicable Chain-Link Codes

■ 303.304.00: Disk Failure

■ 319.300.00: Unable to read from Image Disk

■ 319.301.00: Unable to write to Image Disk

■ 319.302.00: Bad data received from Disk

■ 319.303.00: Unable to format Image Disk

■ 319.310.00: Disk system capacity fault

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Copy Controller (CC) Hard Drive, PL20.03

■ Network Controller (NC) Hard Drive, PL20.03
■ Hard Drive Cable, PL20.46

Note
For assistance performing the Power On Self Test, refer to “POST LED’s”
on page 4-5 of the General Troubleshooting in Chapter 4.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are the NC and CC Hard Drive cables Go to step 2. Reseat or

correctly seated and undamaged? replace the
affected cable.
2 Test the functionality of the NC and Replace the Troubleshooting
CC Hard Drives by running the Power affected part. complete.
On Self Test (POST) Diagnostics.
Do the POST Diagnostics results
identify a defective component?

WorkCentre 6400 Service Manual 3-21

Error Messages and Codes

Image P/J205
Processor 1 NC Hard
Board Drive
(IP)
4
P/J402
1

P/J206
1 CC Hard
Drive
4
P/J602
1 SATA
Daughter
Board
7
s6400mfp-928

3-22 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The printer has detected an engine NVRAM failure within the MCU Board.

Applicable Chain-Link Codes

■ 303.305.00: Engine NVRAM Failure 1

■ 303.308.00: Engine NVRAM Failure 2

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board installed correctly Go to step 2. Reinstall the

and are all connector s properly MCU Board or
seated? reseat the
connectors.
2 Is the Engine NVRAM chip (IC4) Replace the MCU Reseat the
installed correctly and fully seated on Board NVRAM chip.
the MCU Board? (page 8-101).

WorkCentre 6400 Service Manual 3-23

Error Messages and Codes

Unknown Printer Error

There is error on the printer.

Applicable Chain-Link Code

■ 303.310.00: Error, Cause Unknown

Initial Action

■ None

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are any of the error codes in the Confirm the Go to step 2.

customer accessible fault history error has been
recent? resolved.
2 Turn printer power off, wait one Proceed to Troubleshooting
minute, turn printer power on. “Internal complete.
Does the problem still occur? Communication
Error” on
page 3-119 in
Chapter 3.

3-24 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The Copy Controller Module (CCM) cannot communicate with the Image
Output Terminal (IOT).

Applicable Chain-Link Code

■ 303.316.00: Communication Fault

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Image Processor Board, PL20.07

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Is the ribbon cable from the MCU Go to step 3. Properly seat the
board (PJ24MCU) to the Image ribbon cable and
Processor Board (PJ401IP) seated connector locks.
with the connector locks in place?
3 Replace the MCU Board Replace the Troubleshooting
(page 8-101). Image Processor complete.
Does the error still occur? Board
(page 8-98).

WorkCentre 6400 Service Manual 3-25

Error Messages and Codes

IOT NVM Error

An error occurred while the IOT NVM was initializing, saving, or restoring.

Applicable Chain-Link Codes

■ 303.317.00: Error saving critical IOT NVM

■ 303.318.00: Error initializing IOT NVM

■ 303.319.00: Error restoring critical IOT NVM

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Restore the NVM values using Go to step 2. Troubleshooting

dc361 (page 6-8) with the auto save complete.
file from yesterday.
Does the error still occur?
2 Upgrade the printer using a Troubleshooting Go to step 3.
standard method. complete.
Did the upgrade procedure complete
successfully?
3 Replace the MCU Board Upgrade the Troubleshooting
(page 8-101). printer using the complete.
Does the error still occur? AltBoot method
(page A-4) in
Appendix A.

3-26 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The system has detected that the Image Processor Board internal clock has
not increased within 1.5 seconds during Power On.

Applicable Chain-Link Code

■ 303.325.00: Wall Clock Fault

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Image Processor Board, PL20.07

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Replace the Troubleshooting

Does the error still occur? Image Processor complete.
Board
(page 8-98).

WorkCentre 6400 Service Manual 3-27

Error Messages and Codes

Upgrade Failure

An upgrade request was received while a security function was active.

Applicable Chain-Link Code

■ 303.330.00: Upgrade failed - Security Feature Active

Initial Actions

■ Wait until the Security function (Image Overwrite) is complete.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Upgrade the printer using a Troubleshooting Upgrade the

standard method. complete. printer using the
Did the upgrade procedure complete AltBoot method
successfully? (page A-4) in
Appendix A.

3-28 WorkCentre 6400 Service Manual

Error Messages and Codes

Software Reset

System detects that the Main Controller on CCM has been reset because
either the watch dog timer timed out or because the application SW wrote to
an illegal address.

Applicable Chain-Link Code

■ 303.338.00: CCM Reset

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Do any other devices on the network Setup the printer Properly seat the
have the same IP address? so it has a connector.
unique IP
address.
2 In Diagnostic function dc361 Go to step 3. Troubleshooting
(page 6-8), restore the most current complete.
NVM values to the NVM module.
Does the error still occur?
3 Does the system boot to the Ready Follow the Follow the USB
state? standard AltBoot
software procedure
upgrade (page A-4) in
procedure. Appendix A.

WorkCentre 6400 Service Manual 3-29

Error Messages and Codes

System Fault

Copy Controller Module POST failure detected during the NVM Integrity Test.

Applicable Chain-Link Code

■ 303.355.00: CCM POST failure. NVM battery may be dead.

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ NVM Module, PL20.43

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Is the Job Status LED blinking 7 Replace the NVM Go to step 3.
times in a row? Module
(page 8-116).
3 Perform dc361 (page 6-8) to restore Replace the NVM Troubleshooting
the NVM values from a current auto Module complete.
save file. (page 8-116).
Does the error still occur?

3-30 WorkCentre 6400 Service Manual

Error Messages and Codes

Fax Service Error

The Fax hardware is not detected.

Applicable Chain-Link Code

■ 303.401.00: Basic FAX not detected/ confirmed

Initial Actions

■ Power cycle the printer.

■ Confirm the printer configuration supports the fax feature (X or XF only).

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Image Processor Board, PL20.07

■ Fax Board, PL20.42

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 During power up sequence, does a Go to step 4. Go to step 2.

frame appear noting the Fax Board
is not detected?
2 Print a Configuration Report. Troubleshooting Go to step 3.
In the upper right hand corner, is it a complete.
model 6400S?
3 On the Configuration Report, verify Follow the Go to step 4.
the following: “Fax
■ Machine Hardware, Fax Card: Troubleshooting”
present on page 4-65 in
■ Software Versions, Fax: Has Chapter 4.
Version
■ Embedded Fax: installed/enabled

4 Are all 4 connections on the Fax Go to step 5. Properly align

Board properly aligned and installed and install the
on the Image Processor Board? Fax Board
(page 8-115).
5 Replace the Fax Board (page 8-115). Replace the Troubleshooting
Does the error still occur? Image Processor complete.
Board
(page 8-98).

WorkCentre 6400 Service Manual 3-31

Error Messages and Codes

NVM Autosave Error

The NVM auto save function encountered an error.

Applicable Chain-Link Code

■ 303.789.00: Error Autosaving Copy Controller NVM

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ CC HDD, PL20.03
■ NVM Module, PL20.43

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 In diagnostic function dc361 Go to step 2. Go to step 3.

(page 6-8), use Machine NVM to
store the current NVM values to the
CC HDD.
Did the values store successfully?
2 In dc 361 (page 6-8), restore the Troubleshooting Go to step 3.
most recent NVM values. complete.
Did the values restore successfully?
3 In dc361 (page 6-8), restore the Go to step 4. Go to step 5.
NVM values from yesterday.
Did the values restore successfully?
4 In dc361 (page 6-8), store the NVM Troubleshooting Go to step 5.
values to the CC HDD. complete.
Did the values store successfully?
5 Replace the CC HDD (page 8-91). Replace the NVM Troubleshooting
Does the error still occur? Module complete.
(page 8-116).

3-32 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The Ozone Ventilation Fan (FM13) does not rotate consistently after a given
period of time while it is being started or the motor lock signal remains high for
a given period of time while the Ozone Ventilation fan is being rotated.

Applicable Chain-Link Code

■ 304.001.00: Ozone Fan Failure

Initial Actions

■ Check the Ozone Filter for build-up.

■ Check the Ozone Ventilation Fan Motor for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Ozone Ventilation Fan, PL7.20 042-043

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Fan work in Diagnostics? Replace the Go to step 2.

Ozone
Ventilation Fan
(page 8-146).
2 Is the MCU Board connector Go to step 3. Properly seat the
(PJ6MCU) properly connected? connector.
3 Is the Ozone Ventilation Fan Go to step 4. Properly seat the
connector (CN13) properly connector.
connected?
4 With the Fan turned On in Replace the Replace the MCU
Diagnostics, is the following voltage Ozone Board
present? Ventilation Fan (page 8-101).
■ PJ6MCU-5 = 24Vdc (page 8-146).

WorkCentre 6400 Service Manual 3-33

Error Messages and Codes

Engine Control
Board
(MCU)
Interlock
+24VDC

P/J6 CN11
+24VDC CL3
1 2
2 CL3_ON 1 Paper Feed Clutch 1
CN12
+24VDC
3 2 CL1
4 CL1_ON 1 Paper Feed Clutch 2
CN13
FM13_ON
5 3 FM13
GND
6 2 Exhaust Fan Motor
FM13_LOCK
7 1
s6400mfp-556

3-34 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The DC Power Supply Fan (FM11) does not rotate consistently after a given
period of time while it is being started or the motor lock signal remains high for
a given period of time while the LVPS Cooling Fan is being rotated.

Applicable Chain-Link Code

■ 304.002.00: Power Supply (LVPS) Fan Failure

Initial Actions

■ Check the LVPS Cooling Fan for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Cooling Fan, PL13.02 042-051

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board connector Go to step 2. Properly seat the

(PJ9MCU) properly connected? connector.
2 With the Fan turned On in Replace the DC Replace the MCU
Diagnostics, is the following voltage Power Supply Board
present? Fan (page 8-101).
■ PJ9MCU-1 = 24Vdc (page 8-148).

Engine Control
Board
(MCU) P/J9
FM11_ON
1 FM11
GND
2 DC Power Supply
FM11_LOCK
3 Fan Motor
s6400mfp-538

WorkCentre 6400 Service Manual 3-35

Error Messages and Codes

Finisher Error

The Fan Motor (FM1) lock signal remains HIGH for a given period of time
while the fan is energized.

Applicable Chain-Link Code

■ 304.003.00: Finisher Fan Failure

Initial Actions

■ Check the Fan Motor for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Control Board, PL46.16

■ Fan Motor, PL46.24 012-120

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the FSC Board connector Go to step 2. Properly seat the

(CN13FSCB) properly connected? connector.
2 Is the Fan Motor connector (CN5) Go to step 3. Properly seat the
properly connected? connector.
3 Is the following voltage present? Replace the Fan Replace the
■ CN13FSCB-1 = 24Vdc Motor Finisher Control
(page 8-212). Board
(page 8-205).

Finisher
Control Board
CN13
(FSCB)
5 NC
4 NC CN5
+24VDC GND
3 1
2
FM1_LOCK
2
FM1
1
+24VDC
3 Fan Motor
s6400mfp-567

3-36 WorkCentre 6400 Service Manual

Error Messages and Codes

Paper Jam at the Output Tray

The Exit Sensor (PS15) was not unblocked after a given amount of time after
the paper has blocked the Exit Sensor (PS15).

Applicable Chain-Link Code

■ 304.486.00: Jam at Output Tray (No Finisher)

Initial Actions

■ Open the Front Door and lift the Control Panel to check the Horizontal
Transport area for any obstructions, paper, damage, or debris.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Check the Exit Sensor Actuator for proper function and obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Horizontal Transport - Upper, PL17.37

■ Horizontal Transport - Lower, PL17.48
■ Exit Sensor, PL19.13 010-205
■ MCU Board, PL20.09
■ Duplex Reverse Motor, PL22.13 077-020

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Guide Assembly, PL17.37 excessively worn
■ Guide Assembly, PL17.48 parts.
■ Actuator, PL19.09

2 Does the Exit Sensor work properly Go to step 6. Go to step 3.

in Diagnostics?
3 Are the Exit Sensor connectors Go to step 4. Properly seat the
(CN_Exit & CN_Exit1) properly connectors.
connected?
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ36MCU) properly connected? connectors.
5 Is the following voltage present? Replace the Exit Replace the MCU
■ PJ36MCU-1 = 5Vdc Sensor. Board
(page 8-101).

WorkCentre 6400 Service Manual 3-37

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Does the Duplex Reverse Motor work Replace the MCU Replace the
properly in Diagnostics? Board Duplex Reverse
(page 8-101). Motor
(page 8-174).

Engine Control
Board (MCU)
+5VDC
P/J36 CN_EXIT CN_EXIT1
+5VDC
1 6 3 PS15
GND
2 5 2 Exit
PS15_ON
3 4 1 Sensor 2
CN_EXIT2
+5VDC
4 3 3 PS14
GND
5 2 2 Paper Full
PS14_ON
6 1 1 Sensor
s6400mfp-929

3-38 WorkCentre 6400 Service Manual

Error Messages and Codes

Paper Jam in the Document Feeder

A jam has occurred while scanning paper through the Document Feeder.

Applicable Chain-Link Codes

■ 305.161.00: Jam at Document Feeder

■ 305.162.00: Jam at Document Feeder (Output)

■ 305.163.00: Jam at Document Feeder (Duplex)

■ 305.164.00: Jam at Document Feeder (Misfeed)

■ 314.004.00: Pick Up Roller Error

Initial Actions

■ Verify the media size and type is supported for use with the Document
Feeder.

■ Verify the media is not wrinkled, the corners are not curled, and is free of
staples and paper clips.

■ Check the DADF Separator Roller and Pads for damage and clean as
necessary.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ DADF Roller Kit Assembly, PL1.03

■ DADF Top Cover Assembly, PL1.05 005-103, 005-104, 005-105, 005-108
■ DADF Assembly, PL1.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Separator Pad Assembly, PL1.01 excessively worn
■ Separator Roller Assembly, PL1.02 parts.
■ Holder Assembly, PL1.07

■ Holder Assembly, PL1.08

WorkCentre 6400 Service Manual 3-39

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 Do the following sensors work Go to step 4. Go to step 3.
properly in Diagnostics?
■ Paper In Sensor, 005-103

■ Paper Out Sensor, 005-104

■ Paper Detect Sensor, 005-105

■ Jam Detect Sensor, 005-108

3 Are the connectors on the Document Go to step 4. Properly seat the

Feeder Control Board (ADCB) connectors.
properly connected?
4 Replace the DADF Top Cover Replace the Troubleshooting
Assembly (page 8-35). DADF Assembly complete.
Does the error still occur? (page 8-38).

3-40 WorkCentre 6400 Service Manual

Error Messages and Codes

Scanner Fault

The Scanner has reported a failure or is not performing as expected.

Applicable Chain-Link Codes

■ 305.165.00: Scanner DRAM Test Failure

■ 305.166.00: Home Position Test Failure

■ 305.168.00: Optical Test Failure

■ 314.001.00: IIT Home Position Error

■ 315.007.00: Internal Target Error

■ 315.008.00: IIT Optical Error

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the Image Processor Board with the 2 standoff screws.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Scanner, PL2.01
■ LVPS, PL10.07
■ Image Processor Board, PL20.07
■ MCU Board, PL20.09

Note
To access the CN_SCANNER connector, secure the DADF to the
Scanner Flat Bed, remove the two hinge plates from the Scanner Hinges,
and raise the Control Panel (Scanner Assembly) to 90°. The
CN_SCANNER connector is located on the bottom right corner of the
Scanner Flat Bed.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Perform the Scanner Test Function Go to step 2. Troubleshooting

checks (dc575) in Diagnostics complete.
(page 4-39).
Does the error still occur?
2 Does the CN_SCANNER connector Go to step 4. Go to step 3.
have all the appropriate voltages (see
the “Voltage Chart” on page 3-42)?

WorkCentre 6400 Service Manual 3-41

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Does PJ38MCU have 11v on pins 1 & Replace the Replace the MCU
3? LVPS Board
(page 8-82). (page 8-101).
4 Replace the Scanner (page 8-42). Replace the Troubleshooting
Does the error still occur? Image Processor complete.
Board
(page 8-98).

Voltage Chart

GND 3.3v GND 24.0v

(Green) (Yellow) (Green) (Red)

GND 11.0v GND 5.0v

(Green) (Pink) (Green) (Yellow)

3-42 WorkCentre 6400 Service Manual

Error Messages and Codes

Scanner Fault

The Scanner has reported the Scan Head is locked or the Lock Check
diagnostic test routine failed.

Applicable Chain-Link Codes

■ 305.167.00: Lock Check Failure

■ 314.003.00: Scan Head Locked

Initial Actions

■ Slide the Scanner Lock back and forth to confirm it moves freely.
■ Check the Scanner Lock is in the "Unlocked" position.

■ Inspect the Scanner for physical damage.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Scanner Assy, PL2.01

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Scanner interface cable Go to step 2. Remove and

connector correctly seated and reseat the cable.
secured to the Image Processor
Board with the 2 standoff screws?
2 Perform the Scan Head Lock test in Go to step 3. Go to step 4.
Diagnostics.
Does the test report the correct lock
position (locked or unlocked)?
3 Does the scanner now function Troubleshooting Go to step 4.
normally in Customer Mode? complete.
4 Perform “dc575 - Scanner Test” on Replace the Troubleshooting
page 4-39 for functions check in Scanner complete.
Diagnostics. Assembly
Does the error still occur? (page 8-42).

WorkCentre 6400 Service Manual 3-43

Error Messages and Codes

System Fault

The printer has reported that the Horizontal Transport Cooling Fan has failed.
This message is triggered when the feedback signal from the Cooling Fan
FM14 indicates a failure.

Applicable Chain-Link Code

■ 305.169.00: Scanner Cooling Fan is malfunctioning.

Initial Actions

■ Check the Horizontal Transport Cooling Fan for obstructions or physical

damage.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Horizontal Transport Cooling Fan, PL20.05 042-052, 042-053

■ MCU Board, PL20.09
■ Wire Harness, PL25.03

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Horizontal Transport Fan Exit Diagnostics Go to step 2.

FM14 in Diagnostics. and confirm the
Does the Fan rotate? error has
cleared.
2 Are connectors PJ37MCU and Go to step 3. Properly seat the
CN_FAN1 properly connected? connectors.
3 Replace the Horizontal Transport Fan Replace the MCU Troubleshooting
FM14. Board complete.
Does the error still occur? (page 8-101).

Engine Control
Board P/J37 CN_FAN1
(MCU) FM14_ON
1 1 FM14
GND
2 2 Cooling
LOCK
3 3 Fan Motor
s6400mfp-930

3-44 WorkCentre 6400 Service Manual

Error Messages and Codes

Document Feeder is not Available

Document Feeder error. One or more of the sensors within the DADF Paper
Tray indicates a sensor failure or unsupported Job Type was initiated.

Applicable Chain-Link Codes

■ 305.194.00: Size mismatch Jam using “slow scan mixed signals.”

■ 305.196.00: Size mismatch Jam using “no mixed sized signals.”

■ 305.197.00: Unsupported original size detected.

■ 305.274.00: ADF Original Size detection sensor failure.

Initial Actions

■ Verify the attempted copy/ scan job type is supported.

■ Verify whether any scraps of paper or debris are caught around the
Original Size Sensor.

■ Check the DADF Paper Tray width guides for correct operation.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ DADF Paper Tray, PL1.04

Includes:
Length Sensor (PS6) 005-229
Width Sensor 1 005-227
Width Sensor 2 005-228
■ DADF Assy, PL1.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the wire harness connector Go to step 2. Reseat

CN2 (located on the underside of the connector CN2.
DADF Paper Tray) that connects the
DFCB Board and Relay Board 2.
Is the connector seated correctly and
undamaged?
2 Replace the DADF Paper Tray Replace the Troubleshooting
(page 8-33). DADF Assembly complete.
Does the error still occur? (page 8-38).

WorkCentre 6400 Service Manual 3-45

Error Messages and Codes

System Fault

The printer has detected the Transfer Belt is not positioned correctly in respect
to the Imaging Units within an appropriate time frame. Therefore, the
Retraction Position Sensor 1 (PS12) is not activated (retract position) or
deactivated (press position) within a given period of time.

Applicable Chain-Link Code

■ 308.001.00: 1st Feeder Transfer Roller Contact Failure

Initial Actions

■ Check the couplings on the Transfer Belt, Main Drive Assembly, and
Intermediate Transport Motor for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Intermediate Transport Motor, PL12.02
■ Pressure Retraction Clutch, PL12.06 094-002
■ Retraction Position Sensor, PL14.20 094-200
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Retraction Position 1 Go to step 4. Go to step 2.

Sensor (PS12) function properly in
Diagnostics?
2 Is the MCU Board connector Go to step 3. Properly seat the
(PJ7MCU) properly connected? connector.
3 Are the Sensor connections (CN27 Replace the Properly seat the
and PJ13) properly connected? Retraction connector.
Position Sensor
1 (page 8-136).
4 Does the Pressure/ Retraction Clutch Go to step 7. Go to step 5.
1 function properly in Diagnostics?
5 Is the Clutch connector (CN26) Go to step 6. Properly seat the
properly connected? connector.

3-46 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Is the MCU Board connector Replace the Properly seat the
(PJ7MCU) properly connected? Pressure/ connector.
Retraction
Clutch 1
(page 8-59).
7 With nothing running in Diagnostics, Go to step 8. Go to step 10.
are the following voltages present?
■ PJ27MCU-1 = 24Vdc

■ PJ27MCU-3 = 5Vdc

8 Does wiring harness PJ27MCU to Go to step 9. Replace the

CN1M1 have continuity? wiring harness
9 Replace the Intermediate Transport Troubleshooting Go to step 10.
Motor (page 8-157). complete.
Does the printer function properly?

10 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

P/J2 CN_SIG
Engine HEATER1_REMA
1
5
HEATER2_REMA DC Power
Control 4 2
HEATER_PROTECT Supply
Board 3 4
POW_REM Board
(MCU) 2 5
24V2_REM (LVPS)
1 9
N.C. 3
N.C. 6
N.C. 7
N.C. 8
P/J1 CN_MBC
GND
10 1
GND
9 2
+24VDC
8 3
+24VDC
7 4
+24VDC
6 5
+24VDC
5 6
GND
4 7
GND
3 8
+5VDC
2 9
+3.3VDC
1
CN_OPN
N.C. 4
3
N.C. 2
1
s6400mfp-555

WorkCentre 6400 Service Manual 3-47

Error Messages and Codes

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

3-48 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The printer has detected the Transfer Belt is not positioned correctly in respect
to the Transfer Roller within an appropriate time frame. The Retraction
Position Sensor 2 (PS13) is not activated (retract position) or deactivated
(press position) within a given period of time.

Applicable Chain-Link Code

■ 308.002.00: 2nd Transfer Roller Contact Failure

Initial Actions

■ Check the couplings on the Transfer Belt, Main Drive Assembly, and
Intermediate Transport Motor for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Retraction Position Sensor 2, PL11.04 094-201
■ Pressure Retraction Clutch 2, PL11.10 094-005
■ Intermediate Transport Motor, PL12.02
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Retraction Position Sensor Go to step 4. Go to step 2.

2 function properly in Diagnostics?
2 Is the MCU Board connector Go to step 3. Properly seat the
(PJ10MCU) properly connected? connector.
3 Is the Sensor connection (PJ11) Replace the Properly seat the
properly connected? Retraction connector.
Position Sensor
2 (page 8-136)
4 Does the Pressure/ Retraction Clutch Go to step 7. Go to step 5.
2 function properly in Diagnostics?
5 Is the Clutch connector (CN17) Go to step 6. Properly seat the
properly connected? connector.
6 Is the MCU Board connector Replace the Properly seat the
(PJ10MCU) properly connected? Pressure/ connector.
Retraction
Clutch 2
(page 8-142).

WorkCentre 6400 Service Manual 3-49

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

7 With nothing running in Diagnostics, Go to step 8. Go to step 10.
are the following voltages present?
■ PJ27MCU-1 = 24Vdc

■ PJ27MCU-3 = 5Vdc

8 Does wiring harness PJ27MCU to Go to step 9. Replace the

CN1M1 have continuity? wiring harness.
9 Replace the Intermediate Transport Troubleshooting Go to step 10.
Motor (page 8-157). complete.
Does the printer function properly?
10 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

3-50 WorkCentre 6400 Service Manual

Error Messages and Codes

Misfeed in Tray 1

Paper fed from Tray 1 (MPT) did not unblock the Registration Sensor (PS9)
within a given period of time after the Tray 1 Paper Feed Clutch (CL1) is
turned On.

Applicable Chain-Link Code

■ 308.101.00: Jam at Tray 1 (MPT)

Initial Actions

■ Try picking paper from a different tray.

■ Ensure the paper is loaded correctly in the tray by removing any misfeed
sheets, pressing down the Lift Plate, Fan and reload the paper, and set
the width guides appropriately.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Feed Roller and surrounding area, as needed.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Separation Roller Assembly, PL5.25

■ Feed Roller, PL5.29
■ Registration Sensor, PL11.04 010-204
■ Intermediate Transport Motor, PL12.02
■ Tray 1 Paper Feed Clutch, PL12.15 072-003
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Separation Roller Assembly, excessively worn
PL5.25 parts.
■ Feed Roller, PL5.29

■ Registration Sensor, PL11.04

2 Does the Registration Sensor work Go to step 4. Go to step 3.

properly in Diagnostics?
3 Is the following voltage present? Replace the Replace the MCU
■ PJ15MCU-1 = 5Vdc Registration Board
Sensor (page 8-101).
(page 8-85).

WorkCentre 6400 Service Manual 3-51

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the Tray 1 Paper Feed Clutch Go to step 6. Go to step 5.
work properly in Diagnostics?
5 Is the following voltage present? Replace the Replace the MCU
■ PJ6MCU-4 = 24Vdc Paper Feed Board
Clutch (page 8-101).
(page 8-139).
6 Is the Motor connector (PJ15) Go to step 7. Properly seat the
properly connected? connector.
7 Is the MCU Board connector Go to step 8. Properly seat the
(PJ27MCU) properly connected? connector.
8 With the Motor not rotating, are the Replace the Replace the MCU
following voltages present? Intermediate Board
■ PJ27MCU-1 = 24Vdc Transport Motor (page 8-101).
■ PJ27MCU-3 = 5Vdc (page 8-157).

Engine Control
Board P/J15 P/J20
+5VDC OHP_REM
(MCU) 6 1 PS5
PS5_ON
5
+5VDC
2 OHP
4 3 Sensor
s6400mfp-540

Engine Control
Board
(MCU)
P/J15 P/J7
+5VDC PS9_ON
3 1 PS9
GND
2
+5VDC
2 Registration
1 3 Sensor
s6400mfp-541

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

3-52 WorkCentre 6400 Service Manual

Error Messages and Codes

Misfeed in Tray 2

Paper fed from Tray 2 did not unblock the Registration Sensor (PS9) within a
given period of time after the Tray 2 Paper Feed Clutch (CL3) is turned On.

Applicable Chain-Link Code

■ 308.102.00: Jam at Right Door/ Feed Cassette (Tray 2)

Initial Actions

■ Try picking paper from a different tray.

■ Ensure the paper is loaded correctly in the tray by removing any misfeed
sheets, pressing down the Lift Plate, Fan and reload the paper, and set
the width guides appropriately.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Feed Roller and surrounding area, as needed.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Registration Sensor, PL11.04 010-204

■ Intermediate Transport Motor, PL12.02
■ Tray 2 Paper Feed Clutch PL12.15 072-003
■ MCU Board, PL20.09
■ Separation Roller Assembly PL21.07
■ Feed Roller PL21.27

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Registration Sensor, PL11.04 excessively worn
■ Separation Roller Assembly, parts.
PL21.07
■ Feed Roller, PL21.27

■ Tray 2, PL21.28

2 Does the Registration Sensor work Go to step 5. Go to step 3.

properly in Diagnostics?
3 Are the Registration Sensor (PJ7) Go to step 4. Properly seat the
and MCU Board (PJ15MCU) connector.
connectors properly connected?

WorkCentre 6400 Service Manual 3-53

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the following voltage present? Replace the Replace the MCU
■ PJ15MCU-1 = 5Vdc Registration Board
Sensor (page 8-101).
(page 8-85).
5 Does the Tray 2 Paper Feed Clutch Go to step 8. Go to step 6.
work properly in Diagnostics?
6 Are the Tray 2 Paper Feed Clutch Go to step 7. Properly seat the
(CN11) and MCU Board (PJ6MCU) connector.
connectors properly connected?
7 Is the following voltage present? Replace the Replace the MCU
■ PJ6MCU-1 = 24Vdc Paper Feed Board
Clutch (page 8-101).
(page 8-139).
8 Is the Motor connector (PJ15) Go to step 9. Properly seat the
properly connected? connector.
9 Is the MCU Board connector Go to step 10. Properly seat the
(PJ27MCU) properly connected? connector.
10 With the Motor not rotating, are the Replace the Replace the MCU
following voltages present? Intermediate Board
■ PJ27MCU-1 = 24Vdc Transport Motor (page 8-101).
■ PJ27MCU-3 = 5Vdc (page 8-157).

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

Engine Control
Board P/J15 P/J20
+5VDC OHP_REM
(MCU) 6 1 PS5
PS5_ON
5
+5VDC
2 OHP
4 3 Sensor
s6400mfp-540

3-54 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board
(MCU)
P/J15 P/J7
+5VDC PS9_ON
3 1 PS9
GND
2
+5VDC
2 Registration
1 3 Sensor
s6400mfp-541

Engine Control
Board
(MCU)
Interlock
+24VDC

P/J6 CN11
+24VDC CL3
1 2
2 CL3_ON 1 Paper Feed Clutch 1
CN12
+24VDC
3 2 CL1
4 CL1_ON 1 Paper Feed Clutch 2
CN13
FM13_ON
5 3 FM13
GND
6 2 Exhaust Fan Motor
FM13_LOCK
7 1
s6400mfp-556

WorkCentre 6400 Service Manual 3-55

Error Messages and Codes

Misfeed in Tray 3/4

Paper fed from Tray 3/4 did not reach the Paper Feed Sensor (PS23) within a
given period of time after the Paper Feed Clutch 1 (CL6) is turned On. The
paper does not block the Registration Sensor (PS9) after a given period of
time after it has blocked the Paper Feed Sensor (PS23).The paper does not
unblock the Paper Feed Sensor (PS23) after a given period of after it has
blocked the Registration Sensor (PS9).

Applicable Chain-Link Codes

■ 308.103.00: Jam at Paper Transport/ Feed Cassette (Tray 3)

■ 308.104.00: Jam at Paper Transport/ Feed Cassette (Tray 4)

Initial Actions

■ Open the Tray 3/4 Vertical Transport Cover (PL28.03) and remove any
misfed or jammed paper.

■ Ensure the Tray 3/4 Vertical Transport Cover Extension (PL34.01) is

properly installed.

■ Try picking paper from a different tray.

■ Ensure the paper is loaded correctly in the tray by removing any misfeed
sheets, pressing down the Lift Plate, Fan and reload the paper, and set
the width guides appropriately.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Feed Roller and surrounding area, as needed.

■ If the problem persists, follow the procedure below.

Caution
Paper jammed in the vertical transport section (behind the Tray 3/4 Right
Door) must be removed before opening the tray or damage may occur.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Registration Sensor, PL11.04 010-204

■ MCU Board, PL20.09
■ LTA Circuit (PCCB) Board, PL28.11
■ Paper Feed Sensor, PL29.11 073-202
■ Paper Feed Clutch, PL30.03 073-004
■ Transport Motor, PL30.12
■ Feed Roller, PL32.05
■ Separation Roller Assembly, PL32.22

3-56 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Open the Vertical Transport Door of Replace any Go to step 2.

Tray 3/4 and remove any jammed damaged or
paper, then check the following for excessively worn
evidence of fault or damage: parts.
■ Registration Sensor, PL11.04

■ Paper Feed Sensor, PL29.11

■ Tray 3/4, PL31.24

■ Paper Take-Up Roller, PL32.05

■ Separation Roller Assembly,

PL32.22
2 Does the Paper Feed Sensor work Go to step 5. Go to step 3.
properly in Diagnostics?
3 Are the Paper Feed Sensor (PJ29) Go to step 4. Properly seat the
and PCC Board (PJ5PCCB) connector.
connectors properly connected?
4 Is the following voltage present? Replace the Replace the PCC
■ PJ5PCC-4 = 5Vdc Paper Feed Board
Sensor. (page 8-161).
5 Does the Registration Sensor work Go to step 8. Go to step 6.
properly in Diagnostics?
6 Are the Registration Sensor (PJ7) Go to step 7. Properly seat the
and MCU Board (PJ15MCU) connector.
connectors properly connected?
7 Is the following voltage present? Replace the Replace the MCU
■ PJ15MCU-1 = 5Vdc Registration Board
Sensor (page 8-101).
(page 8-85).
8 Does the Paper Feed Clutch work Go to step 11. Go to step 9.
properly in Diagnostics?
9 Are the Paper Feed Clutch (CN29) Go to step 10. Properly seat the
and PCC Board (PJ6PCCB) connector.
connectors properly connected?
10 Is the following voltage present? Replace the Replace the MCU
■ PJ6MCU-1 = 24Vdc Paper Feed Board
Clutch (page 8-101).
(page 8-169).
11 Is the PCC Board connector Go to step 12. Properly seat the
(PJ3PCCB) properly connected? connector.
12 Replace the Transport Motor Replace the PCC Troubleshooting
(page 8-171). Board complete.
Does the error still occur? (page 8-161).

WorkCentre 6400 Service Manual 3-57

Error Messages and Codes

Feeder Board
(PCCB)
P/J5 P/J30
+5VDC PS22_ON
9 1 PS22
GND
8
+5VDC
2 Paper Empty
7 3 Sensor
P/J29
PS23_ON
6 1 PS23
GND
5 +5VDC 2 Paper Feed
4 3 Sensor
P/J28
PS24_ON
3 1 PS24
GND
2 +5VDC 2 Right Door
1 3 Sensor
+24VDC PJ6 CN29 CL6
CL6_REM
2 1
+24VDC Paper Feed
1 2
Clutch
P/J3
B
4 A M16
3 B M Transport
2
1
A Motor
s6400mfp-931

3-58 WorkCentre 6400 Service Manual

Error Messages and Codes

Paper Jam Behind the Duplex Door/ Feed Area

The paper has jammed during the duplex process. The Duplex Jam Sensor
(part of the duplex control ADC Board) is not blocked, by the following paper,
after a given period of time after the Duplex Jam Sensor is unblocked, by the
previous paper. The paper does not unblock the Registration Sensor (PS9)
after a given period of time after the Duplex Jam Sensor has been unblocked.
The paper does not unblock the Registration Sensor (PS9) after a given
period of time after the paper feed sequence has started.

Applicable Chain-Link Codes

■ 308.105.00: Jam at Duplex

■ 310.104.00: Jam at Re-feeding Area

Initial Actions

■ Verify the type of media causing the jam is supported for duplex jobs.

■ Ensure the Duplex Unit and Right Side Cover are properly installed.

■ Inspect the Duplex Transport Rollers for dirt and clean with a soft cloth
dampened in warm water as necessary.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Component Control
Applicable Parts Code

■ Registration Sensor, PL11.04 010-204

■ MCU Board, PL20.09
■ Reverse Motor, PL22.13 077-020
■ Duplex Transport Rollers, PL23.01
■ Duplex Control (ADCB) Board (Duplex Sensor), PL23.12 077-109
■ Transport Motor, PL23.13 077-018

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following parts for Replace any Go to step 2.

evidence of obstructions or damage: damaged or
■ Registration Sensor, PL11.04 excessively worn
■ ADCB Actuator, PL22.09 parts.
■ Duplex Transport Rollers, PL23.01

2 Does the Registration Sensor work Go to step 4. Go to step 3.

properly in Diagnostics?

WorkCentre 6400 Service Manual 3-59

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Is the following voltage present? Replace the Replace the MCU
■ PJ15MCU-1 = 5Vdc Registration Board
Sensor (page 8-101).
(page 8-85).
4 Does the Duplex Transport Sensor Go to step 5. Replace the ADC
work properly in Diagnostics? Board
(page 8-177).
5 Does the Transport Motor work Go to step 7. Go to step 6.
properly in Diagnostics?
6 Replace the ADC Board (page 8-177). Replace the Troubleshooting
Does the error still occur? Transport Motor complete.
(page 8-178).
7 Does the Reverse Motor work Go to step 9. Go to step 8.
properly in Diagnostics?
8 Replace the ADC Board (page 8-177). Replace the Troubleshooting
Does the error still occur? Reverse Motor complete.
(page 8-174).
9 Replace the ADC Board (page 8-177). Replace the MCU Troubleshooting
Does the error still occur? Board complete.
(page 8-101).

3-60 WorkCentre 6400 Service Manual

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic system. The start of scan signal is
not detected within a given period of time after the output of the laser has
been started.
The Polygon Motor does not rotate consistently after a given period of time
while it is being started or the motor lock signal remains high for a given
period of time while the Polygon Motor is being rotated.

Applicable Chain-Link Codes

■ 309.001.00: Laser Unit Failure

■ 309.002.00: Laser Unit Polygon Motor Failure

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Laser Assembly, PL10.11 061-001

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Laser Unit Motor function in Go to step 5. Go to step 2.

Diagnostics?
2 Is the MCU Board connector Go to step 3. Properly seat the
(PJ23MCU) properly connected? connector.
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ22MCU) properly connected? connector.
4 Is the Image Processor Board Go to step 5. Properly seat the
connector (PJ901IP) properly connector.
connected?
5 Replace the MCU Board Replace the Troubleshooting
(page 8-101). Laser Unit complete.
Does the error still occur? (page 8-126).

WorkCentre 6400 Service Manual 3-61

Error Messages and Codes

Engine Control
Board (MCU) P/J22 P/J16
GND
11 3 TH3
TH3_ON
10 2 Thermistor 3
P/J12
CLK
9 5
LOCK
8 4 M8
+24VDC REM M
7 3
GND Polygon
6 2
+24VDC
1
Motor
5
+5VDC

P/J1
+5VDC
4 1 Index Board
SOS
3 2 (INDEXB)
GND
2 3
CHANGE
1 4
s6400mfp-550

Engine
Control Image
Board Processor
(MCU) Laser Drive Board
+5VDC
P/J23 P/J1 Board (Y) (IP)
1
+5VDC
5
P/J2 P/J901
S/H_Y GND
2 4 4 1
LD_EN_Y DATA*
3 3 3 2
LDPC_Y DATA
4 2 2 3
GND GND
5 1 1 4
6 NC
Laser Drive
P/J1 Board (M)
+5VDC P/J2
7 5
S/H_M GND
8 4 4 5
LD_EN_M DATA*
9 3 3 6
LDPC_M DATA
10 2 2 7
GND GND
11 1 1 8
12 NC
Laser Drive
P/J1 Board (C)
+5VDC P/J2
13 5
S/H_C GND
14 4 4 9
LD_EN_C DATA*
15 3 3 10
LDPC_C DATA
16 2 2 11
GND GND
17 1 1 12
18 NC
Laser Drive
P/J1 Board (K)
+5VDC P/J2
19 5
S/H_K GND
20 4 4 13
LD_EN_K DATA*
21 3 3 14
LDPC_K DATA
22 2 2 15
GND GND
23 1 1 16

s6400mfp-013

3-62 WorkCentre 6400 Service Manual

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic system. The Developer Motor K (M5)
does not rotate evenly after a given period of time while it is being started or
the motor lock signal remains high for a given period of time while the
Developer Motor K is being rotated.

Applicable Chain-Link Code

■ 309.003.00: Black Developer Motor Failure

Initial Actions

■ Remove the K Imaging Unit and inspect the coupling for any obstructions
or damage. Be sure to check the coupling on the Imaging Unit and the
Main Drive Assembly.

■ Check the alignment rail and make sure it is properly mounted to the
frame so the couplings seat correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS, PL10.17
■ Developer Motor K, PL12.02 093-023
■ MCU Board, PL20.09

Caution
The Waste Cartridge must be installed when performing the Developer
Motor K in Diagnostics to prevent toner leakage.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 With the K Imaging Unit removed, Replace the Go to step 2.

does the motor function properly in Developer Motor
Diagnostics? K (page 8-156).
2 Is the Motor connector (PJ21) Go to step 3. Properly seat the
properly connected? connector.
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ33MCU) properly connected? connector.
4 With the Motor turned On in Go to step 5. Go to step 7.
Diagnostics, are the following
voltages present?
■ PJ33MCU-1 = 24Vdc

■ PJ33MCU-3 = 5Vdc

WorkCentre 6400 Service Manual 3-63

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Does the wiring harness (PJ33MCU Go to step 6. Replace the
to P/J21) have continuity for all wiring harness.
wires?
6 Replace the Developer Motor K (M5) Troubleshooting Go to step 7.
(page 8-156)? complete.
Does it function in Diagnostics, with
all the Imaging Units removed?
7 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

Engine P/J33
8 NC P/J21
Control CHANGE
7 1
Board LOCK
6 2
(MCU) CLK
5 3
GND M5
4 4 M
+24VDC REM
3 5 Developing
GND
2 6 Motor K
+24VDC
1 7
s6400mfp-558

3-64 WorkCentre 6400 Service Manual

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic system. The Developer YMC Motor
(M4) does not rotate consistently after a given period of time while it is being
started or the motor lock signal remains high for a given period of time while
the color PC Drum Motor is being rotated.

Applicable Chain-Link Code

■ 309.004.00: Color Developer Motor Failure

Initial Actions

■ Remove the Y, M, and C Imaging Units and inspect the couplings for any
obstructions or damage. Be sure to check the coupling on the Imaging
Units and the Main Drive Assembly.

■ Check the alignment rails, for each Imaging Unit, and make sure they are
properly mounted to the frame so the couplings seat correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Main Drive Assembly, PL12.22 093-024
■ MCU Board, PL20.09
■ Wiring Harness, PL24.06

Caution
The Waste Cartridge must be installed during manual operation to
prevent toner leakage.

Caution
The Developer YMC Motor is part of the Main Drive Assembly and is
aligned at the factory. Do not remove it from the assembly.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 With the Imaging Units removed, Replace the Main Go to step 2.
does the Motor function properly in Drive Assembly
Diagnostics? (page 8-142).
2 Is the Motor connector (P/J16) Go to step 3. Properly seat the
properly connected? connector.
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ8MCU) properly connected? connector.

WorkCentre 6400 Service Manual 3-65

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 With nothing running in Diagnostics, Go to step 5. Go to step 7.
are the following voltages present?
■ PJ8MCU-1 = 24Vdc

■ PJ8MCU-3 = 5Vdc

5 Does the wiring harness PJ8MCU to Go to step 6. Replace the

P/J16 have continuity? wiring harness.
6 Replace the Main Drive Assembly Troubleshooting Go to step 7.
(page 8-142). complete.
Does the Motor function in
Diagnostics, with the Imaging Units
removed?
7 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

3-66 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board P/J8
8 NC P/J16
(MCU) CHANGE
7 1
LOCK
6 2
CLK
5 3
GND M4
4 4 M
+24VDC REM
3 5 Developing
GND
2 6 Motor Y, M, C
+24VDC
1 7

s6400mfp-549

WorkCentre 6400 Service Manual 3-67

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic system. The Color PC Drum Motor
(M3) does not rotate consistently after a given period of time while it is being
started or the motor lock signal remains high for a given period of time while
the color PC Drum Motor is being rotated.

Applicable Chain-Link Code

■ 309.005.00: Color Print Cartridge (IU) Motor Failure

Initial Actions

■ Remove the Y, M, and C Imaging Units and inspect the couplings for any
obstructions or damage. Be sure to check the coupling on the Imaging
Units and the Main Drive Assembly.

■ Check the alignment rails, for each Imaging Unit, and make sure it is they
are properly mounted to the frame so the couplings seat correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Color PC Drum Motor (M3), PL12.01 093-082
■ MCU Board, PL20.09
■ Wiring Harness, PL24.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 With the Imaging Units removed, Replace the Go to step 2.

does the Motor function properly in Color PC Drum
Diagnostics? Motor (M3)
(page 8-155).
2 Is the Motor connector (P/J14) Go to step 3. Properly seat the
properly connected? connector.
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ14MCU) properly connected? connector.
4 With the Motor turned On in Go to step 5. Go to step 7.
Diagnostics, are the following
voltages present?
■ PJ14MCU-1 = 24Vdc

■ PJ14MCU-3 = 5Vdc

5 Does the wiring harness PJ14MCU to Go to step 6. Replace the

P/J14 have continuity? wiring harness.

3-68 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Replace the Color PC Drum Motor Troubleshooting Go to step 7.
(M3) (page 8-155). complete.
Does the Motor function in
Diagnostics with the Imaging Unit
installed?
7 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

WorkCentre 6400 Service Manual 3-69

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic system. The Intermediate Transport

Motor (M1) does not rotate evenly after it has been started or the motor lock
signal remains high for a period of time while it is being used.

Applicable Chain-Link Code

■ 309.006.00: Black Print Cartridge (IU) Motor Failure

Initial Actions

■ Remove any paper from Tray 1 and clear any obstructions from the Feed
Roller.

■ Remove the K Imaging Unit and Transfer Belt; inspect the couplings for
any obstructions or damage. Be sure to check the couplings on the
Imaging Unit, Transfer Belt, and Main Drive Assembly.

■ Check the alignment rails, for the K Imaging Unit, and make sure they are
properly mounted to the frame so the couplings seat correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Intermediate Transport Motor, PL12.02 093-023
■ Transfer Belt, PL14.16
■ MCU Board, PL20.09

Caution
The K Imaging Unit, Toner Cartridges, and Transfer Belt must be removed
but the Waste Cartridge must be installed when running the Motor in
Diagnostics.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 With the K Imaging Unit, Toner Replace the Go to step 2.
Cartridges, and Transfer Belt Intermediate
removed, does the Motor function Transport Motor
properly in Diagnostics? (page 8-157).
2 Is the Motor connector (PJ15) Go to step 3. Properly seat the
properly connected? connector.
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ27MCU) properly connected? connector.

3-70 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 With the Motor not rotating, are the Go to step 5. Go to step 7.
following voltages present?
■ PJ27MCU-1 = 24Vdc

■ PJ27MCU-3 = 5Vdc

5 Does the wiring harness (PJ27MCU Go to step 6. Replace the

to PJ15) have continuity? wiring harness.
6 Replace the Intermediate Transport Go to step 7. Troubleshooting
Motor (page 8-157). complete.
Does the error still occur?
7 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

Engine P/J27 P/J15

CHANGE
7 1
Control LOCK
6 2
Board CLK
5 3
(MCU) FR
4 M M1
+24VDC
4 REM
3 5 Intermediate
GND
2 6 Transport Motor
+24VDC
1 7
s6400mfp-547

WorkCentre 6400 Service Manual 3-71

Error Messages and Codes

Xerographic System Error

Communications between the Toner Low Sensor Board (TLSB) and the
corresponding Imaging Unit has been interrupted.

Applicable Chain-Link Codes

■ 309.007.00: Cyan Imaging Unit Failure

■ 309.008.00: Magenta Imaging Unit Failure

■ 309.009.00: Yellow Imaging Unit Failure

■ 309.010.00: Black Imaging Unit Failure

Initial Actions

■ Check the corresponding Imaging Unit for proper installation.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Codes

■ Toner Low Sensor Board, PL6.18

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board connector Go to step 2. Properly seat the

(PJ13MCU) properly connected? connector.
2 With nothing running in Diagnostics, Replace the Replace the MCU
are the following voltages present? Toner Low Board
■ PJ13MCU-1 = 5Vdc Sensor Board (page 8-101).
■ PJ13MCU-4 = 5Vdc (page 8-79).

Engine P/J13 P/J2

CSIC_RXD *2
Control 11 1 Toner Low
CSIC_TXD *1
Board 10 2 Sensor Board
GND
9 3
(MCU) (TLSB)
K
P/J1
8 1
C
7 2
M
6 3
Y
5 4
LED
4 5
+5VDC NC
3 6
NC
2 7
+5VDC
1 8
s6400mfp-553

3-72 WorkCentre 6400 Service Manual

Error Messages and Codes

Auto Calibration Failed

The printer detected an Automatic Image Quality calibration error. The

Automatic Image Quality (Image stabilization) routine, initiated periodically by
the IOT, failed after 3 attempts.

Applicable Chain-Link Codes

■ 309.011.00: IDC Sensor Board Error (Front)

■ 309.012.00: IDC Sensor Board Error (Rear)

■ 309.013.00: Color Registration Error Correction - Internal Test Pattern

■ 309.014.00: Color Registration Error Correction - Correction Amount

Initial Actions

■ Power cycle the printer.

■ Perform the manual Image Quality Calibration (Machine Status -> Tools
-> Calibration menu).

■ Print the System Status embedded page to check for image quality
defects.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ IDCSB Cover (Shutter), PL14.11

■ Image Density Control Sensor Board (IDCSB F/R),
PL14.13
■ Transfer Belt Unit, PL14.16
■ MCU Board, PL20.09
■ Wire Harness, PL24.05

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Clean the Front and Rear Image Go to step 2. Troubleshooting

Density Control Boards. complete.
Does the error still occur?
2 Check the IDCSB Cover (shutter) for Replace the Go to step 3.
correct operation or damage. IDCSB Cover.
Is there damage noted?
3 Replace the appropriate Sensor Go to step 4. Troubleshooting
(IDCSB F/R) (page 8-87). complete.
Does the error still occur?

WorkCentre 6400 Service Manual 3-73

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Replace the MCU Board Replace the Troubleshooting
(page 8-101). Transfer Belt complete.
Does the error still occur? (page 8-20).

Engine Control
Board
(MCU) P/J12 P/J8
IDCSB/R_V01 (REG)
1 5
+5VDC IDCSB/R_V02 (L)
2 4 IDC Sensor
GND
3 3 Board Rear
+5VDC
4 2
IDCSB/R_VREF (IDCB/R)
5 1
s6400mfp-545

Engine Control
Board
(MCU) P/J9
IDCSB/F_V01 (REG)
6 5
+5VDC IDCSB/F_V02 (L)
7
GND
4 IDC Sensor
8 3 Board Front
+5VDC
9 2
IDCSB/F_VREF (IDCB/F)
10 1
s6400mfp-546

3-74 WorkCentre 6400 Service Manual

Error Messages and Codes

Paper Jam Under the Control Panel

The printer has detected a paper jam while transporting the paper from the
Fuser to the exit area. If a Finisher is not installed, the Exit Sensor (PS15) is
not blocked after a given period of time after the Fuser Exit Sensor was
unblocked. If a Finisher is installed, the Finisher Entrance Sensor (PS1) is not
blocked after a given period of time after the Fuser Exit Sensor was
unblocked.

Applicable Chain-Link Code

■ 310.102.00: Jam at Horizontal Transfer Door

Initial Actions

■ Open the Front Door and lift the Control Panel to check the Horizontal
Transport area for any obstructions, paper, damage, or debris.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Upper and Lower Horizontal Transport Rollers, as needed.

■ Check the Sensor Actuators for proper function and obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Horizontal Transport - Upper, PL17.37

■ Horizontal Transport - Lower, PL17.48
■ Fuser (Exit Sensor), PL18.01 010-208
■ Exit Sensor 2, PL19.13 010-205
■ MCU Board, PL20.09
■ Duplex Reverse Motor, PL22.13 077-020
■ Entrance Sensor, PL38.10
■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Horizontal Transport - Upper, excessively worn
PL17.37 parts.
■ Horizontal Transport - Lower,
PL17.48
■ Actuator, PL19.09

WorkCentre 6400 Service Manual 3-75

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 If Finisher is not installed, does the Go to step 10. Go to step 3.
Exit Sensor 2 work properly in
Diagnostics?
If a Finisher is installed, go to step 6.
3 Are the Exit Sensor 2 connectors Go to step 4. Properly seat the
(CN_Exit & CN_Exit1) properly connectors.
connected?
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ36MCU) properly connected? connectors.
5 Is the following voltage present? Replace the Exit Replace the MCU
■ PJ36MCU-1 = 5Vdc Sensor 2. Board
(page 8-101).
6 If a Finisher is installed, does the Go to step 9. Go to step 7.
Entrance Sensor work properly in
Diagnostics?
7 Is the Entrance Sensor connector Go to step 8. Properly seat the
(PJ2) and the MCU Board connector connectors.
(CN10MCU) properly connected?
8 Is the following voltage present? Replace the Replace the FSC
■ PJ10MCU-1 = 5Vdc Entrance Sensor Board
(page 8-189). (page 8-205).
9 Does the Duplex Reverse Motor work Go to step 10. Replace the
properly in Diagnostics? Duplex Reverse
Motor
(page 8-174).
10 Does the Fuser Exit Sensor work Replace the MCU Go to step 11.
properly in Diagnostics? Board
(page 8-101).
11 Is the following voltage present? Replace the Replace the MCU
■ PJ4MCU-4 = 5Vdc Fuser Board
(page 8-24). (page 8-101).

Engine Control
Board (MCU)
+5VDC
P/J36 CN_EXIT CN_EXIT1
+5VDC
1 6 3 PS15
GND
2 5 2 Exit
PS15_ON
3 4 1 Sensor 2
CN_EXIT2
+5VDC
4 3 3 PS14
GND
5 2 2 Paper Full
PS14_ON
6 1 1 Sensor
s6400mfp-929

3-76 WorkCentre 6400 Service Manual

Error Messages and Codes

Finisher
Control Board
(FSCB)
CN10 P/J2
+5VDC PS1_ON
3 1 PS1
GND
2
+5VDC
2 Entrance
1 3 Sensor
s6400mfp-932

Engine Control
+5VDCBoard
(MCU) P/J36 CN_EXIT CN_EXIT1
+5VDC
1 6 3 PS15
GND
2 5 2 Exit
PS15_ON
3 4 1 Sensor 2
CN_EXIT2
+5VDC
4 3 3 PS14
GND
5 2 2 Paper Full
PS14_ON
+5VDC
6 1 1 Sensor
P/J4 CN_FSR1A
+5VDC Fusing Unit
1 1
GND
2 2
PAPER_SIZE_SEN_ON
3 3
+5VDC
4 4
GND
5 5
EXIT_SEN_ON
6 6
7
8
9
10
CN_FSR1B
THERMISTOR/2_ON
7 1
GND
8 2
FU_UNIT_DET
9 3
THERMISTOR/1_ON
10 GND 4
11 5
GND
12 6
7
8
9
10
s6400mfp-554

WorkCentre 6400 Service Manual 3-77

Error Messages and Codes

Paper Jam Behind the Right Side Door

The Registration Sensor (PS9) was not blocked after a given amount of time
after the previous paper unblocked the Sensor during a multiple page job. The
Fuser Exit Sensor was not blocked after a given amount of time after the
Registration Sensor (PS9) was unblocked. The pressure sequence of the 2nd
Transfer Section has not started while the paper is blocking the Registration
Sensor (PS9) during transport.

Applicable Chain-Link Codes

■ 310.103.00: Jam at 2nd Image Transfer Roller

■ 310.105.00: Jam at Vertical Transport Area

Initial Actions

■ Remove the Fuser and check for any obstructions, paper, damage, or
debris.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Check the Registration Sensor for obstructions or damage.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Registration Sensor, PL11.04 010-204

■ Pressure Retraction Clutch 2, PL11.10 094-005
■ Drive Assembly, PL12.22
■ Fuser (Exit Sensor), PL18.01 010-208
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Registration Sensor work Go to step 3. Go to step 2.

properly in Diagnostics?
2 Is the following voltage present? Replace the Replace the MCU
■ PJ15MCU-1 = 5Vdc Registration Board
Sensor (page 8-101).
(page 8-85).
3 Does the Fuser Exit Sensor work Go to step 5. Go to step 4.
properly in Diagnostics?

3-78 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the following voltage present? Replace the Replace the MCU
■ PJ4MCU-4 = 5Vdc Fuser Unit Board
(page 8-24). (page 8-101).
5 Does the Pressure Retraction Clutch Replace the MCU Go to step 6.
2 work properly in Diagnostics? Board
(page 8-101).
6 Is the MCU Board connector Go to step 7. Properly seat the
(PJ10MCU) properly connected? connector.
7 Is the Pressure Retraction Clutch 2 Go to step 8. Properly seat the
connector (CN17) properly connector.
connected?
8 Is the following voltage present? Replace the Replace the MCU
■ PJ10MCU-7 = 24Vdc Drive Assembly Board
(page 8-142). (page 8-101).

Engine Control
Board P/J15 P/J20
+5VDC OHP_REM
(MCU) 6 1 PS5
PS5_ON
5
+5VDC
2 OHP
4 3 Sensor
s6400mfp-540

WorkCentre 6400 Service Manual 3-79

Error Messages and Codes

Engine Control
Board
(MCU)
P/J15 P/J7
+5VDC PS9_ON
3 1 PS9
GND
2
+5VDC
2 Registration
1 3 Sensor
s6400mfp-541

3-80 WorkCentre 6400 Service Manual

Error Messages and Codes

Paper Jam Behind the Right Side Door

The Fuser Exit Sensor was blocked for too long a period of time during paper
feeding.
The paper does not unblock the ADC Board Sensor after a given period of
time once the Fuser Exit Sensor is blocked during duplex operation.

Applicable Chain-Link Code

■ 310.106.00: Jam at Fuser

Initial Actions

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Remove the Fuser and check for any obstructions, paper, damage, or
debris.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Fusing Motor, PL12.04 010-005

■ Fuser (Exit Sensor), PL18.01 010-208
■ MCU Board, PL20.09
■ Duplex Reverse Motor, PL22.13 077-020
■ ADC Board (Duplex Sensor), PL23.12 077-109

Note
The Fuser Unit must be removed prior to testing the Fuser Motor (M2).

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Horizontal Transport Upper, excessively worn
PL17.37 parts.
■ Horizontal Transport Lower,
PL17.48
■ Fuser Unit, PL18.01

■ ADCB Actuator, PL22.09

2 Does the Fuser Exit Sensor work Go to step 4. Go to step 3.

properly in Diagnostics?
3 Is the following voltage present? Replace the Replace the MCU
■ PJ4MCU-4 = 5Vdc Fuser Board
(page 8-24). (page 8-101).

WorkCentre 6400 Service Manual 3-81

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the Fuser Motor work properly Go to step 6. Replace the
in Diagnostics? Fuser Motor
(page 8-158).
5 Is the following voltage present? Replace the Replace the MCU
■ PJ19MCU-1 = 24Vdc Fuser Motor Board
(page 8-158). (page 8-101).
6 Does the Duplex Reverse Motor work Go to step 7. Replace the
properly in Diagnostics? Duplex Reverse
Motor
(page 8-174).
7 Does the Duplex Sensor work Replace the MCU Replace the ADC
properly in Diagnostics? Board Board
(page 8-101). (page 8-177).

3-82 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board (MCU) P/J19 P/J17
CHANGE
7 1
LOCK
6 2
CLK
5 3 M2
NC
4 4 M Fusing Motor
+24VDC REM
3 5
GND
2 6
+24VDC
1 7

s6400mfp-551

WorkCentre 6400 Service Manual 3-83

Error Messages and Codes

Fuser System Error

The printer detected the Fuser temperature is not within the specified range
for the selected media type or is taking too long to warm up. The Fuser
Thermistor 1 or Fuser Thermistor 2 does not detect the specified temperature
and the warm-up cycle is not completed even after the lapse of a given period
of time. The temperature detected by the Fuser Thermistor 1 or Fuser
Thermistor 2 remains lower or higher than the specified value for a given
period of time.

Applicable Chain-Link Codes

■ 310.301.00: Fuser Warm-Up Time Failure (Thermal Heater)

■ 310.302.00: Fuser Warm-Up Time Failure (Pressure Roller)

■ 310.303.00: Fuser Temperature Too Low (Thermal Heater)

■ 310.304.00: Fuser Temperature Too Low (Pressure Roller)

■ 310.305.00: Fuser Temperature Too High (Thermal Heater)

■ 310.306.00: Fuser Temperature Too High (Pressure Roller)

Initial Actions

■ Check the Fuser for proper installation.

■ Check the Fuser electrical connector for damage.

■ Replace the Fuser (page 8-24).

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LVPS Board, PL10.17

■ Fuser, PL18.01
■ MCU Board, PL20.09

Warning
The Fuser may be hot. Turn the printer power Off and allow at least 5
minutes for the Fuser to cool before removing the Fuser.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board connector Go to step 2. Properly seat the

(PJ4MCU) properly connected? connector.
2 Is the LVPS Board connector Go to step 3. Properly seat the
(CN_FSRDCPU) properly connected? connector.

3-84 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Are the connections to the Fuser Go to step 4. Properly seat the
bulkhead properly connected connector.
(CN_FSR1, CN_FSR1A, &
CN_FSR1B)?
4 Replace the LVPS Board (page 8-82). Replace the MCU Troubleshooting
Does the error still occur? Board complete.
(page 8-101).

CN_FSR CN_FSR1
DC Power NUT2
6 1
Supply 5 NC 2 Fusing
NUT1
Board 4 3
Unit
(LVPS) 3 NC 4
2 HOT 5
1 HOT 6
s6400mfp-933

WorkCentre 6400 Service Manual 3-85

Error Messages and Codes

Fuser System Error

The Fuser Cooling Fan (FM12) does not rotate consistently after a given
period of time while it is being started or the motor lock signal remains high for
a given period of time while the Fuser Cooling Fan is being rotated.

Applicable Chain-Link Code

■ 310.307.00: Fuser Fan Failure

Initial Actions

■ Check the Fusing Fan Motor for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Fuser Cooling Fan, PL13.02 042-019/ 042-020

■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the MCU Board connector Go to step 2. Properly seat the

(PJ21MCU) properly connected? connector.
2 Does the Fan work in Diagnostics? Replace the Replace the MCU
Fuser Cooling Board
Fan (page 8-101).
(page 8-150).

Engine Control
Board (MCU)
P/J21
FM12_LOCK FM12
3
GND Fusing
2 FM12_ON
1 Fan Motor
s6400mfp-552

3-86 WorkCentre 6400 Service Manual

Error Messages and Codes

Fuser System Error

The Fuser Motor (M2) does not rotate consistently after a given period of time
while it is being started or the motor lock signal remains high for a given
period of time while the Fuser Motor is being rotated.

Applicable Chain-Link Code

■ 310.308.00: Fuser Motor Failure

Initial Actions

■ Check the Fuser Motor and drive mechanism for damage or obstructions.

■ Check to make sure the Fuser is properly seated and locked in place.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Micro Switch, PL11.13

■ Fuser Motor, PL12.04 010-005
■ Fuser Unit, PL18.01
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Remove the Fuser and manually Go to step 2. Replace the

rotate the large white gear on the Fuser
bottom. (page 8-24).
Does the gear turn?
2 With the Fuser installed and the Right Go to step 5. Go to step 3.
and Front Doors closed, do pins
PJ3MCU-1 and PJ3MCU-3 have
continuity?
3 Does MS3 have continuity when it is Go to step 4. Replace the
closed? Micro Switch
MS3.
4 Does MS4 have continuity when it is Replace the Replace the
closed? MicroSwitch Micro Switch
MS2. MS4.
5 With the Fuser removed, does the Replace the Go to step 6.
Motor function properly in Fuser Motor
Diagnostics? (page 8-158).
6 Is the Motor connector (PJ17) Go to step 7. Properly seat the
properly connected? connector.

WorkCentre 6400 Service Manual 3-87

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

7 Is the MCU Board connector Go to step 8. Properly seat the
(PJ19MCU) properly connected? connector.
8 With the Motor turned On in Go to step 10. Go to step 9.
Diagnostics, are the following
voltages present?
■ PJ19MCU-1 = 24Vdc

■ PJ19MCU-3 = 5Vdc

9 Does the wiring harness PJ19MCU to Go to step 10. Replace the

PJ17 have continuity? wiring harness.
10 Replace the Fuser Motor Troubleshooting Go to step 11.
(page 8-158). complete.
Does the Motor function in
Diagnostics?
11 Are the following voltages present? Replace the MCU Replace the
■ PJ1MCU-2 = 5Vdc Board LVPS Board
■ PJ1MCU-5 to 8 = 24Vdc (page 8-101). (page 8-82).

3-88 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board (MCU) P/J19 P/J17
CHANGE
7 1
LOCK
6 2
CLK
5 3 M2
NC
4 4 M Fusing Motor
+24VDC REM
3 5
GND
2 6
+24VDC
1 7

s6400mfp-551

WorkCentre 6400 Service Manual 3-89

Error Messages and Codes

Finisher Error

An error occurred during writing or erasing of the Finisher flash ROM.

Applicable Chain-Link Code

■ 312.098.00: Finisher Flash ROM Failure

Initial Actions

■ Power cycle the printer.

■ Check the Finisher connector for proper connection.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are the MCU Board connectors Go to step 2. Properly seat the

(PJ34MCU & PJ35MCU) properly connector.
connected?
2 Are the Finisher Control Board Go to step 3. Properly seat the
connectors (CN1FSCB & CN4FSCB) connector.
properly connected?
3 Reload firmware. Replace the Troubleshooting
Does the error still occur? Finisher Control complete.
Board
(page 8-205).

3-90 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control Optional

Board P/J35 CN29A CN1 Finisher
CTS
(MCU) 6 1 1 (FSCB)
RTS
5 2 2
GND
4 3 3
RXD *2
3 4 4
GND
2 5 5
TXD *1
1 6 6
+24VDC
P/J34 CN29L CN4
GND
2 4 4
+24VDC
1 3 3
NC 2 2
1 1

s6400mfp-934

Finisher
Control Board
(FSCB) CN4 CN3
RTS Printer
6 1
CTS
5 2
GND
4 3
TXD*2
3 4
GND
2 5
RXD*1
1 6

CN1 CN2
+24VDC GND
3 4
GND
2 2
+24VDC
1 1
GND
3
s6400mfp-935

WorkCentre 6400 Service Manual 3-91

Error Messages and Codes

Finisher Error

A communication error occurred between the Finisher and engine main body.

Applicable Chain-Link Code

■ 312.099.00: Finisher Communication Failure

Initial Actions

■ Power cycle the printer.

■ Check the Finisher to main body connector for proper connection.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ MCU Board, PL20.09

■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are the MCU Board connectors Go to step 2. Properly seat the

(PJ34MCU & PJ35MCU) properly connector.
connected?
2 Are the Finisher Control Board Go to step 3. Properly seat the
connectors (CN1FSCB & CN4FSCB) connector.
properly connected?
3 Replace the Finisher Control Board Replace the MCU Troubleshooting
(page 8-205). Board complete.
Does the error still occur? (page 8-101).

3-92 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control Optional

Board P/J35 CN29A CN1 Finisher
CTS
(MCU) 6 1 1 (FSCB)
RTS
5 2 2
GND
4 3 3
RXD *2
3 4 4
GND
2 5 5
TXD *1
1 6 6
+24VDC
P/J34 CN29L CN4
GND
2 4 4
+24VDC
1 3 3
NC 2 2
1 1

s6400mfp-934

Finisher
Control Board
(FSCB) CN4 CN3
RTS Printer
6 1
CTS
5 2
GND
4 3
TXD*2
3 4
GND
2 5
RXD*1
1 6

CN1 CN2
+24VDC GND
3 4
GND
2 2
+24VDC
1 1
GND
3
s6400mfp-935

WorkCentre 6400 Service Manual 3-93

Error Messages and Codes

Finisher Error

The Finisher was adjusting the Main Tray position and detected a problem
with the movement or location of the Main Tray. The Paper Level Sensor 1
(PS9) is not activated and the Paper Level Sensor 2 (PS10) is not deactivated
within a given period of time after the Tray Up/ Down Motor (M6) is energized.
The Tray Upper Sensor (PS12) is not activated and the Tray Lower Sensor
(PS13) is not deactivated within a given period of time after the Tray Up/ Down
Motor (M6) is turned On.

Applicable Chain-Link Code

■ 312.480.00: Finisher Elevation Drive Failure

Initial Actions

■ Check the Tray Up/ Down Motor and drive coupling for damage or
obstructions.

■ Check the Paper Level Sensor 1, Paper Level Sensor 2, Tray Upper
Sensor, and Tray Lower Sensor Actuators for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Paper Level Sensor 1, PL36.14 012-309

■ Paper Level Sensor 2, PL36.14 012-310
■ Finisher Control Board, PL46.16
■ Tray Up/Down Motor, PL48.02 012-057
■ Tray Upper Sensor, PL48.03 012-312
■ Tray Lower Sensor, PL48.03 012-313
■ Main Tray Assembly, PL48.18

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Paper Level Sensor connector Go to step 2. Reseat the

(CN1) and CN8FSCB properly connectors.
connected?
2 Does the Paper Level Sensor 1 Go to step 3. Replace the
function properly in Diagnostics? Paper Level
Sensor 1
(page 8-185).
3 Does the Paper Level Sensor 2 Go to step 4. Replace the
function properly in Diagnostics? Paper Level
Sensor 2
(page 8-185).

3-94 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the Tray Upper Sensor function Go to step 5. Go to step 7.
properly in Diagnostics?
5 Does the Tray Lower Sensor function Go to step 6. Go to step 7.
properly in Diagnostics?
6 Does the Tray Up/ Down Motor Replace the Go to step 7.
function properly in Diagnostics? Finisher Control
Board
(page 8-205).
7 Replace the Finisher Main Tray Replace the Troubleshooting
Assembly (page 8-216). Finisher Control complete.
Does the error still occur? Board
(page 8-205).

Finisher Control
Board (FSCB) CN22 CN8 P/J18 M6
+ Tray
1 1 1
- M
2 2 2 Up/Down
3 NC Motor
CN5 P/J17
+5VDC PS13_ON
1 3 1 PS13
GND 4
2 2 Tray Lower
+5VDC 5
3 3 Sensor
P/J16
PS12_ON
4 6 1 PS12
GND 7
5 2 Tray Upper
+5VDC 8
6 3 Sensor
7 NC
s6400mfp-563

Finisher Control
Board (FSCB)
CN8 CN1 P/J7
+5VDC PS10_ON
6 1 1 PS10
GND
5
+5VDC
2 2 Paper Level
4 3 3 Sensor 2
P/J6
PS9_ON
3 4 1 PS9
GND
2
+5VDC
5 2 Paper Level
1 6 3 Sensor 1
s6400mfp-560

WorkCentre 6400 Service Manual 3-95

Error Messages and Codes

Finisher Error

The Finisher adjusts the Main Tray to detect the ejected paper. The Finisher
has detected a problem because no paper was detected. The Paper Level
Sensor 1 (PS9) is not activated within a given period of time after the Tray up/
Down Motor (M6) is energized and the Tray Upper Sensor (PS12) is activated.

Applicable Chain-Link Code

■ 312.481.00: Finisher Paper Press Drive Failure

Initial Actions

■ Check the Tray Up/ Down Motor and drive coupling for damage or
obstructions.

■ Check the Tray Upper Sensor and Paper Level Sensor 1 Actuators for
damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Paper Level Sensor 1, PL36.14 012-309

■ Finisher Control Board, PL46.16
■ Tray Up/ Down Motor, PL48.02 012-057
■ Tray Upper Sensor, PL48.03 012-312
■ Main Tray Assembly, PL48.18

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Paper Level Sensor 1 work Go to step 3. Go to step 2.

properly in Diagnostics?
2 Is the following voltage present? Replace the Replace the
■ CN8FSCB-1 = 5Vdc Paper Level Finisher Control
Sensor 1 Board
(page 8-185). (page 8-205).
3 Does the Tray Up/ Down Motor Go to step 5. Go to step 4.
function properly in Diagnostics?
4 Is the Motor connector (PJ18) Go to step 7. Properly seat the
properly connected? connector.
5 Does the Tray Upper Sensor work Go to step 7. Go to step 4.
properly in Diagnostics?

3-96 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Is the following voltage present? Replace the Tray Replace the
■ CN5FSCB-6 = 5Vdc Upper Sensor. Finisher Control
Board
(page 8-205).
7 Replace the Finisher Main Tray Replace the Troubleshooting
Assembly (page 8-216). Finisher Control complete.
Does the error still occur? Board
(page 8-205).

Finisher Control
Board (FSCB)
CN8 CN1 P/J7
+5VDC PS10_ON
6 1 1 PS10
GND
5
+5VDC
2 2 Paper Level
4 3 3 Sensor 2
P/J6
PS9_ON
3 4 1 PS9
GND
2
+5VDC
5 2 Paper Level
1 6 3 Sensor 1
s6400mfp-560

WorkCentre 6400 Service Manual 3-97

Error Messages and Codes

Finisher Error

The Finisher Aligning Plate causes multiple sheets of paper exiting the Main
Tray to be properly aligned for stacking and stapling. The Finisher has
detected a problem with the movement or location of the Aligning Plate.
The Aligning Plate Home Position Sensor (PS6) is not activated or
deactivated within a given period of time after the printer is turned On or the
Align Motor (M2) is energized.

Applicable Chain-Link Code

■ 312.482.00: Finisher Alignment Plate Drive Failure

Initial Actions

■ Check the Align Motor and drive coupling for damage or obstructions.

■ Check the Aligning Plate Home Sensor Actuator for damage or

obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Align Motor, PL41.M2 012-017

■ Align Plate Home Sensor, PL41.PS6 012-306
■ Finisher Control Board, PL46.16

Note
The Exit Roller Up/ Down Motor (012-018) must be activated prior to
operating the Align Motor (012-017) to prevent potential damage.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Aligning Plate Home Position Go to step 3. Go to step 2.

Sensor work properly in Diagnostics?
2 Is the following voltage present? Replace the Replace the
■ CN9FSCB-4 = 5Vdc Finisher Finisher Control
Assembly Board
(page 8-182). (page 8-205).
3 Does the Align Motor function Replace the Go to step 4.
properly in Diagnostics? Finisher Control
Board
(page 8-205).
4 Is the Motor connector (CN4) properly Go to step 5. Properly seat
connected? the connector.

3-98 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the Finisher Control Board Replace the Properly seat
connector (CN12FSCB) properly Finisher the connector.
connected? Assembly
(page 8-182).

Finisher Control
Board (FSCB)
CN9 P/J5
+5VDC PS5_ON
9 1 PS5
GND
8
+5VDC
2 Paper Ejector
7 3 Sensor
P/J4
PS6_ON
6 1 PS6
5 GND
+5VDC
2 Aligning Plate Home
4 3 Position Sensor
P/J3
PS7_ON
3 1 PS7
GND
2
+5VDC
2 Storage Section
1 3 Sensor
s6400mfp-561

Finisher
Control Board
CN12
(FSCB)
5 NC CN4
B
4 1
B
2 M2
3
A M Align
2 3
A
1 4 Motor
s6400mfp-568

WorkCentre 6400 Service Manual 3-99

Error Messages and Codes

Finisher Error

The Finisher lowers the Paper Exit Roller mechanism into position to eject the
paper to the Main Tray. The Finisher has detected a problem with the
movement or location of the Exit Roller mechanism.
The Exit Roller Sensor (PS8) is not activated or deactivated within a given
period of time after the Exit Roller Up/ Down Motor (M5) is energized.

Applicable Chain-Link Code

■ 312.483.00: Finisher Eject Roller Contact Failure

Initial Actions

■ Check the Exit Roller Up/ Down Motor and drive coupling for damage or
obstructions.

■ Check the Exit Roller sensor actuator for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Exit Roller Up/Down Motor, PL47.05 012-018

■ Exit Roller Sensor, PL47.PS8 012-308
■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Exit Roller Up/ Down motor Go to step 4. Go to step 2.

function properly in Diagnostics?
2 Is the Motor connector (PJ14) Go to step 3. Properly seat the
properly connected? connector.
3 Is the Finisher Control Board Go to step 6. Properly seat the
connector (CN20FSCB) properly connector.
connected?
4 Does the Exit Roller Sensor work Go to step 6. Go to step 5.
properly in Diagnostics?
5 Is the following voltage present? Replace the Exit Replace the
■ CN2FSCB-1 = 5Vdc Roller Sensor. Finisher Control
Board
(page 8-205).

3-100 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Replace the Finisher Control Board Replace the Exit Troubleshooting
(page 8-205). Roller Up/ Down complete.
Does the error still occur? Motor
(page 8-213).

Finisher Control
Board (FSCB) CN2
4 NC P/J11
+5VDC PS8_ON
3 1 PS8
GND
2 2 Exit Roller
+5VDC
1 3 Sensor
s6400mfp-559

Finisher Control
Board (FSCB)
+24VDC

CN20 P/J14
+24VDC
6 6
+24VDC
5 5 M5
A
4
A
4 M Exit Roller
3 3 Up/Down Motor
B
2 2
B
1 1
s6400mfp-565

WorkCentre 6400 Service Manual 3-101

Error Messages and Codes

Finisher Error

The Finisher Aligning Belt causes multiple sheets of paper exiting the Main
Tray to be properly aligned for stacking and stapling. The Finisher has
detected a problem with the movement or location of the Aligning Belt.
The Aligning Belt Sensor (PS11) is not activated or deactivated within a given
period of time after the Aligning Belt Up/ Down Solenoid (SL3) is energized.

Applicable Chain-Link Code

■ 312.484.00: Finisher Storage Belt Contact Failure

Initial Actions

■ Check the Exit Roller Up/ Down Motor and drive coupling for damage or
obstructions.

■ Check the Exit Roller Sensor Actuator for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Aligning Belt Sensor, PL46.02 012-311

■ Align Belt Up/Down Solenoid, PL46.04 012-157
■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Aligning Belt Up/ Down Go to step 3. Go to step 2.

Solenoid function properly in
Diagnostics?
2 Is the Finisher Control Board Go to step 7. Properly seat the
connector (CN19FSCB) properly connector.
connected?
3 Does the Aligning Belt Sensor work Go to step 7. Go to step 4.
properly in Diagnostics?
4 Is the Finisher Control Board Go to step 5. Properly seat the
connector (CN11FSCB) properly connector.
connected?
5 Is the Aligning Belt Sensor connector Go to step 6. Properly seat the
(PJ1) properly connected? connector.

3-102 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Is the following voltage present? Replace the Replace the
■ CN11FSCB-1 = 5Vdc Aligning Belt Finisher Control
Sensor. Board
(page 8-205).
7 Replace the Finisher Control Board Replace the Troubleshooting
(page 8-205). Aligning Belt Up/ complete.
Does the error still occur? Down Solenoid
(.page 8-204).

Finisher
Control Board
(FSCB) CN11
4 NC P/J1
+5VDC PS11_ON
3 1 PS11
GND
2 +5VDC 2 Aligning Belt
1 3 Sensor
s6400mfp-562

Finisher Control
Board +24VDC CN19
(FSCB) SL3 ON SL3
2 +24VDC Aligning Belt
1
Up/Down Solenoid
s6400mfp-566

WorkCentre 6400 Service Manual 3-103

Error Messages and Codes

Finisher Error

The Finisher has completed stacking or stapling multiple sheets of paper and
has detected a problem while ejecting the paper to the Main Tray. The Paper
Ejector Sensor (PS5) is not activated within a given period of time after the
Paper Ejector Motor (M1) is energized.

Applicable Chain-Link Code

■ 312.485.00: Finisher Bundle Eject Motor Failure

Initial Actions

■ Check the Paper Ejector Motor and drive coupling for damage or
obstructions.

■ Check the Paper Ejector Sensor Actuator for damage or obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Assembly, PL35.09

■ Paper Ejector Motor, PL41.M1 012-016
■ Paper Ejector Sensor, PL41.02 012-305
■ Finisher Control Board, PL46.16

Note
The Exit Roller Up/ Down Motor (M5) must be activated prior to operating
the Paper Ejector Motor (M1) to prevent potential damage.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Paper Ejector Motor Go to step 4. Go to step 2.

function properly in Diagnostics?
2 Is the Motor connector (PJ15) Go to step 3. Properly seat the
properly connected? connector.
3 Is the Finisher Control Board Go to step 7. Properly seat the
connector (CN21FSCB) properly connector.
connected?
4 Does the Paper Ejector Sensor Go to step 7. Go to step 5.
function properly in Diagnostics?
5 Is the Finisher Control Board Go to step 6. Properly seat the
connector (CN9FSCB) properly connector.
connected?

3-104 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

6 Is the following voltage present? Replace the Replace the
CN9FSCB-7 = 5Vdc Paper Ejector Finisher Control
Sensor Board
(page 8-199). (page 8-205).
7 Replace the Finisher Control Board Replace the Troubleshooting
(page 8-205). Finisher complete.
Does the error still occur? Assembly
(page 8-182).

Finisher Control
Board (FSCB) CN21 P/J15
B
6 6
B
+24VDC
5 5 M1
A
4
A
4 M Paper Ejector
3 3 Motor
+24VDC
2 2
+24VDC
1 1
s6400mfp-564

WorkCentre 6400 Service Manual 3-105

Error Messages and Codes

Paper Jam in the Finisher Transport Area

The Finisher has detected a paper jam while transporting the paper to the
Main or Sub Tray. The Finisher Entrance Sensor (PS1) was not unblocked
after a given amount of time after the paper has blocked the Finisher Entrance
Sensor (PS1).

Applicable Chain-Link Code

■ 312.487.00: Jam at Finisher Transport Area

Initial Actions

■ Open the Front Door and lift the Control Panel to check the Horizontal
Transport area for any obstructions, paper, damage, or debris.

■ Lift the Finisher Top Cover and check for any obstructions, paper,
damage, or debris.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Upper and Lower Horizontal Transport Rollers, as needed.

■ Check the Sensor Actuators for proper function and obstructions.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Entrance Sensor, PL38.10 012-301

■ Finisher Control Board, PL46.16
■ Transport Motor, PL46.20 012-003

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Actuator, PL19.09 excessively worn
■ Horizontal Transport - Upper, parts.
PL17.37
■ Transport Rollers, PL39.16

2 Does the Entrance Sensor work Go to step 5. Go to step 3.

properly in Diagnostics?
3 Is the Entrance Sensor connector Go to step 4. Properly seat the
(PJ2) and the FSC Board connector connector.
(CN10FSCB) properly connected?

3-106 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the following voltage present? Replace the Replace the FSC
■ CN10FSCB - 1 = 5Vdc Entrance Sensor Board
(page 8-189). (page 8-205).
5 Does the Finisher Transport Motor Replace the Replace the FSC
work properly in Diagnostics? Finisher Board
Transport Motor (page 8-205).
(page 8-206).

Finisher
Control Board
(FSCB)
CN10 P/J2
+5VDC PS1_ON
3 1 PS1
GND
2
+5VDC
2 Entrance
1 3 Sensor
s6400mfp-932

WorkCentre 6400 Service Manual 3-107

Error Messages and Codes

Paper Jam at Finisher Top Output Tray

The Finisher has detected a paper jam at the Sub Tray. The Finisher Entrance
Sensor (PS1) is not unblocked after a given period of time after the Finisher
Transport Section Sensor (PS2) is blocked. The Finisher Transport Section
Sensor (PS2) is not unblocked after a given period of time after the Finisher
Entrance Sensor (PS1) is unblocked.

Applicable Chain-Link Code

■ 312.488.00: Jam at Finisher Upper Output Tray

Initial Actions

■ Ensure the Finisher is installed properly and the connector is properly

seated.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Clean the Upper and Lower Finisher Transport Rollers, as needed.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Entrance Sensor, PL38.10 012-301

■ Finisher Transport Section Sensor, PL39.14 012-302
■ Finisher Control Board, PL46.16
■ Transport Motor, PL46.20 012-003

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Finisher Entrance Sensor Actuator, excessively worn
PL38.12 parts.
■ Transport Roller Assy, PL38.21

■ Finisher Transport Section Sensor

Actuator, PL39.13
■ Transport Rollers, PL39.16

2 Does the Finisher Entrance Sensor Go to step 5. Go to step 3.

work properly in Diagnostics?
3 Is the Entrance Sensor connector Go to step 4. Properly seat the
(PJ2) and the FSC Board connector connector.
(CN10FSCB) properly connected?

3-108 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the following voltage present? Replace the Replace the FSC
■ CN10FSCB-1 = 5Vdc Finisher Board
Entrance Sensor (page 8-205).
(page 8-189).
5 Does the Finisher Transport Section Go to step 8. Go to step 6.
Sensor work properly in
Diagnostics?
6 Is the Transport Sensor connector Go to step 7. Properly seat the
(PJ9) and the FSC Board connector connector.
(CN6FSCB) properly connected?
7 Is the following voltage present? Replace the Replace the FSC
■ CN6FSCB-1 = 5Vdc Finisher Board
Transport (page 8-205).
Section Sensor.
8 Does the Finisher Transport Motor Replace the Replace the FSC
work properly in Diagnostics? Finisher Board
Transport Motor (page 8-205).
(page 8-206).

Finisher Control
Board (FSCB) CN6
8 NC
7 NC P/J10
+5VDC PS3_ON
6 1 PS3
GND
5
+5VDC
2 Finisher Cover
4 3 Sensor
P/J9
PS2_ON
3 1 PS2
GND
2
+5VDC
2 Transport Section
1 3 Sensor
s6400mfp-936

Finisher
Control Board
(FSCB)
CN10 P/J2
+5VDC PS1_ON
3 1 PS1
GND
2
+5VDC
2 Entrance
1 3 Sensor
s6400mfp-932

WorkCentre 6400 Service Manual 3-109

Error Messages and Codes

Paper Jam at Finisher Main Output Tray

The Finisher has detected a paper jam at the Main Tray. The Finisher
Entrance Sensor (PS1) is not unblocked after a given period of time after the
Finisher Storage Section Sensor (PS7) is blocked. The Finisher Storage
Section Sensor (PS7) is not unblocked after a given period of time after the
Finisher Entrance Sensor (PS1) is unblocked.

Applicable Chain-Link Code

■ 312.489.00: Jam at Finisher Stacker Output Tray

Initial Actions

■ Ensure the Finisher is installed properly and the connector is properly

seated.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Entrance Sensor, PL38.10 012-301

■ Storage Section Sensor, PL41.02 012-307
■ Finisher Control Board, PL46.16
■ Exit Motor, PL46.20 012-004

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the following for evidence of Replace any Go to step 2.

fault or damage: damaged or
■ Finisher Entrance Sensor, PL38.10 excessively worn
■ Finisher Storage Section Sensor, parts.
PL41.02
■ Roller Assembly, PL44.15

2 Does the Finisher Entrance Sensor Go to step 5. Go to step 3.

work properly in Diagnostics?
3 Is the Entrance Sensor connector Go to step 4. Properly seat the
(PJ2) and the FSC Board connector connector.
(CN10FSCB) properly connected?
4 Is the following voltage present? Replace the Replace the FSC
■ CN10FSCB-1 = 5Vdc Finisher Board
Entrance Sensor (page 8-205).
(page 8-189).

3-110 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Does the Finisher Storage Section Go to step 8. Go to step 6.
Sensor work properly in
Diagnostics?
6 Is the Storage Section Sensor Go to step 7. Properly seat the
connector (PJ3) and the FSC Board connector.
connector (CN9FSCB) properly
connected?
7 Is the following voltage present? Replace the Replace the FSC
■ CN9FSCBU-1 = 5Vdc Finisher Storage Board
Section Sensor. (page 8-205).
8 Does the Finisher Exit Motor work Replace the Exit Replace the FSC
properly in Diagnostics? Transport Motor Board
(page 8-209). (page 8-205).

Finisher
Control Board
(FSCB)
CN10 P/J2
+5VDC PS1_ON
3 1 PS1
GND
2
+5VDC
2 Entrance
1 3 Sensor
s6400mfp-932

WorkCentre 6400 Service Manual 3-111

Error Messages and Codes

Staple Jam in the Finisher

The Stapler does not return to the Home position after a given period of time
after the Staple Motor starts to drive.

Applicable Chain-Link Code

■ 312.491.00: Stapler Jam

Initial Actions

■ Remove the Staple Cartridge and check for any obstructions, damage, or
debris.

■ Remove any obstructions or debris in the paper path and cycle printer
power.

■ Replace the Staple Cartridge with a new one.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Staple Assembly, PL45.11 012-129

■ Finisher Control Board, PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Staple Motor work properly Replace the Go to step 2.

in diagnostics? Staple Assembly
(page 8-201).
2 Are the Staple Unit connectors (PJ19 Go to step 3. Properly seat the
& PJ20) properly connected? connector.
3 Is the Staple Assembly connector Go to step 4. Properly seat the
(CN9) and the FSC Board connector connector.
(CN23FSCB) properly connected?
4 Is the following voltage present? Replace the Replace the FSC
■ CN23FSCB-1 = 5Vdc Staple Assembly Board
(page 8-201). (page 8-205).

3-112 WorkCentre 6400 Service Manual

Error Messages and Codes

Finisher Control
Board (FSCB) CN23 CN9 P/J20
GND
1 1
Staple Unit
9
STLS
8 2 2
+5VDC STREADY
7 3 3
STHP
6 4 4
DC5V
5 5 5
P/J19
Staple Motor- 6 4
4
Staple Motor-
3 7 3
Staple Motor+
2 8 2
Staple Motor+
1 9 1
s6400mfp-937

WorkCentre 6400 Service Manual 3-113

Error Messages and Codes

Scanner Fault

The Scanner has reported a failure or is not performing as expected.

Applicable Chain-Link Codes

■ 314.002.00: Scanner Missing

■ 362.010.00: IISS/ Scanner - Controller Communication Fail

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the Image Processor Board with the 2 standoff screws.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Scanner, PL2.01
■ LVPS, PL10.07
■ Image Processor Board, PL20.07

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Image Processor Board (J401) Go to step 2. Properly seat the
to MCU Board (PJ24) ribbon cable connector.
properly connected?
2 Does the CN_SCANNER connector Go to step 3. Go to step 4.
have 24Vdc (see “Voltage Chart” on
page 3-115)?
3 Replace the Scanner (page 8-42). Replace the Troubleshooting
Does the error still occur? Image Processor complete.
Board
(page 8-98).

3-114 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is CN_SCN2 properly connected to Follow the Properly seat the
the LVPS Board? “DC Power connector.
Supply
Troubleshooting”
on page 4-59 in
Chapter 4.

Voltage Chart

GND 3.3v GND 24.0v

(Green) (Yellow) (Green) (Red)

GND 11.0v GND 5.0v

(Green) (Pink) (Green) (Yellow)

WorkCentre 6400 Service Manual 3-115

Error Messages and Codes

Document Feeder (DADF) Disconnected

The Document Feeder (DADF) to Scanner Interface cable is disconnected.

Applicable Chain-Link Code

■ 314.005.00: Document Feeder Disconnected

Initial Actions

■ Turn off the printer power switch and raise the Document Feeder to
access the DADF to Scanner interface cable.

■ Remove the connector cover (Scanner side) then completely remove and
reseat interface cable.

■ Turn On the printer power switch.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ DADF Assy, PL1.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the external interface cable Replace the Reseat the

between the DADF (J1DFCB) and the DADF Assembly interface
Scanner main body (PJ3IPB) seated (page 8-38). connector.
correctly and undamaged?

3-116 WorkCentre 6400 Service Manual

Error Messages and Codes

Scanner Fault

The Document Feeder (DADF) or Document Glass registration manual

calibration routine failed.

Applicable Chain-Link Codes

■ 315.009.00: IIT Manual Calibration Fail

■ 315.010.00: IIT Manual Calibration Fail - Lead Edge Fail

■ 315.011.00: IIT Manual Calibration Fail - Side Edge Fail

■ 315.012.00: IIT Manual Calibration Fail - Shading Target Fail

Initial Actions

■ Check the DADF Assy for correct installation.

■ Check the DADF paper path for obstructions or debris.

■ Make sure the calibration target is undamaged (no creases or tears).

■ Ensure the calibration target sheet is loaded correctly and rerun the
calibration routine.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ DADF Roller Kit, PL1.03

■ Scanner Assy, PL2.01
■ Calibration Target Sheet, P/N 109K02300

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the registration calibration Go to step 2. Go to step 6.

routine pass when performed from
the Document Glass (Flatbed)?
2 Does the registration calibration Troubleshooting Go to step 3.
routine pass when performed from complete.
the Document Feeder (DADF)?
3 Is the Separation Pad (PL1.01) and Go to step 4. Clean or replace
Separation Roller (PL1.02) clean and the affected
free of defects? parts.

WorkCentre 6400 Service Manual 3-117

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the calibration target and 3 Go to step 5. Replace the
sheets of media feed correctly into DADF Roller Kit
the DADF Assembly once the (page 8-31,
calibration routine is initiated? page 8-40).
5 Check the CVT window for debris, Troubleshooting Replace the
obstructions, and cleanliness. complete. Scanner
Does the calibration routine pass? Assembly
(page 8-42).
6 Run the Registration Calibration Go to step 7. Replace the
through the DADF (page 6-15). Scanner
Does the routine pass? Assembly
(page 8-42).
7 Is the Scanner interface cable Go to the Remove and
connector correctly seated and “Scanner Fault reseat the cable.
secured to the Image Processor Troubleshooting”
Board with the 2 standoff screws? on page 4-63
and troubleshoot
the Scanner.

3-118 WorkCentre 6400 Service Manual

Error Messages and Codes

Internal Communication Error

One of the printer circuit boards has encountered a communication problem

internally or with another internal printer component.

Note
In most cases, these events are recovered automatically by the system
software and do not degrade system performance in any noticeable way.
Before following this procedure check to confirm no messages are in
Machine Status -> Tools -> Faults -> Current Faults -> Current
Messages. If the only indication of this fault is from dc120 (Fault
Counters) in Diagnostics and all printer functions perform normally do not
proceed.

Applicable Chain-Link Code

■ 316.xxx.xx: Various internal communication errors (Reference Appendix

A (page A-1) to determine which 316-xxx-xx fault codes follow this
troubleshooting procedure).

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ NC HDD, PL20.03
■ Image Processor Board, PL20.07
■ NC RAM, PL20.44
■ Hard Drive Cable, PL20.46

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Send a different job to the printer Reload the Go to step 2.

from the same computer. printer driver on
Does the error still occur? the computer.
2 Send the original job from a different Go to step 3. Reload the
computer. printer driver on
Does the error still occur? the original
computer.
3 Reload the printer software. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Replace the NC RAM (page 8-117). Go to step 5. Troubleshooting
Does the error still occur? complete.

WorkCentre 6400 Service Manual 3-119

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Replace the NC Hard Drive and cable Replace the Troubleshooting
(page 8-91). Image Processor complete.
Does the error still occur? Board
(page 8-98).

3-120 WorkCentre 6400 Service Manual

Error Messages and Codes

Network Controller Internal Error

The Network Controller (embedded within the Image Processor Board) has
detected an internal communication error with another component within the
Image Processor Board.

Applicable Chain-Link Code

■ 316.xxx.xx: Various Network Controller Internal Errors (Reference

Appendix A (page A-1) to determine which 316-xxx-xx fault codes follow
this troubleshooting procedure).

Initial Actions

■ Power cycle the printer.

■ If the printer has multiple network protocols enabled and the issue is
specific to only one, confirm the settings for the protocol.

■ Confirm the printer is in online mode.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 On the Configuration Report, verify the Go to step 2. In Machine
following: Status -> Tools
Image Overwrite, Immediate: -> Security
Installed/Enabled Settings ->
Image
Overwrite
Security ->
Immediate
Overwrite,
select Enable.

WorkCentre 6400 Service Manual 3-121

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 Did the problem occur while Go to step 3. Go to step 4.
performing a scan job?
3 Compare the templates on the printer Go to step 4. Replace the
to the ones on the WebUI. missing
Are the template lists identical? template on the
PC and update
so the printer
will receive it.
4 Is the network cable properly Go to step 5. Properly seat
connected to the printer? the connector.
5 In Diagnostics, perform the dc312 Proceed to Check network
Network Echo Test (page 4-26). “Internal connections
Does the test complete successfully? Communication and
Error” on configuration.
page 3-119 in
Chapter 3.

3-122 WorkCentre 6400 Service Manual

Error Messages and Codes

Out of Memory

Out of Memory with greater than one job in EPC.

Applicable Chain-Link Code

■ 319.403.00: Out of Memory - Job in EPC

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ RAM, PL20.44

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Rerun the scan job. Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Power cycle the printer. Replace the CC Break the scan
Does the job status button flash two RAM job into smaller
times in a row? (page 8-117). jobs and run
them
individually.

WorkCentre 6400 Service Manual 3-123

Error Messages and Codes

Fax Services Cannot Register/ Unregister

The printer has reported a Fax hardware or software error.

Applicable Chain-Link Codes

■ 320.302.00: Fax Card Hardware or Software Error

■ 320.303.00: Fax Card Hardware or Software Error

■ 320.305.00: Fax Card Hardware or Software Error

■ 320.701.00: Phone Book Download Failed

■ 322.371.00: Fax Application Registration Error

■ 322.372.00: Fax application Un-registration Error

Initial Actions

■ Power cycle the printer.

■ Confirm the printer powers up to the "ready" state.

■ Print a Configuration report and ensure Embedded Fax is Installed/

Enabled.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Fax Board, PL20.42

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Is the Fax Feature enabled? Go to step 3. Enable the Fax
Feature.
3 Go to the “Fax Troubleshooting” on Replace the FAX Modify settings.
page 4-65 and check the Fax Board
Transmit/ Receive menu settings are (page 8-115).
correct.
Are the settings correct?

3-124 WorkCentre 6400 Service Manual

Error Messages and Codes

A Fax Memory Error has Occurred

The printer has reported a Fax Memory error, a Fax Memory is Low condition,
or another unrecoverable fax error.

Applicable Chain-Link Codes

■ 320.320.00: Unrecoverable Fax Fault not cleared by Card Reset

■ 320.322.00: NV Device not fitted to Basic Fax Card

■ 320.323.00: Fax System Memory is Low

■ 320.324.00: Not Enough Memory to use Fax Service

■ 320.327.00: Registers cannot be accessed on the Extended Card

■ 320.339.00: Basic Card Problem

■ 320.341.00: Miscellaneous Basic Card Problem

■ 320.342.00: Error Accessing File on NVM Device

Initial Actions

■ Power cycle the printer.

■ Confirm the printer powers up to the "ready" state.

■ Print a Configuration report and ensure Embedded Fax is Installed/

Enabled.

■ For a "Memory Low" or "Not Enough Memory" condition; delete

unnecessary mailbox files or fax jobs stored for polling.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Fax Board, PL20.42

Note
The CC HDD has a dedicated partition where fax images are stored
explicitly for polling, mailboxes, or waiting for resources. The partition can
store up to 2KB of compressed images before a memory low message
will occur.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Fax Feature enabled? Go to step 2. Enable the Fax

Feature.

WorkCentre 6400 Service Manual 3-125

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 Check the printer receiving the fax. Go to step 3. Load paper.
Is the appropriate paper loaded in the
designated paper tray?
3 Is the error related to a "low" or "not Go to step 4. Go to step 5.
enough" memory condition?
4 Check the “Received” and “Stored” * Change the Go to step 5.
Document settings in the Mailbox setting to "Keep
and Polling policies folder. 1-72 Hours” or
Is the “Keep Forever” radial button “Delete on Print".
selected?
5 Go to the “Fax Troubleshooting” on Replace the FAX Modify settings.
page 4-65 and check the Fax Board
Transmit/ Receive menu settings are (page 8-115).
correct.
Are the settings correct?
* Be sure to notify the customer that keeping all faxes forever may eventually
contribute to memory problems and the setting has been changed.

3-126 WorkCentre 6400 Service Manual

Error Messages and Codes

Fax Line 1 Unavailable or No Dial Tone Detected

The printer has reported Fax line 1 is unavailable or no dial tone is detected.

Applicable Chain-Link Codes

■ 320.331.00: No Communication via PSTN1 port

■ 320.338.00: Fax Communication Error at Power Up or Re-boot

■ 320.350.00: No Dial Tone Warning

■ 320.351.00: No Dial Tone Error

Initial Actions

■ Power cycle the printer.

■ Check the Fax phone line is undamaged and securely in place.

■ Confirm the printer powers up to the "ready" state.

■ Print a Configuration report and ensure Embedded Fax is Installed/

Enabled.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Fax Board, PL20.42

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Fax Feature enabled? Go to step 2. Enable the Fax

Feature.
2 Enable Audio Line Monitor in the Go to step 4. Go to step 3.
Tools -> Service Settings ->
Embedded Fax Settings ->
TransmissionDefaults menu.
Do you hear a dial tone prior to the
phone number dialing?
3 Check the Fax line using a phone Go to step 4. Inform the
connected to the same line. customer the
Do you hear a dial tone? phone line
requires service.

WorkCentre 6400 Service Manual 3-127

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Go to the “Fax Troubleshooting” on Replace the FAX Modify settings.
page 4-65 and check the Fax Board
Transmit/ Receive menu settings are (page 8-115).
correct.
Are the settings correct?

3-128 WorkCentre 6400 Service Manual

Error Messages and Codes

Network Controller Error

The printer is unable to communicate with Xerox Standard Accounting (XSA)

database.

Applicable Chain-Link Code

■ 322.370.00: Unable to communicate with XSA Database

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the network cable properly Use the System Properly seat the
installed? Administrators connector.
Guide (SAG) to
setup the XSA
configuration.

WorkCentre 6400 Service Manual 3-129

Error Messages and Codes

Output Device Configuration Mismatch

The printer has detected that an Output Device (Finisher, OCT, one or more
Mailboxes or no output device configured) has changed during the Power On
sequence.

Applicable Chain-Link Code

■ 322.750.00: Output Device Configuration Mismatch

Initial Actions

■ Check all output devices for correct configuration.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are the output device connections Power cycle the Properly

properly configured and connected. printer. configure and
seat the
connector.

3-130 WorkCentre 6400 Service Manual

Error Messages and Codes

System Fault

The Imaging Processor Board has detected the Cooling Fan is not operating.

Applicable Chain-Link Code

■ 342.045.00: Print Board Control Fan has an error and is Off.

Initial Actions

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Image Processor Board, PL20.07

■ Cooling Fan, PL20.11 042-045

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Replace the Cooling Fan Replace the Troubleshooting

(page 8-153). Image Processor complete.
Does the error still occur? Board
(page 8-98).

WorkCentre 6400 Service Manual 3-131

Error Messages and Codes

Tray 3 or Tray 4 Right Side Door is Open

The printer has reported the Tray 3 or Tray 4 Right Side Door is open. The
Right Side Door is Open Message is triggered when the Right Door Sensor
(PS24) logic indicates the door is open.

Applicable Chain-Link Codes

■ 377.305.00: Tray 3 Right Side Door is Open

■ 377.306.00: Tray 4 Right Side Door is Open

Initial Actions

■ Open the appropriate Tray's Right Side Door and check for obstructions or
physical damage.

■ Check the affected Tray's Right Side Door for correct open/ close
movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LTA Control (PCCB) Board, PL28.11

■ Optional Feeder, PL28.25 (tray not included)
■ Right Door Sensor (PS24), PL29.11 073-203/ 074-203
■ Wire Harness, PL29.25

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the affected Tray's Right Door Go to step 2. Go to step 3.

Sensor in Diagnostics.
Does the Sensor state change?
2 Check the Sensor Flag on the Right Replace the Go to step 3.
Door for damage. Optional Feeder
Is there damage noted? (page 8-166).
3 Is there continuity between PJ5PCCB Go to step 4. Replace the
and PJ28 (PS24)? wiring harness.
4 Replace the Right Door Sensor PS24. Replace the LTA Troubleshooting
Does the error still occur? Control (PCCB) complete.
Board
(page 8-161).

3-132 WorkCentre 6400 Service Manual

Error Messages and Codes

WorkCentre 6400 Service Manual 3-133

Error Messages and Codes

Close Duplex Door

The printer has reported that the Duplex Door is open. This message is
triggered when the Duplex Door Sensor (PS16) logic indicates the door is
open.

Applicable Chain-Link Code

■ 377.307.00: Duplex Door is Open

Initial Actions

■ Open the Duplex Door and check for obstructions or physical damage.

■ Check the Duplex Door for correct open/ close movement.

■ Completely remove and reinstall the Duplex unit.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Duplex Door Sensor (PS16), PL22.16 077-305

■ Duplex Unit (complete Assy), PL22.23
■ Duplex Control Board (ADCB), PL23.12
■ Wire Harness, PL23.21

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Duplex Door (Duplex Cover) Go to step 2. Go to step 3.

Sensor in Diagnostics.
Does the Sensor state change?
2 Check the flag on the Duplex Door Replace the Go to step 3.
(PL22.1) for damage. Duplex Unit
Is there damage noted? (page 8-175).
3 Replace the Duplex Door Sensor Go to step 4. Troubleshooting
(PS16). complete.
Does the error still occur?
4 Is there continuity between PJ4ADCB Replace the Replace the
and the Duplex Door Sensor (PS16)? Duplex Control Duplex Unit
Board (ADCB) (page 8-175).
(page 8-177).

3-134 WorkCentre 6400 Service Manual

Error Messages and Codes

Duplex Control
Board (ADCB)
+5VDC

P/J4 P/J25
+5VDC PS16
1 3
GND
2 2 Door
PS16_ON
3 1 Sensor
s6400mfp-939

WorkCentre 6400 Service Manual 3-135

Error Messages and Codes

Close Finisher Top Cover

The printer has reported that the Finisher Top Cover is open. This message is
triggered when the Top Cover Sensor (PS3) logic indicates the cover is open.

Applicable Chain-Link Code

■ 377.308.00: Finisher Top Door is Open

Initial Actions

■ Open the Finisher Top Cover and check for obstructions or physical
damage.

■ Check the Top Cover for correct open/ close movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Finisher Top Cover Assy, PL38.03

■ Finisher Cover Sensor (PS3), PL39.14 012-283
■ Wire Harness, PL39.15
■ Finisher Control Board (FSCB), PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Finisher Cover Sensor (PS3) Go to step 2. Go to step 3.

in Diagnostics.
Does the sensor state change?
2 Check the sensor flag on the Finisher Replace the Go to step 3.
Top Cover Assembly for damage. Finisher Top
Is there damage noted? Cover.
3 Replace the Finisher Cover Sensor Go to step 4. Troubleshooting
(PS3). complete.
Does the error still occur?
4 Is there continuity between CN6FSCB Replace the Replace the
and PJ10 (PS3)? Finisher Control wiring harness.
Board (FSCB)
(page 8-205).

3-136 WorkCentre 6400 Service Manual

Error Messages and Codes

Finisher Control
Board (FSCB) CN6
8 NC
7 NC P/J10
+5VDC PS3_ON
6 1 PS3
GND
5
+5VDC
2 Finisher Cover
4 3 Sensor
P/J9
PS2_ON
3 1 PS2
GND
2
+5VDC
2 Transport Section
1 3 Sensor
s6400mfp-936

WorkCentre 6400 Service Manual 3-137

Error Messages and Codes

Lower the Control Panel Door

The printer has reported that the Control Panel Door is open. This message is
triggered when the Scanner Unit Open Sensor (PS11) logic indicates the
Control Panel Door (used to access the Horizontal Transport area under the
Scanner) is open.

Applicable Chain-Link Code

■ 377.309.00: Control Panel Door Open

Initial Actions

■ Open the Control Panel Door and check for obstructions or physical
damage.

■ Check the Control Panel Door for correct open/ close movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Scanner Lock Latch, PL2.05

■ Scanner Unit Open Sensor (PS11) Kit, PL4.23 077-309
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Inspect the Scanner Lock Latch Replace the Go to step 2.

(PL2.05) for correct installation or Scanner Lock
damage. Latch.
Is any damage noted?
2 Test the Scanner Unit Open Sensor Go to step 3. Replace the
(PS11) in Diagnostics. Scanner Unit
Does the Sensor state change? Open Sensor Kit.
3 Are the MCU connector PJ31MCU Replace the MCU Properly seat the
and Sensor connector PJ21 properly Board connectors.
connected? (page 8-101).

Engine Control
Board
+5VDC

(MCU) P/J31 P/J34 PS11

+5VDC
1 3 Scanner Unit
GND
2
PS11_ON
2 Open/Close
3 1 Sensor
s6400mfp-539

3-138 WorkCentre 6400 Service Manual

Error Messages and Codes

The Finisher Front Door is Open

The printer has reported that the Finisher Front Door is open. This message is
triggered when the Front Door (Stapler Cover) Switch (MS1) logic indicates
the cover is open.

Applicable Chain-Link Code

■ 377.310.00: Finisher Front Door Open

Initial Actions

■ Open the Finisher Front Door and check for obstructions or physical
damage.

■ Check the Front Door for correct open/ close movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Component
Applicable Parts Control Code

■ Finisher (complete Assy), PL35.09

■ Wire Harness, PL37.05
■ Finisher Front Door (Stapler Cover) Switch (MS1), PL37.08 012-284
■ Finisher Control Board (FSCB), PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Finisher Front Door Switch Go to step 2. Go to step 3.

(MS1) in Diagnostics.
Does the Switch state change?
2 Check the flag on the Finisher Front Replace the Go to step 3.
Door (PL35.06) for damage. Finisher
Is there damage noted? Assembly
(page 8-182).
3 Replace the Finisher Front Door Go to step 4. Troubleshooting
Switch (MS1). complete.
Does the error still occur?
4 Is there continuity between Replace the Replace the
CN24FSCB and the Front Door Finisher Control Finisher
Switch (MS1)? Board (FSCB) Assembly
(page 8-205). (page 8-182).

WorkCentre 6400 Service Manual 3-139

Error Messages and Codes

Finisher
Control Board
(FSCB)
+24VDC

CN24
+24VDC MS1
2 +24VDC Stapler Cover
1
Switch
s6400mfp-940

3-140 WorkCentre 6400 Service Manual

Error Messages and Codes

Document Feeder Cover is Open

The printer has reported that the DADF Document Feeder Cover is open. This
message is triggered when the Document Feeder Cover Open Sensor (PS1)
logic indicates the cover is open.

Applicable Chain-Link Code

■ 377.311.00: Document Feeder Cover Open

Initial Actions

■ Open the Document Feeder Cover and check for obstructions or physical
damage.

■ Check the Document Feeder Cover for correct open/ close movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Component Control
Applicable Parts Code

■ DADF Top Cover Assy, PL1.05

■ DADF Assy, PL1.06
■ Document Feeder Cover Open Sensor (PS1), PL39.14 005-106

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Document Feeder Sensor Replace the Replace the

(PS1) in Diagnostics. DADF Top Cover DADF Assembly
Does the Sensor state change? Assembly (page 8-38).
(page 8-35).

WorkCentre 6400 Service Manual 3-141

Error Messages and Codes

The Right Side Door is Open

The printer has reported that The Right Side Door is open. This message is
triggered when the Right Door Sensor (PS3) logic indicates the door is open.

Applicable Chain-Link Code

■ 377.312.00: Right Side Door Open

Initial Actions

■ Open the Right Side Door and check for obstructions or physical damage.

■ Check the Right Side Door for correct open/ close movement.
■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Right Door Sensor (PS3) PL11.04 077-301

■ Vertical Transport Assy (Right Door), PL15.01
■ MCU Board, PL20.09
■ Wire Harness, PL25.02

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Test the Right Door Sensor (PS3) in Go to step 2. Go to step 3.

Diagnostics.
Does the Sensor state change?
2 Check the Sensor Flag on the Vertical Replace the Go to step 3.
Transport Assy (Right Door) for Vertical
damage. Transport
Is there damage noted? Assembly
(page 8-61).
3 Replace the Right Door Sensor PS3. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Is there continuity between Replace the MCU Replace the
PJ10MCU and PJ10 (PS3)? Board wiring harness.
(page 8-101).

3-142 WorkCentre 6400 Service Manual

Error Messages and Codes

WorkCentre 6400 Service Manual 3-143

Error Messages and Codes

Duplex Unit Error

The IOT has lost communication with the Duplex Unit. The Dup_Set_Detect
(PJ11MCU pin 14) signal indicates the Duplex Unit is missing or incorrectly
installed.

Applicable Chain-Link Code

■ 377.313.00: Communication error with Duplex Unit, may be disconnected

or not installed

Initial Actions

■ Completely remove and reinstall the Duplex Unit.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Component Control
Applicable Parts Code

■ Wire Harness Assy (CN14A/B-PJ11), PL15.21

■ MCU Board, PL20.09
■ Duplex Control Board (ADCB), PL23.12
■ Wire Harness Assy ((CN14A/CN14B-PJ1ADCB), PL23.23

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check The Bulkhead connectors on Replace the Go to step 2.

PL15.21 and PL23.23 for damage. affected wiring
Is any damage noted? harness.
2 Is there continuity between PJ1ADCB Go to step 3. Replace the
and CN14A/B? wiring harness.
3 Replace the Duplex Control Board Go to step 4. Troubleshooting
(ADCB) (page 8-177). complete.
Does the error still occur?
4 Is there continuity between Replace the MCU Replace the
PJ11MCU and CN14A/B? Board wiring harness.
(page 8-101).

3-144 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board
(MCU)
+5VDC P/J11 CN14B P/J1 Duplex
GND
1 7 7 Unit
DUP_TRANSPORT_M_A
2 6 6
DUP_TRANSPORT_M_B (ADCB)
3 5 5
DUP_TRANSPORT_M_EN
4 4 4
+24VDC +5VDC
5 3 3
DUP_GAIN_CHANGE
6 2 2
+24VDC
7 1 1

CN14A P/J2
GND
8 7 7
DUP_REVERSE_M_A
9 6 6
DUP_REVERSE_M_B
10 5 5
DUP_REVERSE_M_EN
11 4 4
DUP_PIC_SENS
12 3 3
DUP_OPEN_SENS
13 2 2
DUP_SET_DET
14 1 1
s6400mfp-941

WorkCentre 6400 Service Manual 3-145

Error Messages and Codes

Tray 1 Assembly Error

Tray 1 is missing or incorrectly installed.

Applicable Chain-Link Code

■ 377.314.00: Communication Error with Tray 1 Assembly

Initial Actions

■ Confirm the Tray 1 interface cable connector is correctly seated to the

main engine body and is free of damage.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Tray 1 Assy, PL5.12

■ Wire Harness Assy, PL15.21
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the Tray 1 interface connector Go to step 2. Replace the

(CN15) have continuity between pin 4 Tray 1
and pin 5? Assembly
(page 8-53).
2 With Tray 1 properly installed, Replace the Replace the
disconnect the MCU Board connector MCU Board Wire Harness
(PJ28MCU). (page 8-101). Assembly,
Does it have continuity between pin 4 PL 15.21.
and pin 5?

3-146 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board
(MCU)
+5VDC

P/J28 CN15 P/J5

+5VDC
1 1 3 PS7
GND
2 2 2 Tray 1 Paper
3 PS7_ON 3
PS7_SET
1 Empty Sensor
4 4
GND
5 5

s6400mfp-942

WorkCentre 6400 Service Manual 3-147

Error Messages and Codes

Xerographic System Error

The printer has reported a CRUM ASIC Communication Failure. One or more
of the Imaging Unit CRUMS cannot communicate with the IOT.

Applicable Chain-Link Code

■ 391.313.00: CRUM ASIC Comm Fail

Initial Actions

■ Remove each Imaging Unit and check for correct installation and physical
damage.

■ Ensure the Imaging Units are genuine Xerox supplies.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Toner Low Sensor Board (TLSB), PL6.18

■ Imaging Unit, PL6.23-26
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Inspect the affected color Toner Low Repair or replace Go to step 2.

Sensor (TLSB) CRUM Reader Board the Toner Low
contacts (set of copper contacts at Sensor Board
the front of the cavity). (TLSB)
Is there damage noted? (page 8-79).
2 Replace the affected Imaging Unit Go to step 3. Troubleshooting
(page 8-17). complete.
Does the error still occur?
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ13MCU) properly connected? connector.
4 Replace the Toner Low Sensor Board Replace the MCU Troubleshooting
(TLSB) (page 8-79). Board complete.
Does the error still occur? (page 8-101).

3-148 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine P/J13 P/J2

CSIC_RXD *2
Control 11 1 Toner Low
CSIC_TXD *1
Board 10 2 Sensor Board
GND
9 3
(MCU) (TLSB)
K
P/J1
8 1
C
7 2
M
6 3
Y
5 4
LED
4 5
+5VDC NC
3 6
NC
2 7
+5VDC
1 8
s6400mfp-553

WorkCentre 6400 Service Manual 3-149

Error Messages and Codes

Xerographic System Error

There is a problem with the Xerographic System. The Charge Corona wire
within one of the Imaging Units has failed.

Applicable Chain-Link Code

■ 391.320.00: CC Wire Cut Fail

Initial Actions

■ Remove each Imaging Unit and check for toner build up or physical
damage to the Charge Corona wire (see illustration), replace as
necessary.

■ Reinstall the Imaging Units and power cycle the printer.

■ If the problem persists, follow the procedure below.

Charge Corona

s6400mfp-117

3-150 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Imaging Unit, PL6.23-26

■ Wire Harness (Charge Voltage 1-4),
PL7.10, PL7.13-15
■ HVPS-2, PL20.21

Warning
Make sure the power to the printer is turned Off and the power cord is
unplugged prior to following the troubleshooting procedures below.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the Charge Corona voltage contact Go to step 2. Clean or correct

or Photoconductor Ground contact at the appropriate
the end of the affected Imaging Unit contact.
clean and connected properly?
2 Replace the affected Imaging Unit. Go to step 3. Troubleshooting
Does the error still occur? complete
3 Check the Charge Voltage wiring Replace the Reseat the
harnesses between the affected HVPS -2 affected 2iring
Imaging Unit and HVPS2. (page 8-109). harness.
Are the harnesses seated corrected?

HVPS-2

G4
Grid Voltage Y (White wire/Yellow connector)
C4
P.C. Drum Ch. (Red wire/Yellow connector)
G3 Corona Y *5
Grid Voltage M (White wire/Red connector)
C3
P.C. Drum Ch. (Red wire/Red connector)
G2 Corona M *5
Grid Voltage C (White wire/Blue connector)
C2
P.C. Drum Ch. (Red wire/Blue connector)
G1 Corona C *5
Grid Voltage K (White wire/White connector)
C1
P.C. Drum Ch. (Red wire/White connector)
T2 Corona K *5
2nd Image Transfer (White wire/Red connector)
T1
1st Image Transfer (White wire/White connector)
s6400mfp-943

WorkCentre 6400 Service Manual 3-151

Error Messages and Codes

Status Messages

Cyan, Magenta, Yellow, or Black Toner Cartridge is Missing or not Seated

Properly

The printer has reported that the Cyan, Magenta, Yellow or Black Toner
Cartridge is missing from the printer or not installed correctly. The CRUM
Reader Board does not detect the presence of a Toner Cartridge.

Applicable Status Messages

■ Black Toner Cartridge is missing or not seated properly

■ Cyan Toner Cartridge is missing or not seated properly

■ Magenta Toner Cartridge is missing or not seated properly

■ Yellow Toner Cartridge is missing or not seated properly

■ Metered Black Toner Cartridge is missing or not seated properly

■ Metered Cyan Toner Cartridge is missing or not seated properly

■ Metered Magenta Toner Cartridge is missing or not seated properly

■ Metered Yellow Toner Cartridge is missing or not seated properly

Initial Actions

■ Confirm the Toner Cartridge is properly installed and securely locked.

■ Remove and reinstall the affected Toner Cartridge.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ CRUM Reader Board, PL6.02

■ CMYK Toner Cartridge, PL6.19~22
■ MCU Board, PL20.09
■ Wire Harness, PL24.02

3-152 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Remove the affected color Toner Replace the Rail Go to step 2.
Cartridge and inspect the Rail for (PL6.16 or
damage or obstruction. PL6.17).
Is there damage noted?
2 Replace the affected Toner Cartridge Go to step 3. Troubleshooting
Does the error still occur? complete.
3 Inspect the affected color CRUM Repair or replace Go to step 4.
Reader Board (set of copper contacts the CRUM
at the rear of the cavity). Reader Board
Is there damage noted? (page 8-119).
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ29MCU) properly connected? connector.
5 Is there continuity between Replace the MCU Replace the
PJ29MCU and the affected colors PJ Board wiring harness.
(22, 23, 24, or 25)? (page 8-101).

Engine Control
Board
P/J29 P/J22
(MCU) GND
1 3
CSIC_TXD *1 Toner Bottle Y
2 2
CSIC_RXD *2
3 1

GND
P/J23
4 3
CSIC_TXD *1 Toner Bottle M
5 2
CSIC_RXD *2
6 1

GND
P/J24
7 3
CSIC_TXD *1 Toner Bottle C
8 2
CSIC_RXD *2
9 1

GND
P/J25
10 3
CSIC_TXD *1 Toner Bottle K
11 2
CSIC_RXD *2
12 1

s6400mfp-944

WorkCentre 6400 Service Manual 3-153

Error Messages and Codes

Finisher Main Tray is Full

The Finisher has reported that the Main Tray is full. The paper level in the
Main Tray is detected by the Paper Level Sensor/1 (PS9), Paper Level Sensor/
2 (PS10), and the Tray Lower Sensor (PS13). When the corresponding
Sensors detect either condition 1 or 2 as shown in the Sensor Logic Table
below, the printer determines the Finisher Main Tray is full.

Applicable Status Message

■ Finisher Main Tray is Full

Initial Actions

■ Remove the paper from the Finisher Main Tray.

■ Inspect the Main Tray for correct installation or damage.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Cover Assembly (includes PS9, PS10), PL36.01

■ Finisher Control Board (FSCB), PL46.16
■ Finisher Main Tray, (includes PS13), PL48.18

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Replace the Main Tray (page 8-216). Go to step 2. Troubleshooting

Does the error still occur? complete.
2 Replace the Cover Assembly Replace the Troubleshooting
(page 8-183). Finisher Control complete.
Does the error still occur? Board (FSCB)
(page 8-205).

Sensor Logic Table

Paper Level/1 Paper Level/2 Tray Lower

Condition Finisher State
Sensor PS9 Sensor PS10 Sensor PS13

1 Unblocked Blocked Blocked Main Tray is Full

2 Unblocked Unblocked Blocked

3-154 WorkCentre 6400 Service Manual

Error Messages and Codes

Finisher Control
Board (FSCB)
CN8 CN1 P/J7
+5VDC PS10_ON
6 1 1 PS10
GND
5
+5VDC
2 2 Paper Level
4 3 3 Sensor 2
P/J6
PS9_ON
3 4 1 PS9
GND
2
+5VDC
5 2 Paper Level
1 6 3 Sensor 1
s6400mfp-560

WorkCentre 6400 Service Manual 3-155

Error Messages and Codes

Finisher Top Tray is Full

The Finisher has reported that Top Tray is full. After all the paper has exited to
the Sub Tray, the Finisher detects the Paper Full Sensor (PS4) is not blocked.

Applicable Status Message

■ Finisher Top Tray is Full.

Initial Actions

■ Empty the Finisher Top Tray.

■ Inspect the Tray for proper installation or damage.

■ Verify the Lever (Actuator) up/ down movement.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Paper Full Sensor (PS4), PL39.14 012-304

■ Paper Full Sensor Lever (Actuator), PL39.20
■ Finisher Control Board (FSCB), PL46.16

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Completely remove the Finisher Top Go to step 2. Reinstall or

Tray from the printer and inspect the replace the
Lever. Lever.
Does the Lever move freely (Up/
Down)?
2 Test the Finisher Top Tray Paper Full Go to step 3. Go to step 4.
Sensor in Diagnostics.
Use the Lever to change the state of
the sensor
Does the sensor state change?
3 Reinstall the Finisher Top Tray Go to step 4. Troubleshooting
(page 8-191). complete.
Does the error still occur?
4 Is the Finisher Control Board (FSCB) Go to step 5. Properly seat the
connector (CN7FSCB) properly connector.
connected?

3-156 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Replace the Paper Full Sensor, Replace the Troubleshooting
PL39.14. Finisher Control complete.
Does the error still occur? (FSCB) Board
(page 8-205).

Finisher Control
Board (FSCB)
CN7
5 NC
4 NC P/J8
+5VDC PS4_ON
3 1 PS4
GND
2
+5VDC
2 Paper Full
1 3 Sensor
s6400mfp-945

WorkCentre 6400 Service Manual 3-157

Error Messages and Codes

Fuser is Missing or Not Installed Correctly

The printer has reported the Fuser is missing or not installed correctly. The
FU_Unit_Detect signal on PJ4MCU pin 9 indicates the Fuser is not installed.

Applicable Status Message

■ Fuser is Missing or Not Installed Correctly.

Initial Actions

■ Check the Fuser is correctly installed in the printer.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Wire Harness Assy, PL10.07

■ Fuser Unit, PL18.01
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Remove and reinstall the Fuser Go to step 2. Troubleshooting

making sure the left and right amber complete.
gold screws are securely tightened
against the brackets.
Power cycle the printer.
Does the error still occur?
2 Inspect the Fuser bulkhead connector Replace the Go to step 3.
for physical damage. connector
Is there damage noted? (included with
PL10.7).
3 Replace the Fuser Unit (page 8-24). Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ4MCU) properly connected? connector.
5 Is there continuity between PJ4MCU Replace the MCU Replace the
pin 9 and Fuser bulkhead connector Board wiring harness.
FSR1B pin 8? (page 8-101).

3-158 WorkCentre 6400 Service Manual

Error Messages and Codes

WorkCentre 6400 Service Manual 3-159

Error Messages and Codes

Install or Reseat Imaging Unit

The printer has reported that the Black, Cyan, Magenta or Yellow Imaging Unit
is missing from the printer or not installed correctly. The Imaging Unit
detection circuitry consists of a CRUM within each Imaging Unit that
communicates with the MCU Board via the Toner Low Sensor Board (TLSB).

Applicable Status Messages

■ Black Imaging is missing or not installed properly.

■ Cyan Imaging is missing or not installed properly.

■ Magenta Imaging is missing or not installed properly.

■ Yellow Imaging is missing or not installed properly.

Initial Actions

■ Confirm the Imaging Unit is securely locked in place.

■ Remove and reinstall the affected Imaging Unit.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Toner Low Sensor Board (TLSB), PL6.18

■ Imaging Unit, PL6.23-26
■ Imaging Unit (K) Rail, PL9.06
■ Imaging Unit (Y, M, C) Rail, PL9.07
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Remove the affected colors Imaging Replace the Rail Go to step 2.

Unit and inspect the Rail for damage (page 8-126,
or obstruction. steps 1-9)
Is there damage noted? (PL9.06 or
PL9.07).
2 Replace the affected Imaging Unit Go to step 3. Troubleshooting
(page 8-17). complete.
Does the error still occur?

3-160 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Inspect the affected color Toner Low Repair or replace Go to step 4.
Sensor (TLSB) CRUM Reader Board the Toner Low
Contacts (set of copper Contacts at Sensor Board
the front of the cavity). (TLSB)
Is there damage noted? (page 8-79).
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ13MCU) properly connected? connector.
5 Replace the Toner Low Sensor Board Replace the MCU Troubleshooting
(TLSB) (page 8-79). Board complete.
Does the error still occur? (page 8-101).

Engine P/J13 P/J2

CSIC_RXD *2
Control 11 1 Toner Low
CSIC_TXD *1
Board 10 2 Sensor Board
GND
9 3
(MCU) (TLSB)
K
P/J1
8 1
C
7 2
M
6 3
Y
5 4
LED
4 5
+5VDC NC
3 6
NC
2 7
+5VDC
1 8
s6400mfp-553

WorkCentre 6400 Service Manual 3-161

Error Messages and Codes

Non-Xerox Imaging Unit in Use

The printer has reported that the Cyan, Magenta, Yellow or Black Imaging Unit
is not a genuine Xerox Supply item. Image Quality may vary and cannot be
guaranteed. The Imaging Unit manufacturer's identification circuitry consists
of a CRUM within each Imaging Unit that communicates data through the
Toner Low Sensor Board (TLSB) and ultimately the MCU Board.

Applicable Status Messages

■ Non Xerox Black Imaging Unit in Use

■ Non Xerox Yellow Imaging Unit in Use

■ Non Xerox Cyan Imaging Unit in Use

■ Non Xerox Magenta Imaging Unit in Use

Initial Actions

■ Confirm the Imaging Unit is securely locked in place.

■ Remove the affected Imaging Unit and confirm it is genuine Xerox.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Toner Low Sensor Board (TLSB), PL6.18

■ Imaging Unit, PL6.23-26
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Replace the affected Imaging Unit Go to step 2. Troubleshooting

(page 8-17). complete.
Does the error still occur?
2 Inspect the affected color Toner Low Repair or replace Go to step 3.
Sensor (TLSB) CRUM Reader Board the Toner Low
Contacts (set of copper Contacts at Sensor Board
the front of the cavity). (TLSB)
Is there damage noted? (page 8-79).
3 Is the MCU Board connector Go to step 4. Properly seat the
(PJ13MCU) properly connected? connector.

3-162 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Replace the Toner Low Sensor Board Replace the MCU Troubleshooting
(TLSB) (page 8-79). Board complete.
Does the error still occur? (page 8-101).

Engine P/J13 P/J2

CSIC_RXD *2
Control 11 1 Toner Low
CSIC_TXD *1
Board 10 2 Sensor Board
GND
9 3
(MCU) (TLSB)
K
P/J1
8 1
C
7 2
M
6 3
Y
5 4
LED
4 5
+5VDC NC
3 6
NC
2 7
+5VDC
1 8
s6400mfp-553

WorkCentre 6400 Service Manual 3-163

Error Messages and Codes

Output Tray is Full (No Finisher)

The printer has reported that the Output Tray is full. The Paper Full Sensor
PS14 is blocked indicating paper in the Output Tray has pushed the Actuator
(PL19.70) upward.

Applicable Status Message

■ Output Tray is Full.

Initial Actions

■ Remove all paper from the Output Tray.

■ Inspect the Output Tray for correct installation or damage.

■ Check the Paper Full Sensor Actuator (PL19.07) for proper operation or
damage.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Paper Full Sensor Actuator, PL19.07

■ Paper Full Sensor, PL19.13 010-212
■ Exit Assembly, PL19.25
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Inspect the Paper Full Sensor Go to step 2. Reinstall or

Actuator. replace the
Is the Actuator securely in place and Actuator
undamaged? (PL19.07).
2 Test the Paper Full Sensor in Go to step 3. Replace the
Diagnostics. Paper Full
Use the Actuator to change the Sensor
Sensors state. (PL19.13).
Does the Sensor state change?
3 Check the Exit Assembly Harness Go to step 4. Reseat the Exit
connection to connector CN_Exit. Assembly
Is the Harness firmly seated? Harness.
4 Replace the Paper Full Sensor Replace the MCU Troubleshooting
(PL19.13). Board complete.
Does the error still occur? (page 8-101).

3-164 WorkCentre 6400 Service Manual

Error Messages and Codes

Engine Control
Board (MCU)
+5VDC
P/J36 CN_EXIT CN_EXIT1
+5VDC
1 6 3 PS15
GND
2 5 2 Exit
PS15_ON
3 4 1 Sensor 2
CN_EXIT2
+5VDC
4 3 3 PS14
GND
5 2 2 Paper Full
PS14_ON
6 1 1 Sensor
s6400mfp-929

WorkCentre 6400 Service Manual 3-165

Error Messages and Codes

Tray 2 is Empty - Add Paper

The printer detects Tray 2 is empty and needs paper. The "Tray 2 is Empty
Message" is displayed when the Tray 2 Paper Empty Sensor (PS8) is
unblocked by the Sensor Actuator.

Applicable Status Message

■ Tray 2 is Empty - Add paper.

Initial Actions

■ Remove any paper from Tray 2.

■ Inspect the Paper Tray for damage and verify correct Lift Plate operation.

■ Reload Tray 2 with fresh paper and confirm the Paper Guides are set
correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Tray 2 Paper Empty Sensor, PL9.04 072-201

■ Tray 2 Paper Empty Sensor Actuator, PL9.05
■ Tray 2 Paper Tray, PL21.28
■ Wire Harness Assy, PL24.07
■ MCU Board, PL20.09

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Completely remove Tray 2 from the Go to step 2. Reinstall or

printer and inspect the Paper Empty replace the Tray
Sensor Actuator. 2 Paper Empty
Is the Actuator securely in place and Sensor Actuator
undamaged? (page 8-57).
2 Test the Tray 2 Paper Empty Sensor Go to step 3. Go to step 4.
in Diagnostics.
Use the Actuator to change the state
of the Sensor.
Does the Sensor state change?
3 Reinstall Tray 2. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ26MCU) properly connected? connector.

3-166 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Replace the Tray 2 Paper Empty Go to step 6. Troubleshooting
Sensor (page 8-56). complete.
Does the error still occur?
6 Is there continuity between Replace the MCU Replace the
PJ26MCU and PJ19 (PS8)? Board wiring harness.
(page 8-101).

Engine Control
Board (MCU)
P/J26 P/J19
+5VDC PS8_ON PS8
6 1
GND
5 2 Paper Empty
+5VDC
4 3 Sensor
P/J18
PS6_LED
3 1 PS6
+5VDC
2
PS6_ON
2 Waste Toner
1 3 Sensor
s6400mfp-946

WorkCentre 6400 Service Manual 3-167

Error Messages and Codes

Tray 2 is Open

The printer has reported that Tray 2 is open. The "Tray 2 is Open Message" is
triggered when the Tray 2 Paper Size Switch (SW5) logic indicates all 3
Switches within SW5 are Off (refer to the logic table).

Applicable Status Messages

■ Dedicated Tray 2 is open.

■ Adjustable Tray is open.

Initial Actions

■ Remove Tray 2 from the printer and inspect the Tray 2 Size Switch
Actuator (PL7.12) for correct installation or physical damage.

■ Inspect the rear of the Paper Tray for damage.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Tray 2 Paper Size Switch (SW5), PL7.11 072-204, 072-205, 072-206

■ Tray 2 Paper Size Switch Actuator, PL7.12
■ MCU Board, PL20.09
■ Tray 2, PL21.28
■ Wire Harness Assy, PL 24.03

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Completely remove Tray 2 from the Go to step 2. Reinstall or

printer and inspect the Paper Size replace the Tray
Switch Actuator. 2 Paper Size
Is the Actuator securely in place and Switch Actuator
undamaged? (page 8-55).
2 Test the Tray 2 Paper Size Switch Go to step 3. Go to step 4.
(three switches within SW5) in
Diagnostics.
Use the Actuator to change the state
of each Switch.
Does the Sensor state of each Switch
change?
3 Reinstall Tray 2. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Is the MCU Board connector Go to step 5. Properly seat the
(PJ5MCU) properly connected? connector.

3-168 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Replace the Tray 2 Paper Size Switch Go to step 6. Troubleshooting
(page 8-54). complete.
Does the error still occur?
6 Is there continuity between PJ5MCU Replace the MCU Replace the
and PJ33 (SW5)? Board wiring harness.
(page 8-101).

Engine Control
Board P/J5 P/J33
(MCU) 4
SIZE2 1
GND SW5
3 2
SIZE1 Tray 2 Paper Size
2 3
1
SIZE0
4 Switch
s6400mfp-544

SW5 Switch Logic Table

Tray 2 Paper Size Switch Paper Size

SW1 SW2 SW3

ON OFF OFF A4
OFF ON OFF Letter
ON OFF ON Executive
ON ON OFF B5
OFF ON ON Postcards
ON ON ON Non-standard size
OFF OFF OFF Tray open

WorkCentre 6400 Service Manual 3-169

Error Messages and Codes

Tray 3 or 4 is Empty - Add Paper

The printer has detected that Tray 3 or Tray 4 is empty and needs paper. The
"Tray 3 or 4 is Empty Message" is displayed when the Paper Empty Sensor
(PS22) is unblocked by the Sensor Actuator.

Applicable Status Messages

■ Tray 3 is Empty - Add paper.

■ Tray 4 is Empty - Add paper.

Initial Actions

■ Remove any paper from the affected Tray.

■ Inspect the Paper Tray for damage and verify correct Lift Plate operation.

■ Reload the affected Tray with fresh paper and confirm the Paper Guides
are set correctly.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LTA Control Board (PCCB), PL28.11

■ Tray 3/ 4 Paper Empty Sensor (PS22), PL29.11 073-201, 074-201
■ Tray 3/ 4 Paper Empty Sensor Actuator, PL29.20
■ Tray 3/4 Paper Tray, PL34.24

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Completely remove the affected Tray Go to step 2. Reinstall or

from the printer and inspect the replace the
Paper Empty Sensor Actuator. Actuator.
Is the Actuator securely in place and
undamaged?
2 Test the Tray 3 or 4 Paper Empty Go to step 3. Go to step 4.
Sensor. Use the Actuator to change
the state of the Sensor.
Does the Sensor state change?
3 Reinstall the affected Tray. Go to step 4. Troubleshooting
Does the error still occur? complete.
4 Replace the Tray 3 or 4 Paper Empty Go to step 5. Troubleshooting
Sensor (PS22). complete.
Does the error still occur?

3-170 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the PCC Board connector Go to step 6. Properly seat the
(PJ5PCCB) properly connected? connector.
6 Is there continuity between PJ5PCCB Replace the PCC Replace the
and PJ30 (PS22)? Board wiring harness.
(page 8-161).

WorkCentre 6400 Service Manual 3-171

Error Messages and Codes

Tray 3 or Tray 4 is Open

The printer has detected that Tray 3 or Tray 4 is open. The "Tray 3 is Open”
message or the "Tray 4 is Open” message is triggered when the Tray 3 or 4
Paper Size Switch (MS1) logic indicates all 3 switches within MS1 are Off
(refer to the “MS1 Logic Table” on page 3-173).

Applicable Status Messages

■ Dedicated Tray 3 is open.

■ Adjustable Tray 3 is open.

■ Dedicated Tray 4 is open.

■ Adjustable Tray 4 is open.

Initial Actions

■ Remove the affected Tray from the printer and inspect the Size Switch
Actuator (PL28.12) for correct installation or physical damage.

■ Inspect the rear of the affected Paper Tray for damage.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ LTA Control Board (PCCB), PL28.11

■ Tray 3/ 4 Paper Size Switch Actuator, PL28.12
■ Tray 3/4 Paper Size Switch (MS1), PL28.14 073-204~206, 074-204~206
■ Tray 3/4 Paper Tray, PL31.24

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Completely remove the affected Tray Go to step 2. Reinstall or

from the printer and inspect the replace the Tray
Paper Size Switch Actuator. 3/4 Paper Size
Is the Actuator securely in place and Switch Actuator
undamaged? (page 8-163).
2 Test the affected Tray Paper Size Go to step 3. Go to step 4.
Switch (three Switches within MS1).
Use the Actuator to change the state
of each Switch.
Does the Sensor state of each Switch
change?
3 Reinstall the affected Tray. Go to step 4. Troubleshooting
Does the error still occur? complete.

3-172 WorkCentre 6400 Service Manual

Error Messages and Codes

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the PCC Board connector Go to step 5. Properly seat the
(PJ4PCCB) properly connected? connector.
5 Replace the Tray 3/4 Paper Size Go to step 6. Troubleshooting
Switch (page 8-165). complete.
Does the error still occur?
6 Is there continuity between PJ4PCCB Replace the PCC Replace the
and PJ27 (MS1)? Board wiring harness.
(page 8-161).

Feeder Board
(PCCB) P/J4 P/J27
SIZE1 4
1
2
SIZE2 3 SW6
SIZE4 Paper Size
3 2
SIZE3
4 1 Switch
s6400mfp-947

MS1 Logic Table

Tray 3/4 Paper Size Switch Paper Size

SW1 SW2 SW3

OFF ON ON Legal
ON ON ON Government Legal/Letter Plus
ON OFF OFF Letter
ON ON OFF A4
OFF OFF ON B5
ON OFF ON Executive
OFF OFF OFF Tray open

WorkCentre 6400 Service Manual 3-173

Error Messages and Codes

3-174 WorkCentre 6400 Service Manual

General Troubleshooting
In this chapter...
■ Introduction
■ System Startup
■ Power On Self Test (POST)
■ Service Diagnostics
■ Service Diagnostics Menu Map
■ Printer Components
■ Duplex Unit Components
■ Optional 500-Sheet Feeder Components
■ Finisher Components
■ Service Diagnostics Tests
■ Service Diagnostics Tests
■ General Troubleshooting
■ Control Panel Troubleshooting
■ Inoperable Printer Troubleshooting
■ AC Power Supply Troubleshooting
■ DC Power Supply Troubleshooting
■ Image Processor Board Troubleshooting
■ DADF Troubleshooting
■ Scanner Troubleshooting
■ Fax Troubleshooting
■ Operating System and Application Problems

Chapter
4
General Troubleshooting

Introduction

This chapter covers the System Startup, Power On Self Test (POST), Service
Diagnostics, and troubleshooting problems that are not associated with a fault
code or Control Panel error message.
For troubleshooting problems associated with a fault code or Control Panel
error message, refer to “Error Messages and Codes” on page 3-1. Print-
quality problems are covered in “Print-Quality Troubleshooting” on page 5-1.
The Appendix contains a complete list of Fault Codes and Status Messages.

System Startup

When the printer is turned On, the system power state is indicated by an LED
on the UI.
At power-on, the Copy Controller (CC), Network Controller (NC), and Image
Output Terminal (IOT) receive power and perform a Power-On Self Test
(POST) of the minimal essential hardware components to enable the
operating systems to load and boot into a minimal-power safe state.
The NC and CC’s operating system start the application that manages the
creation and initialization of the system’s software services,
1. When the power switch is turned On, 3.3 V power is applied to the printer.
The CC and NC perform basic hardware initialization activities. Various
activities occur at power-on including:
■ A static Power-on Splash Screen is displayed.
■ The user pathways is displayed.
■ The CC performs its boot initialization activities including hardware
initialization tasks such as CPU, FPGA, System RAM, loading the U-
boot software and running the Power-On Self Test (POST).
■ The NC performs its boot initialization activities including hardware
initialization tasks such as CPU, FPGA, System RAM, and disk
controller initialization.
■ The CC and NC boot separately and synchronize with each other
when both are ready.
2. Once the CC has successfully communicated with the IOT, the IIT
receives 24 V to power the lamp and motors.
3. The CC communicates to the IIT. The Scanner reports whether the
Duplex Auto Document Feeder (DADF) is present.
4. The NC load its operating system and attempt to synchronize with the CC
when it has finished booting within 5 minutes.
5. The NC communicates to the UI which sets the back light brightness and
turns the LED’s On or Off.
6. The CC detects the presence or absence of fax.
7. The User Interface (UI) synchronizes with the CC after the NC has
finished loading its application software.

4-2 WorkCentre 6400 Service Manual

General Troubleshooting

8. After communication has been established between the core modules

(CC, NC, IOT, and IIT), the CC determines the printer’s configuration and
capabilities and detects the following components:
■ Finisher
■ Foreign Interface Device (FID)
9. The printer performs some initialization if this is the first time the printer
has ever been powered On.
10. The LED on the Control Panel is lit indicating the printer is powering On.
11. The printer displays a static splash screen when the initialization is
completed.

WorkCentre 6400 Service Manual 4-3

General Troubleshooting

Power On Self Test (POST)

POST Diagnostics provide a quick means of isolating a defective subsystem

associated with the Image Processor Board and SDRAM. There are two
methods available to view Post Test results: Use the local UI LED’s or the
POST LED’s on the Image Processor (I/P) Board.

Sequence

The Copy Controller (CC) and Network Controller (NC) have separate and
independent UBOOT code; both boot independently from one another and
simultaneously. POST NC occurs on the network controller and POST CC
occurs on the copy controller side of the I/P Board.

NC POST

1. When power is turned On, both NC and CC Health LED’s on the I/P Board
are turned On, which indicates power is initiated.
2. The UART for debug serial port is initialized.
3. The NC SDRAM DIMM is tested, which included Data Line, Address Line,
Byte Lane via walking 1’s. If an error is detected, the boot process halts
and the error is indicated by a blink code on the NC Health LED.
An attempt will be made to write more detailed information to the serial
debug port (which should work as the RAM is not being used at this point
and the debug serial port has been initialized).
4. The CPU loads its single FPGA. If an error is detected during this step,
the system attempts to continue with the Uboot process to allow for
recovery and an error is indicated by a blink code on the NC Health LED.
5. The Controller Board health is checked. If there is a failure on the board,
the NC Health LED blinks.
6. Software checks the Disk Drive. If the Disk Drive is not accessible or
cannot be communicated to, the NC Health LED blinks.
7. The Operating System (OS) is loaded from Hard Drive and the OS is
brought up.

CC POST

1. CC SDRAM DIMM is tested, which included Data Line, Address Line,

Byte Lane via walking 1’s. If an error is detected, the boot process halts
and the error is indicated by a blink code on the CC Health LED. An
attempt will be made to write more detailed information to the debug serial
port.
2. The CPU loads its single FPGA. If an error is detected during this step,
the system attempts to continue with the Uboot process to allow for
recovery and an error is indicated by a blink code on the CC Health LED.
3. The Controller Board health is checked. If there is a failure on the board,
the CC Health LED blinks.
4. The Operating System is loaded from the HDD, although bootstrap code
loaded from ROM.

4-4 WorkCentre 6400 Service Manual

General Troubleshooting

POST LED’s

Two LED’s are available on the WorkCentre 6400 I/P Controller Board. The
LED’s are used to report status and errors if early failures are detected and
there is there is not enough functionality to report status with the LUI LED’s
and display.

■ Network Controller (NC) Health

■ Copy Controller (CC) Health

LED Blink Patterns

All POST errors blink the LED’s a certain number of time at 2 Hz, pause or 2
seconds, and then repeat. There is no single blink error code. The blink
patterns between the NC and CC Health LED’s are the same. All errors blink
the LED’s a certain number of times at 2 Hz, pause for 2 seconds, and then
repeat. There is no single blink error code.
In addition, the UI panel LED’s will blink, if possible. These LED’s blink in
addition to the on-board LED’s.

■ Top left UI LED blinks (Feature button): Indicates NC errors

■ Middle left LED blinks (Job Status button): Indicates CC errors

NC Blink Patterns

Number of Time Error Replacement Part PL

2 NC RAM DIMM Error NC RAM DIMM 20.44

3 NC FPGA Error I/P Board 20.07
4 EEPROM Error I/P Board 20.07
5 Disk Failure NC Hard Drive 20.03
6 UI Failure Control Panel 2.12
7 Disk Controller Error I/P Board 20.07

CC Blink Patterns

Number of Time Error Replacement PL

2 CC RAM DIMM Error CC RAM DIMM 20.44

3 CC FPGA Error I/P Board 20.07
4 CC Poseidon ASIC Error I/P Board 20.07
5 CC Galileo ASIC Error I/P Board 20.07
6 CC - NC Error I/P Board 20.07
7 CC - NVRAM Error NVM Module 20.43

WorkCentre 6400 Service Manual 4-5

General Troubleshooting

I/P Board LED

NC Power On Self Test All Power OK

NC HD Active 3.3V Power

Ethernet
Active LED

Copy Controller Power On Self Test CC HD Active

s6400mfp-860

Errors

Hard faults prevent the boot sequence from continuing; the boot sequence
aborts with no further tests attempted. When a hard fault occurs, the error
code will be flashed on the local UI LED’s and the NC and CC POST LED’s on
the Image Processor Board.

4-6 WorkCentre 6400 Service Manual

General Troubleshooting

Service Diagnostics

The WorkCentre 6400 has built-in diagnostics that allow access to Sensors,
Clutches, Solenoids, printer status, turning the motors On and Off, and some
NVRAM access. Using these tests, service technicians should be able to
diagnose the problems quickly and isolate which component or sub assembly
part needs replacement.
If confronted with an error that requires more than a cursory investigation to
clear or when directed by a troubleshooting procedure, use Service
Diagnostics to exercise selected sub-assemblies or parts in the vicinity of the
reported error. Diagnostic tests are controlled from the Control Panel.

Entering Service Diagnostics

1. Press and hold the [*] then + [#] then + [Stop] buttons.
2. On the Login screen on the Control Panel, enter 6789.
3. Touch the Enter button.
4. The Service Info tab is displayed as the default screen upon entering
Service Diagnostics.

Using Service Diagnostics

Most of the diagnostic tests are straightforward and require no additional

explanation, but there are some that require specific conditions be met to
achieve meaningful results. These instructions cover each of the test groups,
listing special instructions, conditions, or other information necessary to
successfully interpret the results of the diagnostic tests.

WorkCentre 6400 Service Manual 4-7

General Troubleshooting

Service Diagnostics Menu Map

Menu Map (page 1 of 2)

Tabs
Log In/Out Help

Services Home
To access the Service Diagnostics Menu:
ABC DEF
1 2 3 Clear All 1. Press and hold the *, then + #,
Features
GHI
4
JKL
5
MNO
6 Interrupt
* then + Stop buttons to get to the
PRS TUV WXY Printing

Job Status
7
Dial Pause
8 9
# Login Screen
0 # Stop

Machine Status
* 2. Enter 6789 and touch the Enter button
// C Start
Language

Stop

Black Toner Cartridge

Cyan Toner Cartridge
Magenta Toner Cartridge
Service Info Yellow Toner Cartridge
dc104 Usage Counters Black Print Cartridge
dc108 Software Version Cyan Print Cartridge
dc120 Fault Counters Magenta Print Cartridge
Yellow Print Cartridge
dc122 Fault History
Fuser Cartridge
dc135 CRU/HFSI Waste Container Fuser Thermistor 1
Transfer Belt Fuser Thermistor 2
Transfer Roller Humidity Sensor
Temperature Sensor
Diagnostics ROS Unit Sensor
dc140 Analog Monitor
dc312 Network Echo Test
dc330 Component Control A
dc575 Scanner Test ~90 Secs DRAM
dc612 Print Test Pattern <5 Secs Home Position
dc640 Video Path Integrity <5 Secs Lock Check Black Toner Cartridge
~15 Secs Optical Cyan Toner Cartridge
Magenta Toner Cartridge
Cyan 50% Fill Yellow Toner Cartridge
Magenta 50% Fill Black Print Cartridge
Yellow 50% Fill Cyan Print Cartridge
Adjustments Black 50% Fill Magenta Print Cartridge
dc130 Image Position Registration Print Yellow Print Cartridge
Delta-E Print Maintenance Fuser Cartridge
dc131 NVM Read/Write
Waste Container
dc301 NVM Initialization Ghosting Print dc103 Billing Plan
Transfer Belt
dc361 NVM Save and dc120 Fault Counters Transfer Roller
Restore Copier dc122 Fault History
dc608 Document Feeder Fax
Registration dc135 CRU/HFSI Status
User and Reset
dc609 Document Glass System
dc137 PagePack Disabled
Registration All
Enabled
dc909 Calibrate for
Paper Type
dc936 Image Quality Call Closeout
Calibration
Reset Counters
dc960 Altitude Adjustment Standard Altitude
High Altitude Exit Only
Exit and Reboot
s6400mfp-754

4-8 WorkCentre 6400 Service Manual

General Troubleshooting

Menu Map (page 2 of 2)

A 005.011 DADF Simplex Motor 012.311 Finisher Aligning Belt Sensor

005.012 DADF De-Skew Clutch 012.312 Finisher Tray Upper Sensor
005.040 DADF Duplex Motor 012.313 Finisher Tray Lower Sensor
005.055 Pick-Up Roller Clutch 042.019 Fuser Cooling Fan Mid Speed
005.062 DADF Feed Clutch 042.020 Fuser Cooling Fan High Speed
005.100 DADF Duplex Solenoid 042.043 Ozone Fan
005.103 DADF Paper In Sensor 042.051 LVPS Cooling Fan High Speed
005.104 DADF Paper Out Sensor 042.052 Cooling Fan High Speed
005.105 DADF Paper Detect Sensor 042.053 Cooling Fan Mid Speed
005.106 DADF Cover Open Sensor 061.001 Laser Unit Motor
005.107 DADF Roller Sensor 062.007 Scanner Motor Test
005.108 DADF Jam Detect Sensor 071.003 Tray 1 Paper Feed Clutch
005.111 FB Home Position Sensor 071.201 Tray 1 Paper Empty Sensor
005.112 FB Cover Open Sensor 072.003 Tray 2 Paper Feed Clutch
005.113 ADF Motor Test 600x300 Color 072.201 Tray 2 Paper Empty Sensor
005.114 ADF Motor Test 600x600 Color 072.204 Tray 2 Paper Size Switch 1
005.115 ADF Motor Test 600x300 Mono 072.205 Tray 2 Paper Size Switch 2
005.116 ADF Motor Test 600x600 Mono 072.206 Tray 2 Paper Size Switch 3
005.227 DADH Media Outer Width Sensor 073.001 Tray 3 Feed Motor
005.228 DADH Media Inner Width Sensor 073.004 Tray 3 Paper Feed Clutch
005.229 DADH Media Legal Length Sensor 073.201 Tray 3 Paper Empty Sensor
010.005 Fuser Motor 073.202 Tray 3 Paper Feed Sensor
010.032 Registration Roller Clutch 073.203 Tray 3 Cover Open Sensor
010.204 Registration Roller Sensor 073.204 Tray 3 Paper Size Switch 1
010.205 Horizontal Transport Jam Sensor 073.205 Tray 3 Paper Size Switch 2
010.206 Paper Loop Sensor 073.206 Tray 3 Paper Size Switch 3
010.208 Fuser Exit Sensor 074.001 Tray 4 Feed Motor
010.212 Fuser Paper Full Sensor 074.004 Tray 4 Paper Feed Clutch
010.215 Fuser Paper Size Sensor 074.201 Tray 4 Paper Empty Sensor
012.003 Finisher Transport Motor 074.202 Tray 4 Paper Feed Sensor
012.004 Finisher Exit Motor 074.203 Tray 4 Right Cover Open Sensor
012.016 Finisher Media Eject Motor 074.204 Tray 4 Paper Size Switch 1
012.017 Finisher Align Motor 074.205 Tray 4 Paper Size Switch 2
012.018 Finisher Exit Roller Up/Down Motor 074.206 Tray 4 Paper Size Switch 3
012.057 Finisher Tray Up/Down Motor 077.018 Duplex Forward Motor
012.120 Finisher Fan 077.020 Duplex Reverse Motor
012.122 Finisher Entrance Solenoid 077.102 OHP Sensor
012.129 Staple Motor 077.109 Duplex Sensor
012.147 Finisher Media Level Lever Solenoid 077.301 Right Door Sensor
012.157 Finisher Align Belt Up/Down Solenoid 077.303 Front Door Sensor
012.158 Finisher Paddle Solenoid 077.305 Duplex Cover Sensor
012.283 Finisher Cover Sensor 077.309 Scanner Unit Open Sensor
012.284 Stapler Cover Switch 091.201 Waste Toner Full Sensor
012.285 Finisher Self-Priming Sensor 093.006 Toner Supply Motor Y
012.286 Staple Empty Sensor 093.007 Toner Supply Motor M
012.287 Staple Home Position Sensor 093.008 Toner Supply Motor C
012.301 Finisher Entrance Sensor 093.009 Toner Supply Motor K
012.302 Finisher Transport Section Sensor 093.023 Developing Motor K
012.304 Finisher Media Full Sensor 093.024 Developing Motor YMC
012.305 Finisher Media Ejector Sensor 093.082 Color UI Motor YMC
012.306 Finisher Aligning Plate Home Position Sensor 094.002 Pressure Retraction 1st Image Transfer Clutch
012.307 Finisher Storage Section Sensor 094.005 Pressure Retraction 2nd Image Transfer Clutch
012.308 Finisher Exit Roller Sensor 094.200 Retraction Position Sensor 1st Image
012.309 Finisher Media Level Sensor1 094.201 Retraction Position Sensor 2nd Image
012.310 Finisher Media Level Sensor2
s6400mfp-882

WorkCentre 6400 Service Manual 4-9

General Troubleshooting

Printer Components

Engine Motors and Clutches

1 2
3
4

16
15

6
12

11 7

10 8
9
s6400mfp-861

1. Tray 1 Paper Feed Clutch 1 (CL1) 9. Intermediate Transport Motor

(M1)
2. Tray 2 Feed Clutch 2 (CL3) 10. Developer Motor K (M5)

3. Fusing Fan Motor (FM12) 11. Ozone Motor Fan (Exhaust Fan)
(FM13)

4. Fusing Motor (M2) 12. Developer Motor Y/M/C (M4)

5. Registration Clutch (CL2) 13. Color PC Drum Motor (M3)

6. Pressure/Retraction Clutch 2 14. Toner Supply Motor Y/M (M6)

(CL5)

7. Pressure/Retraction Clutch 1 15. DC Power Supply Motor Fan

(CL4) (FM11)

8. Laser Unit 16. Toner Supply Motor C/K (M7)

4-10 WorkCentre 6400 Service Manual

General Troubleshooting

ADF Motors and Clutches

5 6
4
3

1 s6400mfp-948

1. Relay Board/1 4. Switchback Solenoid

2. Registration Clutch 5. DF Control Board

3. Transport Motor 6. Relay Board/2

ADF Sensors

4
1 2 3

8
7
6 5
s6400mfp-949

1. DADF Cover Open Sensor (PS1) 5. DADF Paper Detect Sensor (PS4)

2. DADF Roller Sensor (PS2) 6. DADF Jam Detect Sensor (PS5)

3. DADF Media Inner Width Sensor 7. DADF Paper In Sensor (IS01)
(SS1) & DADF Media Outer Width
Sensor (SS2)

4. DADF Media Length Sensor 8. DADF Paper Out Sensor (PS3)

(PS6)

WorkCentre 6400 Service Manual 4-11

General Troubleshooting

Engine Sensors and Switches

1
22 2 3
21
20 4

5
6

7
19
8
18 9

11
17

12
13

14
16 15 s6400mfp-862

1. Pressure Retraction Position 12. Paper Empty Sensor (PS8)

Sensor 2 (PS13)

2. Scanner Unit Open Sensor (PS15) 13. OHP Sensor (PS5)

3. Fusing Media Size Sensor (PS15) 14. Waste Toner Sensor (PS6)

4. Fuser Exit Sensor 15. Paper Empty Sensor 2 (PS8)

5. Paper Loop Sensor (PS10) 16. Power Switch (SW1)

6. IDC Sensor Board (Front) 17. Tray 2 Paper Size Switch (SW3)

7. Front Safety Switch (MS2) 18. Paper Full Sensor (PS14)

8. Right Door Sensor (PS3) 19. Exit Sensor (PS15)

9. Front Door Sensor (PS4) 20. Paper/ Retraction Position
Sensor 1 (PS12)

10. Right Sensor Switch (MS3) 21. Temperature/ Humidity Sensor

11. Registration Sensor (PS9) 22. IDC Sensor Board (Rear)

4-12 WorkCentre 6400 Service Manual

General Troubleshooting

Sensors (Paper Path)

5 6
2 3 4
7
8
9

11
12
s6400mfp-863

1. Storage Section Sensor (PS7)

2. Transport Section Sensor (P2)

3. Finisher Entrance Sensor (PS1)

4. Paper In Sensor (SS01)

5. DADF Detect Sensor (PS4)

6. Paper Out Sensor (PS3)

7. Fuser Exit Sensor (PS1)

8. Paper Feed Sensor (PS2)

9. Duplex Transport Sensor on Duplex Control Board (ADCB)

10. Registration Sensor (PS9)

11. Paper Loop Sensor (PS10)

12. Paper Feed Sensor (PS23) (Lower Feeder Unit)

WorkCentre 6400 Service Manual 4-13

General Troubleshooting

Duplex Unit Components

Duplex Unit Sensors and Motors

1
4
2

s6400mfp-864

1. Duplex Door Sensor (PS16)

2. Duplex Transport Motor (M8)

3. Duplex Control Board (ADCB)

4. Duplex Reverse Motor (M9)

4-14 WorkCentre 6400 Service Manual

General Troubleshooting

Optional 500-Sheet Feeder Components

Optional 500-Sheet Feeder Sensors, Switches, Clutch, Motor, and Board

7 1
6 2
3 4

s6400mfp-865

1. Right Door Switch (MS3)

2. Transport Motor (M16)

3. Paper Feed Sensor (PS23)

4. Paper Empty Sensor (PS22)

5. Paper Size Switch (SW6)

6. LTA Circuit Board (PCCB)

7. Paper Feed Clutch (CL6)

WorkCentre 6400 Service Manual 4-15

General Troubleshooting

Finisher Components

Finisher Sensors, Solenoids, Motors, and Switch

14 1
13 2
11 12
3
4
5

6
10

9
8
s6400mfp-866

1. Finisher Cover Sensor (PS3) 8. Align Motor (M2)

2. Entrance Solenoid (SD1) 9. Storage Section Sensor (PS7)

3. Paper Ejector Sensor (PS5) 10. Paper Ejector Motor (M1)

4. Transport Section Sensor (PS2) 11. Exit Roller Up/Down Motor (M5)

5. Entrance Sensor (PS1) 12. Aligning Plate Home Position

Sensor (PS6)

6. Staple Cover Switch (MS1) 13. Exit Roller Sensor (PS8)

7. Staple Unit 14. Paper Full Sensor (PS4)

4-16 WorkCentre 6400 Service Manual

General Troubleshooting

Finisher Sensors, Solenoids, Motors, and Board

1
10
2
9

5
4 3
s6400mfp-867

1. Aligning Belt Sensor (PS11) 6. Finisher Control Board

(FSCB)

2. Aligning Belt Up/Down Solenoid (SD3) 7. Paddle Solenoid (SD4)

3. Paper Level Lever Solenoid (SD2) 8. Exit Motor (M4)

4. Paper Level Sensor 2 (PS10) 9. Motor Fan (FM1)

5. Paper Level Sensor 1 (PS9) 10. Transport Motor (M3)

WorkCentre 6400 Service Manual 4-17

General Troubleshooting

Finisher Tray Sensors and Motor

3 2
s6400mfp-868

1. Tray Up/Down Motor (M6)

2. Tray Upper Sensor (PS12)

3. Tray Lower Sensor (PS13)

Finisher Paper Path Sensors

1
2

3
s6400mfp-869

1. Transport Section Sensor (PS2)

2. Entrance Sensor (PS1)

3. Storage Section Sensor (PS7)

4-18 WorkCentre 6400 Service Manual

General Troubleshooting

Service Diagnostics Tests

Service Diagnostic Routines

The Services Diagnostics menu contains five tabs, which provides users
access to individual diagnostic routines.

Service Diagnostic Routine Table

Test Control Panel Display Test Description

Service Info Provides specific information required during the servicing of the
system.
dc104 Usage ■ Total Impressions Provides usage information of the
Counters ■ Black Impressions printer.
■ Black Copied
Impressions
■ Black Printed
Impressions
■ Color Impressions

■ Color Copied
Impressions
■ Color Printed
Impressions
■ Stored Image Printed
Impressions
■ Black Stored Image
Printed
Impressions
■ Color Stored Image
Printed
Impressions
■ Embedded Fax
Impressions
■ Server Fax
Impressions
■ Internet Fax
Impressions
dc108 Software ■ Software Upgrade Provides software information
Version ■ Copy Controller including:
■ Copy Controller OS ■ System Software Version
■ Fax ■ Software Module Name
■ Imaging Output
Terminal
■ Network Controller
■ Image Input Terminal
■ Finisher
■ User Interface

WorkCentre 6400 Service Manual 4-19

General Troubleshooting

Service Diagnostic Routine Table (continued)

Test Control Panel Display Test Description

dc120 Fault ■ Sort on Occurrences Provides Fault information including:
Counters ■ Include Zero ■ Chain Link
Occurrences ■ Description
■ Chain ■ Occurrences
■ Find
■ Chain Link
■ Description
■ Occurrences
dc122 Fault ■ Chain Link Provides the most recent (last 40)
History ■ Description Faults including:
■ Date & Time ■ Chain Link

■ Description

■ Last Occurrence

dc135 CRU/ ■ Type Provides read access to each CRU/

HFSI ■ Name HFSI and displays the remaining life
■ % Remaining information. The non-CRUM supply
■ Reset HFSI item life counters can be reset:
■ Fuser

■ Transfer Belt

■ Transfer Roller

Diagnostics Provides access to specific component controls and test patterns.

dc140 Analog ■ ID Provides the ability to monitor analog
Monitor ■ Component Name inputs for diagnostic troubleshooting.
■ Status
■ Range
■ Value
dc312 Network ■ Protocol Verifies the connectivity of the printer
Echo Test ■ TCP/IP on the attached network and test the
■ Novell or IPX network drivers on the printer.
■ Apple Talk

■ Start Test
dc330 ■ Chain Link, I/O, Provides a means of testing the
Component Description operation of individual machine
Control ■ Chain Link, I/O, electrical and mechanical components.
Description, State
■ Chain
■ Add
dc575 Scanner ■ Duration, Test, Result Verifies operation of the IIT Scanner
Test ■ Start assembly:
■ DRAM Test

■ Home Position Test

■ Lock Check Test

■ Optical Test

dc612 Print ■ #, Test Patterns Provides test patterns for the service
Test Pattern ■ Tray provider to use while troubleshooting
■ Copies print-quality problems.
■ Start
■ Stop

4-20 WorkCentre 6400 Service Manual

General Troubleshooting

Service Diagnostic Routine Table (continued)

Test Control Panel Display Test Description

dc640 Video ■ Start Validates the integrity of the various
Path Integrity ■ Close ASICs and FPGA’s that comprise the
video path on the copy controller
board.
Adjustments Contains service diagnostic/mode routines that modify or change a
value setting for the printer.
dc130 Image ■ Paper Supply Aligns the whole ROS image on the
Position ■ Print Test Sheet Image Transfer Belt for each media
(Margin ■ Advanced group and paper tray.
Calibration) ■ Paper Type

■ Paper Trays

■ Reset All

dc131 NVM ■ Enter NVM ID (left) Provides the capability to review and
Read/Write ■ Enter NVM ID (right) modify machine control parameters
(refer to “NVM ■ Read stored in Non-Volatile Memory (NVM).
Value” on ■ Value Field The Copy Controller and Fax NVM can
page A-78 for ■ Write be accessed using dc131.
Copy Controller ■ Table (NVM ID,
and Fax NVM Description, Value,
Tables) Default, Min., Max.)
■ Clear
dc 301 NVM ■ Domain Allows the user to reset the Copy
Initialization ■ NVM Data Controller or Fax Controller NVM value
to default value or all applicable NVM
within a specified service or module.
Multiple services and/or modules may
be initialized by a single request.
dc361 NVM ■ Location Backups NVM data or restores the
Save and ■ Serial Number machine's NVM parameters to their
Restore ■ Date previous values following a service
■ Platform action, replacement of CC NVM
Module, CC Hard Disk, I/P Board, or
any others that would necessitate a full
NVM initialization and restoration.
dc608 ■ List of instruction Checks the registration and de-skew of
Document ■ Start the document glass and DADH and
Feeder correct any misalignments.
Registration
dc609 ■ List of instruction Checks the image registration of the
Document ■ Start Document Glass and corrects any
Platen misalignments.
Registration
dc909 Calibrate ■ Print Test Sheets Provides the ability to adjust the 2nd
for Paper Type ■ View Paper Type Image Transfer Power output (ATVC) in
Settings (various types order to compensate for the use of
of paper) thick or specialty media.

WorkCentre 6400 Service Manual 4-21

General Troubleshooting

Service Diagnostic Routine Table (continued)

Test Control Panel Display Test Description

dc936 Image ■ Start Calibration Re-calibrate the IOT at any time in
Quality order to correct common imaging
Calibration defects such as color mis-registration
and low density.
dc960 Altitude ■ Standard Altitude Use to change the altitude when the
Adjustment ■ High Altitude product is placed in a location where
■ Cancel the altitude is equal or greater than
■ Save 2000 meters (approximately 6500 feet)
in elevation.
Maintenance Provides the ability to perform maintenance routines and access
CRU/HFSI usage and Fault logs.
dc103 Billing ■ Billing Plan Passcode Allows the user to update the billing
Plan ■ Cancel plan.
■ Save
dc120 Fault ■ Table (Chain-Link, Provides Fault information including:
Counters Description, ■ Chain Link
Occurrences)
■ Description
■ Sort on Occurrences
■ Occurrences
■ Include Zero
Occurrences
■ Chain
■ Find
dc122 Fault ■ Chain Link Provides the most recent (last 40)
History ■ Description Faults including:
■ Date & Time ■ Chain Link

■ Description

■ Last Occurrence

dc135 CRU/ ■ Type Provides read access to each CRU/

HFSI Status ■ Name HFSI and displays the remaining life
and Reset ■ % Remaining information. The non-CRUM supply
■ Reset HFSI item life counters can be reset:
■ Fuser

■ Transfer Belt

■ Transfer Roller

dc137 ■ Disabled Enables or disables PagePack feature.

PagePack ■ Enabled
■ PagePack Passcode

■ Cancel
■ Save
Call Closeout Provides the ability to exit Diagnostics and clear specific counters.
Call Closeout ■ Reset Counters Exits the Service Diagnostics menu.
■ Exit Only
■ Exit and Reboot

4-22 WorkCentre 6400 Service Manual

General Troubleshooting

Service Info

dc104 - Usage Counters

The User Counters (dc104) routine allows the user to view the usage
information of the printer.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Service Info tab.
3. Select dc104 Usage Counters.
4. The dc104 Usage Counters screen is displayed. From the pull down
menu, select the appropriate counter to view.
■ Impression Counters
■ Sheet Counters
■ Images Sent Counters
■ Fax Impressions Counters
■ All Usage Counters
5. Touch the Close button to exit the Usage Counters screen.

dc108 - Software Version

Software version numbering enables the user to accurately determine what

software is installed on the device.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Service Info tab.
3. Select dc108 Software Version.
4. The System Software Version screen is displayed.
5. Touch the Close button to exit the dc108 Software Versions screen.

dc120 - Fault Counters

The Fault Counters (dc120) routine provides the faults raised by the machine
and the number of occurrences, sort the counters by occurrences, find a
specific chain module and include fault counters with zero counts.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Service Info tab.
3. Select dc120 Fault Counters.
4. A Retrieving fault counters... progress screen is displayed.
5. Select the appropriate options to find the Fault.
■ Sort on Occurrences
■ Include Zero Occurrences
■ Chain (enter a specific chain number)
6. Touch the Close button to exit the dc120 Fault Counters screen.

WorkCentre 6400 Service Manual 4-23

General Troubleshooting

dc122 - Fault History

This Fault History (dc122) routine allows the user to view the most recent (last
40) faults.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Service Info tab.
3. Select dc122 Fault History.
4. A Fault History screen is displayed. Information includes:
■ Chain Link
■ Description
■ Date & Time
5. Select the Fault to be reviewed. Select Details.
6. A Details screen is displayed. Information includes:
■ Chain Link
■ Description
■ Date & Time
■ Copy Count
■ Paper Size
7. Touch the Close button to exit the Details screen.
8. Touch the Close button to exit the dc122 Fault History screen.

dc135 - CRU/HFSI

The CRU/HFSI (dc135) routine provides read access to each CRU/HFSI and
displays the remaining life information. The non-CRUM supply item life
counters can be reset.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Service Info tab.
3. Select dc135 CRU/HSFI.
4. A dc135 CRU/HFSI screen is displayed. Information includes:
■ Type
■ Name
■ % Remaining
5. To reset a non-CRUM supply item, select the item. Touch the Reset HFSI
button to reset the life counter.
■ Fuser
■ Transfer Belt
■ Transfer Roller
6. Touch the Close button to exit the dc135 CRU/HFSI screen.

4-24 WorkCentre 6400 Service Manual

General Troubleshooting

Diagnostics

dc140 - Analog Monitor

The Analog Monitor (dc140) routine provides the ability to monitor analog
inputs for diagnostic troubleshooting.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Diagnostics tab.
3. Select dc140 Analog Monitor.
4. A dc140 Analog Monitor screen is displayed. Information includes:
■ ID
■ Component Name
■ Status
■ Range
■ Value
5. Select the item to be monitored. Select Start.
6. The value is displayed for the selected component.
7. To stop the process, select Stop or Stop All.
8. Click the Close button to exit the dc140 Analog Monitor screen.

WorkCentre 6400 Service Manual 4-25

General Troubleshooting

dc312 - Network Echo Test

The Network Echo Test (dc312) routine tests the network drivers and verifies
the connectivity of the printer.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Diagnostics tab.
3. Select dc312 Network Echo Test.
4. A dc312 Network Echo Test screen is displayed.
5. Touch the Start button to begin the test.
6. A message is displayed when the test is completed.
7. Click the Close button to exit the Network Echo Test screen.

dc330 - Component Control

Component Control (dc330) routine can be accessed via the diagnostics tool
user interface, Component Control is used to monitor the logic levels of the
input devices and to control the state of the output devices independently of
the other system components.
All components of the following types may be operated with the Component
Control tool:

■ Inputs: Sensors, Switches, Thermistors and Motor Encoders

■ Outputs: Motors, Fans, Solenoids, Clutches, Indicator Lamps (e.g. LED's)

and Heaters.

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Diagnostics tab.
3. Select dc330 Component Control.
4. A dc330 Component Control screen is displayed. Information includes:
■ Chain Link
■ I/O
■ Description
5. From the Chain pull-down menu, select the Chain to be performed.
6. Select the component to be performed.
7. Select Add.
8. Select the added component.
9. Select Start to perform the test.
10. Select Stop/Stop All to stop the test.
11. To remove the Component from the list, select Remove.
12. Touch the Close button to exit the dc330 Component Control screen.

Note
All Motor, Clutch, and Solenoid tests display as On/Off states. The test
also allow for audible and visual confirmation of operation where
applicable. Refer to the “dc330 Component Control Table” on page 4-27
for specific details of each test.

4-26 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table

Chain Detection of
I/O Description Note
Link State

Chain 005

005.011 O DADF Simplex Visual

Motor ■ State: On/Off

■ Paper fed

WorkCentre 6400 Service Manual 4-27

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

005.108 I DADF Jam Detect Visual Place paper at DADF Jam

Sensor ■ State: Hi/Low Detect Sensor or toggle
sensor by hand to see state
change.
■ Hi = Paper present

■ Low = Paper not present

005.111 I FB Home Position Visual Note: This test is a Status

Sensor ■ State: Hi/Low Only test.

005.112 I FB Cover Open Visual Open the Scanner Assembly

Sensor ■ State: Hi/Low for state change.
■ Hi = Open

■ Low = Closed

005.113 O ADF Motor Test Audible

600x300 Color
005.114 O ADF Motor Test Audible
600x600 Color
005.115 O ADF Motor Test Audible
600x300 Mono
005.116 O ADF Motor Test Audible
600x600 Mono
005.227 I DADH Media Visual Verify state change with width
Outer Width ■ State: Hi/Low adjustments.
Sensor
005.228 I DADH Media Visual Verify state change with width
Inner Width ■ State: Hi/Low adjustments.
Sensor
005.229 I DADH Media Visual Insert Legal size media and
Legal Length ■ State: Hi/Low compare states returned with
Sensor description given.

Chain 010

010.005 O Fuser Motor Visual Remove the Fuser prior to

■ State: On/Off performing the test.
Requirements for running this
test:
1. The Fuser is removed.
2. +24 V Fuser Motor Switch
is enabled (defeat the Fuser
In Switch (MS4) with a
piece of paper).
3. All doors and covers are
closed.
4. No existing jams.
5. No existing printer faults.

4-28 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table (continued)

Chain 012

012.003 O Finisher Transport Audible

Motor
012.004 O Finisher Exit Audible
Motor
012.016 O Finisher Media Audible
Eject Motor
012.017 O Finisher Align Audible
Motor
012.018 O Finisher Exit Audible
Roller Up/Down
Motor
012.057 O Finisher Tray Up/ Audible
Down Motor

WorkCentre 6400 Service Manual 4-29

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

012.120 O Finisher Fan Audible

012.122 O Finisher Entrance Audible
Solenoid
012.129 O Staple Motor Audible
012.147 O Finisher Media Audible
Level Lever
Solenoid
012.157 O Finisher Align Belt Audible
Up/Down
Solenoid
012.158 O Finisher Paddle Audible
Solenoid
012.283 I Finisher Cover Visual
Sensor ■ State: Hi/Low

012.284 I Stapler Cover Visual

Switch ■ State: Hi/Low
012.285 I Finisher Self- Visual Open the Stapler Cover and
Priming Sensor ■ State: Hi/Low remove the cartridge to see a
state change.
■ Low = Cartridge removed

■ Hi = Cartridge installed

012.286 I Staple Empty Visual Open the Stapler Cover and

Sensor ■ State: Hi/Low remove the cartridge to see a
state change.
■ Hi = Cartridge removed

■ Low = Cartridge with

staples present
012.287 I Stapler Home Visual 1. Open the Stapler Front
Position Sensor ■ State: Hi/Low Cover.
2. Remove the two screws
holding the Top Cover to
the Staple Unit.
3. Remove this cover for gear
access.
4. Rotate the gear to Home
position for reporting the Hi
state.
5. Rotate the gear away from
Home position for reporting
the Low state.
012.301 I Finisher Entrance Visual
Sensor ■ State: Hi/Low

4-30 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

012.302 I Finisher Transport Visual Lift the Top Cover and press
Section Sensor ■ State: Hi/Low the Sensor down to see state
change.
■ Low = No paper present

■ Hi = Paper present

012.304 I Finisher Media Visual

Full Sensor ■ State: Hi/Low

012.305 I Finisher Media Visual The Eject Motor must be

Ejector Sensor ■ State: Hi/Low activated in order to see the
sensor state change. Verify
the sensor state, activate the
finisher media ejector motor
(012-016), then confirm the
sensor state has changed.
1. Enter dc330 Component
test.
2. Add, and Start, the Finisher
Media Ejector Sensor (012-
305) test.
Touch Start and verify the
reading is Low.
1. Remove the Finisher Media
Ejector Motor (012-016)
test.
2. Stop, and Remove, the
Finisher Media Eject Motor
(012-016) test.
3. Add, and Start, the Finisher
Media Ejector Sensor (012-
305) test.
4. Verify the reading now
reports Hi.
012.306 I Finisher Aligning Visual Move the paddle by hand to
Plate Home ■ State: Hi/Low invoke a state change.
Position Sensor ■ Hi = Home position

■ Low = Away from Home

012.307 I Finisher Storage Visual Toggle the flag in middle of

Section Sensor ■ State: Hi/Low the Lower Tray to see state
change.
■ Low = No paper present

■ Hi = Paper present

012.308 Finisher Exit Visual Move the Exit Roller up and

Roller Sensor ■ State: Hi/Low down for state change to
occur.
■ Hi = Up

■ Low = Down

WorkCentre 6400 Service Manual 4-31

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

012.309 I Finisher Media Visual

Level Sensor1 ■ State: Hi/Low

012.310 I Finisher Media Visual Toggle sensor at lower output

Level Sensor2 ■ State: Hi/Low tray for state change.
Hi until activated Low.
012.311 I Finisher Aligning Visual Rotate the black gear near the
Belt Sensor ■ State: Hi/Low Transport Motor. when the
gear locks in with the other
gears state changes to Hi.
■ Low = Idle or Home
position
012.312 I Finisher Tray Visual 1. Remove the Tray Cover and
Upper Sensor ■ State: Hi/Low Motor Cover.
2. Remove the Motor.
3. Insert the Tray Assembly
into the printer.
4. Move the tray to the upper
limit position by hand while
watching this test item
change state to Hi.
■ Low = Low Tray position.

012.313 I Finisher Tray Visual Block the Sensor to change

Lower Sensor ■ State: Hi/Low the state.
■ Low = Not blocked

■ Hi = Blocked

Chain 042

042.019 O Fuser Cooling Fan Audible

Mid Speed
042.020 O Fuser Cooling Fan Audible
High Speed
042.043 O Ozone Fan Audible
042.051 O LVPS Cooling Fan Audible
High Speed
042.052 O Cooling Fan High Audible
Speed
042.053 O Cooling Fan Mid Audible
Speed

Chain 061

061.001 O Laser Unit Motor Audible

Chain 062

062.007 O Scanner Motor Audible

Test

4-32 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

Chain 071
071.003 O Tray 1 Paper Feed Audible
Clutch
071.201 I Tray 1 Paper Visual
Empty Sensor ■ State: Hi/Low

Chain 072
072.003 O Tray 2 Paper Feed Audible
Clutch
072.201 I Tray 2 Paper Visual
Empty Sensor ■ State: Hi/Low

072.204 I Tray 2 Paper Size Visual Remove Tray 2.

Switch 1 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 2 Switch Logic
Table” on page 4-38 for Logic
Switch and corresponding
media sizes.
072.205 I Tray 2 Paper Size Visual Remove Tray 2.
Switch 2 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 2 Switch Logic
Table” on page 4-38 for Logic
Switch and corresponding
media sizes.
072.206 I Tray 2 Paper Size Visual Remove Tray 2.
Switch 3 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 2 Switch Logic
Table” on page 4-38 for Logic
Switch and corresponding
media sizes.

Chain 073

073.001 O Tray 3 Feed Motor Audible

073.004 O Tray 3 Paper Feed Audible
Clutch
073.201 I Tray 3 Paper Visual
Empty Sensor ■ State: Hi/Low

WorkCentre 6400 Service Manual 4-33

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

073.202 I Tray 3 Paper Feed Visual Open the Cover for Tray 3 on
Sensor ■ State: Hi/Low the right side of printer.
Manually insert paper into the
Feed Sensor and execute this
test to see state change to Hi.
■ Lo = No paper present

■ Hi = Paper present

073.203 I Tray 3 Cover Visual Open the Cover for Tray 3 on

Open Sensor ■ State: Hi/Low the right side of printer.

073.204 I Tray 3 Paper Size Visual Remove Tray 3.

Switch 1 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.
073.205 I Tray 3 Paper Size Visual Remove Tray 3.
Switch 2 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.
073.206 I Tray 3 Paper Size Visual Remove Tray 3.
Switch 3 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.

Chain 074

074.001 O Tray 4 Feed Motor Audible

074.004 O Tray 4 Paper Feed Audible
Clutch
074.201 I Tray 4 Paper Visual Open the Cover for tray 4 on
Empty Sensor ■ State: Hi/Low the right side of printer.
Manually insert paper into the
Feed Sensor and execute this
test to see state change to Hi.
■ Lo = No paper present

■ Hi = Paper present

4-34 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

074.202 I Tray 4 Paper Feed Visual Open cover for tray 4 on right
Sensor ■ State: Hi/Low side of printer. Manually
insert paper into feed sensor
and execute this test to see
state change to Hi.
■ Lo = No paper present

■ Hi = Paper present

074.203 I Tray 4 Right Visual Open the Cover for Tray 4 on

Cover Open ■ State: Hi/Low the right side of printer.
Sensor
074.204 I Tray 4 Paper Size Visual Remove Tray 4.
Switch 1 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.
074.205 I Tray 4 Paper Size Visual Remove Tray 4.
Switch 2 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.
074.206 I Tray 4 Paper Size Visual Remove Tray 4.
Switch 3 ■ State: Hi/Low Execute the test and press the
appropriate Paper Size Switch
for a state change.
Refer to “Tray 3/4 Switch
Logic Table” on page 4-38 for
Logic Switch and
corresponding media sizes.

Chain 077

077.018 O Duplex Forward Audible

Motor
077.020 O Duplex Reverse Audible
Motor
077.102 I OHP Sensor Visual Insert paper in the vertical
■ State: Hi/Low path to block the OHP sensor
and verify the state changes.
077.109 I Duplex Sensor Visual Open the Duplex Unit Door
■ State: Hi/Low and toggle the Sensor Flag for
a changed state.
■ Hi = Paper present

■ Low = Paper not present

WorkCentre 6400 Service Manual 4-35

General Troubleshooting

dc330 Component Control Table (continued)

4-36 WorkCentre 6400 Service Manual

General Troubleshooting

dc330 Component Control Table (continued)

Chain Detection of
I/O Description Note
Link State

Chain 094
094.002 O Pressure Audible
Retraction 1st
Image Transfer
Clutch
094.005 O Pressure Audible
Retraction 2nd
Image Transfer
Clutch
094.200 I Retraction Visual Retract the Lever for Position
Position Sensor ■ State: Hi/Low Sensor 1.
1st Image
094.201 I Retraction Visual Retract the Lever for Position
Position Sensor ■ State: Hi/Low Sensor 2.
2nd Image

WorkCentre 6400 Service Manual 4-37

General Troubleshooting

Tray 2 Switch Logic Table

Tray 2 Paper Size Switch Paper Size

SW1 SW2 SW3

ON OFF OFF A4
OFF ON OFF Letter
ON OFF ON Executive
ON ON OFF B5
OFF ON ON Postcards
ON ON ON Non-standard size
OFF OFF OFF Tray open

Tray 3/4 Switch Logic Table

Tray 3/4Paper Size Switch Paper Size

SW1 SW2 SW3

OFF ON ON Legal
ON ON ON Government Legal/Letter Plus
ON ON OFF A4
ON OFF OFF Letter
OFF OFF ON B5
ON OFF ON Executive
OFF OFF OFF Tray open

4-38 WorkCentre 6400 Service Manual

General Troubleshooting

dc575 - Scanner Test

The Scanner Test (dc575) routine provides a method to quickly exercise and
test the scanner components.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Diagnostics tab.
3. Select dc575 Scanner Test.
4. A dc575 Scanner Test screen is displayed. Information includes:
■ Duration
■ Test
■ Result
5. Select a test from the list.
■ DRAM
■ Home Position
■ Lock Check
■ Optical
6. Touch the Start button to begin the test.
7. An In Progress screen is displayed.
8. After the test is complete, the dc575 Scanner Test screen is displayed.
9. Touch the Close button to exit the dc575 Scanner Test screen.

WorkCentre 6400 Service Manual 4-39

General Troubleshooting

dc612 - Print Test Pattern

The Print Test Pattern (dc612) routine provides a diagnostic tool to assist in
identifying image copy/print quality problems.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Diagnostics tab.
3. Select dc612 Print Test Pattern.
4. A dc612 Print Test Pattern screen is displayed.
5. Select a test pattern from the list.
■ Cyan 50% Fill
■ Magenta 50% Fill
■ Yellow 50% Fill
■ Black 50% Fill
■ Registration Print
■ Delta-E Print
■ Ghosting Print
6. Select the appropriate option for the test pattern page. Information
includes:
■ Tray
■ Copies
7. Touch the Start button to begin the test.
8. A test pattern page is printed.
9. Touch the Stop button to stop the test.
10. Touch the Close button to exit the dc612 Print Test Pattern screen.

Note
The Color mode and Plex mode options can not be changed from the
default selection.

4-40 WorkCentre 6400 Service Manual

General Troubleshooting

dc640 - Video Path Integrity

The Video Path Integrity (dc640) test validates the Copy Controller Module
(CCM) Video path.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Diagnostics tab.
3. Select dc640 Video Path Integrity.
4. A dc640 Video Path Integrity screen is displayed.
5. Touch the Start button to begin the test.
6. A Video Path Integrity in Progress screen is displayed.
7. When the test is complete, touch the Close button to exit the dc640
Video Path Integrity screen.

WorkCentre 6400 Service Manual 4-41

General Troubleshooting

Adjustments

Refer to Chapter 6 "Adjustments and Calibrations" for detailed procedures.

4-42 WorkCentre 6400 Service Manual

General Troubleshooting

Maintenance

dc103 - Billing Plan

Tiered Billing allows the user to update the billing plan.

1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Maintenance tab.
3. Select dc103 Billing Plan.
4. A dc103 Billing Plan screen is displayed.
5. In the Billing Plan Passcode menu, enter the passcode.

Note
If an invalid passcode is entered the system will display the Invalid
Passcode Fault Window.

6. Touch the Save button.

dc120 - Fault Counters

The Fault Counters (dc120) routine provides the faults raised by the machine
and the number of occurrences, sort the counters by occurrences, find a
specific chain module and include fault counters with zero counts.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Maintenance tab.
3. Select dc120 Fault Counters.
4. A Retrieving fault counters... progress screen is displayed.
5. Select the appropriate options to find the Fault.
■ Sort on Occurrences
■ Include Zero Occurrences
■ Chain
6. Touch the Close button to exit the dc120 Fault Counters screen.

WorkCentre 6400 Service Manual 4-43

General Troubleshooting

dc122 - Fault History

This Fault History (dc122) routine displays the most recent (last 40) shutdown
faults.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Maintenance tab.
3. Select dc122 Fault History.
4. A Fault History screen is displayed. Information includes:
■ Chain Link
■ Description
■ Date & Time
5. Select the Fault to be reviewed. Select Details.
6. A Details screen is displayed. Information includes:
■ Chain Link
■ Description
■ Date & Time
■ Copy Count
■ Paper Size
7. Touch the Close button to exit the Details screen.
8. Touch the Close button to exit the dc122 Fault History screen.

dc135 - CRU/HFSI Status and Reset

The CRU/HFSI (dc135) routine provides read access to each CRU/HFSI and
displays the remaining life information. The non-CRUM supply item life
counters can be reset.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Maintenance tab.
3. Select dc135 CRU/HSFI Status and Reset.
4. A dc135 CRU/HFSI screen is displayed. Information includes:
■ Type
■ Name
■ % Remaining
5. To reset a non-CRUM supply item, select the item. Touch the Reset HFSI
button to reset the life counter.
■ Fuser
■ Transfer Belt
■ Transfer Roller
6. Touch the Close button to exit the dc135 CRU/HFSI screen.

4-44 WorkCentre 6400 Service Manual

General Troubleshooting

dc137 - PagePack

The European "PagePack" program allows customers to purchase a device

and then pay a fixed amount each month for supplies and service. The
devices are sold as PagePack printers; there is no way of converting to/from
PagePack in the field.
The North American "PagePack" program has several key differences from
the original European program. The printer(s) are managed and monitored by
the PagePack Assistant (PPA) software, which is also responsible for sending
usage data back to Xerox. A printer can be converted to a PagePack printer in
the field. This is not possible in Europe, where the PagePack printers are
configured either at the manufacturer or installation’s location. (PPA is a client
application that runs on the customer's PC).
The "PagePack PIN" is a 4 digit code that is typically entered at the Local UI in
order to enable a PagePack printer. The PIN is an absolute requirement in
Europe, since it ensures timely registration of the PagePack contracts with
Xerox. When a European PagePack machine is powered up for the first time,
it can only be used for a limited number of prints until the PIN must be
entered. After the "grace" period the machine will not operate until a valid
authorization PIN is entered.
Entering a valid PIN allows the printer to be used, and enables the printer to
work with metered supplies (e.g. toner cartridges with special "metered"
CRUMs, specially shaped ink sticks, etc.).
The printer shall not allow more than 5 attempts at entering the PIN in any 24
hour period. If more than 5 attempts are made, PIN entry is locked out for 24
hours.
1. Enter the Service Diagnostics menu (page 4-7).
2. Touch the Maintenance tab.
3. Select dc1137 PagePack.
4. A dc137 PagePack screen is displayed.
5. Touch the Enabled button.
6. In the PagePack Passcode field, enter the PagePack 4 digit code.
7. Touch the OK button.
8. Touch the Cancel/Close button to exit the dc137 PagePack screen.

WorkCentre 6400 Service Manual 4-45

General Troubleshooting

Call Closeout

Service Mode Exit

The Service Mode Exit/ Call Closeout feature provides a method to reset
counters, exit service mode and reboot the printer.

Resetting Counters/ Exiting Service Diagnostics

1. Touch the Call Closeout tab.

2. Select Reset Counters as necessary.
3. Touch the Exit Only or Exit and Reboot button to reset the counters.
4. The main UI screen is displayed.

4-46 WorkCentre 6400 Service Manual

General Troubleshooting

Entering Machine Status/ Tools Menu

The Tools menu provides access to printer settings and calibrations.

Note
In the event the System Administrator login no longer uses the default
password and the Tools menu is not accessible, these tools can be
accessed by using the Service Copy Mode (CSE Mode).

1. Press the Log In/Out button.

2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the Password field, enter 1111 (default password).
5. Touch the Enter button.
6. The login button, in the upper right of the screen, now says admin and
highlighted.

WorkCentre 6400 Service Manual 4-47

General Troubleshooting

Resetting UI to Factory Settings

The Reset UI to Factory Settings procedure restores the UI features settings

in non-volatile memory to their factory default values. All current values set by
the customer will be lost.

Caution
Use the Reset UI procedure as a last option when servicing the
WorkCentre 6400.

1. Print a Configuration Page.

2. Press the Machine Status button to access the UI menu.
3. Touch the Tools button.
4. Touch the Device Settings button.
5. Under the Features screen, scroll down the menu and select Reset UI to
Factory Settings.
6. Touch the Reboot button.
7. A message Please wait for the software to reset is displayed.

Caution
Do not turn Off the printer while Resetting UI process is in progress.

7. The printer reboots after the Resetting UI process is complete.

4-48 WorkCentre 6400 Service Manual

General Troubleshooting

Software Reset

The Software Reset routine allows the user to reset the printer software for
the Copy Controller, Network Controller, or both.
1. Press the Machine Status button to access the UI menu.
2. Touch the Tools button.
3. Touch the Troubleshooting button.

Note
The user needs to be logged in as admin (if security option is enabled) to
see the resets option.

4. Under the Features screen, select Resets.

5. Select Software Reset.
6. The Software Reset menu is displayed. Select the appropriate reset
option.
■ All Software - Resets both Network and Controller software
■ Network Software - Resets only Network software
■ Controller Software - Resets only Controller software
7. Touch the Reset button.
8. A Software Reset Confirmation screen is displayed.
9. Touch the Reset button to begin the process.
10. A System Restart screen is displayed.

Caution
Do not turn Off the printer while Software Reset process is in progress.

11. The system automatically reboots after Software Reset process is

complete.

WorkCentre 6400 Service Manual 4-49

General Troubleshooting

Service Copy Mode

Service Copy Mode routine allows the CSE to access the customer copy
screens for the purpose of running test copy jobs. The CSE can use this test
to assist with identifying a wide range of problems from paper feed, copy
transportation, finishing, document handling and poor copy quality.
Service Copy Mode provides a local login method for the CSE that bypasses
the controlled access applications and therefore allow the CSE to run copy
jobs for test purposes.
Service Copy Mode also allows the CSE to access settings and calibrations
found in the Machine Status/Tools Menu in the event the menu is locked by
the customer. Information Pages can not be printed because only copy jobs
can be ran when in Service Copy Mode.
While in Service Copy Mode the total impressions counters are incremented
to keep an accurate count of the total impressions created by the engine.
However, the color copied impressions and black copied impressions are not
incremented so the customer will not be charged for these under a billing
plan.
1. Press the “*” + “#” + “Stop” buttons simultaneously to access the Service
Copy Mode menu.
2. In the field on the UI screen, enter 2732.
3. Touch the Enter button.
4. The login button, in the upper right of the screen, now says CSE and is
highlighted.
5. Be sure to log out when troubleshooting is complete.

4-50 WorkCentre 6400 Service Manual

General Troubleshooting

Cloning

Cloning allows the customer or CSE to clone the configuration data of the
printer. The Clone feature will create a .dlm file that can be used to configure
other machines or copy the customers configuration data back to the printer
after a service procedure (replacement of a hard drive). All machines must
have the same version of software for the .dlm file to be accepted. All default
information should be selected when performing Cloning.

■ Accounting

■ Administration

■ Audit Log
■ Authentication & Authorization Configuration

■ Connectivity Settings

■ E-Mail

■ Fax

■ Internet Fax

■ Internationalization

■ Job Management

■ Security

■ SMart eSolutions

■ System Disk

■ Power Saver

■ Print Settings

■ Workflow Scanning

■ Templates

■ Device Upgrade

■ Web Services

To access the Cloning function:

1. In a web browser, enter the printer IP address.
2. In the upper right corner, click login.
3. In the User ID field, enter admin (default User ID).
4. n the password field, enter 1111 (default password).
5. Click the Login button.
6. From the top menu, click Properties.
7. Under the Configuration Overview > Cloning page, click View,
8. Verify all boxes on the Cloning page are checked.
9. Click the Clone button.
10. A progress bar is displayed on the bottom of the page.
11. A Cloning Instructions page is displayed when Cloning process is
complete.

WorkCentre 6400 Service Manual 4-51

General Troubleshooting

12. Right-click the Cloning.dlm link to save the file to appropriate location.

Note
A crossover cable and laptop computer are required to perform cloning.

4-52 WorkCentre 6400 Service Manual

General Troubleshooting

Control Panel Troubleshooting

Control Panel LED’s Do Not Light

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the Image Processor Board with the 2 standoff screws.

■ Power cycle the printer.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ Control Panel, PL2.12 ■ “Print Engine - Image Processor Board,

■ UI Main PWB, PL2.14 LVPS, Power Switch” on page 10-38
■ UI Slave PWB, PL2.15
■ LVPS, PL10.17
■ Image Processor Board, PL20.07

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the features button flash 6 Go to step 4. Go to step 2.

times in a row?
2 Check the "All Power OK" indicator Go to step 4. Go to step 3.
LED (refer to the POST LED’s
illustration on page 4-5) on the
Image Processor Board.
Is the LED on?
3 Check the LVPS to Image Processor Replace the Replace the
Board voltages. Image Processor LVPS
Is 3.3v (J101 Pins 1~4) present? Board (page 8-82).
(page 8-98).
4 Does the CN_Scanner connector Go to step 5. Replace the
have 3.3v on the appropriate yellow LVPS
wire (see the “Voltage Chart” on (page 8-82).
page 4-54)?
5 Is the Interface Cable connected to Go to step 6. Reseat the
JX301on the Main Board? connector.
6 In the UI Diagnostics LED Test, do all Go to step 7. Replace the UI
of the UI main board indicators light? Main Board
(page 8-75).

WorkCentre 6400 Service Manual 4-53

General Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

7 In the UI Diagnostics LED Test, do all Troubleshooting Go to step 8.
of the UI slave board indicators light? complete.
8 Is the Flat Cable, Board connected to Go to step 9. Reseat the
JX502 of the UI Main Board and connector.
JX301 of the UI Slave Board?
9 Replace the UI Slave Board Replace the Troubleshooting
(page 8-75). Control Panel complete.
Does the error still occur? (page 8-46).

Voltage Chart

GND 3.3v GND 24.0v

(Green) (Yellow) (Green) (Red)

GND 11.0v GND 5.0v

(Green) (Pink) (Green) (Yellow)

4-54 WorkCentre 6400 Service Manual

General Troubleshooting

Control Panel LED’s are On, Control Panel Display is Blank

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the Image Processor Board with the 2 standoff screws.

■ Power cycle the printer.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Component Control Code

■ Control Panel, PL2.12

■ UI Main PWB, PL2.14
■ Color LCD Module, PL2.16
■ Flat Cable, Video, PL2.17
■ Image Processor Board, PL20.07

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Power cycle the printer. Go to step 2. Troubleshooting

Does the problem still occur? complete.
2 Does the features button flash 6 Go to step 3. Replace the
times in a row? color LCD
Module
(page 8-75).
3 Is the Interface Cable connected to Go to step 4. Reseat the
JX301on the Main Board? connector.
4 Is the Flat Cable, Video connected to Go to step 5. Reseat the
JX701 on the main board and CN1 on connector.
the LCD module?
5 Replace the Flat Cable, Video Go to step 6. Troubleshooting
(page 8-75). complete.
Does the error still occur?
6 Replace the Main PWB (page 8-75). Go to step 7. Troubleshooting
Does the error still occur? complete.
7 Replace the LCD Module Go to step 8. Troubleshooting
(page 8-75). complete.
Does the error still occur?
8 Replace the Control Panel Replace the Troubleshooting
(page 8-46). Image Processor complete.
Does the error still occur? Board
(page 8-98).

WorkCentre 6400 Service Manual 4-55

General Troubleshooting

Inoperable Printer Troubleshooting

Printer Continually Displays “The Fuser is Warming Up”

Initial Actions

■ Verify the correct Fuser (110 V vs. 220 V) is installed in the printer.

■ Cycle printer power.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ LVPS, PL10.17 ■ “Print Engine - Image Processor Board,

■ Fuser Unit, PL18.01 LVPS, Power Switch” on page 10-38
■ “Print Engine - Fuser, Paper Full Sensor,
Exit Sensor, Switches” on page 10-40

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the AC input voltage. Go to step 2. Check the wiring

Is the correct AC voltage present on harness
CN1_INP on the LVPS? connectors from
the power outlet
to PG1 to SW1
to CN1_INP.
Go to step 2.
2 Are there voltage being applied to Replace the Replace the
CN-FSR on the LVPS? Fuser Unit LVPS
(page 8-24). (page 8-82).

System Does Not Respond

If the system is not responding (hangs, continually resets or fails the boot up
sequence) it may be necessary to cycle the power. During the power up
sequence wait until it completes the initialization process or a reset the
machine message appears. If a reset the machine message appears attempt
to cycle the power again. This message may occur more than once before the
system is able to come to a ready state. If the printer does not reach a ready
state and no reset the machine message appears check the job status and
machine status button LED's and reference the POST LED's section on page
4-5. After making several unsuccessful attempts to reboot the system it may
be necessary to reload the software using the AltBoot process (refer to
page A-4).

4-56 WorkCentre 6400 Service Manual

General Troubleshooting

Power Cycle the Printer

One of the printer's internal components has encountered a problem which

requires turning the printer off then on in order to clear.

Initial Action

■ None

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are any of the error codes in the Confirm the Go to step 2.

WorkCentre 6400 Service Manual 4-57

General Troubleshooting

AC Power Supply Troubleshooting

Initial Actions

■ Ensure the printer is plugged directly in to an AC wall outlet.

■ Cycle printer power.

■ If problem persists, follow the procedure below.

Applicable Parts Wiring and Plug/Jack References

■ Switch (SW1), PL10.15 ■ “Print Engine - Image Processor Board,

■ LVPS, PL10.17 LVPS, Power Switch” on page 10-38

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the voltage at the AC wall Go to step 2. Notify the

outlet. customer of
Is there approximately 110 VAC (or improper AC
220 VAC if the printer is a 220 V output from the
configuration) at the AC wall outlet? outlet.
2 Check the power cord for defects or Replace or Go to step 3.
loose connection. reconnect the
Is the power cord loose or defective? power cord.
3 Is the appropriate voltage (110 VAC Replace the Replace Switch 1.
or 220 VAC) present at the LVPS LVPS
CN1_INP pin 2? (page 8-82).

4-58 WorkCentre 6400 Service Manual

General Troubleshooting

DC Power Supply Troubleshooting

LVPS

Initial Actions

■ Ensure the printer is plugged directly in to an AC wall outlet.

■ Cycle printer power.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ LVPS, PL10.17 ■ “Print Engine - Image Processor Board,

■ MCU Board, PL20.09 LVPS, Power Switch” on page 10-38

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the AC power. Go to step 2. Check the wiring

Is 120v (220v if a 220v harness
configuration) being supplied to connectors from
CN1_INP on the LVPS? the power outlet
to PG1 to SW1
to CN1_INP.
2 Check the LVPS Fuses. Go to step 3. Replace the
Do the fuses on the LVPS have LVPS Board
continuity? (page 8-82).
3 Are DC 24 V, DC 5 V, and DC 3.3 V Replace the MCU Replace the
being applied to PJ1 on the MCU Board LVPS Board
Board? (page 8-101). (page 8-82).

WorkCentre 6400 Service Manual 4-59

General Troubleshooting

Image Processor Board Troubleshooting

Initial Actions

■ Check fault history for pertinent chain-link codes. Troubleshoot the

specific code if applicable.

■ Power cycle the printer.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ Image Processor Board, PL20.07 ■ “Print Engine - Image Processor Board,
LVPS, Power Switch” on page 10-38

Note
The ribbon cable connections have a lock. Be sure to unlock the
connectors before removing the ribbon cables to prevent damage.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does POST diagnostics indicate a Replace the Go to step 2.

problem with the Image Processor applicable parts.
Board or one of its components
(refer to POST Fault Code Tables on
page 4-5)?
2 Remove and reseat the Image Go to step 3. Troubleshooting
Processor Board connectors. complete.
Does the error still occur?
3 Check the "All Power OK" indicator Go to step 4. Go to “DC Power
LED (refer to the I/P Board LED’s Supply
illustration on page 4-6) on the Troubleshooting”
Image Processor Board. on page 4-59.
Is the LED on?
4 Check the LVPS to Image Processor Replace the Go to “DC Power
Board voltages. Image Processor Supply
Is 3.3v (J101 Pins 1~4), 5v (J102 Board Troubleshooting”
Pins 1 & 3) and 24v (J102 Pin 5) (page 8-98). on page 4-59.
present?

4-60 WorkCentre 6400 Service Manual

General Troubleshooting

DADF Troubleshooting

Frequent Paper Jam

Initial Actions

■ Check the paper path for debris or obstructions.

■ Check the original documents for wrinkles or tears and use the document
glass if necessary.

■ Ensure the original documents are not above the paper fill line (maximum
50 pages).

■ Make sure the original documents are free of staples and paper clips,
remove as necessary.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ DADF Roller Kit Assembly, PL1.03
■ DADF Assy, PL1.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the paper correctly loaded in the Go to step 2. Reposition the

tray? paper in the tray.
2 Check the placement of the paper Go to step 3. Reposition the
guides. guides.
Are the guides in the correct
position?
3 Check the following for evidence of Replace the Replace the
fault or damage: DADF Roller Kit DADF Assembly
■ Separator Pad Assembly, PL1.01 Assembly, (page 8-38).
■ Separator Roller Assembly, PL1.02 PL1.03.
■ Holder Assembly, PL1.07

■ Holder Assembly, PL1.08

WorkCentre 6400 Service Manual 4-61

General Troubleshooting

Frequent Double Feed and Skew

Initial Actions

■ Check the paper path for debris or obstructions.

■ Check the original documents for wrinkles or tears and use the document
glass if necessary.

■ Ensure the original documents are not above the paper fill line (maximum
50 pages).

■ Make sure the original documents are free of staples and paper clips,
remove as necessary.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ DADF Roller Kit Assembly, PL1.03

■ DADF Assy, PL1.06

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the paper correctly set in the paper Go to step 2. Reposition the

chute? paper in the tray.
2 Check the placement of the paper Go to step 3. Reposition the
guides. guides.
Are the guides in the correct
position?
3 Check the following for evidence of Replace the Go to step 4.
fault or damage: DADF Roller Kit
■ Separator Pad Assembly, PL1.01 Assembly,
■ Separator Roller Assembly, PL1.02 PL1.03
■ Holder Assembly, PL1.07

■ Holder Assembly, PL1.08

4 Run the ADF Calibration procedure. Replace the Troubleshooting

Is the image still skewed? DADF Assembly complete.
(page 8-38).

4-62 WorkCentre 6400 Service Manual

General Troubleshooting

Scanner Troubleshooting

Scanner Fault Troubleshooting

The scanner has reported a failure or is not performing as expected.

Initial Actions

■ Confirm the Scanner interface cable connector is correctly seated and

secured to the IP Board with the 2 standoff screws.

■ Power cycle the printer.

■ If problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ Scanner Assy, PL2.01 ■ “Print Engine - Image Processor Board,

■ LVPS, PL10.17 LVPS, Power Switch” on page 10-38
■ Image Processor Board, PL20.07
■ MCU Board, PL20.09

Note
To access the CN_SCANNER connector, secure the DADF to the scanner
Flat Bed, remove the two hinge plates from the scanner hinges, and raise
the Control Panel (Scanner Assembly) to 90°. The CN_SCANNER
connector is located on the bottom right corner of the scanner Flat Bed.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the "All Power OK" indicator Go to step 4. Go to step 2.

LED (refer to the I/P Board LED’s
illustration on page 4-6) on the IP
Board.
Is the LED on?
2 Does the CN_SCANNER connector Go to step 4. Go to step 3.
have all the appropriate voltages (see
the “Voltage Chart” on page 4-64)?
3 Does PJ38MCU have 11v on pins 1 & Replace the Replace the MCU
3? LVPS Board
(page 8-82). (page 8-101).
4 Perform the Scanner Test Function Go to step 5. Troubleshooting
checks (dc575 - page 4-39) in complete.
Diagnostics.
Does the error still occur?

WorkCentre 6400 Service Manual 4-63

General Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Replace the Scanner Assembly Replace the Troubleshooting
(page 8-42). Image Processor complete.
Does the error still occur? Board
(page 8-98).

Voltage Chart

GND 3.3v GND 24.0v

(Green) (Yellow) (Green) (Red)

GND 11.0v GND 5.0v

(Green) (Pink) (Green) (Yellow)

4-64 WorkCentre 6400 Service Manual

General Troubleshooting

Fax Troubleshooting

The Control Panel displays one of these errors related to Fax operation:

■ “Fax Memory is Low” indicates insufficient room, for Fax images stored on
the Copy Controller Hard Drive. The CC Hard Drive has a separate
partition dedicated to storing images waiting to be printed, stored for
polling or Fax Mailboxes.

Fax and LAN Fax services are disabled. User intervention is required to
delete unnecessary mailbox images or fax jobs stored for polling.

■ “No Dial Tone Detected” indicates that the system did not detect a dial
tone when attempting to send a Fax. Fax and LAN Fax services are
disabled. Fax subsystem parameters are adjustable and jobs received
before the dial tone was lost are accessible.

■ “Line 1 Unavailable: indicates a communication error has occurred. Fax

and LAN Fax are disabled.

In addition to the Control Panel messages, the system provides several built-
in tools for troubleshooting Fax problems.

Initial Fax Checks

Check these items first. Use a desk telephone and a second, known-good
phone line to test Fax line function.

■ Check that Fax is enabled and configured properly for the local phone
line.

■ Check the target Fax number. If the number is in memory, is it saved

correctly?

■ Call the target Fax number from a desk phone and confirm a Fax tone
response.

■ Use a desk phone to confirm a dial tone on the FAX line supporting the
system.

■ Check Fax cord condition and connections between the system and Fax
line.

■ Enable Transmission Reports if reports aren’t being printed.

If the Fax line, Fax number, and cabling are all functional, use the following
tools to isolate the problem.

WorkCentre 6400 Service Manual 4-65

General Troubleshooting

Fax Troubleshooting Tools

The primary tools for troubleshooting Fax problems are Service Diagnostic
tests, The Fax Transmission Report, and the Fax Protocol Report. Diagnostic
test results, result codes provided on the Transmission Report, and
communication logs from the Protocol Report provide valuable clues to the
root cause of Fax errors. A Fax subsystem reset is also available on the
Control Panel menu to quickly restore factory default settings.

Fax Reset (dc301 NVM Initialization)

All fax user and system NVM data can be restored to factory default values
using the service diagnostic dc301 routine.

Caution
All customer programmed data, such as the Individual and Group Speed
Dial directories, are lost when a Reset Fax command is issued.

Fax Protocol Report

The Protocol Report provides transmission results, timing, and

communications activity information about each Fax transmission. Accessed
from the Machine Status -> Tools -> Service Settings -> Print Fax Reports
menu, the Protocol Report provides Job Details similar to the Transmission
Report, and a detailed log of the communications activity between devices.
Use this report to diagnose possible communications errors between
machines.
The most common commands exchanged between Fax machines during a
typical transfer of data are listed in the following table. When reviewing the
Protocol Report, trace the exchange of commands to identify irregularities.
Commands in parentheses (_) may or may not appear in the log.
Refer to the Appendix for a complete list of communication commands and
associated definitions.

Common Fax Communication Commands

Command Definition Appropriate Responses

(NSF) (CSI) DIS Negotiating capabilities from a (NSC) (CIG) DTC

manual receiver or an auto (TSI) DCS
answer terminal (NSF) (CSI) DIS
(CRP) (TSI) (NSS)
(PWD) (SEP) (CIG) DTC
(PWD) (SUB) (TSI) DCS
(NSC) (CIG) DTC Mode setting from calling (TSI) DCS
(PWD) (SEP) (CIG) terminal (NSF) (CSI) DIS
DTC This is a poll operation (CRP) (TSI) (NSS)
(TSI) DCS Mode setting from manual CFR
(TSI) (NSS) transmitter FTT
(PWD) (SUB) (TSI) or automatic receiver. (NSC) (CIG) DTC
DCS (NSF) (CSI) DIS
(CRP)

4-66 WorkCentre 6400 Service Manual

General Troubleshooting

Common Fax Communication Commands (continued)

Command Definition Appropriate Responses

CTC Mode setting from the (CTR)
transmitter to (CRP)
the receiver.
(EOR-NULL) Indicates the next block (ERR)
transmission (RNR)
from the transmitter to the (CRP)
receiver.
(EOR-MPS) or Indicate the next message (ERR)
(EOR-EOP) or transmission from the (RNR)
(EOR-EOM) or transmitter to the receiver PIN
(EOR-PRI-MPS) or (CRP)
(EOR-PRI-EOP) or
(EOR-PRI-EOM)
MPS or EOP or EOM or Post-message commands MCF
(PRI-MPS) or RTP
(PRI-EOP) or RTN
(PRI-EOM) PIP
PIN
(CRP)
(PPS-NULL) Post-message command for a (PPR)
partial page: from the MCF
transmitter to the (RNR)
receiver (CRP)
(PPS-MPS) or Post-message commands for a (PPR)
(PPS-EOP) or( complete page: from the MCF
PPS-EOM) or transmitter to the receiver (RNR)
(PPS-PRI-MPS) or PIP
(PPS-PRI-EOP) or PIN
(PPS-PRI-EOM) (CRP)
(RR) Ask for the status of the receiver: (RNR)
from the transmitter to the (ERR)
receiver MCF
PIP
PIN
(CRP)
DCN Phase E command None

WorkCentre 6400 Service Manual 4-67

General Troubleshooting

Fax Confirmation Report

The Transmission Report provides transmission status and activity

information about each Fax transmission. Generation of this report is optional
and is in an Error Only state by default. Use the menus: Machine Status ->
Tools ->Service Settings -> Embedded Fax Settings -> Setup Fax
Reports -> Confirmation Report to change the Error Only default. Also by
default, for the WorkCentre 6400, the Transmission Report includes a reduced
image of the document scanned for faxing. Result codes appear in the
Results box. The results format is <code><speed>. Where code is one of the
codes listed in Table 2. Speed is the transmission baud rate (i.e. 14400).
Typically, the results are CP<speed> for a completed Fax. Fax failures (FA)
may omit the speed if the system was unable to start the connection. The job
termination results (FA, TU, TS) count as errors for the purpose of printing a
Transmission Report.

Fax Result Codes

Code Definition Description

FA Fax Failed The system was unable to connect to the Remote

Station.
TU Terminated by user The transmission was canceled by the user.
TS Terminated by The system ran out of resources. Typically, memory.
system
CP Completed The system was able to deliver the Fax.

In addition to the Results codes, the Job Details section includes Mode and
Job Type codes.
Definitions of all these codes appears on each report.

Fax Troubleshooting Procedures

The following provides procedures and suggestions for correcting some

common problems.
1. Disable Junk Fax Prevention. This may prevent a Fax being received
because the machine does not recognize the sending phone number as
an acceptable source. Junk Fax Prevention compares the incoming caller
Fax Machine ID with ones listed in the Dial Directory. When not finding a
match, the Fax refuses the transmission.
2. Check the phone line. Especially if problems occur during receive and
transmit. Does the provider support Fax protocol? Is there noise on the
phone line? Is the phone line connected correctly? Is call forwarding on?
Is 'Secure Send or Receive' on? All these effect Fax transmission.
In the case of DSL, most DSL configurations share the same phone line
with analog signals used by standard phones and dial-up (analog)
modems. Typically a filter is installed between the DSL equipment and the
analog equipment attached to that line. DSL Performance varies based
on the quality and configuration of the specific site and equipment.
3. Reduce transmission speed. The WorkCentre 6400 uses 33.6 kbps by
default. Some phone lines and older Fax machines do not support these
speeds.

4-68 WorkCentre 6400 Service Manual

General Troubleshooting

Troubleshooting Sending or Receiving a Fax

Embedded fax is unable to consistently transmit or receive.

Initial Actions

■ Print a Configuration Report and confirm the model configuration

supports Embedded Fax (WC6400X, XF). Also confirm Fax is listed as
Installed/ Enabled in the Services section of the report.

■ Check the phone line condition and connections.

■ Check that Fax is configured properly for the local phone line.

■ Call the target Fax number from a desk phone and confirm a Fax tone
response.

■ Power cycle the Printer and confirm the Printer powers up to the "ready"
state.

■ If problem persists, follow the procedure below.

Note
WC6400S configuration does not support Fax.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

■ Fax Board, PL20.42

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Confirm the Fax service is setup. Is Perform the Fax Go to step 2.

the Fax feature box on the UI setup in the
Features screen grayed out? Embedded Fax
menu.
2 Check the Fax line using a phone. Go to step 3. Inform the
Does the phone ring? customer the
phone line
requires.
3 Check the Line 1 Setup settings in the Go to step 4. Modify the
Embedded Fax Menu. settings.
Are the settings correct?
4 Check the dialing activity using the Go to step 5. Replace the FAX
system speaker. Enable Audio Line Board
Monitor in the Tools -> Embedded (page 8-115).
Fax -> Transmission menu.
Does the system Fax Dial?

WorkCentre 6400 Service Manual 4-69

General Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the problem you are Go to step 6. Go to step 11.
troubleshooting related to receiving
a Fax?
Note: Auto Delay, Junk Fax
prevention, or Secure Receive
settings might impede inbound calls.
6 Check the following settings: Go to step 7. Modify the
■ Auto Answer Delay settings.
■ Junk Fax Prevention

■ Paper Settings

■ Ring Volume

■ Secure Receive

■ Default Output Options

Are the settings correct?
7 Is the correct phone number being Go to step 8. Enter the correct
used to fax to the printer? number.
8 Print an Activity Report. Go to step 9. Change
Do incoming calls appear on the configuration
report? settings that
could impede
inbound calls.
9 Does the remote Fax answer then fail Reduce the Go to step 10.
to complete the transmission? transmission
Note: The system is set to super G3 speed until the
(33.6kbps) by default. Some phone connection is
lines and older Fax machines do not consistent.
support this speed.
10 Send a test Fax from a local machine. Check the line Replace the FAX
Does the System answer? quality. Board
(page 8-115).
11 Check the following settings: Go to step 12. Modify the
■ Automatic Redial Settings settings.
■ Automatic Resend

■ Audio Line Monitor

■ Send Transmission Header Text

■ Batch Send
Are the settings correct?
12 Check the target Fax number. Go to step 13. Enter the correct
If the number is in memory, is it number.
saved correctly?
13 Does the remote Fax answer then fail Reduce the Go to step 14.
to complete the transmission? transmission
Note: The system is set to super G3 speed until the
(33.6kbps) by default. Some phone connection is
lines and older Fax machines do not established
support this speed.

4-70 WorkCentre 6400 Service Manual

General Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

14 Send a test Fax to a local machine. Go to step 15. Replace the FAX
Does the System answer? Board
(page 8-115).
15 Insert a dialing pause following the Troubleshooting Select a different
external access number that complete. access point and
precedes the Fax number on many retest the
office phone systems. connection.
Does the remote machine ring?

WorkCentre 6400 Service Manual 4-71

General Troubleshooting

Operating System and Application Problems

Verify Settings

1. Verify the settings on the Configuration Report.

■ TCP/IPv4 is set to: Enabled.
■ Automatic Addressing is set to: DHCP, RARP, BOOTP, STATIC, or
DISABLED (depending on your network configuration).
■ If Automatic Addressing is set to DISABLED, verify that IP Address
is set correctly. (Note this address.)
■ Subnet Mask is set correctly.
■ Router Gateway is set correctly.
■ LPR/ LPD and Raw IP Printing is Enabled. Verify that the LPR
settings are set as desired and Raw IP Printing Port Number 1 is set
to 9100 (a.k.a. AppSocket).
2. Verify that the client is logged on to the network and printing to the correct
print queue. The user should also have access to the printer queue.

Windows 2000, Windows XP, Windows Server Troubleshooting

This troubleshooting section assumes you have completed the following

tasks.

■ Loaded a printer PCL or PostScript printer driver.

■ Printed and kept a current copy of the Configuration page.

1. To select Classic Look, click Start, select Control Panel, and select
Taskbar and Start Menu.
2. Select the Start Menu tab and then Classic Start Menu.
3. Click OK.

4-72 WorkCentre 6400 Service Manual

General Troubleshooting

Verify Driver Installation

The following procedures eliminates cabling, communication, and connection

problems. Once you complete these steps, print a test page from your
software application.
1. From the desktop, right-click My Network Places, and select Properties.
2. Right-click Local Area Connection and select Properties.
3. Click the General tab. View the list of installed network protocols to verify
that TCP/IP is installed. (For more information, contact your network
administrator.)
4. Click Install to install any components not listed, and then restart your
computer.
5. From the Start menu, select Start -> Settings -> Printers and Faxes.
6. Right-click the printer icon, and select Properties.
7. Click the Advanced tab. Verify that the correct printer driver is installed.
8. Click the Ports tab. Verify that the IP Address in the Print to the
Following Ports list is identical to the one on the Configuration page. You
may need to click the Configure Port button to see the IP address. If
necessary, re-select the TCP/IP number used for the printer.

Macintosh Troubleshooting (Mac OS 10.3 and Higher)

Macintosh Troubleshooting OS 10.3 Step-by-Step

Perform these steps only for Mac OS 10.3 and higher.

1. Open the Network Utility and click the Ping tab.
2. Enter the printer’s IP address.
3. Click Ping. If you do not get a response, verify that your TCP/IP settings
are correct for your printer and computer.

Note
See also: www.xerox.com/office/WC6400support

WorkCentre 6400 Service Manual 4-73

General Troubleshooting

UNIX/ Linux

This section includes:

■ Quick Install Steps

■ Additional Resources

Your printer supports connection to a variety of UNIX platforms. The

workstations currently supported by CentreWare for UNIX/Linux to a network-
connected printer are:

■ Sun Solaris

■ IBM AIX

■ Hewlett-Packard HP-UX

■ Linux (i386) tested on SUSE 10.0, RedHat 9, Fedora Core1

The following procedures enable you to connect your printer using any of the
supported versions of UNIX or Linux listed above.

Quick Install Steps

Perform the following procedures to set up the printer and install the
appropriate drivers.

From Your Computer

To install the CentreWare for Unix driver:

1. Go to www.xerox.com and click on the Support & Drivers link.
2. Enter 6400 in the Enter product name or number field and click search.
3. Click the Drivers & Downloads link for the WorkCentre 6400.
4. Select your Operating System and Language and click go.
5. Select the appropriate driver in the list, read the End-User License
Agreement and click Accept.
6. Click Save to download the driver package.
7. At root, untar the package.
8. Change directories to the expanded package folder, then follow the
instructions in the readme file to install the driver.
9. Print a test page to verify the installation.

Note
If print-quality problem exists, or your job did not print, refer to the User
Guide at www.xerox.com/office/WC6400support.

4-74 WorkCentre 6400 Service Manual

General Troubleshooting

Additional Resources

For users that want to use the CUPS driver instead of CentreWare for Unix,
access the Xerox web site for the latest CUPS ppd package at
www.xerox.com/office/

Note
The print daemon may need restarting for the print manager to see the
new PPD added to the CUPS ppd directory.

WorkCentre 6400 Service Manual 4-75

General Troubleshooting

4-76 WorkCentre 6400 Service Manual

Print-Quality
Troubleshooting
In this chapter...
■ Print-Quality Problems Overview
■ Checklist Before Troubleshooting Print-Quality
■ Print-Quality Troubleshooting Pages and Test Patterns
■ Print-Quality Specifications
■ Troubleshooting Procedures
■ Print-Quality Troubleshooting
■ Copy/ Scan Troubleshooting
■ Image Specifications

Chapter
5
Print-Quality Troubleshooting

Print-Quality Problems Overview

Print-quality defects can be attributed to printer components, consumables,

paper, internal software, external software applications, and environmental
conditions. To successfully troubleshoot print-quality problems, eliminate as
many variables as possible. The first step is to generate prints using
information pages embedded in the printer on laser paper from the
Recommended Media List (RML). Refer to “Paper and Tray Specifications” on
page 1-33 for supported and specialty paper that have been tested and
approved for use in the WorkCentre 6400. Use paper from a fresh ream that
is acclimated to room temperature and humidity.
If the print-quality defect is still present when printing on approved paper from
a fresh ream, then investigate software applications and environmental
conditions.
Print the Configuration page to determine the temperature and humidity under
which the printer is operating. Compare this to the “Environment
Specifications” on page 1-24. Extreme temperature and humidity can
adversely affect the xerographic and fusing characteristics of the printer.
Print the system status embedded pages to obtain system status information,
printable fault history (last 40 faults) and a suite of test pages to aid in print-
quality troubleshooting.
When analyzing a print-quality defect, first determine if the defect occurs in all
colors or only one color and if it is repeating or random occurrence.
Continuous defects in the process direction, such as Voids and Lines, are the
most difficult to diagnose. Inspect the visible surfaces of all rollers for obvious
defect.

Defects Associated with Printer, DADF, and Scanner Components

Some print-quality problems can be associated with specific assemblies; the

most common problems and the associated assemblies are listed in this
section. Refer to the specific print-quality troubleshooting procedure for detail
information.
If no defects are found, print the repeating defects embedded page to help
identify the consumable or Routine Maintenance Item (RMI) responsible for
the defect.

Toner Cartridge(s)

■ Vertical Bands, Voids, or Streaks in All Colors

■ Uneven Pitch

■ Defects in One Color (C, M, Y, or K)

5-2 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Imaging Unit(s)

■ Vertical Bands, Voids, or Streaks in All Colors

■ Horizontal Bands, Voids, or Streaks

■ Uneven Density in the Feed Direction

■ Uneven Density in the Scan Direction

■ Light Prints

■ Gradation Reproduction Failure

■ Background Contamination
■ Void Areas or White Spots

■ Random Spots

■ Blurred Image

■ Blank Print

■ Black Print

■ Color Registration

Fuser Unit

■ Vertical Bands, Voids, or Streaks in All Colors

■ Horizontal Bands, Voids, or Streaks

■ Random Spots

■ Incomplete Fusing or Cold Offset

■ Residual Image, Ghosting, or Hot Offset

■ Smudges or Smears

■ Smears or Streaks on Back Side of Page

■ Uneven Pitch

■ Damaged Paper

WorkCentre 6400 Service Manual 5-3

Print-Quality Troubleshooting

Transfer Roller

■ Vertical Bands, Voids, or Streaks in All Colors

■ Horizontal Bands, Voids, or Streaks

■ Uneven Density in the Feed Direction

■ Uneven Density in the Scan Direction

■ Void Areas or White Spots

■ Random Spots

■ Smears or Streaks on Back Side of Page

■ Uneven Pitch

Transfer Belt

■ Vertical Bands, Voids, or Streaks in All Colors

■ Horizontal Bands, Voids, or Streaks

■ Uneven Density in the Feed Direction

■ Uneven Density in the Scan Direction

■ Light Prints

■ Poor Color Reproduction

■ Void Areas or White Spots

■ Random Spots

■ Color Registration

■ Smears or Streaks on Back Side of Page

■ Uneven Pitch

■ Skew

■ Damaged Paper

5-4 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Laser Unit

■ Vertical Bands, Voids, or Streaks in All Colors

■ Uneven Density in the Feed Direction

■ Light Prints

■ Gradation Reproduction Failure

■ Background Contamination

■ Blurred Image

■ Blank Print
■ Black Print

■ Color Registration

■ Defects in One Color (C, M, Y, or K)

DADF/ Scanner

■ Skew

■ Damaged Paper

■ Wavy Lines

■ Spots Present in Copies

WorkCentre 6400 Service Manual 5-5

Print-Quality Troubleshooting

Checklist Before Troubleshooting Print-Quality

Checking the Printer Condition

Toner

Low toner can cause print-quality problems, such as Fading, Streaking, White
Lines, or Dropouts. Print a small document from different software
applications to replicate the problem and check the amount of toner available.
Check the toner level using the Machine Status -> Supplies tab. Print a
Supplies Report page.
If the toner is low, replace the affected Toner Cartridge.

Cleaning

Paper, toner, and dust particles can accumulate inside the printer and cause
print-quality problems such as Smearing or Toner Specks. Clean the inside of
the printer to prevent these problems.

Calibration

Perform the Image Quality Calibration routine (page 6-21) or dc936

(page 6-13) and confirm the defect is still present.

CRU Installation

Fully remove all four Toner Cartridges and Imaging Units from the printer. Re-
install the Toner Cartridges and Imaging Units one at a time starting with the
Imaging Units, and ensure all are correctly locked in place.

5-6 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Checklist

Check the following items prior to performing troubleshooting. These

procedures may help to resolve the problems without troubleshooting the
printer.
1. Color is out of alignment.
a. Clean the Laser Unit lenses using the Laser Lense Cleaning Tool.
b. Perform “dc936 - Image Quality Calibration” on page 6-13.
c. Check the Transfer Belt for damage.

Color Registration

2. Print is too light.

a. The toner level may be too low. Check the amount of toner in each
Toner Cartridge and change the Cartridge(s) if necessary.
b. Confirm the Paper Type settings are correct for the paper being used.
c. Verify that the paper being used is supported by this product.

Light or Undertone Print

WorkCentre 6400 Service Manual 5-7

Print-Quality Troubleshooting

3. Toner smears or print comes off page.

a. If you are printing on a thick or an rough paper, change the Paper
Type settings using the Machine Status ->Tools -> Device Settings
-> Paper Management -> Tray Contents.
b. Verify that the paper is within the printer specifications (refer to “Paper
and Tray Specifications” on page 1-33.
c. Make sure the Gray dials on the Fuser are set to the correct setting
(Paper or Envelope).

Smudges or Smears

4. Toner spots appear on the page and printing is blurred.

a. Check the Toner Cartridge(s) to make sure that they are installed
correctly.
b. Change the Toner Cartridge(s).

Random Spots

5-8 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

5. Entire page is white or one color is missing from color image.

a. Ensure the shipping restraints have been completely removed from
each Toner Cartridge.
b. Check the Toner Cartridge(s) to make sure that they are installed
correctly.
c. The toner level may be low. Change the affected Toner Cartridge.

Blank Print

6. Streaks appear on the page.

a. The toner may be low. Change the affected Toner Cartridge(s).
b. If you are using preprinted forms, make sure the toner can withstand
the operating temperature of 0° C to 35° C.

Horizontal Band, Void, or Streaks

WorkCentre 6400 Service Manual 5-9

Print-Quality Troubleshooting

7. Characters have jagged or uneven edges.

a. If you are using downloaded fonts, verify that the fonts are supported
by the printer, the host computer, and the software application.
b. From the Start menu, go to Settings -> Printers and Faxes.
c. Select Xerox WorkCentre 6400X/F. Right-click on the printer icon
and select Printing Preferences.
d. Verify that you’re at the Paper/Output screen. Under Print Quality,
select Standard. Click OK.

nthemum
nthemum xx

Chrysanthemum x morifolium

nthemum x anthemum
h
Fuzzy Text

8. Part or all the page prints in cyan, magenta, yellow, or black.

Check the Toner Cartridges to make sure they are installed correctly.

Fast Scan 8 Tone

5-10 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

9. The job prints, but the top and side margins are incorrect.
a. Ensure the Paper Size settings in the Tray Settings Menu are correct.
b. Ensure the margins are set correctly in the software application.
c. Perform internal test prints (i.e., printer’s Demo Page, service
diagnostics Test Prints, etc.,) and evaluate the prints.
d. Perform the Image Position Calibration (page 6-20) to adjust the
margins.

Image Not Centered

10. Printing on transparencies is faded.

This occurs when the printer is operating at a location where relative
humidity reaches 85° or more.
Adjust the humidity or relocate the printer to an appropriate environment.

Light Print on Transparency

WorkCentre 6400 Service Manual 5-11

Print-Quality Troubleshooting

Print-Quality Troubleshooting Pages and Test Patterns

A variety of test prints are available from the customer menu and service
diagnostics to aid in determining the quality of output from the printer to assist
in troubleshooting problems.

Accessing Troubleshooting Print-Quality Pages

The Troubleshooting Print-Quality Pages can be access through the

Customer Menu.
1. Press the Machine Status button.
2. Select Tools.
3. Select Troubleshooting.
4. Select Support Pages.
5. Select the appropriate Test Print page to be printed.

Troubleshooting Print-Quality Pages

Customer Service
Item Description
Menu Diagnostics

1 Troubleshooting Print Quality Page X N/A

2 Repeating Defects Page X N/A
3 Service Usage Profile X N/A
4 System Status Page/Fault History X N/A
5 Cyan 50% Fill Test Page X X
6 Magenta 50% Fill Test Page X X
7 Yellow 50% Fill Test Page X X
8 Black 50% Fill Test Page X X
9 Manufacturing Test Page 1 X X
10 Manufacturing Test Page 2 X X
11 Manufacturing Test Page 3 X X

5-12 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Print Test Patterns (dc612)

The Print Test Patterns can be accessed through the Customer Menu or
Service Diagnostics.

Print Test Patterns

Customer Service
Item Description
Menu Diagnostics

1 Cyan 50% Fill X X

2 Magenta 50% Fill X X
3 Yellow 50% Fill X X
4 Black 50% Fill X X
5 Registration Print (Manufacturing Test Page 1) X X
6 Delta-E Print (Manufacturing Test Page 2) X X
7 Ghosting Print (Manufacturing Test Page 3) X X

Accessing Print Test Patterns through Service Diagnostics

1. Press and hold the “*” the + “#” the + “Stop” buttons.
2. On the Login screen on the Control Panel, enter “6789” and select Enter.
3. Select Diagnostics tab.
4. From the Diagnostic Routines menu, select dc612 Print Test Pattern.
5. Select the Test Pattern to be printed.

Cyan 50% Fill

This test print provides 50% cyan fill coverage within printable margins. Use
this test print to isolate defects to this specific color. Inspect the Toner
Cartridge and Imaging Unit of the affected color. Replace the Toner Cartridge
or Imaging Unit as needed.

Cyan 50%

WorkCentre 6400 Service Manual 5-13

Print-Quality Troubleshooting

Magenta 50% Fill

This test print provides 50% magenta fill coverage within printable margins.
Use this test print to isolate defects to this specific color. Inspect the Toner
Cartridge and Imaging Unit of the affected color. Replace the Toner Cartridge
or Imaging Unit as needed.

Magenta 50%

Yellow 50% Fill

This test print provides 50% yellow fill coverage within printable margins. Use
this test print to isolate defects to this specific color. Inspect the Toner
Cartridge and Imaging Unit of the affected color. Replace the Toner Cartridge
or Imaging Unit as needed.

Yellow 50%

5-14 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Black 50% Fill

This test print provides 50% black fill coverage within printable margins. Use
this test print to isolate defects to this specific color. Inspect the Toner
Cartridge and Imaging Unit of the affected color. Replace the Toner Cartridge
or Imaging Unit as needed.

Black 50%

Manufacturing Test Page 1/ Registration Print

This test print is used to verify image registration.

2002.5.16
Product: WC6400
2 dot
2dot
Serial No: No Serial Number
Pagecount=7
File name:n3reg.ps (V3.0)

N3Reg-v3

WorkCentre 6400 Service Manual 5-15

Print-Quality Troubleshooting

Manufacturing Test 2/ Delta-E Print

This test print is used to evaluate color reproduction variations.

Serial No: ; Page Number: Copyright 2008, Xerox Corp. WC6400MFP ver 2.0
ctl file: deltaE.ps
product: page: 1
Printer Name: XRX_0000AA934ADD
Resolution: 1200 x 600
Values/color: 2 (1 bit)
VirtualColorDevice: CMYK

s6400mfp-859

Manufacturing Test 3/ Ghosting Print

This test print is used to determine the presence of residual images.

A A A A A A A A A A A A
A A A A A A A A A A A A
A A A A A A A A A A A A
A A A A A A A A A A A A

20%/20%/20% 60%/60%/60% 80%/80%/80% 20% 60% 100% 20% 60% 100% 20% 60% 100%

Ghosting SEF

5-16 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Print-Quality Troubleshooting Pages

The Print-Quality Troubleshooting pages contain information regarding feature

and potential solutions for eliminating the problems.

Troubleshooting Print-Quality

The Print-Quality Troubleshooting pages contain examples of common print

defects (i.e., streaks, mis-registration, etc...) and potential solutions for
resolving the problems.

Repeating Defects

The Repeating Defects page contains rulers indicating the distance between
repeating defects which correspond to a specific device component.

To identify the component causing

the defect, compare your print sample
against the measurements shown.
37.7 mm / 1.48 in.
69.7 mm / 2.74 in.

58.1 mm / 2.29 in.

94.2 mm / 3.72 in.

40.2 mm / 1.58 in.

34.4 mm / 1.35 in.

157 mm / 6.18 in.
25.1 mm / .99 in.

94.2 mm / 3.7 in.

27.9 mm / 1 in.

Transfer Belt Transfer Roller Fuser Exit Roller Imaging Unit

6400mfp Repeating Defects

WorkCentre 6400 Service Manual 5-17

Print-Quality Troubleshooting

Service Usage Profile

The Service Usage Profile contains information for tracking usage and
reliability data using tokens that are stored on the device.

Note
Line 1 - Values Collected: Represents the date and time the values listed
in the report were obtained: The date information appear in this format
YYYYMMDDHHMMSS.

Example: 20080620013030 reflects June 20, 2008 01:30:30

5-18 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

System Status/ Fault History

The System Status/ Fault History page is a 7 page document.

■ Page 1 - System Status: Contains usage counters, current temperature

and humidity information.

WorkCentre 6400 Service Manual 5-19

Print-Quality Troubleshooting

■ Page 2 - Fault History: Contains the most recent faults that have occurred.

Note
The Image Count (Machine Status -> Faults -> Fault History) is the
Total images between service calls, not total impressions.

■ Page 3 - Cyan 50% Fill Page: Provides 50% cyan fill coverage within
printable margins.

■ Page 4 - Magenta 50% Fill Page: Provides 50% magenta fill coverage
within printable margins.

■ Page 5 - Yellow 50% Fill Page: Provides 50% yellow fill coverage within
printable margins.

■ Page 6 - Black 50% Fill Page: Provides 50% black fill coverage within
printable margins.

■ Page 7 - Manufacturing Test Page 2: Contains test patterns for evaluating

color reproduction variations.

■ Page 8 - Manufacturing Test Page 1: Contains test patterns for verifying

image registration.

■ Page 9 - Manufacturing Test Page 3: Contains test patterns for

determining the presence of residue images.

5-20 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Print-Quality Specifications

The Print-Quality specifications are provided as follows.

Note
Print-Quality can only be guaranteed when Genuine Xerox Supplies are
used in the printer.

Environmental Condition

■ Temperature: 10° C - 32° C (50° F - 90° F)

■ Humidity: 15% - 80% Relative Humidity

Note
For optimum product performance, a constant environment with a
temperature range between 15° C - 25° C (59° F - 77° F) and a humidity
range between 35% - 70% should be maintained.

Defects may occur due to condensation after around 30 minutes if the

printer is turned On in a critical environment such as 85% at 10° C
(50° F).

Quality Paper

Print-Quality and printer performance is guaranteed when papers listed on the

Recommended Media List (RML) are used. Print-Quality and printer
performance can vary, and is not guaranteed when other papers are used.

Paper Storage and Condition

Paper used should be fresh and stored in the operating environment for 12
hours before use for printing.

Printer Condition

The specified print-quality is guaranteed with the printer in specified

environmental conditions and when installation guidelines are followed. The
printer should be installed on a flat, stable, level surface and clearance
specification must be adhered to.

WorkCentre 6400 Service Manual 5-21

Print-Quality Troubleshooting

Troubleshooting Procedures

Print-Quality and Copy/ Scan Defect Definitions

The following table lists the print-quality defect corrective procedure, their
definition, and the page where each procedure is provided.

Defect Definition Page

Print-Quality Troubleshooting
Vertical Bands, There are faded or completely non-printed lines page 5-26
Voids, or Streaks in along the page in the direction of the paper travel
All Colors from the leading edge to the trailing edge.
Horizontal Bands, There are areas of the image that are extremely page 5-28
Voids, or Streaks light or are missing entirely.
Uneven Density in The density of the print along the length of the page 5-30
the Feed Direction copy is print is inconsistent.
Uneven Density in The density of the print along the width of the page 5-32
the Scan Direction print is inconsistent.
Light Prints The overall image density is too light in all colors. page 5-34
Gradation The overall image becomes less and less clear page 5-36
Reproduction Failure with each print.
Background There is toner contamination on all or most of the page 5-38
Contamination page.
Poor Color The colors in the print is not a good reproduction page 5-40
Reproduction of the original.
Void Areas or White Missing spots or areas on the print. page 5-42
Spots
Random Spots There are spots of toner randomly scattered page 5-44
across the page.
Blurred Image The overall image density is blurry. page 5-45
Blank Print The entire image area is blank. page 5-46
Black Print The entire image is black. page 5-48
Color Registration A printed yellow or black image is not overlapped page 5-50
on a cyan or magenta image correctly.
Incomplete Fusing The toner image is not completely fused to the page 5-52
or Cold Offset paper. The image easily rubs off.
Residual Image, There are faint, ghostly images appearing on the page 5-53
Ghosting, or Hot page. The images may be either from a previous
Offset page or from the page currently being printed.
Smudges or Smears The image on the print appears blurry or page 5-55
smeared.

5-22 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Defect Definition Page

Smears or Streaks The print contains markings on the back side of page 5-56
on Back Side of the image.
Page
Uneven Pitch The pitch along the scan direction is uneven or page 5-58
inconsistent.
Defects in One Color Only one color (Cyan, Magenta, Yellow, or Black) page 5-60
(C, M, Y, or K) is too light on the printed image.
Skew The printed image is not parallel with both sides page 5-62
of the paper.
Damaged Paper Paper comes out from the printer wrinkled, page 5-64
folded, or worn-out.

Copy/ Scan Troubleshooting

Lines, Spots, The image on the copy appears blurry or page 5-66
Streaks & Smears smeared.
Background Color, The image on the copy appears too light, too page 5-68
Text, and Images on dark, or blurry.
Copies are Too
Light, Too Dark, or
Blurry
Skew The printed image is not parallel with both sides page 5-69
of the paper.
Damaged Paper Paper comes out from the printer wrinkled, page 5-71
folded, or worn-out.
Wavy Lines The printed image has wavy column line in the page 5-72
direction of the paper travel.
Spots Present in There are spots in copies when scanning page 5-74
Copies document on the Document Glass.
Image Does Not There is no image on the page. page 5-75
Appear
Large Jitter The carrier generates jitter while moving from the page 5-76
home position.
Image Mis- The composite color image may be misaligned or page 5-77
registered present an incorrect color scheme.
Image Unclear Image on the paper is not clear. page 5-79

WorkCentre 6400 Service Manual 5-23

Print-Quality Troubleshooting

Repeating Defect Measurement

Repeating Defects can be attributed to specific components within the printer.

Match a set of repeating defects in the print to the table below in order to
identify the source of the defect.
All of the repeating defects should be visible on one piece of paper with the
exception of item number 2. Due to the length of the Transfer Belt, this
repeating defect may only be visible on every other page.

Horizontal Line and Spot Trouble Measurement

Distance Between Part List

Item Component Defects Assembly Number

1 Drive Roller 69.7 mm (2.74 in.) Transfer Belt PL14.16

2 Transfer Belt 696.9 mm (27.4 in.) Transfer Belt PL14.16
3 1st Transfer 25.1 mm (.99 in.) Transfer Belt PL14.16
Roller
4 2nd Transfer 58.1 mm (2.29 in.) Transfer Roller PL16.20
Roller
5 Fuser Belt 157.0 mm (6.18 in.) Fuser Unit PL18.1
6 Fuser Backup 94.2 mm (3.72 in.) Fuser Unit PL18.1
Roller
7 Exit Roller 37.7 mm (1.48 in.) Paper Exit Assembly PL19.25
8 Photo Conductor 94.2 mm (3.7 in.) Imaging Unit PL6.23-6.26
(C/M/Y/K)
9 Developing See the “Roller Imaging Unit PL6.23-6.26
Roller Measurement” on (C/M/Y/K)
page 5-25
10 Supply Roller See the “Roller Imaging Unit PL6.23-6.26
Measurement” on (C/M/Y/K)
page 5-25

Repeating Defect Component Locations

7
6

4
3
2
8 9
10 s6400mfp-910

5-24 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Roller Measurement

The Developing Rollers and Supply Rollers defect are dependent on the
engine speed.

Engine Speed 216 mm/s 185 mm/s 76 mm/s 61.7 mm/s

Developing Roller 40.2 mm 34.4 mm 34.4 mm 27.9 mm

(CMYK)
Supply Roller 35.6 mm 30.5 mm 30.5 mm 24.8 mm
(CMYK)

WorkCentre 6400 Service Manual 5-25

Print-Quality Troubleshooting

Vertical Bands, Voids, or Streaks in All Colors

There are areas of the Image that are extremely light or missing entirely.
These missing areas form bands that run along the paper from the leading
edge to the trailing edge, in the direction of paper travel.

Initial Actions

■ Print the CMYK 50% Fill Pages and attempt to isolate the defect to a
specific color. Troubleshoot the affected color.

■ Check the paper path is clean and free of paper dust and debris.

■ Carefully inspect and clean each Laser window.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ Fuser Unit, PL18.01

Vertical Blank Lines

Caution
Make sure the Imaging Units are not exposed to direct light for more than
a few minutes to avoid damaging the OPC Drum.

Warning
Wait for the Fuser to cool before starting the procedure.

5-26 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Remove each Imaging Unit, one at a Remove any Go to step 2.

time, and inspect the OPC Drums and obstructions or
corresponding area. debris.
Remove any debris such as hair, foam
or paper.
2 Are there scratches or other damage Replace the Go to step 3.
evident on the OPC Drums? Imaging Unit
(page 8-17).
3 Are the Developer Bias contact Reposition the Go to step 4.
terminals (on the rear of each Imaging contacts or
Unit) bent or out of position? replace the
Imaging unit
(page 8-17).
4 Is the Transfer Roller dirty or Replace the Go to step 5.
damaged? Transfer Roller
(page 8-23).
5 Is the Entrance Guide Plate or the Clean or replace Go to step 6.
Separator Fingers on the Fuser Unit the Fuser Unit
dirty or damaged? (page 8-24).
6 Is the Transfer Belt dirty (finger Replace the Go to step 7.
printers, oil, etc.) or scratched? Transfer Belt
(page 8-20).
7 Are the window surfaces of the Laser Thoroughly Replace the
Unit dirty? clean each Laser Laser Unit
window. (page 8-126).

WorkCentre 6400 Service Manual 5-27

Print-Quality Troubleshooting

Horizontal Bands, Voids, or Streaks

There are areas of the Image that are extremely light or missing entirely.
These missing areas form bands that run along the paper from one side
toward the other.

Initial Actions

■ Print the CMYK 50% Fill Pages and attempt to isolate the defect to a
specific color. Troubleshoot the affected color.

■ Confirm that the paper used is supported by this printer.

■ Check the paper path is clean and free of paper dust and debris.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ LVPS, PL10.17
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ Fuser Unit, PL18.01

Horizontal Band, Void, or Streaks

Caution
Make sure the Imaging Units are not exposed to direct light for more than
a few minutes to avoid damaging the OPC Drum.

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the paper wrinkled or dimpled? Troubleshooting Go to step 2.

Is the problem resolved by loading complete.
fresh, dry paper?

5-28 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 Remove each Imaging Unit, one at a Remove any Go to step 3.
time, and inspect the OPC Drums and obstructions or
corresponding area. debris.
Remove any debris such as hair, foam
or paper.
3 Are there scratches or other damage Replace the Go to step 4.
evident on the OPC Drums? Imaging Unit
(page 8-17).
4 Are the Developer Bias contact Reposition the Go to step 5.
terminals (on the rear of each Imaging contacts or
Unit) bent or out of position? replace the
Imaging Unit
(page 8-17)
5 Is the Transfer Roller dirty or Replace the Go to step 6.
damaged? Transfer Roller
(page 8-23).
6 Is the Entrance Guide Plate or the Clean or replace Go to step 7.
Separator Fingers on the Fuser Unit the Fuser Unit
dirty or damaged? (page 8-24).
7 Is the Transfer Belt dirty (finger Replace the Replace the
printers, oil, etc.) or scratched? Transfer Belt LVPS
(page 8-20). (page 8-82).

WorkCentre 6400 Service Manual 5-29

Print-Quality Troubleshooting

Uneven Density in the Feed Direction

The density of the print image along the length of the page is inconsistent or
uneven.

Initial Actions

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

■ Perform the Image Quality Calibration routine (page 6-21).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Color Uneven or Wrong (Scan Direction)

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the printer being operated at high Perform “dc960 Go to step 2.
altitude? - Altitude
Adjustment” on
page 6-14, then
perform “Image
Quality
Calibration” on
page 6-21.
Go to step 2.
2 Check the Imaging Units and Transfer Reinstall or Go to step 3.
Roller for correct installation, damage, replace the
contamination and life remaining. affected
component.

5-30 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Is the Transfer Belt dirty or scratched? Replace the Go to step 4.
Transfer Belt
(page 8-20).
4 Check the Laser Unit. Clean the Laser Go to step 5.
Are the Laser Unit lenses dirty? Unit lenses.
5 Replace the Laser Unit (page 8-126). Replace the Troubleshooting
Does the error still occur? HVPS-1 complete.
(page 8-106).
Go to step 6.
6 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-31

Print-Quality Troubleshooting

Uneven Density in the Scan Direction

The density of the image along the width of the page is inconsistent or
uneven.

Initial Actions

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

■ Perform the Image Quality Calibration routine (page 6-21).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Color Uneven or Wrong (Process Direction)

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the printer being operated at high Perform “dc960 Go to step 2.

altitude? - Altitude
Adjustment” on
page 6-14, then
perform “Image
Quality
Calibration” on
page 6-21.
Go to step 2.
2 Check the Imaging Units and Transfer Reinstall or Go to step 3.
Roller for correct installation, damage, replace the
contamination and life remaining. affected
component.

5-32 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Are the Transfer Belt contacts Go to step 4. Clean or replace
(PL14.18, 26) and Plate Spring the contacts.
(PL14.28) in good contact with the
mating parts on the Transfer Belt?
4 Is the Transfer Belt dirty or scratched? Replace the Replace the
Transfer Belt HVPS-1
(page 8-20). (page 8-106).
Go to step 5.
5 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-33

Print-Quality Troubleshooting

Light Prints

The overall image density is too light in all colors.

Initial Actions

■ Check the paper path is clean and free of paper dust and debris.
■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26
■ Laser Unit, PL10.11
■ Image Density Control Board,
PL14.13
■ Transfer Belt, PL14.16
■ Image Processor Board, PL20.07
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Light or Undertone Print

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the printer being operated in a dry Perform “dc936 Go to step 3.

or humid environment? - Image Quality
Calibration” on
page 6-13.
Go to step 2.
2 Does the error still occur? Perform “dc909 Troubleshooting
- Calibrate for complete.
Paper Type” on
page 6-12.
3 Check the paper condition. Go to step 4. Replace or
Is the paper dry, recommended type, reload the
and loaded correctly in the tray? paper.
4 Check the Imaging Units and Transfer Reinstall or Go to step 5.
Roller for correct installation, damage, replace the
contamination and life remaining. affected
component.

5-34 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the Transfer Belt dirty or scratched? Replace the Go to step 6.
Transfer Belt
(page 8-20).
If the problem
persists, go to
step 6.
6 Are the Transfer Belt contacts Go to step 7. Clean or correct
(PL14.18, 26) and Plate Spring the contacts.
(PL14.28) in good contact with the
mating parts on the Transfer Belt?
7 Check the Laser Unit. Clean the Laser Replace the
Are the Laser Unit lenses dirty? Unit lenses. Laser Unit
Go to step 9. (page 8-126).
Go to step 8.
8 Check the Front and Rear IDC Sensors Clean the Front Go to step 9.
(PL14.13). and Rear
Are the Sensors dirty? Sensors.
9 Does the error still occur? Replace the Troubleshooting
Image complete.
Processor Board
(page 8-98).
Go to step 10.
10 Does the error still occur? Replace the IDC Troubleshooting
Sensor complete.
(page 8-87).
Go to step 11.
11 Does the error still occur? Replace the Troubleshooting
HVPS-1 complete.
(page 8-106).
Go to step 12.
12 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-35

Print-Quality Troubleshooting

Gradation Reproduction Failure

The overall image becomes less and less clear with each print.

Initial Actions

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

■ Perform the Image Quality Calibration routine (page 6-21).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26
■ Laser Unit, PL10.11
■ Image Density Control Board,
PL14.13
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Gradation Reproduction Failure/Fading Copies

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are there scratches on the Photo Replace the Go to step 2.

Conductor’s surface? Imaging Unit
Inspect each Photo Conductor Drum. (page 8-17).
Are any of the Drums scratched or
damaged?
2 Check the Laser Unit. Clean the Laser Replace the
Are the Laser Unit lenses dirty? Unit lenses. Laser Unit
Go to step 3. (page 8-126).
Go to step 4.
3 Check the Front and Rear IDC Sensors Clean the Go to step 4.
(PL14.03). Sensors.
Are the Sensors dirty?

5-36 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the error still occur? Replace the IDC Troubleshooting
Sensor Boards complete.
(page 8-87).
Go to step 5.
5 Does the error still occur? Replace the Troubleshooting
HVPS-1 complete.
(page 8-106).
Go to step 6.
6 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-37

Print-Quality Troubleshooting

Background Contamination

There is toner contamination on all or most of the page. The contamination

appears as a very light gray dusting.

Initial Actions

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

■ Verify humidity. Optimum printing range is 25~45%.

■ Perform the Image Quality Calibration routine (page 6-21).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Image Density Control Board,
PL14.13

Background Contamination

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Is the printer being operated in a dry Perform “Image Go to step 3.

or humid environment? Quality
Calibration” on
page 6-21.
Go to step 2.
2 Does the error still occur? Perform “dc909 Troubleshooting
- Calibrate for complete.
Paper Type” on
page 6-12.

5-38 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Are the Developer Bias contact Reposition the Go to step 4.
terminals (on the rear of each Imaging contacts or
Units) bent or out of position? replace the
affected Imaging
Unit
(page 8-17).
4 Inspect each Photo Conductor Drum. Replace the Go to step 5.
Are any of the Drums scratched or Imaging Unit
damaged? (page 8-17).
5 Check the Laser Unit. Clean the Laser Go to step 6.
Are the Laser Unit lenses dirty? Unit lenses.
6 Check the Front and Rear IDC Sensors. Clean the Front Replace the IDC
Are the Sensors dirty? and Rear Sensor
Sensors. (page 8-87).
Go to step 7.
7 Does the error still occur? Replace the Troubleshooting
Laser Unit complete.
(page 8-126).

WorkCentre 6400 Service Manual 5-39

Print-Quality Troubleshooting

Poor Color Reproduction

The colors in the print is not a good reproduction of the original.

Initial Actions

■ Check the paper path is clean and free of paper dust and debris.
■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

■ Perform the Image Quality Calibration routine (page 6-21) prior to

troubleshooting.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Image Density
Control Board,
PL14.13
■ Transfer Belt,
PL14.16
■ Image Processor
Board, PL20.07
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Unexpected Colors

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the

Is the paper dry, recommended type, paper.
and loaded correctly in the tray?
2 Check the Transfer Belt. Replace the Go to step 3.
Is the Transfer Belt dirty? Transfer Belt
(page 8-20).
3 Check the Front and Rear IDC Sensors. Clean the Go to step 4.
Are the Sensors dirty? Sensors.
Go to step 4.
4 Does the error still occur? Replace the IDC Troubleshooting
Sensor complete.
(page 8-87).
Go to step 5.

5-40 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Does the error still occur? Replace the Troubleshooting
Image Process complete.
Board
(page 8-98).
Go to step 6.
6 Does the error still occur? Replace the Troubleshooting
HVPS-1 complete.
(page 8-106).
Go to step 7.
7 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-41

Print-Quality Troubleshooting

Void Areas or White Spots

Missing spots or areas on the print.

Initial Actions

■ Print a Repeating Defects page to help isolate the problem.

■ Check the paper path is free of paper dust and debris.

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20

Repeating Defects

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the type of paper. Perform “Image Go to step 3.

Is thick or special paper being used? Quality
Calibration” on
page 6-21.
Go to step 2.
2 Does the error still occur? Perform “dc909 Troubleshooting
- Calibrate for complete.
Paper Type” on
page 6-12.
3 Inspect each Photo Conductor Drum. Replace the Go to step 4.
Are any of the Drums scratched or Imaging Unit
damaged? (page 8-17).

5-42 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Is the Transfer Roller dirty or Replace the Go to step 5.
damaged? Transfer Roller
(page 8-23).
5 Are the Transfer Belt Contacts Replace the Clean or correct
(PL14.18, PL14.26) and Plate Spring Transfer Belt the contacts.
(PL14.28) in good contact with the (page 8-20).
matting parts on the Transfer Belt)?

WorkCentre 6400 Service Manual 5-43

Print-Quality Troubleshooting

Random Spots

There are spots of toner randomly scattered across the page.

Initial Actions

■ Check the paper path is free of paper dust and debris.

■ Ensure there is no debris in the transfer path.

■ Perform the Image Quality Calibration routine (page 6-21).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ Fuser Unit, PL18.01

Random Spots

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Are there scratches on the Photo Replace the Go to step 2.

Conductor’s surface? Imaging Unit
(page 8-17).
2 Is the Transfer Roller dirty or Replace the Go to step 3.
damaged? Transfer Roller
(page 8-23).
3 Check the Fuser Unit. Replace the Replace the
Is the Fusing Roller dirty or damaged? Fuser Unit Transfer Belt
(page 8-24). (page 8-20).

5-44 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Blurred Image

The image or text appears blurry on the page.

Initial Actions

■ Verify the paper used is supported by the printer.

■ Verify the paper settings are correct at the Control Panel.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11

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nthemum xx

Chrysanthemum x morifolium

nthemum x anthemum
h
Fuzzy Text

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Inspect each Photo Conductor Drum. Replace the Go to step 2.

Are any of the drums scratched or affected Imaging
damaged? Unit
(page 8-17).
2 Check the Laser Unit. Clean the Laser Replace the
Are the Laser Unit lenses dirty? Unit lenses. Laser Unit
(page 8-126).

WorkCentre 6400 Service Manual 5-45

Print-Quality Troubleshooting

Blank Print

The entire image area is blank.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Image Processor Board, PL20.07
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Blank Print

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Print an embedded page. Go to step 2. Check driver

Is the print out blank? settings and
software
application.
2 Check each Imaging Unit Drive Gear. Go to step 3. Re-align the
Is the white Drive Gear in the rear of Drive Gear.
the Imaging Unit installed correctly If the problem
and free of damage? persists, go to
step 4.
3 Is the charge corona voltage contact Go to step 4. Check, clean, or
or Photo Conductor ground contact on correct the
the rear of each Imaging Unit installed contacts.
correctly and free of damage? If the problem
persists, go to
step 5.

5-46 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Check the Laser Unit wiring harness Go to step 5. Reconnect the
connectors (PJ22MCU, PJ23MCU, wiring harness
and PJ901IPB). connectors.
Are the wiring harness connectors
securely connected?
5 Check the HVPS-1 wiring harness Replace the Reconnect the
connectors (PJ17MCU to CN1HV1). HVPS-1 wiring harness
Are the wiring harness connectors (page 8-106). connectors.
securely connected? If the problem
persists, go to
step 6.
6 Check the HVPS-2 wiring harness Replace the Reconnect the
connectors (PJ18MCU to CN1HV2). HVPS-2 wiring harness
Are the wiring harness connectors (page 8-109). connectors.
securely connected? If the problem
persists, go to
step 7.
7 Check the Image Processor Board Replace the Replace the
wiring ribbon harness connectors. Image Laser Unit
Are the wiring harness connectors Processor Board (page 8-126).
securely connected and locked in (page 8-98).
place?

WorkCentre 6400 Service Manual 5-47

Print-Quality Troubleshooting

Black Print

The entire image is black.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Image Processor Board, PL20.07
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Black Print

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Print an embedded page. Go to step 2. Check driver

Is the print out black? settings and
software
application.
2 Check each Imaging Unit Drive Gear. Go to step 3. Re-align the
Is the white Drive Gear in the rear of Drive Gear.
the Imaging Unit installed correctly If the problem
and free of damage? persists, go to
step 4.
3 Is the charge corona voltage contact Go to step 4. Check, clean, or
or Photo Conductor ground contact on correct the
the rear of each Imaging Unit installed contacts.
correctly and free of damage? If the problem
persists, go to
step 5.

5-48 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

WorkCentre 6400 Service Manual 5-49

Print-Quality Troubleshooting

Color Registration

The four colors (Yellow, Black, Cyan, and Magenta) of the image are not
registered correctly into one image.

Initial Actions

■ Check the paper path is free of dust and debris.

■ Ensure there is no debris in the transfer path.

■ Perform the Image Quality Calibration routine (page 6-21) prior to

troubleshooting.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Imaging Unit, PL6.23-26

■ Laser Unit, PL10.11
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20
■ Image Processor Board, PL20.07

Color Registration

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check each Imaging Unit for correct Troubleshooting Go to step 2.

installation. complete.
Remove and reseat the Imaging Unit
(page 8-17).
Does the image quality improve?
2 Check the Photo Conductor Drum of Replace the Go to step 3.
each Imaging Unit. affected Imaging
Is the Drum scratched or damaged? Unit
(page 8-17).
3 Check the Transfer Roller. Replace the Go to step 4.
Is the Transfer Roller dirty or Transfer Roller
damaged? (page 8-23).

5-50 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Are there scratches on the Transfer Replace the Replace the
Belt? Transfer Belt Image
(page 8-20). Processor
Board
(page 8-98).
Go to step 5.
5 Does the error still occur? Replace the Troubleshooting
Laser Unit complete.
(page 8-126).

WorkCentre 6400 Service Manual 5-51

Print-Quality Troubleshooting

Incomplete Fusing or Cold Offset

The toner image is not completely fused to the paper. The image easily rubs
off.

Initial Actions

■ Check the paper path is free of paper, dust and debris.

■ Ensure the gray dials on the Fuser Unit are set to the correct position
(Paper or Envelope).

■ Verify the paper is within the printer specifications (refer to “Paper and
Tray Specifications” on page 1-33).

Troubleshooting Reference Table

Applicable Parts Example Print

■ LVPS, PL10.17
■ Fuser Unit, PL18.01
■ MCU Board, PL20.09

Unfused Image

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the

Is the paper dry, recommended type, paper.
and loaded correctly in the tray?
2 Replace the Fuser Unit (page 8-24). Go to step 3. Troubleshooting
Does the error still occur? complete.
3 Does the error still occur? Replace the Troubleshooting
MCU Board complete.
(page 8-101).
Go to step 4.
4 Does the error still occur? Replace the Troubleshooting
LVPS complete.
(page 8-82)

5-52 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Residual Image, Ghosting, or Hot Offset

There are faint, ghostly images appearing on the page. The images may be
either from a previous page or from the page currently being printed.

Initial Actions

■ Check the Waste Cartridge is correctly installed

■ Check the paper path is free of paper, dust and debris.

■ Verify the paper is within the printer specifications (refer to “Paper and
Tray Specifications” on page 1-33).

■ Try printing with fresh media from a recently opened ream.

Troubleshooting Reference Table

Applicable Parts Example Print

■ LVPS, PL10.17
■ Transfer Roller, PL16.20
■ Fuser Unit, PL18.1
■ MCU Board, PL20.09

Residual Image/Ghosting

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the
Is the paper dry, recommended type, paper.
and loaded correctly in the tray?
2 Replace the Fuser Unit (page 8-24). Go to step 3. Troubleshooting
Does the error still occur? complete.
3 Does the error still occur? Replace the Troubleshooting
Transfer Roller complete.
(page 8-23).
Go to step 4.

WorkCentre 6400 Service Manual 5-53

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

4 Does the error still occur? Replace the Troubleshooting
MCU Board complete.
(page 8-101).
Go to step 5.
5 Does the error still occur? Replace the Troubleshooting
LVPS complete.
(page 8-82).

5-54 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Smudges or Smears

The image on the print appears blurry or smeared.

Initial Actions

■ Check the paper path is free of paper, dust and debris.

■ Check the Waste Cartridge is correctly installed.

■ Ensure the gray dials on the Fuser Unit are set to the correct position
(Paper or Envelope).

Troubleshooting Reference Table

Applicable Parts Example Print

■ Fuser Unit, PL18.01

Ink Smears Duplex

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the

Is the paper dry, recommended type, paper.
and loaded correctly in the tray?
2 Check the Fuser Unit. Clean the Guide Replace the
Is the Fusing Entrance Guide Plate Plate. Fuser Unit
dirty? (page 8-24).

WorkCentre 6400 Service Manual 5-55

Print-Quality Troubleshooting

Smears or Streaks on Back Side of Page

The print contains markings on the back side of the image.

Initial Actions

■ Check the paper path is free of paper, dust and debris.

■ Check the Waste Cartridge is correctly installed

Troubleshooting Reference Table

Applicable Parts Example Print

■ Transfer Belt, PL14.16

■ Transfer Roller, PL16.20
■ Fuser Unit, PL18.01
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Toner on Back of Print

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the Fuser Unit. Clean the Guide Go to step 2.

Is the Fusing Entrance Guide Plate Plate.
dirty?
2 Is the Fusing Roller damaged? Replace the Go to step 3.
Fuser Unit
(page 8-24).
Go to step 3.
3 Check the Transfer Roller for proper Go to step 4. Properly install
installation. the Transfer
Is it installed correctly? Roller.
4 Check the Transfer Roller. Replace the Go to step 5.
Is the Transfer Roller damaged? Transfer Roller
(page 8-23).
Go to step 5.

5-56 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the Transfer Belt damaged? Replace the Troubleshooting
Transfer Belt complete.
(page 8-20).
Go to step 6.
6 Does the error still occur? Replace the Troubleshooting
HVPS-1 complete.
(page 8-106).
Go to step 7.
7 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-57

Print-Quality Troubleshooting

Uneven Pitch

The pitch along the scan direction is uneven or inconsistent.

Initial Action

■ Check the paper path is free of paper, dust and debris.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Toner Cartridges, PL6.19-22

■ Main Drive Assy, PL12.22
■ Transfer Belt, PL14.16
■ Transfer Roller, PL16.20 Light band
■ Fuser Unit, PL18.01
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Uneven fill
Should see
even fill
left to right

TP6 Grey Fill

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the Toner Cartridges for correct Go to step 2. Reinstall the

installation. Toner
Are the Toner Cartridges correctly Cartridges
installed? (page 8-15).
2 Check the Photo Conductor Drum of Replace the Go to step 3.
each Imaging Unit. affected Imaging
Is the Drum scratched or damaged? Unit
(page 8-17).
3 Is the Transfer Roller dirty or Replace the Go to step 4.
damaged? Transfer Roller
(page 8-23).
4 Check the Fuser Unit. Replace the Go to step 5.
Is the Fusing Roller damaged? Fuser Unit
(page 8-24).

5-58 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Is the Transfer Belt damaged? Replace the Go to step 6.
Transfer Belt
(page 8-20).
6 Check the Laser Unit. Go to step 7. Reinstall the
Is the Laser Unit securely installed Laser Unit
with a fixing screw? (page 8-126).
7 Is there high frequency banding (0.5 Replace the Troubleshooting
mm pitch) in the image during color Main Drive complete.
printing? Assembly
(page 8-142).

WorkCentre 6400 Service Manual 5-59

Print-Quality Troubleshooting

Defects in One Color (C, M, Y, or K)

Only one color (Cyan, Magenta, Yellow, or Black) is too light on the printed
image.

Note
Mottling will occur when printing high coverage of blue color (about 80%
and up) on rough/ recycled paper.

Initial Actions

■ Check the paper path is free of paper, dust and debris.

■ Print the CMYK 50% Fill pages and attempt to isolate the defect to a
specific color. Troubleshoot the affected color.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Toner Cartridges, PL6.19-22

■ Imaging Units, PL6.23-6.26
■ Laser Unit, PL10.11
■ HVPS-1, PL20.16
■ HVPS-2, PL20.21

Light Print (One Color)

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the
Is the paper dry, recommended type, paper.
and loaded correctly in the tray?

5-60 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

2 Perform Test Print (Cyan 50%, Go to step 3. Troubleshooting
Magenta 50%, Yellow 50%, or Black complete.
50%): Enter Service Diagnostics ->
Diagnostic Routines -> dc612 Test
Pattern.
Is the error present in one of these
tests prints?
3 Check the Toner Cartridge. Go to step 4. Replace the
Is there sufficient toner of the affected Toner
affected color? Cartridge
(page 8-15).
4 Check the Toner Cartridge for Replace the Go to step 5.
damages. Toner Cartridge
Is the affected color Toner Cartridge (page 8-15).
damaged?
5 Replace the affected colors Imaging Go to step 6. Troubleshooting
Unit (page 8-17). complete.
Does the print quality defect still
occur?
6 Check the laser window of the Remove the Go to step 7.
affected color. debris.
Is there any debris between the Laser Clean the Laser
Unit and affected color Imaging Unit? Unit window.
7 Replace the Laser Unit (page 8-126). Troubleshooting Replace the
Does the image quality improve? complete. HVPS-1
(page 8-106).
Go to step 8.
8 Does the error still occur? Replace the Troubleshooting
HVPS-2 complete.
(page 8-109).

WorkCentre 6400 Service Manual 5-61

Print-Quality Troubleshooting

Skew

The printed image is not parallel with both sides of the paper.

Initial Action

■ Check the paper path is free of paper, dust and debris.

Troubleshooting Reference Table

Applicable Notes Example Print

■ Tray 1 Separator Roller Assembly,

PL5.25
■ Tray 1 Feed Roller, PL5.29
■ Transfer Belt, PL14.16
■ Tray 2 Separation Roller Assembly,
PL21.07
■ Tray 2 Feed Roller, PL21.27
■ Duplex Unit, PL22.23
■ Tray 3/4 Feed Roller, PL32.05
■ Tray 3/4 Separation Roller Assembly,
PL32.22

Skew 2

Troubleshooting Procedure Table

Step Action and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the

Is the paper dry, recommended type, paper.
and loaded in the correct position?
2 Check the Front Cover Latch. Open and Go to step 3. Troubleshooting
close the Front Cover. complete.
Does the error still occur?
3 Check the Transfer Belt for correct Go to step 4. Troubleshooting
installation. Reseat the Transfer Belt complete.
(page 8-20).
Does the error still occur?
4 Check the skewed tray. Go to step 5. Go to step 9.
Is the skewed paper fed from Tray 1?
5 Check the paper for correct placement. Go to step 6. Troubleshooting
Reseat the paper. complete.
Does the error still occur?
6 Check the Tray 1 Side Guides. Go to step 7. Troubleshooting
Reset the Paper Guides. complete.
Does the error still occur?

5-62 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Action and Questions Yes No

7 Check the paper path. Remove the Go to step 8.
Are there any debris on the paper debris.
path?
8 Replace the Tray 1 Feed Roller Replace the Tray Troubleshooting
(page 8-12). 1 Separator complete.
Does the error still occur? Roller Assembly
(page 8-9).
9 Check the skewed mode through the Go to step 10. Go to step 12.
Duplex Unit.
Is the skewed paper fed from the
Duplex Unit?
10 Check the Duplex Unit for correct Go to step 11. Troubleshooting
installation. complete.
Reseat the Duplex Unit (page 8-175).
Does the error still occur?
11 Check the paper path. Remove the Replace the
Are there any debris on the paper debris. Duplex Unit
path? (page 8-175).
12 Is the skewed paper fed from Tray 2, 3, Go to step 13. Go to step 18.
or 4?
13 Check the affected paper tray for Go to step 14. Troubleshooting
correct installation. complete.
Reseat the tray. Does the error still
occur?
14 Check the paper for correct placement. Go to step 15. Troubleshooting
Reseat the paper in the tray. complete.
Does the error still occur?
15 Check the paper tray Side Guides. Go to step 16. Troubleshooting
Reset the Side Guides. complete.
Does the error still occur?
16 Check the paper path. Remove the Go to step 17.
Are there any debris on the paper debris.
path?
17 Is the skewed paper fed through Tray 3 Perform the Tray Go to step 18.
or 4? Adjustment
procedure
(page 6-3).
18 Does the error still occur? Go to step 19. Troubleshooting
complete.
19 Replace the Feed Roller. Replace the Troubleshooting
■ Tray 2 Feed Roller (page 8-27) Separator Roller complete.
■ Tray 3/4 Feed Roller (page 8-29) Assembly.
Does the error still occur? ■ Tray 2/3/4
(page 8-26)

WorkCentre 6400 Service Manual 5-63

Print-Quality Troubleshooting

Damaged Paper

Paper comes out from the printer wrinkled, folded, or worn-out.

Initial Actions

■ Check the paper path for paper dust or debris.

■ Verify the paper used is supported by the product.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Tray 1 Separator Roller Assy, PL5.25

■ Tray 1 Feed Roller, PL5.29
■ Transfer Belt, PL14.16
■ Fuser Unit, PL18.01
■ Tray 2 Separator Roller Assy,
PL21.07
■ Tray 2 Feed Roller, PL21.27
■ Duplex Unit, PL22.23
■ Tray 3/4 Separator Roller Assy,
PL32.22

Damaged Print Media

Warning
Wait for the Fuser to cool before starting the procedure.

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the

Is the paper dry and loaded correctly? paper.
2 Check that the paper is loaded Troubleshooting Go to step 3.
correctly in the tray and the guides are complete.
set correctly.
Does the document feed correctly?
3 Check the Front Cover Latch. Go to step 4. Troubleshooting
Open and close the Front Cover. complete.
Does the error still occur?
4 Check the Transfer Belt for correct Go to step 5. Troubleshooting
installation. complete.
Reseat the Transfer Belt (page 8-20).
Does the error still occur?

5-64 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Check the Fuser Unit for correct Go to step 6. Troubleshooting
installation. complete.
Reseat the Fuser Unit (page 8-24).
Does the error still occur?
6 Check the paper tray. Go to step 7. Go to step 11.
Did the damaged paper feed from Tray
1?
7 Check the paper for correct placement. Go to step 8. Troubleshooting
Reseat the paper in Tray 1. complete.
Does the error still occur?
8 Check the Tray 1 Side Guides. Go to step 9. Troubleshooting
Reseat the Side Guides. complete.
Does the error still occur?
9 Check the paper path. Remove the Go to step 10.
Is there any debris in the paper path? debris.
10 Replace the Tray 1 Feed Roller Replace the Tray Troubleshooting
(page 8-12). 1 Separator complete.
Does the error still occur? Roller
(page 8-9).
11 Did the damaged paper feed from the Go to step 12. Go to step 14.
Duplex Unit?
12 Check the Duplex Unit for correct Go to step 13. Troubleshooting
installation. complete.
Reseat the Duplex Unit. Does the error
still occur?
13 Check the paper path. Remove the Replace the
Is there any debris in the paper path? debris. Duplex Unit
(page 8-175).
14 Check Tray 2/3/4 for correct Go to step 15. Troubleshooting
installation. complete.
Reseat the tray.
Does the error still occur?
15 Check the paper for correct placement. Go to step 16. Troubleshooting
Reseat the paper. complete.
Does the error still occur?
16 Check the paper tray Paper Guides. Go to step 17. Troubleshooting
Reset the tray Paper Guides. complete.
Does the error still occur?
17 Check the paper path. Remove the Go to step 18.
Is there any debris in the paper path? debris.
18 Replace the Feed Roller. Replace the Troubleshooting
■ Tray 2 Feed Roller (page 8-27) Separation complete.
■ Tray 3/4 Feed Roller (page 8-29) Roller (Tray 2/3/
Does the error still occur? 4, page 8-26).

WorkCentre 6400 Service Manual 5-65

Print-Quality Troubleshooting

Copy/ Scan Troubleshooting

When troubleshooting copy or scan problems, it is recommended to print an

information page and inspect it for the defect. Copy the embedded page and
determine if the defect is present on the copied page. This will help to
determine if the cause is in the print engine or scanner.

Lines, Spots, Streaks & Smears

Poor overall print-quality from a copy or scan.

Initial Actions

■ Print an embedded page to determine if the defect is within the IIT or OIT.

■ Check the document glass for debris or paper residue.

■ Check the DADF paper path for damage, paper dust and debris.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01

Ink Smears Duplex

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Print an embedded page to determine Go to pertinent Go to step 2.

if the defect is in the IIT or IOT. print-quality
Does the defect appear in the troubleshooting
embedded page? procedure.
2 Clean the Document Glass and CVT Go to step 3. Troubleshooting
window using a soft cloth or cotton complete.
swab dampened with isopropyl
alcohol (90%).
Does the error still occur?

5-66 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Is the paper being fed through the Clean the DADF Replace the
DADF? and Feed Scanner
Rollers. Assembly
(page 8-42).

WorkCentre 6400 Service Manual 5-67

Print-Quality Troubleshooting

Background Color, Text, and Images on Copies are Too Light, Too Dark, or
Blurry

The image on the copy appears too light, too dark, or blurry.

Initial Action

■ Raise and lower the Document Feeder to ensure proper position during
the copy sequence.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01

nthemum
nthemum xx

Chrysanthemum x morifolium

nthemum x anthemum
h
Fuzzy Text

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Adjust one or more of the settings in: Go to step 2. Troubleshooting

■ Copy Image Quality tab complete.
■ Scan Advanced Setting tab

2 Perform the Image Quality Calibration Replace the Troubleshooting

routine (page 6-21). Scanner complete.
Does the error still occur? Assembly
(page 8-42).

5-68 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Skew

The printed image is not parallel with both sides of the paper.

Initial Actions

■ Check the DADF paper path for paper dust or debris. Clean the paper
path as needed.

■ Check the original document for a skewed image or other physical

damage to the paper.

Troubleshooting Reference Table

Applicable Notes Example Print

■ Separator Pad Assy, PL1.01

■ DADF Roller Kit Assy, PL1.03
■ DADF Assembly, PL1.06
■ Scanner Assy, PL2.01

Skew 2

Troubleshooting Procedure Table

Step Action and Questions Yes No

1 Print an embedded page to determine Go to the Go to step 2.
if the defect is in the IIT or IOT. pertinent print-
Does the defect occur in the quality
embedded page? troubleshooting
procedure.
2 Perform a copy job. Go to step 3. Troubleshooting
Does the error still occur when complete.
copying?
3 Is the paper being fed through the Go to step 5. Go to step 8.
DADF?

WorkCentre 6400 Service Manual 5-69

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Action and Questions Yes No

4 Check the document. Check the paper Use the
Does the document meet the DADF guide setting to document glass
specifications? ensure it is to make the
adjusted copy or change
correctly. the paper type.
Reset the side
guide of the
DADF.
Go to step 5.
5 Perform the Document Feeder Troubleshooting Go to step 6.
Registration Adjustment (page 6-19). complete.
This adjustment compensates for
image mis-registration (on the page)
and skewed paper fed through the
DADF.
Does the image quality improve?
6 Check the DADF Feed Roller and Clean or replace Go to step 7.
Separator Pad. the components.
Is the Feed Roller or Separator Pad ■ DADF Feed
dirty, worn, or damaged? Roller
(page 8-31)
■ DADF
Separator Pad
(page 8-40)
7 Check the wiring harness connector Replace the Reconnect the
from the DADF to the Scanner. DADF Assembly wiring harness
Is the wiring harness connector (page 8-38). connectors.
securely connected?
8 Check the document placement. Replace the Reseat the
Is the document placed on the glass Scanner document.
correctly? Assembly
(page 8-42).

5-70 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Damaged Paper

Paper comes out of the DADF wrinkled, folded, or worn-out.

Initial Action

■ Check the DADF paper path for dust or debris. Clean the paper path as
needed.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Separator Pad Assy, PL1.01

■ DADF Roller Kit Assy, PL1.03
■ DADF Assy, PL1.06

Damaged Print Media

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Does the document meet the media Go to step 2. Change the

specifications? paper type or
use the
document glass
mode.
2 Check the side guide setting. Troubleshooting Go to step 3.
Reset the side guide setting. complete.
Does the document feed correctly?
3 Replace the DADF Feed Roller and Troubleshooting Replace the
Separator Pad. complete. DADF Assembly
■ DADF Feed Roller (page 8-31) (page 8-38).
■ DADF Separator Pad (page 8-40)
Does the document feed correctly?

WorkCentre 6400 Service Manual 5-71

Print-Quality Troubleshooting

Wavy Lines

The printed image has wavy column line in the direction of the paper travel.

Initial Actions

■ Check the DADF paper path for paper dust or debris. Clean the paper
path as needed.

■ Print an embedded page to determine if the defect is within the IIT or IOT.

Troubleshooting Reference Table

Applicable Parts Example Print

■ DADF Assy, PL1.06

■ Scanner Assy, PL2.01

Hunting

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the paper condition. Go to step 2. Replace the
Is the paper dry, recommended, paper or use the
loaded in the correct position, and document glass
meet the media specifications? mode.
2 Is the DADF closed against the Go to step 3. Close the DADF.
document glass completely?
3 Clean the document glass and CVT Go to step 4. Troubleshooting
window using a soft cloth or cotton complete.
swab dampened with isopropyl (90%).
Does the error still occur?
4 Is the paper being fed through the Go to step 5. Replace the
DADF? Scanner
Assembly
(page 8-42).

5-72 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

5 Use the document glass to make the Replace the Replace the
copy. Scanner DADF Assembly
Does the error still occur? Assembly (page 8-38).
(page 8-42).

WorkCentre 6400 Service Manual 5-73

Print-Quality Troubleshooting

Spots Present in Copies

There are spots in copies when scanning document on the Document Glass.

Initial Action

■ Check the document glass for paper dust or debris.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01

Spots on Glass

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Clean the glass surfaces with a lint free Replace the Troubleshooting
cloth. Scanner complete.
Does the error still occur? Assembly
(page 8-42).

5-74 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Image Does Not Appear

There is no image on the page.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01
■ LVPS, PL10.17

Blank Print

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Open and close the DADF Cover. Go to step 2. Reconnect the

Check the DADF wiring harness wiring harness
connector. connector.
Is the connector securely connected?
2 Check the LVPS voltage. Replace the Replace the
Is there +5 V applied to the LVPS? Scanner LVPS
Assembly (page 8-82).
(page 8-42).

WorkCentre 6400 Service Manual 5-75

Print-Quality Troubleshooting

Large Jitter

The carrier generates jitter while moving from the home position.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01
■ LVPS, PL10.17

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the DADF wiring harness Go to step 2. Reconnect the

connector. wiring harness
Is the connector securely connected? connector.
2 Check the LVPS voltage. Replace the Replace the
Is there +5 V applied to the LVPS? Scanner LVPS
Assembly (page 8-82).
(page 8-42).

5-76 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Image Mis-registered

The composite color image may be misaligned or present an incorrect color

scheme.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01
■ LVPS, PL10.17

Color Registration

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check the DADF wiring harness Go to step 2. Reconnect the

connector. wiring harness
Is the connector securely connected? connector.
2 Is the paper fed from the document Perform “dc609 Go to step 3.
glass? - Document
Glass
Registration” on
page 6-11.
Make sure the
paper is placed
properly against
back left corner
of the glass.

WorkCentre 6400 Service Manual 5-77

Print-Quality Troubleshooting

Troubleshooting Procedure Table (continued)

Step Actions and Questions Yes No

3 Is the paper fed from the DADF? Perform “dc608 Go to step 4.
- Document
Feeder
Registration” on
page 6-11.
4 Check the LVPS voltage. Replace the Replace the
Is there +5 V applied to the LVPS? Scanner LVPS
Assembly (page 8-82).
(page 8-42).

5-78 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

Image Unclear

Image on the paper is not clear.

Initial Actions

■ Check the paper transfer path.

■ Ensure there is no debris in the transfer path.

Troubleshooting Reference Table

Applicable Parts Example Print

■ Scanner Assy, PL2.01

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1 Check for any debris on the document Remove the Replace the
glass. debris and clean Scanner
Is there debris on the document the document Assembly
glass? glass using a (page 8-42).
moistened lint-
free cloth.

WorkCentre 6400 Service Manual 5-79

Print-Quality Troubleshooting

Image Specifications

Note
The printer has 4 mm margins on all sides.

Print Quality Specifications

Characteristic Specifications

Guaranteed Printable Area

When using Tray 1 208 mm x 348 mm
When using Tray 2/3/4 The area of paper except the margin area, which is 4 mm
inside each edge of the paper.
Skew

Simplex Printing ■ Vertical Skew: a < ±2.0 mm (0.08 in.)

■ Horizontal Skew: b < ±1.5 mm (0.06 in.)
Duplex Printing ■ Vertical Skew: a < 3.0 mm (0.12 in.)
(front to back) ■ Horizontal Skew: b < ±2.5 mm (0.10 in.)

Margins

Simplex Printing ■ Side Print Position Accuracy ± 2.0 mm (±0.08 in.)

■ Lead Print Position ± 2.5 mm (±0.01 in.)
Duplex Printing ■ Side Print Position Accuracy ± 3.0 mm (±0.12 in.)
(front to back) ■ Lead Print Position ± 2.5 mm (±0.01 in.)

Magnification

Printing ■ Vertical (applied to 270.9 mm length): < ±2.0 mm

(±0.08 in.) (0.74%)
■ Horizontal (applied to 184.2 mm length): < ±1.2 mm
(±0.05 in.) (0.65%)

Bowing

Simplex Printing ■ Vertical (applied to 200 mm length): < ±0.35 mm

■ Horizontal (applied to 184.2 mm length): < ±0.50 mm
Duplex Printing ■ Side Print Position Accuracy ± 3.0 mm (±0.12 in.)
(front to back) ■ Lead Print Position ± 2.5 mm (±0.01 in.)
Color Registration ■ Vertical: Plain paper at all zones; average 0.15 mm
■ Horizontal: Plain paper at all zones; average 0.10 mm
Scattering ■ Feeding Direction: ± 20 mm
(output paper) ■ Side Direction: + 20 mm

5-80 WorkCentre 6400 Service Manual

Print-Quality Troubleshooting

DADF Image Scan Quality Specifications

Characteristic Specifications
Guaranteed Scannable Area 208 x 348 mm
The area of paper except the margin area, which is 4
mm inside each edge of the paper.
Page Lead Edge ■ 1st Page: Less than and equal ±1.5 mm
Registration Allocation ■ 2nd Page: Less than and equal ±2.0 mm
Page Side Edge Registration ■ 1st Page: Less than and equal ±1.5 mm
Allocation ■ 2nd Page: Less than and equal ±2.0 mm
Page Magnification Less than and equal ±1%
(Fast Scan Direction)
Page Magnification Less than and equal ±1.5%
(Slow Scan Direction)
Pitch Accuracy ■ Mono: Less than 2.5% at 100 dpi
■ Color: Less than 2.0% at 100 dpi

Document Glass Image Scan Image Quality Specifications

Characteristic Specifications

Guaranteed Scannable Area 208 x 348mm

The area of paper except the margin area, which is 4
mm inside each edge of the paper.
Page Lead Edge Registration < 1.0 mm
Allocation)
Page Side Edge Registration < 1.0 mm
Allocation)
Page Magnification Less than and equal ±1.0%
(Fast Scan Direction)
Page Magnification Less than and equal ±1.0%
(Slow Scan Direction)
Pitch Accuracy ■ Black: Less than 2.5% at 100 dpi
■ Color: Less than 2.0% at 100 dpi

WorkCentre 6400 Service Manual 5-81

Print-Quality Troubleshooting

Copy Quality Specifications

Characteristic Specifications
Guaranteed Scannable Area 208 x 348mm
The area of paper except the margin area, which is 4
mm inside each edge of the paper.
Registration Scanning Simplex
Direction ■ Document Glass Scan: 0 ± 2.5 mm

■ DADH: 0 ± 2.5 mm
Duplex
■ Document Glass Scan: 0 ±3.5 mm

■ DADH: 0 ± 4.0 mm

Registration Feeding Simplex

Direction ■ Document Glass Scan: 0 ± 3.0 mm
■ DADH: 0 ± 3.0 mm
Duplex
■ Document Glass Scan: 0 ± 3.0 mm

■ DADH: 0 ±3.5 mm

Skew Simplex
■ Document Glass Scan: ± 1.0%

■ DADH: ± 1.5%
Duplex
■ Document Glass Scan: ± 1.5%

■ DADH: ± 2.5%

Linearity Scanning Direction Line

■ Document Glass Scan: 0.5 mm or less
■ DADH: 0.5 mm or less

5-82 WorkCentre 6400 Service Manual

Adjustments and
Calibrations
In this chapter...
■ Overview
■ Adjustments
■ Calibrations

Chapter
6
Adjustments and Calibrations

Overview

The Adjustments and Calibrations chapter contains procedures for how to

adjust and calibrate various components of the printer. The customer can
access these routines through Machine Status/Tools Menu. These routines
are also accessible through Service Diagnostics.

Note
The menu screens for the routines in Diagnostics and Customer Menu
have different color.

■ In Diagnostics: Orange color

■ In Customer Menu: Blue color

Accessing the Service Diagnostics

1. When the system is idle, press and hold the [*] then + [#] then + [Stop]
buttons.
2. In the field on the UI screen, enter 6789.
3. Touch the Enter button.
4. The Service Info tab is displayed as the default screen upon entering
Service Diagnostics.

Accessing the Machine Status/Tools Menu

1. Press the Log In/Out button.

6-2 WorkCentre 6400 Service Manual

Adjustments and Calibrations

Adjustments

Tray Adjustment (Tray 3/4 Margins)

Note
The Edge Guide Plate can be moved to allow the print start reference
position for the paper to be adjusted.

Note
Only perform the Tray Adjustment when the image position adjustment
fails to bring Tray 3 and 4 into specification.

1. Remove the paper tray.

2. Through the hole in the Paper Lift Plate from the top side of the tray,
loosen two screws that secure the Edge Guide Plate.

Paper Lift Plate Edge Guide Plate Fixing Screws

s6400mfp-238

3. From the bottom of the tray, loosen two screws that secure the Reference
Position Adjusting Plate.
4. Adjust the Reference Position Adjusting Plate as necessary as indicated
on the scale.
5. Tighten the two screws that secure the Reference Position Adjusting
Plate.
6. Through the hole in the Paper Lift Plate from the top side of the tray,
tighten the two screws that secure the Edge Guide Plate.

Adjustment Scale

Reference Position
Adjusting Plate

Reference Position Adjusting Plate Fixing Screws

s6400mfp-239

WorkCentre 6400 Service Manual 6-3

Adjustments and Calibrations

dc130 - Image Position (Margin Adjustment)

The Image Position (dc130) routine allows the user to align the whole ROS
image on the Transfer Belt for each paper group and paper tray.
Initial launch of the Image Position routine includes:
■ Defaults to Tray 2
■ Displays the media type loaded in the selected tray
■ Allows the user to print the test pattern
■ Provides a list of current Image Position adjustment values for all media
and trays
Image Position adjustments include:

■ A printed tutorial page explaining how to perform the adjustment

■ The lead edge (process direction) of the image for each supported media
grouping
■ The side edge (cross-process direction) of the image for the available
trays
■ Side 2 for the adjustments on supported media types
The range of adjustment is -15 to +15 with each increment or decrement
equals to 0.21 mm.
Total amount of adjustment must equals to 30 x 0.21mm = 6.3mm or 3.15mm
in each direction.

Procedure

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Adjustments button.
3. Select dc130 Image Position.
4. Select the appropriate paper size.
5. Touch the Print Test Sheet button to print the page.
6. Follow and perform the instructions on the Image Position page.
7. Make necessary adjustment and touch the Save button to save the
changes.

6-4 WorkCentre 6400 Service Manual

Adjustments and Calibrations

dc131 - NVM Read/Write

Caution
Be careful when making changes to the NVM value. Always write down
the original NVM value (for reference) prior to making any changes.
Incorrect changes to an NVM value could make the printer inoperable. For
NVM value, refer to “NVM Value” on page A-78.

The NVM Read / Write (dc131) routine provides the capability to review and
modify machine control parameters stored in Non-Volatile Memory (NVM).
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc131 NVM Read/Write.

Note
The NVM ID has two numeric fields; the NVM value range is from 1 to
999. Not all NVM fields can be modified. Reference the comprehensive
NVM tables starting on page A-78 for information.

Reading NVM Value

1. In the left Enter NVM ID field, enter the NVM ID.

2. In the right Enter NVM ID field, enter the NVM INDEX.
3. Touch the Read button to perform the task.
4. A Read in process... message is displayed while in progress.
5. The NVM information is displayed in the table.
■ NVMs will be added to the table, if not already in the table.
■ The most recent read NVM will be highlighted in the table.
■ The value of the NVM will be displayed in the Value field.
■ The Value field will only enable when there is a highlighted row in the
table.
6. When the NVM value has been read successfully, a NVM Read
completed successfully message is displayed for 7 seconds.

WorkCentre 6400 Service Manual 6-5

Adjustments and Calibrations

Writing NVM Value

1. Perform the Reading NVM procedure (page 6-5).

Note
The Write button will not be accessible if the Value field is the same as
the current value.

Example: Same Value - (10 and 10)

Example: Different Value - (-10 and 10)

2. Touch the +/- button to toggle the value to positive or negative.

3. Touch the value field and enter the desired value using the keypad.
4. Touch the Write button to perform the NVM Write routine.
5. A Write in process... message is displayed.
6. An NVM ID updated successfully message is displayed when an NVM
value has been updated.

Clearing NVM Display Table

1. On the UI screen, touch the Clear button.

2. This process removes all the currently displayed NVM values from the
table.

6-6 WorkCentre 6400 Service Manual

Adjustments and Calibrations

dc301 - NVM Initialization

Caution
Use the NVM Initialization procedure as a last option when servicing the
WorkCentre 6400.

The NVM Initialization (dc301) routine allows the user to reset the NVM value
to default value or all applicable NVM within a specified service or module.
Multiple services and/or modules may be initialized by a single request.
The NVM parameters initialized within each domain (copier, network
controller, and Fax) are dependent on the initialization type (user data, system
data, and all data). Certain groups of NVM parameters are not affected by the
NVM Initialization such as billing counters, even in the case of an all data
initialization.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc301 NMV Initialization.
4. Select the appropriate Domain and NVM Data options.
■ Domain - Copier, Fax
■ NVM Data - User, System, All
5. Touch the Initialize button to perform the procedure.

6. A confirmation screen is displayed “Are you sure you want to initialize

NVM?”
7. Touch the Initialize button.
8. After the NVM Initialization procedure is complete, an Initialization
successful message is displayed.
9. Touch the Close button to exit the NVM Initialization screen.

Note
Resetting all NVM data within the Copier Domain will cause the
installation wizard to appear after the next reboot.

WorkCentre 6400 Service Manual 6-7

Adjustments and Calibrations

dc361 - NVM Save and Restore

The NVM Save and Restore (dc361) routine allows the user to back-up NVM
data and restore the machine's NVM parameters to their previous values
following a service action (i.e. NVM module replacement, Copy Controller
(CC) Hard Disk Drive replacement, Printed Circuit Board (PCB) replacement,
or any others that would necessitate a full NVM initialization).
DC361 routine can be used to recover a machine's NVM values to one of the
last 30 auto-saved set of parameters, in the event that a complete NVM failure
occurred. The “Auto Save” function automatically store the NVM once each
day for the last 30 days.
DC361 routine also includes the capability to copy files between the hard
drive and a USB drive.

Saving NVM

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Adjustments tab.
3. Select dc361 NVM Save and Restore.
4. From the UI screen, select Machine NVM.
5. From the pull-down menu, select Save to Hard Drive.

6. A progress message Saving NVM in Progress is displayed.

7. When NVM Save procedure is complete, the dc361 NVM Save and
Restore menu is displayed.
8. Touch the Close button to exit the dc361 NVM Save and Restore
screen.

6-8 WorkCentre 6400 Service Manual

Adjustments and Calibrations

Restoring NVM

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Adjustments tab.
3. Select dc361 NVM Save and Restore.
4. From the UI screen, select Hard Drive.
5. From the pull-down menu, select Restore Machine NVM.

6. A progress message Restoring NVM in Progress is displayed.

7. When NVM Restore procedure is complete, the dc361 NVM Save and
Restore menu is displayed.
8. Touch the Close button to exit the dc361 NVM Save and Restore
screen.

WorkCentre 6400 Service Manual 6-9

Adjustments and Calibrations

Copying NVM from Hard Drive to USB Device

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Adjustments tab.
3. Select dc361 NVM Save and Restore.
4. From the UI screen, select Hard Drive.
5. From the pull-down menu, select Copy To USB Device.

6. A progress message Copying NVM in Progress is displayed.

7. When NVM Restore procedure is complete, the dc361 NVM Save and
Restore menu is displayed.
8. Touch the Close button to exit the dc361 NVM Save and Restore
screen.

Copying NVM from USB Device to Hard Drive

1. Access the Service Diagnostics menu (page 4-7).

2. Touch the Adjustments tab.
3. Select dc361 NVM Save and Restore.
4. From the UI screen, select USB.
5. From the pull-down menu, select Copy To Hard Drive.
6. A progress message Copying NVM in Progress is displayed.
7. When NVM Restore procedure is complete, the dc361 NVM Save and
Restore menu is displayed.
8. Touch the Close button to exit the dc361 NVM Save and Restore
screen.

6-10 WorkCentre 6400 Service Manual

Adjustments and Calibrations

dc608 - Document Feeder Registration

The Document Feeder Registration (dc608) routine checks the image

registration (on the page) of the documents fed through the DADF and
automatically corrects any misalignments relative to the image being placed
on the page. This adjustment also performs a de-skew adjustment and
automatically corrects any misalignment.
The process performs automatically and requires the user to place 3 sheets of
letter or A4 paper on the DADF and then the target sheet. The printer will
report to the user (Pass/Fail) the outcome of the adjustment.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc608 Document Feeder Registration.
4. On the UI screen, following the instructions and touch the Start button.
5. A progress message Document Feeder Registration in Progress is
displayed.
6. When the procedure is complete, a message Document Feeder
Registration was Successful is displayed.
7. Touch the Close button to exit the completion screen.
8. Touch the Close button to exit the dc608 Document Feeder
Registration screen.

dc609 - Document Glass Registration

The Document Platen Registration (dc609) checks the image registration (on
the page) of the documents placed on the document glass and automatically
corrects any misalignments relative to the image being placed on the page.
The process performs automatically and requires the user to place the target
sheet onto the Document Glass. The printer will report to the user (Pass/Fail)
the outcome of the adjustment.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc609 Document Glass Registration.
4. On the UI screen, following the instructions and touch the Start button.
5. A progress message Document Glass Registration in Progress is
displayed.
6. When the procedure is complete, a complete message Document Glass
Registration was Successful is displayed.
7. Touch the Close button to exit the completion screen.
8. Touch the Close button to exit the dc609 Document Glass Registration
screen.

WorkCentre 6400 Service Manual 6-11

Adjustments and Calibrations

dc909 - Calibrate for Paper Type

The Calibrate for Paper Type (dc909) adjustment routine provides the user the
ability to adjust the 2nd Image Transfer Power output (ATVC) in order to
compensate for the use of thick or specialty media.
The adjustment is effective in correcting the following types of defects on both
simplex and duplex prints.
■ Low Density
■ Foggy Background
■ Voids
■ White Spots
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc909 Calibrate for Paper Type.
4. Load the paper type to calibrate in tray 1.
5. Touch the Print Test Sheets button to perform the procedure.
6. A progress message Printing Test Sheets (-3 -> 3) is displayed.
7. A set of 7 pages (-3 to +3) are printed.
8. Examine the printed pages to determine which one has the best color
density.
9. If adjustment is required, select the page that has the best overall image
quality. Touch the Save button.
10. If optimal adjustment is outside the range of the initial group of the 7
prints, print the appropriate pages:
■ Print test pages from 4 to 7: From the Page Number menu, select 3.
Touch the Print Pages (4 -> 7) button.

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Adjustments and Calibrations

■ Print the test pages from -8 to -4: From the Page Number pull-down
menu, select -3. Touch the Print Pages (-8 -> -4) button.

11. Repeat the above procedure as necessary for each loaded media type.
12. Touch the Close button to exit the completion screen.
13. Touch the Close button to exit the Calibrate Paper Type screen.

dc936 - Image Quality Calibration

The Image Quality Calibration (dc936) routine allows the user to recalibrate
the IOT to correct common imaging defects.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc936 Image Quality Calibration.
4. Touch the Start Calibration button to start the procedure.
5. A progress message Image Quality Calibration is in progress is
displayed.
6. After the process is complete, a completion message Image Quality
Calibration is complete is displayed.
7. Touch the Close button to exit the dc936 Image Quality Calibration
screen.

Note
Refer to “Image Quality Control (Image Stabilization)” on page 2-101 for
detailed information on image stabilization.

WorkCentre 6400 Service Manual 6-13

Adjustments and Calibrations

dc960 - Altitude Adjustment

The Altitude Adjustment (dc960) routine is used to adjust the altitude when
the product is placed in a location where the altitude is equal or greater than
2000 meters (approximately 6500 feet) in elevation.
1. Access the Service Diagnostics menu (page 4-7).
2. Touch the Adjustments tab.
3. Select dc960 Altitude Adjustment.
4. Select the appropriate option
■ High Altitude - For device located where the altitude is greater than
2000 meters (6500 feet) in elevation.
■ Standard Altitude - For device located where the altitude is less than
2000 meters (6500 feet) in elevation.
5. Touch the Save button to save the change and exit the dc960 Altitude
Adjustment screen.

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Adjustments and Calibrations

Calibrations

Color Calibration

The Color Calibration routine allows the user to adjust the appearance of
printed pages. It is all-encompassing in that it calibrates both the true and
composite grays, and also the colors (cyan, magenta, and yellow).
Color Calibration allows the user to:

■ Calibrate printed color under normal light.

■ Calibrate just once for all print modes.

■ Avoid interactions, where one set of adjustments affects another.

■ Perform calibration without using a scanner.

Procedure

1. Press the Log In/Out button.

2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. The Main UI screen is displayed with the admin button highlighted.
7. Press the Machine Status button.
8. Touch the Tools button.
9. Touch the Troubleshooting button.
10. Under the Features screen, select Calibration.
11. Select Color Calibration.
12. Select the appropriate option for the environment.
■ Normal Office Lighting - use for standard fluorescent lighting.
■ F50 Calibrated Light - use for proofing in the graphic arts area.
13. Touch the Next button.
14. Touch the Print Test Sheets button to print a calibration page.
15. A Printing Calibration Sheet progress screen is displayed and a Cyan/
Magenta Calibration page is printed.
16. Follow and perform the procedure on the Calibration Sheet.
17. Make the appropriate adjustments as necessary.
Values range:
■ Cyan/Magenta, Black, Green: -5 to +5
■ Light, Medium, and Dark Adjustments: 0 to 54.
18. Touch the Review/Reprint button to print the calibration pages.
19. Click the Next button.
20. Repeat the process for the other options: Black, Green, Light Adjustment,
Medium Adjustment, and Dark Adjustment.
16. Touch the Done button when the procedure is complete.

WorkCentre 6400 Service Manual 6-15

Adjustments and Calibrations

Altitude Adjustment

The Altitude Adjustment routine is used to adjust the altitude when the
product is placed in a location where the altitude is equal or greater than 2000
meters (approximately 6500 feet) in elevation.
1. Press the Log In/Out button.
2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. The Main UI screen is displayed with the admin button highlighted.
7. Press the Machine Status button.
8. Touch the Tools button.
9. Touch the Troubleshooting button.
10. Under the Features screen, select Calibration.
11. Browse through the menu, find and select Altitude Adjustment.
12. The Altitude Adjustment menu is displayed. Select the appropriate
option.
■ High Altitude - For device located where the altitude is greater than
2000 meters (6500 feet) in elevation.
■ Standard Altitude - For device located where the altitude is less than
2000 meters (6500 feet) in elevation.
13. Touch the Save button to save the change and exit the Altitude
Adjustment screen.

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Adjustments and Calibrations

Calibrate Paper Type

The Calibrate for Paper Type Adjustment routine allows the user to adjust the
2nd Image Transfer Power output in order to compensate for the use of thick
or speciality media.
The adjustments is effective in correcting the following types of defects on
both simplex and duplex prints.
■ Low Density
■ Foggy Background
■ Voids
■ White Spots

Procedure

1. Press the Log In/Out button.

Note
The Toner Transfer Setting adjustment values range is -8 to +7.

16. Touch the Save button to save the data.

17. Touch the Print Test Sheets to reprint the pages if necessary.
18. Touch the Close button to exit the Calibrate Paper Type screen.

WorkCentre 6400 Service Manual 6-17

Adjustments and Calibrations

Document Feeder Registration

The Document Feeder Registration routine checks the image registration (on
the page) of the documents fed through the DADF and automatically corrects
any misalignments relative to the image being placed on the page. This
adjustment also performs a de-skew adjustment and automatically corrects
any misalignment.
The process performs automatically and requires the user to place 3 sheets of
letter or A4 paper on the DADF and then the target sheet. The printer will
report to the user (Pass/Fail) the outcome of the adjustment.
1. Press the Log In/Out button.
2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. The Main UI screen is displayed with the admin button highlighted.
7. Press the Machine Status button.
8. Touch the Tools button.
9. Touch the Troubleshooting button.
10. Under the Features screen, select Calibration.
11. Select Document Feeder Registration.
12. On the UI screen, following the instructions and touch the Start button.
13. A progress message Document Feeder Registration in Progress is
displayed.
14. When the procedure is complete, a message Document Feeder
Registration was Successful is displayed.
15. Touch the Close button to exit the completion screen.
16. Touch the Close button to exit the Document Feeder Registration
screen.

6-18 WorkCentre 6400 Service Manual

Adjustments and Calibrations

Document Glass Registration

The Document Glass Registration checks the registration of the Document

Glass and corrects any misalignments.
The process performs automatically and requires the user to place the target
sheet onto the Document Glass. The printer will report to the user (Pass/Fail)
the outcome of the adjustment.
1. Press the Log In/Out button.
2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. The Main UI screen is displayed with the admin button highlighted.
7. Press the Machine Status button.
8. Touch the Tools button.
9. Touch the Troubleshooting button.
10. Under the Features screen, select Calibration.
11. Select Document Glass Registration.
12. On the UI screen, following the instructions and touch the Start button.
13. A progress message Document Glass Registration in Progress is
displayed.
14. When the procedure is complete, a complete message Document Glass
Registration was Successful is displayed.
15. Touch the Close button to exit the completion screen.
16. Touch the Close button to exit the Document Glass Registration
screen.

WorkCentre 6400 Service Manual 6-19

Adjustments and Calibrations

Image Position (Margin Adjustment)

The Image Position routine allows the user to correctly align the whole ROS
image on the Transfer Belt for each paper group and paper tray.
Initial launch of the Image Position routine includes:
■ Defaults to Tray 2
■ Displays the media type loaded in the selected tray
■ Allows the user to print the test pattern
■ Provides a list of current Image Position adjustment values for all media
and trays
Image Position adjustments include:

■ A printed tutorial page explaining how to perform the adjustment

■ The lead edge (process direction) of the image for each supported media
grouping
■ The side edge (cross process direction) of the image for the available
trays
■ Side 2 for the adjustments on supported media types
The range of adjustment is -15 to +15 with each increment or decrement
equals to 0.21 mm.
Total amount of adjustment must equals to 30 x 0.21mm = 6.3mm or 3.15mm
in each direction.

Procedure

1. Press the Log In/Out button.

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Adjustments and Calibrations

Image Quality Calibration

The Image Quality Calibration routine allows the user to recalibrate the IOT to
correct imaging defects.
1. Press the Log In/Out button.
2. In the User Name field on the UI, enter admin (default User Name).
3. Touch the Next button.
4. In the password field, enter 1111 (default password).
5. Touch the Enter button.
6. The Main UI screen is displayed with the admin button highlighted.
7. Press the Machine Status button.
8. Touch the Tools button.
9. Touch the Troubleshooting button.
10. Under the Features screen, select Calibration.
11. Select Image Quality Calibration.
12. Touch the Start Calibration button to start the calibration procedure.
13. An Image Quality Calibration is in process message screen is displayed.
14. After the process is complete, a message Image Quality Calibration is
complete is displayed.
15. Touch the Close button to exit the Image Quality Calibration screen.

Note
Refer to “Image Quality Control (Image Stabilization)” on page 2-101 for
detailed information on image stabilization.

WorkCentre 6400 Service Manual 6-21

Adjustments and Calibrations

Control Panel Diagnostics

The control panel diagnostics provides access to various test that help
troubleshoot issues with the display or buttons. A touch panel calibration
routine is available to align touching the screen to the on screen display. The
touch panel calibration should always been performed after an LCD display is
replaced.
1. Press the “Dial Pause” + “*” + “#” buttons simultaneously to access the
Panel Diagnostics menu.
2. A list of tests is displayed on the Panel Diagnostics menu.
■ LCD Pixel Test
■ Touch Panel Calibration
■ Touch Panel Test
■ Button Test
■ Display Vertical Test
■ LED Test
■ Exit
3. Select the test on the UI Panel or press the number on the Control Panel
corresponding to the test on the UI Panel to be performed.
4. To exit any test while the test is in progress, press the “C” button on the
Control Panel.

Note
The LED Test functions properly but will require a power cycle to exit due
to the nature of the test.

5. To exit the UI Diagnostics routine, touch the Exit button on the UI Panel.

User Interface Calibration Menu

Type of Test Description

LCD Pixel Test Allows the user to determine whether the pixels in the
display are functioning correctly.
Touch Panel Calibration Performs a nine point calibration of the UI panel to align
the touch sensitive layer with the underlying LCD display.
Touch Panel Test Allows the user to touch the panel and confirm it is being
sensed.
Display Vertical Test Allows the user to visually detect luminosity defects in the
LCD display.
LED Test Allows the user to verify each of the LED’s associated with
UI panel are working in relation to the corresponding hard
keys.
Exit Exits the UI Calibration.

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Adjustments and Calibrations

Scanner Calibration

Note
You do not need to calibrate the scanner regularly. Only calibrate when
you have replaced the scanner or the DADF or if skew occurs when
copying from the DADF.

The Scanner must be calibrated using the document glass and the document
feeder. This procedure is the same as dc608 and dc609 routines in
diagnostics.

s6400mfp-879

Procedure

1. Start the calibration procedure from the printer’s control panel.

2. Log in as a system administrator. Press the Log in/Out button (user
name:admin, default password:1111).
3. On the control panel, press the Machine Status button.
4. Select the Tools tab.
5. Select Troubleshooting, then Calibration.
6. Select Document Glass Registration.

WorkCentre 6400 Service Manual 6-23

Adjustments and Calibrations

7. Place the scanner calibration page on the document glass. The scanner
calibration page is included with your replacement scanner or document
feeder.

s6400mfp-880

8. Close the document feeder.

9. On the Control Panel, select Start to scan the calibration page.
10. Wait for the scan to be completed, and then select one of the following
options:
■ If the Control Panel indicates Success, select Close and then
continue with Step 11.
■ If the Control Panel indicates Failure, select Close, and then repeat
from Step 9.
11. Scanner calibration from the document glass is complete. The scanner
must now be calibrated from the document feeder. Remove the Scanner
Calibration page from the document glass, and place three blank sheets
of paper (letter or A4 size) in the document feeder. Place the calibration
page on top of the three sheets. Adjust the paper guides to fit against the
calibration page.

Note
The paper guides should be adjusted to fit against the paper. If the page
is misaligned, the calibration procedure will fail.

s6400mfp-881

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Adjustments and Calibrations

12. On the Control Panel, select Document Feeder Registration, then press
the Start button to scan the calibration page.
13. Wait for the scan to be completed, then select one of the following
options:
■ If the control panel indicates Success, select Close. The calibration
procedure is complete.
■ If the control panel indicates Failure, select Close, then repeat from
step 11.

Note
When you are finished calibrating the scanner, please return the
calibration page to Xerox with the defective scanner or document feeder.

WorkCentre 6400 Service Manual 6-25

Adjustments and Calibrations

6-26 WorkCentre 6400 Service Manual

Cleaning and Maintenance
In this chapter...
■ Service Maintenance Procedure
■ Cleaning
■ Maintenance

Chapter
7
Cleaning and Maintenance

Service Maintenance Procedure

Perform the following procedures whenever you check, service, or repair a

printer. Cleaning the printer, as outlined in the following steps, assures proper
operation of the printer and reduces the probability of having to service the
printer in the future.
The frequency of use, Average Monthly Print Volume (AMPV), type of paper
printed on, and operating environment are factors in determining how critical
cleaning the printer is and how often it is necessary. Record the number of
sheets printed.

Recommended Tools

■ Toner vacuum cleaner

■ Clean water
■ Clean, dry, lint-free cloth
■ Black, light protective bag

Cleaning

Perform the following general cleaning steps as indicated by the printer’s

operating environment.

Caution
Never apply alcohol or other chemicals to any parts of the printer. Never
use a damp cloth to clean up toner. If you remove the Imaging Units,
place them in a light-protective bag or otherwise protect them as
exposure to light can quickly degrade performance and result in early
failure.

1. Record the total impression counted.

2. Print several sheets of paper to check for Print Quality (PQ) problems or
defects.
3. Copy several sheets of paper to check for Image Quality (IQ) problems or
defects.
4. Turn the printer power Off and disconnect the power cord.
5. Remove the following components before cleaning.
■ Toner Cartridges (page 8-15)
■ Imaging Units (page 8-17)
■ Waste Cartridge (page 8-19)
6. Using a Toner Vacuum, remove any accumulated toner from around the
Laser Unit, then clean each Laser lens with a dry, lint-free cloth.
7. Be sure that all cover vents are clean and free of obstructions.
8. Inspect the entire paper path and remove any debris or foreign objects
found.
9. Remove and clean the paper trays.

7-2 WorkCentre 6400 Service Manual

Cleaning and Maintenance

10. Clean all rubber rollers with a lint-free cloth slightly dampened with cold
water.

Cleaning the Control Panel

Caution
Do not use any organic solvent, acid, or alkali solution.

1. Use a dry or soft cloth to wipe the Control Panel. Be sure there are no
scratches on the Control Panel surface.

Log In/Out Help

Services Home
ABC DEF
1 2 3 Clear All
GHI JKL MNO
Features 4 5 6 Interrupt
PRS TUV WXY Printing

7 8 9
Job Status
Dial Pause
0 # Stop

Machine Status
*
// C Start
Language

s6400mfp-484

WorkCentre 6400 Service Manual 7-3

Cleaning and Maintenance

Inspecting and Cleaning the DADF Feed Rollers and Pads

1. Open the DADF Cover.

Caution
Be careful not to touch the DADF Feed Rollers to prevent getting them
dirty.

2. Inspect the DADF Feed Rollers for damage.

s6400mfp-848

3. Use a moistened lint-free cloth to wipe the Feed Rollers.

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7-4 WorkCentre 6400 Service Manual

Cleaning and Maintenance

4. Inspect the DADF Pads for damage.

5. Use a moistened lint-free cloth to wipe the Pads.

s6400mfp-850

6. Close the DADF Cover.

WorkCentre 6400 Service Manual 7-5

Cleaning and Maintenance

Cleaning the Tray 1 Feed Roller

Note
Use only a moistened lint-free cloth to clean the Feed Roller. Do not use
any kind of cleaning agent to clean the Feed Roller.

1. Open Tray 1.

1
2

s6400mfp-485

2. Push down on the Lift Plate to lock it in the down position.

s6400mfp-486

7-6 WorkCentre 6400 Service Manual

Cleaning and Maintenance

3. Use a moistened lint-free cloth to clean the Feed Roller. Be sure the Feed
Roller is not damaged. Replace the Feed Roller (page 8-12) if it appears
to be excessively worn or damaged.

s6400mfp-487

4. Close Tray 1.

2 1

Cleaning the IDC Sensor

1. Remove the Transfer Belt (page 8-20).

2. Insert a Q-tip into the opening on top of the Guide and move the Q-tip
side to side to clean the sensor.
3. Repeat step 2 for the sensor on the opposite side of the Guide.

LED Openings s6400mfp-883

7-16 WorkCentre 6400 Service Manual

Cleaning and Maintenance

Cleaning the Document Glass

Note
Use only a moistened lint-free cloth to clean the document glass. Do not
use any kind of cleaning agent to clean the glass.

1. Open the DADF Assembly.

2. Use a moistened lint-free cloth to clean the document glass. Be sure
there are no scratches on the document glass surface.

s6400mfp-501

3. Wipe the surface underneath the Document Feeder.

s6400mfp-502

WorkCentre 6400 Service Manual 7-17

Cleaning and Maintenance

4. Close the DADF Assembly.

s6400mfp-503

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Cleaning and Maintenance

Maintenance

RIP (Repair, Inspect, and Prevent) Procedure

Perform these routine maintenance procedures during the course of servicing

the printer.

■ Clean all Feed Rollers, Exit Rollers, and Guides within the paper path.
■ Fully open and clean the paper trays.

■ Clean the 4 Laser Unit windows.

■ Clean the Document Glass.

■ Print a Configuration Report and System Status Page; diagnose, and

repair any problems as indicated.

■ Check the System Software versions; as appropriate, update to the latest

versions.

■ Check the cleanliness of the exterior and interior of the printer; if

necessary, clean (dust or vacuum) these areas.

■ Check that all cover vents are clean and free of obstructions.

■ Review with the customer all work that was performed and discuss proper
printer care.

WorkCentre 6400 Service Manual 7-19

Cleaning and Maintenance

7-20 WorkCentre 6400 Service Manual

Service Parts Disassembly
In this chapter...
■ Table of Contents
■ Overview
■ Maintenance Items and Consumables
■ Duplex Automatic Document Feeder (DADF)
■ Scanner Assembly
■ Covers
■ Paper Trays
■ Optional 500-Sheet FeederPaper Feed and Registration
■ Electrical
■ Xerographics
■ Drive Assembly
■ Fans and Motors
■ Optional 500-Sheet Feeder
■ Duplex
■ Finisher (Option)
■ Printer Stand (Option)

Chapter
8
Service Parts Disassembly

Table of Contents

■ The notation “(item X)” points to a numbered callout in the illustration

corresponding to the disassembly procedure being performed.

■ The notation “PLX.X.X” indicates that this component is listed in the Parts
List.

■ Bold arrows in an illustration show direction of movement when removing

or replacing a component.

■ The notation “(tap, plastic, 10 mm)” or “(metal, 6 mm)” refer to the type of
screw being removed.

Note
Provides information specific to the replacement of parts or
assemblies.

Preparation

Before you begin any removal and replacement procedure:

1. Wear an Electrostatic Discharge wrist strap to help prevent damaging to
the sensitive electronics of the printer circuit boards.
2. Turn the printer power Off and disconnect the power cord from the wall
outlet.
3. Disconnect all computer interface cables from the printer.
4. Remove Tray 2.
5. Open the Front Door.
6. Remove the following Maintenance Items and Consumables.

Caution
Do not expose the Imaging Units to light for more than 5 minutes. After
removal, cover the Imaging Units to minimize the amount of light striking
the Toner Cartridges. Prolonged exposure to light significantly reduces
Imaging Unit performance.

a. Toner Cartridges (page 8-15)

b. Imaging Units (page 8-17)
c. Waste Cartridge (page 8-19)

Warning
The Fuser may be hot. Turn the printer power Off and allow at least 5
minutes for the Fuser to cool before removing the Fuser.

d. Fuser Unit (page 8-24)

e. Transfer Roller (page 8-23)

Caution
Do not touch the Transfer Unit belt area.

f. Transfer Belt (page 8-20)

g. Ozone Filter (page 8-18)
h. Feed Rollers (Tray 1, page 8-12), (Tray 2, page 8-27), (Lower Feeder
Unit, page 8-29)

8-6 WorkCentre 6400 Service Manual

Service Parts Disassembly

i. Duplex Unit (page 8-175)

Note
Names of parts that appear in the removal and replacement procedures
may not match the names that appear in the Parts List. For example, a
part called the Registration Chute Assembly in a removal procedure may
appear on the Parts List as Assembly, Registration Chute. When working
on a removal procedure, ignore any prerequisite procedure for parts
already removed.

Caution
Many parts are secured by plastic tabs. Do not over flex or force these
parts. Do not over torque the screws threaded into plastic parts.

Warning
Unplug the AC power cord from the wall outlet before removing any
printer part.

WorkCentre 6400 Service Manual 8-7

Service Parts Disassembly

Fastener Types

The following table lists the primary types of Posi-Drive screws used to
assemble the printer. The procedures provide dimensional specifications for
screws being removed.

Posi-Drive Screw Types used in the Printer

Type Application Shape Characteristics

Self- 1. Silver colored.

tapping, 2. Screw thread is coarse
plastic compared to metal screw.
Coarse
3. Screw tip is thin.

Plastic
Parts etc.

Self- 1. Silver colored.

tapping, 2. Screw has a flange.
plastic, with 3. Screw thread is coarse
flange compared to metal screw.
Coarse
Plastic 4. Screw tip is thin.
Parts etc.

Sheet Metal, 1. Silver colored.

silver 2. Diameter is uniform.
3. Typically 6 mm in length.

Sheet
Parts etc.
Metal

Caution
Use care when installing self-tapping screws in plastic. To properly start
the screw in plastic, turn the screw counter-clockwise in the hole until you
feel the screw engage the threads, then tighten as usual. Failure to
properly align or over tighten the screw can result in damage to previously
tapped threads.

Always use the correct type and size screw. Using the wrong screw can
damage tapped holes. Do not use excessive force to remove or install
either a screw or a printer part.

8-8 WorkCentre 6400 Service Manual

Service Parts Disassembly

Maintenance Items and Consumables

Maintenance and Consumable items include the Toner Cartridges, Imaging

Units, Waste Cartridge, Fuser Unit, Transfer Roller, Transfer Belt, Ozone
Filter, and Feed Rollers.

Tray 1 Separation Roller Assembly (PL5.25)

1. Remove Tray 1 (page 8-53).

2. Press the two pins inward to release the clips on the bottom of the Guide
(PL5.1).
3. Push from the bottom of the Guide to release the Guide.
4. Lift and remove the Guide.

Guide s6400mfp-350

WorkCentre 6400 Service Manual 8-9

Service Parts Disassembly

5. Remove 2 screws that secure the Guide (PL5.22).

6. Release the 2 latches to remove the Guide.

Latches

s6400mfp-352

7. Remove 2 screws that secure the Separation Roller Assembly.

8. Remove the Separation Roller Assembly from Tray 1.

s6400mfp-670

8-10 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
Be sure to route the wiring harness through the slots next to the
Guide as in the illustration.

s6400mfp-672

WorkCentre 6400 Service Manual 8-11

Service Parts Disassembly

Tray 1 Feed Roller (PL5.29)

1. Follow Tray 1 Separator Roller Assembly (page 8-9) (steps 1-6).

2. Remove the C-Clip (PL5.a) and Bushing (PL5.18).

C-Clip

Bushing

s6400mfp-671

3. Slide the Shaft to the right and lift the Shaft up away from Tray 1.
4. Remove the C-Clip (PL5.a) and Clutch (PL5.30).
5. Remove the Tray 1 Feed Roller.

C-Clip Clutch Feed Roller

s6400mfp-354

8-12 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
When installing the Feed Roller and the Clutch, make sure that the
Feed Roller is mounted in the direction as shown in the illustration.

Be sure to position the notches on the One-way Clutch in the two holes on the
Feed Roller.

Tabs

Feed Roller Clutch

s6400mfp-355

Be sure to align the two white latches over the Shaft before installing the Feed
Roller and the Shaft.

Front Side
A4
B5
A5

71/4
81/2

s6400mfp-666

WorkCentre 6400 Service Manual 8-13

Service Parts Disassembly

Be sure to position the clip evenly on top of the bearing.

Bearing

Clip

1. Follow the Toner Cartridge procedure (page 8-15) (steps 1-3).

2. Press the Push tab and pull the Imaging Unit out of the printer.

s6400mfp-367

Replacement Note
Do not touch the surface of the Photo Conductor Drum.

Caution
Do not expose the Imaging Unit to light for more than 5 minutes. Cover
the Imaging Unit to avoid damage.

00:05:00

s6400mfp-375

WorkCentre 6400 Service Manual 8-17

Service Parts Disassembly

Ozone Filter (PL7.17)

1. Grasp the handle of the Ozone Filter and pull it out of the printer.

s6400mfp-356

8-18 WorkCentre 6400 Service Manual

Service Parts Disassembly

Waste Cartridge (PL9.09)

1. Open the Front Door (PL3.10).

2. Turn the lever counter-clockwise to unlock the Waste Cartridge.

s6400mfp-376

3. Release the left and right handles and pull the Waste Cartridge out from
the printer.

Note
To prevent spilling waste toner, leave the dial in the Unlocked position
while the Waste Cartridge is removed from the printer.

Handles s6400mfp-377

WorkCentre 6400 Service Manual 8-19

Service Parts Disassembly

Transfer Belt (PL14.16)

1. Open the Front Door (PL3.10).

2. Remove the Toner Cartridges (page 8-15).
3. Remove the Imaging Units (page 8-17).
4. Remove the Waste Cartridge (page 8-19).
5. If a Finisher is installed with the printer, continue to step 5a. If the printer
does not have a Finisher, go to step 6.
a. Remove the Finisher Assembly (page 8-182), if installed.
b. Remove the Finisher Hooks (PL37.16).
6. Remove the Left Side Cover (page 8-52).
7. Open the Right Door (PL15.01).
8. Loosen the 2 metal screws to unlock the Transfer Belt.

s6400mfp-381

8-20 WorkCentre 6400 Service Manual

Service Parts Disassembly

9. Slide the Shutter Lever toward the front of the printer to unlock the
Transfer Belt.

s6400mfp-382

Caution
Do not touch the Transfer Unit belt.

10. Grasp the Transfer Belt handle and pull the it out of the printer.

s6400mfp-383

WorkCentre 6400 Service Manual 8-21

Service Parts Disassembly

Replacement Note

Be sure to remove the packaging material from the new Transfer Belt prior to
installation.
Be careful not to hit the Docking Gear against the rail or other mechanisms to
prevent damaging the Transfer Belt.

s6400mfp-385

Be sure to run the Image Quality Calibration routine (Tools ->

Troubleshooting -> Calibration) after replacing the Transfer Belt. It may be
necessary to run the Image Quality Calibration routine several times to ensure
acceptable print quality.

8-22 WorkCentre 6400 Service Manual

Service Parts Disassembly

Transfer Roller (PL16.20)

Caution
Do not touch the foam roller to avoid print defects.

1. Open the Right Door (PL15.01).

2. Press the amber gold tabs located at the front and rear ends of the
Transfer Roller inward to unlock the Transfer Roller.

Lock

Lock
Transfer Roller
s6400mfp-378

3. While holding the levers, rotate and lift the Transfer Roller up to remove it.

Springs
s6400mfp-379

Replacement Note
Be sure to run the Image Quality Calibration routine (Tools ->
Troubleshooting -> Calibration) after replacing the Transfer Roller.
It may be necessary to run the Image Quality Calibration routine
several times to ensure acceptable print quality.

Verify both springs are in place when reinstalling the Transfer Roller.

WorkCentre 6400 Service Manual 8-23

Service Parts Disassembly

Fuser Unit (PL18.01)

Warning
The Fuser may be hot. Turn the printer power Off and allow adequate time
for the Fuser to cool before removing the Fuser.

1. Open the Front Door (PL3.10).

2. Lift the Control Panel.
3. Open the Right Door (PL15.01).
4. Loosen the 2 amber gold plastic screws that secure the Fuser Unit.

s6400mfp-387

5. Grasp the amber gold Fuser handles, tilt and slide the Fuser Unit out to
remove it.

s6400mfp-668

8-24 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
Be sure to tilt the Fuser Unit at an angle when installing the Fuser
Unit.

s6400mfp-720

WorkCentre 6400 Service Manual 8-25

Service Parts Disassembly

Tray 2/ 3/ 4 Separation Roller Assembly (PL21.7, PL32.22)

1. Slide Tray 2 (PL21.28) or Tray 3/ Tray 4 (PL31.24) out.

2. Remove 2 screws that secure the Separation Roller Assembly.
3. Slide the Separation Roller Assembly from Tray 2 and remove the
Separation Roller Assembly.

s6400mfp-673

8-26 WorkCentre 6400 Service Manual

Service Parts Disassembly

Tray 2 Feed Roller (PL21.27)

1. Fully open Tray 2 (PL21.28).

2. Press the Lifting Plate (PL21.23) down to lock it in place.
3. Remove the three K-Clips (PL21.29).

s6400mfp-674

4. Lift and slide the Shaft (PL21.24) toward the rear of the Tray.
5. Remove the Bushing (PL21.10).

s6400mfp-574

WorkCentre 6400 Service Manual 8-27

Service Parts Disassembly

6. Slide the Feed Roller out from the Shaft and remove the Feed Roller.

s6400mfp-576

Replacement Note
When installing the Feed Roller, be sure that the Feed Roller is
mounted in the direction as shown in the illustration.

Feed Roller

s6400mfp-347

Be sure the notch on the Clutch fits into the Feed Roller properly.

s6400mfp-575

8-28 WorkCentre 6400 Service Manual

Service Parts Disassembly

Tray 3/ Tray 4 Feed Roller (PL32.05)

1. Slide the paper Tray out.

2. Press the Lifting Plate (PL31.01) down to lock it in place.
3. Remove the 2 K-Clips, Spacer, and Bearing from the Shaft (PL32.17).

Note
Tray 3/4 K-Clips are not interchangeable with Tray 2 K-Clips.

Bearing K-Clip

K-Clip

Washer

s6400mfp-577

WorkCentre 6400 Service Manual 8-29

Service Parts Disassembly

4. Remove the K-Clip.

5. Slide the Feed Roller out from the Shaft and remove the Feed Roller.

s6400mfp-578

8-30 WorkCentre 6400 Service Manual

Service Parts Disassembly

Duplex Automatic Document Feeder (DADF)

DADF Separator (Feed) Roller Assembly (PL1.02)

1. Open the DADF Top Cover Assembly (PL1.05).

2. Pull the Lock Lever upward to unlock the DADF Separator Roller
Assembly.
3. Hold the DADF Separator Roller Assembly and slightly move it forward to
detach the Assembly.

Note
Do not lose the left and right yellow clips.

s6400mfp-481

WorkCentre 6400 Service Manual 8-31

Service Parts Disassembly

Replacement Note
Be sure to place the Separator Roller Assembly in the correct position
to prevent the it from misaligning.

Be sure to place the Orange levers on the DADF Separator Roller Assembly
behind the Roller.

s6400mfp-675

Be sure to push the Lock Lever in to lock the Separator Roller Assembly in
place.

3
1

s6400mfp-676

8-32 WorkCentre 6400 Service Manual

Service Parts Disassembly

DADF Paper Tray Assembly (PL1.04)

1. Press the left and right clip-joints of the DADF Paper Tray to release it
from the DADF Assembly.

s6400mfp-579

2. Disconnect the wiring harness cable underneath the DADF Paper Tray.
3. Loosen 1 screw that secures the Cover.
4. Remove 1 screw with washer that secure the Ground Cable.
5. Route the Ground wire out from underneath the cover.

Loosen Screw

s6400mfp-580

WorkCentre 6400 Service Manual 8-33

Service Parts Disassembly

6. Release the latches on the left and right side of the DADF Paper Tray and
remove the Tray.

s6400mfp-581

Replacement Note
Be sure to secure the left and right latches on the bottom of the DADF
Paper Tray in place and push the Tray forward to lock it in place.

Be careful not to trap the brush to prevent it from damage.

s6400mfp-582

8-34 WorkCentre 6400 Service Manual

Service Parts Disassembly

DADF Top Cover Assembly (PL1.05)

1. Remove the DADF Paper Tray (page 8-33).

2. Open the DADF Top Cover.
3. Remove 2 screws that secure the Front Cover.
4. Remove the Front Cover.
5. Remove 3 screws that secure the Rear Cover.
6. Press the Rear Cover inward and push it toward the left side to release
the 3 tabs to remove the Rear Cover.

Tabs Tab

Rear Cover

Front Cover s6400mfp-590

WorkCentre 6400 Service Manual 8-35

Service Parts Disassembly

7. Disconnect the 5 wiring harness connectors P/J3, P/J4, P/J5/ P/J6, and
P/J8.
8. Remove 1 screw that secures the Ground Wire and remove the Ground
Wire.

P/J4
P/J5

P/J8

P/J1

P/J6
P/J2
P/J3 s6400mfp-691

8-36 WorkCentre 6400 Service Manual

Service Parts Disassembly

9. Remove 2 screws (from the front) and 4 screws (from the rear) that
secure the DADF Top Cover Assembly.
10. Lift and remove the DADF Top Cover Assembly.

Front

s6400mfp-729

Rear

s6400mfp-728

WorkCentre 6400 Service Manual 8-37

Service Parts Disassembly

Duplex Automatic Document Feeder Assembly (PL1.06)

1. Open the Duplex Automatic Document Feeder (DADF) Assembly.

WorkCentre 6400 Service Manual 8-41

Service Parts Disassembly

Scanner Assembly

Scanner Assembly (PL2.01)

Caution
Use care when handling the DADF Assembly and Scanner Assembly to
prevent damaging the document glass.

1. Remove the DADF Assembly (page 8-38).

2. Remove the Rear Cover (page 8-47).
3. Disconnect the Scanner Assembly Cable.
4. Remove 1 screw that secures the Ground Wire.

s6400mfp-458

8-42 WorkCentre 6400 Service Manual

Service Parts Disassembly

5. Lift the rubber flap and remove 2 screws per side that secure the scanner
unit Left and Right Stoppers.
6. Remove the Stoppers.

s6400mfp-677

7. Open the Front Door (PL3.10).

Caution
Be sure to hold the Scanner Assembly while opening it to prevent the
Scanner Assembly from tilting and falling from the printer.

8. Press the DADF Interlock and lift the Control Panel to a vertical position.

Caution
Be careful not to drop the Upper Transport Assembly (PL17.37) while
opening the Scanner Assembly.

s6400mfp-641

WorkCentre 6400 Service Manual 8-43

Service Parts Disassembly

9. Disconnect the Scanner Power Cable.

s6400mfp-596

10. Remove the Upper Horizontal Transport Assembly (page 8-68).

11. Remove 4 screws that secure the Left and Right Hinges.

Left Hinge
Right Hinge

s6400mfp-597

8-44 WorkCentre 6400 Service Manual

Service Parts Disassembly

12. Slide the Scanner Assembly toward the rear of the printer and remove the
Scanner Assembly.

s6400mfp-463

Replacement Note
Be sure not to trap the wiring harness under the Scanner Assembly.

1. Slide the Scanner Assembly into the printer frame.

2. Install the Left and Right Hinges.
3. Install the 4 screws.
4. Lift the Control Panel.
5. Connect the Scanner Power Cable.
6. Push the Upper Transport Assembly upward and lock to the Scanner
Assembly.
7. Install the Left and Right Stoppers.
8. Install the 4 screws.

WorkCentre 6400 Service Manual 8-45

Service Parts Disassembly

Covers

Control Panel (PL2.12)

1. Open the DADF Assembly (page 8-38).

2. Remove 3 screws that secure the Control Panel.

s6400mfp-471

3. Disconnect the wiring harness connector.

4. Remove the Control Panel.

CN2

s6400mfp-678

8-46 WorkCentre 6400 Service Manual

Service Parts Disassembly

Rear Cover (PL3.02)

1. Remove the Hard Disk Drive (page 8-91), (steps 1 through 3).
2. Remove the 2 plastic screws (top) and 4 metal screws that secure the
Rear Cover.
3. Lift the Rear Cover up to release the latches and remove the Rear Cover.

T
M

s6400mfp-604

WorkCentre 6400 Service Manual 8-47

Service Parts Disassembly

Right Rear Cover (PL3.03)

1. Open the Front Door (PL3.10).

2. Lift the Control Panel.
3. Open the Right Door (PL15.01).
4. Release the hook that secures the Right Door to the printer and lower the
Right Door.

Hook

Front Door Assembly (PL3.10)

1. Open the Front Door.

2. Remove 1 screw that secures the Front Door and the Strap.
3. Remove the E-ring.
4. Slide the Front Door toward the left side and remove the Front Door.

s6400mfp-464

WorkCentre 6400 Service Manual 8-51

Service Parts Disassembly

Left Side Cover (PL3.26)

1. Open the Front Door (PL3.10).

2. Lift the Control Panel.
3. Remove the Finisher Assembly (page 8-182) (or the Standard Output
Tray).
4. Remove the Finisher Hooks (PL37.16).
5. Remove 6 screws that secure the Left Side Cover.

s6400mfp-602

6. Lift the bottom of the Left Side Cover and slide it outward and remove the
Left Side Cover.

s6400mfp-603

8-52 WorkCentre 6400 Service Manual

Service Parts Disassembly

Paper Trays

Tray 1 (PL5.12)

1. Open Tray 1.
2. Remove the Duplex Unit (page 8-175).
3. Disconnect the wiring harness connector CN15.
5. Move the 2 Lock Levers upward to release Tray 1.
6. Remove Tray 1.

CN15

s6400mfp-348

2. Press the latches, push the Sensor toward the right side to release the
hook, and remove the Sensor Bracket (PL9.14) from the printer frame.

Latch

Hook

s6400mfp-805

3. Disconnect the wiring harness connector.

4. Remove the Tray 2 Paper Empty Sensor.

1. Remove the Main Drive Assembly (page 8-142).

2. Remove 3 screws that secure the Bracket.
3. Remove the two E-Rings and two Bushings (PL12.05).
4. Remove the Pressure/ Retraction Clutch-1 Assembly.

E-Ring

Bushing

Bushing
E-Ring

s6400mfp-806

WorkCentre 6400 Service Manual 8-59

Service Parts Disassembly

1. Open the Right Door (Vertical Transport Assembly) (PL15.01).

2. Unhook the tab on the top side of the Set Plate (PL16.04) and remove the
Plate.
3. Remove the E-ring and the Roll (PL16.12).

Tab E-Ring

s6400mfp-810

4. Disconnect the wiring harness connector CN16.

5. Remove the Registration Clutch.

Notch

CN16
s6400mfp-811

WorkCentre 6400 Service Manual 8-63

Service Parts Disassembly

Replacement Note
When installing the bearing, make sure to position the notch on the
Registration Clutch in place as in the illustration.

Notch

CN16
s6400mfp-843

8-64 WorkCentre 6400 Service Manual

Service Parts Disassembly

Registration Roller Assembly (PL16.22)

1. Open the Tray 3 Lower Right Door (if the 500-Sheet Feeder is installed).
2. Open the Right Door (PL15.01).

Caution
Do not touch the foam rubber of the Transfer Roller to prevent print
defects.

3. Remove the Transfer Roller (page 8-23).

4. Release the hook that secures the Right Door to the printer and lower the
Right Door.
5. Remove 2 screws that secure the Right Door.

s6400mfp-812

WorkCentre 6400 Service Manual 8-65

Service Parts Disassembly

6. Unhook the tab on the top side of the Set Plate (PL16.04) and remove the
Plate.
7. Disconnect the wiring harness connector CL2 from CN16.

Tab

s6400mfp-844

Caution
Be careful not to lose the pin.

8. Remove the pin (one on each side).

9. Rotate the Holder 90° clockwise (vertical position) and slide the Shaft out
through the Registration Roller Assembly toward the front.

Caution
Be careful not to lose the springs.

Holder

s6400mfp-813

8-66 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
Be sure the springs sit in the correct places. One side has a Ground
Spring, one side has flat surface.

Be sure the Ground Plate (on the front side of the printer) sits on the inside.
Push the Registration Roller Assembly downward while aligning the hole and
installing the shaft.
Be sure the plastic Bracket aligns with the boss.
Be sure the Registration Assembly moves up and down.

Ground
Spring

Post s6400mfp-847

WorkCentre 6400 Service Manual 8-67

Service Parts Disassembly

Upper Horizontal Transport Assembly (PL17.37)

1. Remove the Scanner Assembly (page 8-42).

2. Open the Upper Horizontal Transport upward and remove the Upper
Horizontal Transport Assembly.

s6400mfp-682

8-68 WorkCentre 6400 Service Manual

Service Parts Disassembly

Lower Horizontal Transport Assembly (PL17.48)

1. Remove the Upper Horizontal Transport Assembly (page 8-68).

2. Remove the Fuser Unit (page 8-24).
3. Disconnect the Paper Exit Assembly wiring harness connector.

Note
For the following step, be sure to remove the bottom screws first to
prevent the Paper Exit Assembly from falling.

4. Remove 6 screws that secure the Brackets (PL10.18) to the Frame.

5. Remove the Paper Exit Assembly.

s6400mfp-692

6. Loosen the 2 front screws.

7. Remove 7 screws that secure the Lower Horizontal Transport Assembly.
8. Lift the Lower Horizontal Transport Assembly and remove the Lower
Horizontal Transport Assembly.

Loosen

Loosen
s6400mfp-608

WorkCentre 6400 Service Manual 8-69

Service Parts Disassembly

Replacement Note
Be sure to position the Ground Spring in the correct position to
prevent from damage.

Be sure to properly align the Scanner Latch (PL4.04) when

reinstalling the Lower Horizontal Transport Assembly.

8-70 WorkCentre 6400 Service Manual

Service Parts Disassembly

Fuser Pawl (PL18.04)

1. Open the Tray 3 Right Door (if the 500-Sheet Feeder is installed).
2. Remove the Fuser Unit (page 8-24).
3. Push the Duplex Hook upward to release the hook from the printer and
lower the Right Door.
4. Remove 2 screws that secure the Right Door.

Note
Use a stubby screwdriver for the following step.

5. Remove 1 screw from the bottom of the Fuser Pawl.

Pawls

s6400mfp-900

6. Remove the Fuser Pawl.

s6400mfp-803

WorkCentre 6400 Service Manual 8-71

Service Parts Disassembly

Paper Exit Assembly (PL19.25)

1. Remove the Left Side Cover (page 8-52).

2. Disconnect the Paper Exit Assembly wiring harness connector.

s6400mfp-614

3. Remove 2 screws that secure the Paper Exit Assembly to the Brackets
(PL10.18).
4. Remove the Paper Exit Assembly.

s6400mfp-683

Replacement Note
Be sure to connect the Exit Assembly wiring harness connector.

8-72 WorkCentre 6400 Service Manual

Service Parts Disassembly

Tray 2 Separation Roller Clutch (PL21.26)

1. Remove Tray 2 (page 8-58).

2. Press the Lifting Plate (PL21.23) down to lock it in place.
3. Remove the three K-Clips (PL21.29).

s6400mfp-674

4. Slide the Shaft (PL21.24) toward the rear of the Tray.

5. Remove the Bushing (PL21.10).

s6400mfp-574

WorkCentre 6400 Service Manual 8-73

Service Parts Disassembly

6. Slide the Feed Roller out from the Shaft and remove the Feed Roller.

s6400mfp-576

7. Slide the Tray 2 Separation Roller Clutch out and remove the Tray 2
Separation Roller Clutch.

s6400mfp-797

8-74 WorkCentre 6400 Service Manual

Service Parts Disassembly

Electrical

Control Panel PWB (PL2.14-15), Control Panel LCD Assembly (PL2.16), Ribbon
Cables (PL2.17-19)

1. Open the Front Door (PL3.10).

2. Lift the Control Panel.
3. Remove 3 metal screws that secure the Control Panel.

s6400mfp-471

4. Remove 1 plastic screw that secures the Ground Wire and 1 screw that
secures the wiring harness.
5. Disconnect the wiring harness connector.

s6400mfp-730

WorkCentre 6400 Service Manual 8-75

Service Parts Disassembly

6. Remove the Control Panel.

7. Turn the Control Panel over to its back side.
8. Disconnect the 3 ribbon cables.
a. Ribbon Cable, Board Connector (PL2.17)
b. Ribbon Cable, Video (PL2.18)

Ribbon Cable, Board Connector

Ribbon Cable, Video

s6400mfp-482

9. Remove 9 screws that secure the Bracket.

s6400mfp-483

8-76 WorkCentre 6400 Service Manual

Service Parts Disassembly

10. Lift the Bracket to remove it and turn the Control Panel over.
■ For LCD Assembly removal, go to step 11.
■ For PWB removal, go to step 13.
11. Remove 4 screws that secure the LCD Assembly.
12. Remove the LCD Assembly.

s6400mfp-721

Note
Be sure to perform the Touch Panel Calibration routine (”Control Panel
Diagnostics” on page 6-22) after replacing the LCD Assembly.

13. Remove the appropriate PWB.

s6400mfp-722

WorkCentre 6400 Service Manual 8-77

Service Parts Disassembly

Replacement Note
Be sure to position the cable holder in place to prevent the Control
Panel from sitting unevenly.

s6400mfp-798

8-78 WorkCentre 6400 Service Manual

Service Parts Disassembly

Toner Low Sensor Board (TLSB) Assembly (PL6.18)

Caution
Observe all ESD procedures to avoid component damage.

1. Open the Front Door (PL3.10).

2. Remove the Toner Cartridges (Y/M/C/K) (page 8-15).

Caution
Be sure to place the Imaging Units in black plastic bags or store them in a
dark place. Do not expose the Imaging Unit to light for an extended period
of time.

3. Remove the Imaging Units (Y/M/C/K) (page 8-17).

4. Remove the Waste Cartridge (page 8-19).
5. Remove the Rear Cover (page 8-47).
6. Remove the Right Front Cover (page 8-50).
7. Remove the Left Side Cover (page 8-52).
8. Remove the Scanner Assembly (page 8-42).
9. Remove the LVPS Shield (page 8-82, steps 1-8).
10. Disconnect the wiring harness connector P/J13 from the MCU Board
(PL20.09).

P/J13

and release the wiring harness from both clips.

Wire Clips

P/J34

s6400mfp-717

8-82 WorkCentre 6400 Service Manual

Service Parts Disassembly

7. Remove 11 screws that secure the LVPS Shield (PL10.02). Note the
location of the two panhead screws.

Caution
Be careful when removing the LVPS Shield to prevent damaging the
Sensor Flag.

8. From the left of the printer, pry the LVPS Shield to release the 2 bosses
on the printer frame. Slide the Arm (PL4.02) towards the front of the
printer, lift and remove the LVPS Shield.

8 mm

Boss

Boss
s6400mfp-718

9. Disconnect the 7 wiring harness connectors on the LVPS.

10. Disconnect the 7 connectors from the LVPS.
11. Remove 10 screws that secure the LVPS.
12. Lift and remove the LVPS.

s6400mfp-617

WorkCentre 6400 Service Manual 8-83

Service Parts Disassembly

Temperature/ Humidity Sensor (PL11.01)

Caution
Observe all ESD procedures to avoid component damage.

1. Open the Right Door (PL15.1).

2. Remove 1 screw that secures the Guide Plate (PL11.7).
3. Shift the Guide Plate toward the left and remove the Guide Plate.

s6400mfp-696

4. Disconnect the wiring harness connector.

5. Remove 1 screw that secures the Temperature/ Humidity Sensor.
6. Remove the Temperature/ Humidity Sensor.

s6400mfp-526

8-84 WorkCentre 6400 Service Manual

Service Parts Disassembly

Registration Sensor (PS9) (PL11.04)

1. Open the Right Door (PL15.01).

2. Remove 1 screw that secures the Guide Plate (PL11.07).
3. Shift the Guide Plate toward the left and remove the Guide Plate.

s6400mfp-696

4. Disconnect the wiring harness connector P/J7.

5. Release the clips on the Registration Sensor from the Guide Plate and
remove the Registration Sensor.

P/J7

s6400mfp-697

WorkCentre 6400 Service Manual 8-85

5. Release the IDCSB Shutter Spring (PL14.15) from the Guide.

Spring

s6400mfp-701

6. Disconnect the wiring harness connector.

7. Remove 2 screws that secure the Image Density Control Sensor Board.
8. Remove the Image Density Control Sensor Board.

P/J8

P/J9

s6400mfp-702

8-88 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
The Image Density Control Sensor Boards are interchangeable. Be
sure to perform installation from the left side toward the right side.

Be sure the Spring’s hook faces downward when installing the Guide and
rotate the latch toward you.

Spring

s6400mfp-701

Be sure the shutter sits inside the Image Density Control Sensor Board Guide
flange.

s6400mfp-840

WorkCentre 6400 Service Manual 8-89

Service Parts Disassembly

Be sure to secure the 2 hooks on the IDCS Board Holder in the holes.

s6400mfp-839

8-90 WorkCentre 6400 Service Manual

Service Parts Disassembly

Hard Disk Drives (PL20.03)

Caution
The Hard Disk Drives are susceptible to ESD damage. Observer proper
ESD precautions.

Do not use another Hard Disk Drive from another printer.

1. Loosen 1 screw that secures the Rear Cover Access Door and open the
Door.

Note
If possible, create a Clone .dlm file (All Features) from CWIS prior to
replacing the Hard Drives. If the printer is down, ask the customer if they
have a Clone file available.

Download the Clone file to the printer after the Hard Drives have been
replaced in order to restore the customer printer settings.

s6400mfp-684

WorkCentre 6400 Service Manual 8-91

Service Parts Disassembly

2. Disconnect the wiring harness connectors from the Hard Disk Drives.

s6400mfp-685

Be sure to handle the Hard Drives with care. Do not press on the Hard Disk
Drive when installing it. Do not cover the breathing hole on the Hard Drive.

Hole

s6400mfp-925

■ NVM Module (page 8-116)
■ RAM DIMM’s (page 8-117)
■ NVRAM Chip

Notches

s6400mfp-703

Note
Do not remove the SATA Board or the Fax Board.

NVRAM Chip
P/J103 P/J208

SATA Board

NVM Module FAX Board

s6400mfp-690

Replacement Note
Be careful when connecting the two ribbon cables to prevent
damaging the cables. Be sure to lock the 2 locking connectors when
reattaching the ribbon cables to the Board.

8-100 WorkCentre 6400 Service Manual

Service Parts Disassembly

MCU Board (Engine Control Board) (PL20.09)

Caution
Observe all ESD procedures to avoid component damage.

Caution
Do not remove the following components at the same time to prevent mis-
connecting the wiring harness connectors and misplacing components.

■ I/P Board
■ MCU Board
1. Remove the Right Rear Cover (page 8-48).
2. Remove the RF Protective Shield (page 8-97).
3. Disconnect the scanner assembly cable from the printer.
Note
You may need to use a short screwdriver to remove the bottom left screw.

4. Remove 8 screws that secure the Panel (PL20.14) and remove the Panel.

s6400mfp-723

WorkCentre 6400 Service Manual 8-101

Service Parts Disassembly

Caution
Be careful when disconnecting the wiring harness connectors to prevent
damage.

5. Release the wiring harnesses from the clamps.

6. P/J 23 & P/J 24 (Black connectors) need to be unlocked prior to removing
the ribbon cables. P/J 17 & P/J 18 (White connectors) are non-locking.
Release the lock, as necessary, and disconnect the ribbon cables from
the MCU Board.
7. Disconnect all the wiring harness connectors from the MCU Board.

P/J34 P/J4 P/J3 P/J31 P/J1 P/J39 P/J2 P/J9 P/J7

P/J38 P/J27

P/J14

P/J13
P/J8
P/J21
P/J33
P/J29 P/J36

P/J19

P/J37 P/J24
P/J12
P/J26 P/J30 (N.C.)
P/J5
P/J11
P/J25

P/J6
P/J16
P/J10

P/J15
P/J28
P/J18
P/J20 P/J35 P/J17
Clamp P/J23 P/J22 s6400mfp-618

8-102 WorkCentre 6400 Service Manual

Service Parts Disassembly

8. Remove 8 screws that secure the MCU Board.

9. Shift the MCU Board at an angle away from the wiring harness clamps
and remove the MCU Board.

s6400mfp-619

WorkCentre 6400 Service Manual 8-103

Service Parts Disassembly

10. Remove the NVRAM (IC4) from the MCU Board.

NVRAM

s6400mfp-620

Replacement Note
When replacing the MCU Board, be sure to remount the NVRAM
(IC4). Remove the NVRAM (IC4) from the old MCU Board and install
it on the new MCU Board.

Rotate the chip with the notch side facing left. When installing the NVRAM
(IC4), be sure the notches “A” are lined up.
Be sure to verify all the connections.

Notches

s6400mfp-703

8-104 WorkCentre 6400 Service Manual

Service Parts Disassembly

Be sure to connect the 3 ribbon cables correctly to prevent damaging the

cables.

■ P/J24 - blue side of the ribbon cable faces left

■ P/J17 - blue side of the ribbon cable faces upward

■ P/J23 - green side of the ribbon cable faces upward

P/J24

P/J30
(N.C.)

P/J17

P/J23

s6400mfp-890

Replacement Note
Remember to lock P/J17, P/J23 & P/J24 connectors after re-installing
the ribbon cables. P30 does not have a connection.

WorkCentre 6400 Service Manual 8-105

Service Parts Disassembly

High Voltage Power Supply-1 (PL20.16)

Caution
Observe all ESD procedures to avoid component damage.

1. Remove the Card Cage (page 8-111); turn the Card Cage over and lay it
on top of the printer.
2. Release the wiring harnesses from the clips.

Note
Be sure to keep the tape in the following step for re-installation.

3. Remove the tape from the Laser Unit ribbon cable and remove the cable
from the Harness Plate (PL20.41).
4. Remove 2 screws that secure the Harness Plate.
5. Shift the Harness Plate at an angle toward the rear of the printer and
remove the Harness Plate.

s6400mfp-621

8-106 WorkCentre 6400 Service Manual

Service Parts Disassembly

6. Unhook the 12 Springs.

7. Remove 2 screws that secure the HVPS-1.

Springs

s6400mfp-622

8. Remove the HVPS-1 and the Cover (PL20.22).

9. Disconnect the Ribbon Cable Harness Assembly (PL20.17) from the
HVPS-1.

Note
Be sure to move the Ribbon Cable to the new HVPS-1.

10. Remove 2 screws that secure the HVPS-1 to the Cover (PL20.22).
11. Remove the HVPS-1 from the Cover.

s6400mfp-719

WorkCentre 6400 Service Manual 8-107

Service Parts Disassembly

Replacement Note
Be sure to install the ribbon cable with the blue stripes facing toward
the left side of the printer (from the rear). Be careful not to touch the
resistors when installing the Harness Plate.

Be sure to position the HVPS-1 under the metal tab.

s6400mfp-799

8-108 WorkCentre 6400 Service Manual

Service Parts Disassembly

High Voltage Power Supply-2 (PL20.21)

Caution
Observe all ESD procedures to avoid component damage.

1. Remove the HVPS-1 (page 8-106).

2. Disconnect all wiring connectors and 1 Ribbon Cable (PL20.18) from the
High Voltage Power Supply-2 (HVPS-2).

s6400mfp-623

3. Remove 2 screws that secure the HVPS-2.

4. Lift and remove the HVPS-2.

s6400mfp-624

WorkCentre 6400 Service Manual 8-109

Service Parts Disassembly

Replacement Note
When reinstalling the HVPS-2, be sure to connect each color-coded
wiring connector in the correct place. Refer to ”Map 3 - HVPS-2
(HV2)” on page 10-20.

s6400mfp-625

Be sure to place the Laser Unit ribbon cable on top of the Harness Plate
(PL20.41).

s6400mfp-800

8-110 WorkCentre 6400 Service Manual

Service Parts Disassembly

Card Cage (PL20.27)

1. Remove the Left Side Cover (page 8-52).

2. Remove the Scanner Assembly (page 8-42).
3. Remove the Upper Horizontal Transport Assembly (page 8-68).
4. Remove the Lower Horizontal Transport Assembly (page 8-69).
5. Remove the Image Processor Board (page 8-98).
6. Remove the MCU Board (page 8-101).
7. Remove 4 screws that secure the Fan Duct (PL20.10).
8. Release the tab from the Card Cage then route the wiring harness
through the hole and remove the Fan Duct.

s6400mfp-629

9. Remove 1 screw that secures the wiring harness.

10. Release the black wiring harness clip.

s6400mfp-630

WorkCentre 6400 Service Manual 8-111

Service Parts Disassembly

11. Remove 4 screws that secure the Left Scanner Hinge Bracket (PL2.08).
12. Remove the Left Scanner Bracket.

Left Scanner Bracket

s6400mfp-631

13. Remove 2 screws that secure the Bracket (PL20.26) and 1 screw that
secures the Card Cage.

s6400mfp-707

8-112 WorkCentre 6400 Service Manual

Service Parts Disassembly

14. Remove 15 screws that secure the Card Cage.

15. Route the wiring harnesses through the hole and remove the Card Cage.

s6400mfp-705

Replacement Note
Be sure to secure the Laser Unit ribbon cable on top of the Harness
Plate (PL20.41).

s6400mfp-800

WorkCentre 6400 Service Manual 8-113

Service Parts Disassembly

Be sure to route the Controller Board Fan wiring harness connector through
the hole of the Fan Duct (PL20.10).

s6400mfp-801

Be sure to route the Laser Unit ribbon cable through the hole in the bottom of
the Card Cage.

s6400mfp-802

8-114 WorkCentre 6400 Service Manual

Service Parts Disassembly

Fax Board (PL20.42)

Caution
Observe all ESD procedures to avoid component damage.

1. Remove the Rear Cover (page 8-47).

2. Carefully use a non-sharp non-metallic object to pry the Fax Board from
the I/P Board and remove the Fax Board.

Pry Points

s6400mfp-761

Replacement Note
Be sure to align the pins on the Fax Board with the holes on the I/P
Board to prevent damaging the pins.

s6400mfp-892

WorkCentre 6400 Service Manual 8-115

Service Parts Disassembly

NVM Module (PL20.43)

Caution
Observe all ESD procedures to avoid component damage.

1. Remove the Rear Cover (page 8-47).

2. Remove 1 screw that secures the NVM Module.
3. Carefully use a non-sharp non-metallic object to pry the NVM Module
from the I/P Board and remove the NVM Module.

Lift Points
s6400mfp-762

Replacement Note
Need to perform a “Restore” function after the NVM Module is
replaced in order to retain critical customer and system parameters.

8-116 WorkCentre 6400 Service Manual

Service Parts Disassembly

RAM (PL20.44)

Caution
Observe all ESD procedures to avoid component damage.

1. Remove 1 screw that secures the Rear Cover Access Door and open the
Door.

s6400mfp-684

2. Release the clips that secure the RAM.

3. Lift the RAM and slide it downward at angle and remove the RAM.

s6400mfp-763

WorkCentre 6400 Service Manual 8-117

Service Parts Disassembly

Replacement Note
Be sure to position the RAM in place and lock the 2 clips.

s6400mfp-764

8-118 WorkCentre 6400 Service Manual

Service Parts Disassembly

Xerographics

CRUM Reader (PL6.02)

1. Remove the LVPS (page 8-82).

2. Remove 2 screws that secure the CRUM Cover (PL6.03).
3. Remove 1 screw that secures the Bracket (PL10.06).
4. Lift and remove the Bracket.

Bracket

s6400mfp-708

WorkCentre 6400 Service Manual 8-119

Service Parts Disassembly

5. Remove the CRUM Reader Assembly from the LVPS Shield (PL10.02).

Tab

s6400mfp-709

6. Use a screw driver to release the clips from the CRUM Cover (PL6.03).
7. Disconnect the CRUM Reader connector from the Bracket.
8. Carefully press the tabs to release the CRUM Reader from the Bracket.
9. Gently disconnect the CRUM Reader from the connector.

Bracket
P/J22 P/J23 P/J24

P/J25

Cover s6400mfp-710

8-120 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note

1. Be sure to align the two bosses when installing the CRUM Reader.

Bosses

s6400mfp-711

2. Be careful not to bend the 3 pins when installing the CRUM Reader.

s6400mfp-731

3. Make sure the connector is fully seated to the connector.

4. Reinstall the Cover into the Bracket.

WorkCentre 6400 Service Manual 8-121

Service Parts Disassembly

5. Be sure to position the tab on the bottom of the CRUM Reader under the
LVPS Housing and verify that the CRUM Reader is secured in place. Be
sure the tab on the right side of the CRUM Reader Bracket is properly in
place ensuring the Bracket is flush against the housing.

Tab

s6400mfp-709

6. Verify that the CRUM Reader is aligned on the inside of the printer (at the
Black Toner Cartridge area).

Black CRUM Tab

s6400mfp-732

Note
Error message “Install Black Toner Cartridge” may display when the tab
does not sit in the correct position.

8-122 WorkCentre 6400 Service Manual

Service Parts Disassembly

Waste Toner Auger Assembly (PL8.21)

Caution
Be sure to place the Imaging Units in plastic bags or store them in a dark
place. Do not expose the Imaging Units to light for an extended period of
time.

1. Remove 1 screw that secures the Waste Toner Auger Assembly.

2. Remove the Waster Toner Auger Assembly.

1. Open the Front Door (PL3.10).

2. Remove the Fuser Unit (page 8-24).

Caution
Be sure to place the Imaging Units in black plastic bags or store them in a
dark place. Do not expose the Imaging Units to light for an extended
period of time.

3. Remove the Transfer Belt (page 8-20).

4. Remove the Card Cage (page 8-111).
5. Remove the wiring harness and ribbon cable from the Harness Plate
(PL20.41).

s6400mfp-741

Note
Do not tilt the Waste Cartridge inlet when removing the Waste Toner
Auger Assembly. The Waste Toner Auger Assembly should be kept with
the port up to prevent toner leakage.

6. Remove the Waste Toner Auger Assembly (page 8-123).

7. Remove 4 screws that secure the Imaging Unit Rails.

8-126 WorkCentre 6400 Service Manual

Service Parts Disassembly

8. Remove the 4 Imaging Unit Rails.

■ Gray Rail (PL9.06): Black (located on the far right side
■ Black Rails (PL9.07): Color

s6400mfp-742

9. On the Heat Shield Cover, locate the perforated access holes and push
downward to allow access to the 2 right side Laser screws.

s6400mfp-893

WorkCentre 6400 Service Manual 8-127

Service Parts Disassembly

10. Peel the tape with the gasket to access the left side screw.
11. Remove 3 screws (flat head) that secure the Laser Unit.

s6400mfp-755

8-128 WorkCentre 6400 Service Manual

Service Parts Disassembly

12. Remove the tape from the ribbon cable.

13. Feed the ribbon cable and wiring harness through the top and bottom
holes.
Note
Be sure to save the tape for re-installation.

Top Hole

Bottom Hole
s6400mfp-756

Caution
Do not touch the lens on the bottom of the Laser Unit to prevent damaging
the Laser Unit.

14. Pull the Laser Unit out to remove it from the printer.

s6400mfp-757

WorkCentre 6400 Service Manual 8-129

Service Parts Disassembly

Replacement Note
Perform the following procedures when installing the Laser Unit to
prevent damaging it.

1. Remove the shipping tape on the new Laser Unit Shield Sheet.

s6400mfp-758

2. Unfold the rectangular area of the Shield Sheet so that the part is lying
flat.
3. Insert the Laser Unit into the printer at an angle. Place the Laser Unit at
an angle in order to feed the ribbon cables through the hole.
4. Insert the ribbon cable through the bottom hole and the wiring harness
through the top hole and route the wiring harness and ribbon cable to the
rear of the printer.

Top Hole

Bottom Hole
s6400mfp-756

8-130 WorkCentre 6400 Service Manual

12. Install the Waste Toner Auger Assembly into the main body of the printer.
a. Turn the connector so that it sits in vertical direction.

s6400mfp-769

WorkCentre 6400 Service Manual 8-133

Service Parts Disassembly

b. Be sure to turn the middle Drive Gear so the Rear Gear keeps its own
rectangular slot in the proper direction relative to the motor.

s6400mfp-766

13. While pushing the positioning protrusion of the Waste Toner Auger
Assembly against the housing, secure the Waste Toner Auger Assembly
with 1 screw.

Note
Verify that the two Drive Gears of the Waste Cartridge Auger Assembly
are engaged.

s6400mfp-767

8-134 WorkCentre 6400 Service Manual

Service Parts Disassembly

Drive Assembly

Pressure/ Retraction Sensor 2 (PS13) (PL11.4)

Caution
Be sure to place the Imaging Units in plastic bags or store them in a dark
place. Do not expose the Imaging Units to light for an extended period of
time.

1. Remove the Transfer Belt (page 8-20).

2. Use a small screwdriver to release the latch on the Sensor from the
Sensor Holder.
3. Disconnect the wiring harness connector P/J13 and remove the
Retraction/Pressure Sensor.

P/J13

s6400mfp-768

WorkCentre 6400 Service Manual 8-135

Service Parts Disassembly

2nd Image Transfer Pressure/ Retraction Drive Assembly (PL11.8)

1. Remove the Right Front Cover (page 8-50).

2. Open the Front Door (PL3.10).
3. Remove the Transfer Belt (page 8-20).

Note
For the following step, be sure to mark the gray wiring harness (bundled
on the left side) for re-assembly.

4. Disconnect the 10 wiring harness connectors.

5. Remove the wiring harnesses from the retainers.

MS4

MS2

P/J3
CN17

P/J10
P/J11
MS3

Tape (or other marking method) s6400mfp-838

8-136 WorkCentre 6400 Service Manual

Service Parts Disassembly

6. Remove the Image Density Control Sensor Board (page 8-87).

7. Remove the Cam and Gear.

s6400mfp-833

8. Remove 3 screws that secure the 2nd Image Transfer Pressure/

Retraction Drive Assembly.
9. Shift the Drive Assembly toward the right and remove the Drive Assembly.

Caution
Be sure to clear the Drive Assembly away from the Front Door Sensor.

Front Door Sensor

s6400mfp-841

WorkCentre 6400 Service Manual 8-137

Service Parts Disassembly

Replacement Note
Be sure to fit the Interlock Spring into the slot.

Interlock Spring s6400mfp-845

Be sure to connect the gray wiring harness connector correctly (the marked
gray wiring harness connects to the connector on the left side).
Be sure to connect the 10 wiring harness connectors and route them in the
correct places.

MS4

MS2

P/J3
CN17

P/J10
P/J11
MS3

Tape (or other marking method) s6400mfp-838

8-138 WorkCentre 6400 Service Manual

Service Parts Disassembly

Paper Take-Up Drive Assembly (PL12.15)

1. Remove the Card Cage (page 8-111).

2. Disconnect the white (CN12) and blue (CN11) wiring harness connectors.

CN11

CN12

s6400mfp-772

WorkCentre 6400 Service Manual 8-139

Service Parts Disassembly

9. Remove the wiring harness from the two wire clamps.

CN17 P/J16

Wire Clamps s6400mfp-776

Caution
Do not remove the 4 red screws that secure the motor.

10. Remove 7 screws that secure the Main Drive Assembly.

11. Remove the Main Drive Assembly.

s6400mfp-781

WorkCentre 6400 Service Manual 8-143

Service Parts Disassembly

Hopper Drive Assembly (PL13.20)

1. Remove the DC Power Supply Fan (page 8-148).

2. Remove the Main Drive Assembly (page 8-142).
3. Remove 4 screws that secure the Bracket (PL13.01).
4. Remove the Bracket.
5. Disconnect the wiring harness connector.

s6400mfp-782

6. Remove 2 screws that secure the Fan Duct (PL13.03).

7. Turn the Fan Duct over and place it on top of the printer frame.

s6400mfp-783

8-144 WorkCentre 6400 Service Manual

Service Parts Disassembly

8. Remove 6 screws that secure the Hopper Drive Assembly.

9. Remove the Hopper Drive Assembly.

s6400mfp-784

WorkCentre 6400 Service Manual 8-145

Service Parts Disassembly

Fans and Motors

Ozone Ventilation Fan (FM13) (PL7.20)

1. Remove the Card Cage (page 8-111).

P/J37

s6400mfp-792

4. Remove 4 screws that secure the LVPS Cooling Fan.

5. Slide the Cooling Fan out from the Fan Duct (PL20.10) and remove the
Cooling Fan.

s6400mfp-793

8-152 WorkCentre 6400 Service Manual

Service Parts Disassembly

I/P Board Cooling Fan (FM15) (PL20.11)

1. Remove the Lower Horizontal Transport Assembly (page 8-69).

2. Remove the RF Protective Shield (page 8-97).
3. Remove 4 screws that secure the Fan Duct (PL20.10).
4. Remove the Fan Duct.

s6400mfp-629

5. Disconnect the fan wiring harness connector P/J202 from the I/P Board.

Developer Motor K (M5) (PL12.02)

1. Remove the Card Cage (page 8-111).

2. Disconnect the wiring harness connector P/J21.
3. Remove 4 screws that secure the Black Developer Motor.
4. Remove the Black Developer Motor.

P/J21

s6400mfp-778

Replacement Note
Be sure to insert the motor straight in. Be careful not to damage the
gears.

8-156 WorkCentre 6400 Service Manual

Service Parts Disassembly

Intermediate Transport Motor (M1) (PL12.02)

1. Remove the Card Cage (page 8-111).

2. Disconnect the wiring harness connector P/J15.
3. Remove 4 screws that secure the Intermediate Transport Motor.
4. Remove the Intermediate Transport Motor.

P/J15

s6400mfp-779

Replacement Note
Be sure to insert the motor straight in. Be careful not to damage the
gears.

WorkCentre 6400 Service Manual 8-157

Service Parts Disassembly

Fuser Motor (M2) (PL12.04)

1. Remove the Card Cage (page 8-111).

2. Disconnect the wiring harness connector P/J17.
3. Remove 4 screws that secure the Fuser Motor.
4. Remove the Fuser Motor.

P/J17 s6400mfp-780

Replacement Note
Be sure to insert the motor straight in. Be careful not to damage the
gears.

8-158 WorkCentre 6400 Service Manual

Service Parts Disassembly

Toner Supply Motor (Y/M) (M6) (PL13.22)

1. Remove the Card Cage (page 8-111).

2. Disconnect the wiring harness connector P/J21.
3. Remove 2 screws that secure the Y/M Toner Supply Motor.
4. Remove the Y/M Toner Supply Motor.

P/J21

s6400mfp-795

Replacement Note
Be sure to insert the motor straight in. Be careful not to damage the
gears.

WorkCentre 6400 Service Manual 8-159

Service Parts Disassembly

Toner Supply Motor (C/K) (M7) (PL13.22)

8. Lift the Actuator out at an angle to release it from the tabs on the Bracket
(PL28.15).

s6400mfp-816

8-164 WorkCentre 6400 Service Manual

Service Parts Disassembly

Tray 3/ Tray 4 Paper Size Switch (PL28.14)

1. Remove the Tray 3/ Tray 4 Paper Size Switch Actuator (page 8-163).
2. Disconnect the wiring harness connector.
3. Release the latches on the Tray 3/ Tray 4 Paper Size Switch from the
frame and remove the Paper Size Switch.

1. Remove the printer from the Lower Feeder Unit (page 8-161).
2. Remove Tray 3/ Tray 4 (page 8-172).
3. Remove 1 screw that secures the Bracket (PL29.17).

s6400mfp-820

4. Lift the Bracket and the Tray 3/ Tray 4 Paper Feed Sensor Actuator.
5. Disconnect the wiring harness connector.
6. Release the Tray 3/ Tray 4 Paper Feed Sensor Actuator from the Bracket.

s6400mfp-832

8-168 WorkCentre 6400 Service Manual

Service Parts Disassembly

Tray 3/ Tray 4 Paper Feed Clutch-1 (CL6) (PL30.03)

Caution
Observe all ESD procedures to avoid component damage.

Warning
Two people are required to move the printer from the Lower Tray
Assemblies. Use safety lifting and handling techniques when moving the
printer.

1. Remove the Optional 500-Sheet Feeder (page 8-166).

2. Remove the LTA Circuit Board (page 8-161).
3. Remove 4 screws that secure the Guide Plate (PL29.10).
4. Release the wiring harness from the wiring harness clips.
5. Disconnect the 4 wiring harness connectors.
6. Remove the Paper Feed Drive Assembly.

s6400mfp-911

WorkCentre 6400 Service Manual 8-169

Service Parts Disassembly

7. Remove 2 screws that secure the Paper Feed Clutch Bracket (PL30.02).

Note
Be sure to hold the gear on the bottom of the paper Feed Clutch-1 to
prevent the gear from coming loose.

8. Remove the E-ring, Bushing (PL30.01), and the Paper Feed Clutch.

Bushing

E-Ring

s6400mfp-895

Replacement Note
When installing the paper Feed Clutch-1, be sure to position the
protrusion on the Paper Feed Clutch into the locking slots.

Slots s6400mfp-898

8-170 WorkCentre 6400 Service Manual

Service Parts Disassembly

Transport Motor (M16) (PL30.12)

1. Remove the Paper Feed Clutch (page 8-169).

2. Remove 3 screws that secure the Transport Motor Assembly.
3. Remove the Transport Motor Assembly.

s6400mfp-899

4. Remove the Gear (PL30.14).

5. Remove 2 screws that secure the Bracket (PL13.13).
6. Remove the Transport Motor from the Bracket.

s6400mfp-905

WorkCentre 6400 Service Manual 8-171

Service Parts Disassembly

Tray 3/ Tray 4 (PL31.24)

1. Slide the paper Tray out.

2. Remove 2 screws that secure the Stopper.
3. Press the tab on the paper Tray to release the Tray.

s6400mfp-903

8-172 WorkCentre 6400 Service Manual

Service Parts Disassembly

Duplex

Duplex Unit Right Cover (PL22.12)

1. Remove the Duplex Unit (page 8-175).

2. Remove 2 screws that secure the Right Cover.
3. Remove the Right Cover.

s6400mfp-904

WorkCentre 6400 Service Manual 8-173

Service Parts Disassembly

Duplex Unit Reverse Motor (M9) (PL22.13)

1. Remove the Duplex Unit (page 8-175).

2. Remove the Duplex Unit Right Cover (page 8-173).
3. Remove the Film Cover.
4. Disconnect the wiring harness connector P/J23.
5. Remove 2 screws that secure the Reverse Motor.
6. Remove the Reverse Motor.

P/J23
s6400mfp-906

Replacement Note
Be sure the lip on the rear of the Reverse Motor sits in the hole in
order to align the gears.

8-174 WorkCentre 6400 Service Manual

Service Parts Disassembly

Duplex Unit (PL22.23)

1. Open Tray 1.
2. Open the Duplex Unit Door.

1 2

s6400mfp-822

3. Turn the 2 locking knobs to unlock the Duplex Unit.

s6400mfp-823

WorkCentre 6400 Service Manual 8-175

Service Parts Disassembly

4. Press the tabs to release the Duplex Unit.

5. Open the Duplex Unit.

s6400mfp-824

6. Unhook the support wire from the printer.

7. Remove the Duplex Unit.

s6400mfp-825

8-176 WorkCentre 6400 Service Manual

Service Parts Disassembly

Duplex Unit Control Board (PL23.12)

1. Remove the Duplex Unit (page 8-175).

2. Remove the Duplex Unit Right Cover (page 8-173).
3. Disconnect the 4 wiring harness connectors P/J1_ADCB, P/J2_ADCB, P/
J3_ADCB, and P/J4_ADCB from the Duplex Unit Control Board.

P/J1_ADCB

P/J2_ADCB

P/J3_ADCB P/J4_ADCB s6400mfp-896

4. Remove 3 screws that secure the Duplex Unit Control Board.

5. Rotate the Actuator, lift the Duplex Unit Control Board and remove the
Duplex Unit Control Board.

s6400mfp-901

Replacement Note
Be sure to press the Actuator downward in order to position the
Duplex Unit Control Board in place.

WorkCentre 6400 Service Manual 8-177

Service Parts Disassembly

Duplex Unit Transport Motor (M8) (PL23.13)

1. Remove the Duplex Unit Control Board (page 8-177).

2. Disconnect the wiring harness connector P/J22.
3. Remove 2 screws that secure the Transport Motor.
4. Rotate and shift the Duplex Unit Transport Motor toward the left side and
remove the Duplex Unit Transport Motor.

P/J22
s6400mfp-897

Replacement Note
Be sure to shift the Duplex Unit Transport Motor to the right side when
installing the Motor.

8-178 WorkCentre 6400 Service Manual

Service Parts Disassembly

Finisher (Option)

Finisher Rear Cover (PL35.01)

Finisher Assembly (PL35.09)

1. Squeeze the tab on the Finisher Assembly Cable connector and

disconnect the cable from the printer.

s6400mfp-404

2. Pull the lever on the bottom of the Finisher Assembly, lift and remove the
Finisher Assembly.

s6400mfp-846

8-182 WorkCentre 6400 Service Manual

Service Parts Disassembly

Finisher Cover Assembly (PL36.01)

1. Remove the Finisher Assembly (page 8-182).

2. Remove the Finisher Sub Tray (page 8-191).
3. Remove the Finisher Main Tray (page 8-216).
4. Remove the Finisher Rear Cover (page 8-179).
5. Remove the Finisher Control Board (page 8-205).
6. Disconnect the wiring harness connector (behind the Finisher Control
Board).
7. Route the wiring harness connector through the hole.
8. Remove 2 screws that secure the Finisher Cover Assembly.
9. Remove the Finisher Cover Assembly.

s6400mfp-744

WorkCentre 6400 Service Manual 8-183

Service Parts Disassembly

10. Remove 1 screw that secures the Ground wire.

11. Disconnect the 2 wiring harness connectors P/J6 and P/J7.
12. Release the wiring harness clip and remove the wiring harness clip from
the Finisher frame.

P/J7
Wiring Harness Clip

P/J6

s6400mfp-745

8-184 WorkCentre 6400 Service Manual

Service Parts Disassembly

Paper Level Sensor (PS9/ PS10) (PL36.14)

1. Remove Finisher Cover Assembly (page 8-183) (steps 1-9).

2. Release the wiring harness clip from the Finisher frame.
3. Disconnect the wiring harness connector.
4. Release the Paper Level Sensor from the Cover Assembly.

PS10

PS9

s6400mfp-746

WorkCentre 6400 Service Manual 8-185

Service Parts Disassembly

Finisher Right Plate (PL37.01)

Finisher Top Tray (PL38.18)

1. Press the 2 tabs on the Top Tray inward to release it.

2. Remove the Top Tray.

s6400mfp-394

Replacement Note
Be sure to lift the flap on the Finisher up when installing the Top Tray.

s6400mfp-826

WorkCentre 6400 Service Manual 8-191

Service Parts Disassembly

Paper Exit Assembly (PL38.24)

1. Remove the Finisher Rear Cover (page 8-179).

2. Remove the Finisher Top Right Cover (page 8-188).
3. Remove the Finisher Right Plate (page 8-186).
4. Release the wiring harness retainers from the frame.
5. Shift the wiring harness connectors CN5 and P/J12 toward the arrow
direction as in the illustration.

Wiring Harness Retainers

CN5

P/J12

s6400mfp-827

6. Disconnect the Solenoid wiring harness connector.

CN6

s6400mfp-417

8-192 WorkCentre 6400 Service Manual

Service Parts Disassembly

7. Remove 4 screws (2 plastic with flange, 2 metal) that secure the Paper
Exit Assembly.
8. Open the Top Cover Assembly (PL38.03).
9. Slide the Top Cover Assembly upward and remove the Top Cover
Assembly.

Front Rear

s6400mfp-747

10. Disconnect the 3 wiring harness connectors (2 on the top side, 1 on the
bottom side).

s6400mfp-748

WorkCentre 6400 Service Manual 8-193

Service Parts Disassembly

11. Remove the Paper Exit Assembly.

12. Disconnect the wiring harness connector P/J5.
13. Cut the cable ties to release the 2 wiring harness clips from the Paper Exit
Assembly.
14. Route the wiring harness through the hole.

Wire Clips

P/J5

s6400mfp-750

15. Remove 1 screw that secures the Entrance Solenoid Assembly

(PL39.05).

s6400mfp-828

8-194 WorkCentre 6400 Service Manual

Service Parts Disassembly

Finisher Guide Assembly (PL38.25)

1. Remove the Finisher Top Right Cover (page 8-188).

2. Remove the Paper Exit Assembly (page 8-192) (steps 1-9).
3. Turn the Paper Exit Assembly over and lay it next to the Finisher.

Caution
Be careful when disconnecting the wiring harness connector to prevent
damaging the plastic holder.

4. Lift the Finisher Guide Assembly and turn it over.

5. Release the wiring harness holder from the Finisher Guide Assembly.
6. Disconnect the wiring harness connector and remove the Finisher Guide
Assembly.

s6400mfp-914

WorkCentre 6400 Service Manual 8-195

Service Parts Disassembly

Finisher Entrance Solenoid (SL1) (PL39.05)

1. Remove the Finisher Rear Cover (page 8-179).

2. Remove the Finisher Top Right Cover (page 8-188).
3. Remove the Finisher Right Plate (page 8-186).
4. Release the wiring harness retainers.
5. Shift the wiring harness connectors CN5 and P/J12 toward the arrow
direction as in the illustration.

Wiring Harness Retainers

CN5

P/J12

s6400mfp-827

6. Remove the right Finisher Right Plate (page 8-186).

7. Disconnect the Solenoid wiring harness connector.

CN6

s6400mfp-417

8. Remove the Paper Exit Assembly (page 8-192) (steps 1-9).

8-196 WorkCentre 6400 Service Manual

Service Parts Disassembly

9. Turn the Paper Exit Assembly over and lay it next to the Finisher.

Caution
Be sure to hold the Tension Spring (PL39.7) when removing the Solenoid
to prevent from losing the spring.

10. Remove 1 screw that secures the Entrance Solenoid Assembly.

11. Remove the Entrance Solenoid Assembly.

s6400mfp-828

Replacement Note
Be sure to feed the wiring harnesses through the hole on the printer
frame in order to connect the connectors. Pull the Guide (PL39.8)
toward you in order to align the Solenoid in place. Be sure to align the
mounting plate as in the illustration.

s6400mfp-751

WorkCentre 6400 Service Manual 8-197

Service Parts Disassembly

Finisher Roll Assembly (PL40.07)

1. Remove the Paper Exit Assembly (page 8-192) (steps 1-9).

2. Turn the Paper Exit Assembly over and lay it next to the Finisher.
3. Remove 3 screws that secure the Finisher Roll Assembly.
4. Lift and remove the Finisher Roll Assembly.

s6400mfp-752

8-198 WorkCentre 6400 Service Manual

Service Parts Disassembly

Storage Section Sensor (PS7) (PL41.02)

1. Remove the Finisher Right Plate (page 8-186).

2. Disconnect the wiring harness connector P/J3.
3. Release the Sensor tabs from the frame.
4. Remove the Storage Section Sensor.

P/J3
s6400mfp-884

WorkCentre 6400 Service Manual 8-199

Service Parts Disassembly

Roller Assembly (PL44.15)

1. Remove the Finisher Cover Assembly (page 8-183).

2. Remove the Paper Exit Assembly (page 8-192).
3. Remove the 3 C-Clips that secure the Roller.
4. Slide the Roller (PL44.11) toward the right side and remove the Pin
(PL44.5).
5. Slide the Roller Assembly toward the right side and remove the Roller
Assembly.

s6400mfp-753

8-200 WorkCentre 6400 Service Manual

Service Parts Disassembly

Stapler Assembly (PL45.11)

1. Remove the Finisher Front Cover (page 8-180).

2. Extend the Stapler Unit.

s6400mfp-389

3. Remove the Stapler Unit (PL45.09).

s6400mfp-397

WorkCentre 6400 Service Manual 8-201

Service Parts Disassembly

1. Remove the Finisher Rear Cover (page 8-179).

2. Disconnect the 23 wiring harness connectors on the Finisher Control
Board.

Note
Connectors CN25 and CN26 are not connected.

CN25 CN26 s6400mfp-406

3. Remove the 2 Stand-Off Posts from the Finisher Control Board.

4. Remove 2 screws that secure the Finisher Control Board.
■ Right screw: long plastic screw
■ Left screw: short metal screw
5. Remove the Finisher Control Board.

Posts s6400mfp-407

WorkCentre 6400 Service Manual 8-205

Service Parts Disassembly

Finisher Transport Motor (M3) (PL46.20)

1. Remove the Finisher Rear Cover (page 8-179).

2. Remove the Finisher Control Board (page 8-205).
3. Remove the wiring harness from the wiring harness retainers.
4. Disconnect the wiring harness connectors CN5 and P/J12.

Wiring Harness Retainers

CN5

P/J12

s6400mfp-413

8-206 WorkCentre 6400 Service Manual

Service Parts Disassembly

5. Unhook the 2 tabs and remove the wiring harness Guide.

6. Loosen the wiring harnesses from the top part of the wiring harness
Guide to gain access of the left screw on the Motor.

s6400mfp-909

WorkCentre 6400 Service Manual 8-207

Service Parts Disassembly

7. Unhook the Tension Spring (PL46.22).

8. Remove 2 screws that secure the Transport Motor Assembly.
9. Remove the Transport Motor Assembly.

Spring s6400mfp-415

10. Remove 2 screws that secure the Transport Motor to the Bracket
(PL46.23).
11. Remove the Transport Motor.

Note
Be sure to move the Bracket to the new Transport Motor.

s6400mfp-416

Replacement Note
When installing the Transport Motor Assembly, hook the Spring first,
then secure Transport Motor Assembly with one screw. This will
stretch the Spring.

When installing the Transport Motor, be sure to align the Belt with the
motor’s gear.

8-208 WorkCentre 6400 Service Manual

Service Parts Disassembly

Finisher Exit Motor (M4) (PL46.20)

1. Remove the Finisher Rear Cover (page 8-179).

2. Remove the Finisher Control Board (page 8-205).
3. Remove the wiring harness from the wiring harness retainers.

Wiring Harness Retainers

s6400mfp-829

WorkCentre 6400 Service Manual 8-209

Service Parts Disassembly

4. Unhook the 2 hooks and remove the wiring harness Guide with the wiring
harnesses.

s6400mfp-909

8-210 WorkCentre 6400 Service Manual

Service Parts Disassembly

5. Disconnect the wiring harness connector.

6. Unhook the Tension Spring (PL46.22).
7. Remove 2 screws that secure the Exit Motor Assembly.
8. Remove the Exit Motor Assembly.

s6400mfp-418

9. Remove 2 screws that secure the Exit Motor to the Bracket (PL46.21).

Note
Be sure to hold the Belt while removing the Exit Motor.

10. Remove the Exit Motor.

P/J13
s6400mfp-419

Replacement Note
When installing the Exit Motor Assembly, hook the Spring first, then
secure the Transport Motor Assembly with a screw. This will stretch
the Spring. When installing the Exit Motor, be sure to position the belt
in place.

WorkCentre 6400 Service Manual 8-211

Service Parts Disassembly

Finisher Motor Fan (FM1) (PL46.24)

1. Remove the Finisher Rear Cover (page 8-179).

2. Disconnect the wiring harness connector.
3. Cut the tie wrap.
4. Remove the 2 wiring harness retainers.
5. Remove 2 screws that secure the Motor Fan.
6. Remove the Finisher Motor Fan.

s6400mfp-412

8-212 WorkCentre 6400 Service Manual

Service Parts Disassembly

Finisher Exit Roller Up/ Down Motor (M5) (PL47.05)

1. Remove the Finisher Control Board (page 8-205).

2. Release the wiring harness holder from the Finisher frame.
3. Remove 5 screws (1 plastic screw, 4 metal screws) that secure the
Mounting Metal Plate Assembly.

s6400mfp-918

s6400mfp-420

WorkCentre 6400 Service Manual 8-213

Service Parts Disassembly

4. Disconnect the wiring harness connector.

5. Loosen 1 screw that secures the Bracket (PL47.07).
6. Remove 2 screws that secure the Ground Wire.
7. Remove the Ground Wire.
8. Remove 4 screws that secure the Exit Roller Up/ Down Motor Assembly.

Note
The screw on the top side is a short screw.

9. Remove the Exit Roller Up/ Down Motor Assembly.

Loosen only, do not remove

s6400mfp-421

10. Remove 2 screws that secure the Exit Roller Up/ Down Motor and the
Bracket (PL47.07).
11. Remove the Exit Roller Up/ Down Motor.

s6400mfp-907

8-214 WorkCentre 6400 Service Manual

Service Parts Disassembly

Replacement Note
When installing the Exit Roller Up/Down Motor Assembly, be sure to
position the Bracket front of the Motor Assembly.

Be sure to position the belts on the gears and motors in the correct
positions.

s6400mfp-915

s6400mfp-902

WorkCentre 6400 Service Manual 8-215

Service Parts Disassembly

Finisher Main Tray (PL48.18)

1. Remove the 2 clips that secure the Main Tray.

s6400mfp-395

2. Slide the Main Tray out and remove the Main Tray.

s6400mfp-396

8-216 WorkCentre 6400 Service Manual

Service Parts Disassembly

Printer Stand (Option)

Stand Assembly (PL49.01)

1. Remove the 500-Sheet Feeder (page 8-166).

2. Remove 4 screws that secure the left and right Brackets.
3. Remove the left and right Brackets.

s6400mfp-830

WorkCentre 6400 Service Manual 8-217

Service Parts Disassembly

4. Slide the Optional 500-Sheet Feeder back to release the latch on the
bottom of the Optional 500-Sheet Feeder from the Printer Stand.
5. Lift and remove the Optional 500-Sheet Feeder.

s6400mfp-831

8-218 WorkCentre 6400 Service Manual

Parts List
In this chapter...
■ Serial Number Format
■ Using the Parts List
■ Overview Parts
■ Print Engine Parts
■ Option - 500-Sheet Feeder
■ Option - Finisher
■ Option - Printer Stand
■ Xerox Supplies and Accessories

Chapter
9
Parts List

Serial Number Format

Changes to Xerox products are made to accommodate improved components

as they become available. It is important when ordering parts to include the
following information:
■ Component's part number
■ Product type or model number
■ Serial Number of the printer

The nine-digit serial number has the following format:

■ PPPRSSSSS
■ PPP = Three digit alphanumeric product code

■ R = Single digit numeric revision digit, 0~9. To be rolled when a major product
change occurs and initiated with a change request.

Product Product Code

WorkCentre 6400 (110V) KAA
WorkCentre 6400V (220V) HYX

SSSSS = Five digit numeric serial number based on the following table:

Starting Serial Ending Serial

Product Total
Number Number
WorkCentre 6400 00501 99999 69998
WorkCentre 6400V 00501 99999 69998

9-2 WorkCentre 6400 Service Manual

Parts List

Example

KAA030001: Xerox Serial Number

KAA: Product Code for the WorkCentre 6400
1 = Revision Level
30001 = Serial Number for 6400
The serial number labels can be found at two locations of the printer.

Label Placement

The Barcode label is applied to the Rear panel on the left side of the printer.
Barcode Label Location

MANUFACTURED: May 2009

S/N: KAA030001

s6400mfp-851

WorkCentre 6400 Service Manual 9-3

Parts List

The Text-only label is applied to the front of the printer chassis.

Text-Only Label Location

Factory ID: KAA030001

s6400mfp-852

Label Layout Examples

MANUFACTURED: May 2009

S/N: KAA030001

Factory ID: KAA030001

s6400mfp-853

9-4 WorkCentre 6400 Service Manual

Parts List

Using the Parts List

■ ID No.: The callout number from the exploded part diagram.

■ Name/Description: The name of the part to be ordered and the number

of parts supplied per order.

■ Part Number: The material part number used to order that specific part.
■ Qty: The quantity indicates quantity per engine, not part number.

■ Parts identified throughout this manual are referenced PL#.#; For

example, PL3.10 means the part is item 10 of Parts List 3.1.

■ A black triangle preceding a number followed by a parenthetical statement

in an illustrated parts list means the item is a parent assembly, made up of
the individual parts called out in parentheses.

■ The notation “with X~Y” following a part name indicates an assembly that
is made up of components X through Y. For example, “1 (with 2~4)”
means part 1 consists of part 2, part 3, and part 4.

■ An asterisk (*) following a part name indicates the page contains a note
about this part.

■ The notation “J1<>J2 and P2” is attached to a wire harness. It indicates

that connector Jack 1 is attached to one end of the wire harness and
connector J2 is attached to the other end that is plugged into P2.

Note
Only parts showing part numbers are available for ordering by support.
Parts not showing part numbers are available on the parent assembly.

Abbreviations

Abbreviation Meaning

C C-ring
E E-ring
KL K-clip
S Screw

WorkCentre 6400 Service Manual 9-5

Parts List

Overview Parts

Parts List - Overview

1
13

2
15
9 14

3 18

6 17 s6400mfp-317

Item Description

1. Horizontal Transport Unit

2. Fusing Unit
3. Duplex Unit
4. Vertical Transport Unit
5. Tray 1 (Manual Feed)
6. Tray 2
7. Laser Unit Section
8. Waste Toner Transport Section
9. Main Frame Section
10. External Parts
11. LVPS Section
12. Paper Exit Section
13. Scanner (IR Section)
14. DADF Section

9-6 WorkCentre 6400 Service Manual

Parts List

Table of Contents

Name/Description Parts List Page

Duplex Automatic Document Feeder Assembly PL 1.0 page 9-9
Scanner Assembly (IR Section) PL 2.0 page 9-11
Covers PL 3.0 page 9-13
Main Frame PL 4.0 page 9-15
Tray 1 (Manual Feed) PL 5.0 page 9-17
Imaging Unit Rail PL 6.0 page 9-19
Imaging Unit Contact PL 7.0 page 9-21
Waste Toner Transport PL 8.0, PL 9.0 page 9-23
LVPS/ Laser Unit PL 10.0 page 9-27
Drive Section (1 of 3) - 2nd Transfer Pressure/ Retraction PL 11.0 page 9-29
Drive Section (2 of 3) - Main Drive PL 12.0 page 9-31
Drive (3 of 3) - Toner Supply (Hopper) PL 13.0 page 9-33
Transfer Belt Unit PL 14.0 page 9-35
Vertical Transport Unit (1 of 2) PL 15.0 page 9-37
Vertical Transport Unit (1 of 2) PL 16.0 page 9-39
Horizontal Transport Unit PL 17.0 page 9-41
Fuser Unit PL 18.0 page 9-44
Paper Exit PL 19.0 page 9-45
Electrical Components PL 20.0 page 9-47
500-Sheet Tray PL21.0 page 9-50
Duplex Unit (1 of 2) PL 22.0 page 9-52
Duplex Unit (2 of 2) PL 23.0 page 9-54
Wiring (1 of 2) PL 24.0 page 9-56
Wiring (2 of 2) PL 25.0 page 9-58
Wiring Accessories PL 26.0 page 9-59
Accessories PL 27.0 page 9-60
Optional 500-Sheet Tray 3/ Tray 4 (1 of 7) PL 28.0 page 9-61
Optional 500-Sheet Tray 3/ Tray 4 (2 of 7) - PL 29.0 page 9-63
Paper Take-Up Section (500-Sheet Feeder)
Optional 500-Sheet Tray 3/ Tray 4 (3 of 7) - PL 30.0 page 9-65
Drive Section (500-Sheet Feeder)
Optional 500-Sheet Tray 3/ Tray 4 (4 of 7) - PL 31.0 page 9-67
Paper Feed Tray Section (500-Sheet Feeder)
Optional 500-Sheet Tray 3/ Tray 4 (5 of 7) - PL 32.0 page 9-69
Paper Feed Tray Section (500-Sheet Feeder)
Optional 500-Sheet Tray 3/ Tray 4 (6 of 7) - PL 33.0 page 9-71
Wiring Accessories
Optional 500-Sheet Tray 3/ Tray 4 (7 of 7) - PL 34.0 page 9-72
Accessory Parts (500-Sheet Feeder)
Option - Finisher, Cover (1 of 2) PL 35.0 page 9-73
Option - Finisher, Cover (2 of 2) PL 36.0 page 9-74
Frame (Finisher) PL 37.0 page 9-76
Paper Entrance (Finisher) PL 38.0 page 9-78

WorkCentre 6400 Service Manual 9-7

Parts List

Table of Contents

Name/Description Parts List Page

Paper Transport (1 of 2) (Finisher) PL 39.0 page 9-80
Paper Transport (1 of 2) (Finisher) PL 40.0 page 9-82
Alignment (1 of 2) (Finisher) PL 41.0 page 9-83
Alignment (2 of 2) (Finisher) PL 42.0 page 9-84
Storage (1 of 2) (Finisher) PL 43.0 page 9-85
Storage (2 of 2) (Finisher) PL 44.0 page 9-86
Stapler Unit (Finisher) PL 45.0 page 9-88
Drive (1 of 2) (Finisher) PL 46.0 page 9-90
Drive (2 of 2) (Finisher) PL 47.0 page 9-92
Main Tray (Finisher) PL 48.0 page 9-94
Option - Printer Stand PL 49.0 page 9-96

9-8 WorkCentre 6400 Service Manual

Parts List

Print Engine Parts

Parts List 1.0 Duplex Automatic Document Feeder Assembly

1 7 8
2

3 4

6
5

s6400mfp-422

WorkCentre 6400 Service Manual 9-9

Parts List

Parts List 1.0 Duplex Automatic Document Feeder Assembly

Parts List 7.0 Imaging Unit Contact

3
24
4
23 21 5
22
a
19 6
b
20
19 7
8
10
FM13 11
18 a

16 SW5
13 a
14 9
17
15 12

s6400mfp-322

WorkCentre 6400 Service Manual 9-21

Parts List

Parts List 7.0 Imaging Unit Contact

ID No. Name/Description Part Number Qty. Comments

1. Seal 1
2. Seal 1
3. Holder 4
4. Pressure Spring 4
5. Holder 4
6. Pressure Spring 4
7. Holder 019E81220 1
8. Seal 1
9. Duct 1
10. Wire Harness Assy (C4HV2, G4HV2) 1 Y Imaging Unit to HVPS-2
11. Switch (SW5) 110E19930 1 Tray 2 Paper Size Switch
12. Actuator 120E36330 1 Tray 2 Paper Size Actuator
13. Wire Harness Assy (C3HV2, G3HV2) 1 M Imaging Unit to HVPS-2
14. Wire Harness Assy (C2HV2, G2HV2) 1 C Imaging Unit to HVPS-2
15. Wire Harness Assy (C1HV2, G1HV2) 1 K Imaging Unit to HVPS-2
16. Duct 1
17. Ozone Filter 108R00815 1 Includes with Transfer Roller
18. Seal 1
19. Screw 2
20. Fan Motor (FM13) 127E16410 1 Exhaust Fan Motor
(Ozone Ventilation Fan)
21. Cover 4
22. Contact (*) 4
23. Contact (*) 4
24. Contact (*) 4
25. Holder 4
a. Screw 6 P/O Hardware Kit
b. Screw 1 P/O Hardware Kit
(*) Developer Bias Voltage contact from HVPS-1.

9-22 WorkCentre 6400 Service Manual

Parts List

Parts List 8.0 Waste Toner Transport (1 of 2)

2
1 5
3 8
6
4 7
a b
20

9 10
19 11
18
13
16
15 14 c

17 d 12
23 a

19
3
2
1
4 6 c
5 a 8

a
b 7

10
9
a 18
d
11
a a 10
18
10

13
17 12
LVPS (DCPU)

14
16

SW1
15 s6400mfp-325

WorkCentre 6400 Service Manual 9-27

Parts List

Parts List 10.0 LVPS/ Laser Unit

ID No. Name/Description Part Number Qty. Comments

1. Seal 1
2. Reinforce Plate 1 LVPS Shield
3. Seal 1
4. Seal 1
5. Seal 1
6. Bracket 1
7. Wire Harness Assy (*) 962K76270 1 “Map 1 - LVPS (DCPU)” on page 10-18
8. Duct 1
9. Seal 1
10. Shoulder Screw 826E49140 3 Laser Unit Mounting Screw
11. Laser Unit 017E16960 1 Print Head Assy (P/H)
12. Seal 1
13. Seal 1
14. Seal 1
15. Switch 110E20890 1 Power Switch
16. Cover 1
17. LVPS - 120V 105E24160 1 DCPU
LVPS - 220V 105E24170 1 DCPU
18. Bracket 2
19. Seal 1
a. Screw (Tapping) 5 P/O Hardware Kit
b. Screw 1
c. Screw 1 P/O Hardware Kit
d. Screw (Tapping) 2 P/O Hardware Kit
(*) Connections to Fuser, LVPS, I/P Board, MCU Board, Scanner. PL 10.7 includes Fuser Bulkhead connector.

9-28 WorkCentre 6400 Service Manual

Parts List

Parts List 11.0 Drive (1 of 3) - 2nd Transfer Pressure/ Retraction

Parts List 14.0 Transfer Belt Unit

23
b
1
22 2 13 14
9
3 8
12 b
7
IDCSB/R IDCSB/F
b b
10 15
4
21 5 11 10 13
a 6 10 12
a 24
10 9
PS12 25
5
18
19 20 6
26
a

27
17

16 28

s6400mfp-329

WorkCentre 6400 Service Manual 9-35

Parts List

Parts List 14.0 Transfer Belt Unit

ID No. Name/Description Part Number Qty. Comments

1. Rail 1
2. Plate Nut 1
3. Lever 1
4. Contact 1
5. Pressure Spring 2
6. Stop Plate 2
7. Torsion Spring 1
8. Guide Plate 1
9. Screw 2
10. Screw 4
11. Cover 848E40550 1 IDCSB Shutter
12. Earth Ground 2
13. Image Density Control Board (IDCSB) 960K51960 2 R = Rear
F = Front
14. Guide 1
15. Torsion Spring 809E94740 1 IDCSB Shutter Spring
16. Transfer Belt Unit 108R00816 1
17. Wire Harness Assy (T1HV2) 1 HV2 to 1st Image Transfer
18. Contact 1
19. Guide Plate 1
20. Photo Interrupter (PS12) 130E11800 1 Pressure/ Retraction Sensor 1
21. Rail 1
22. Wire Harness Assy (CN27-PJ13) 1 MCU to PS12
23. Wire Harness Assy (T2HV2) 1 HV2 to 2nd Image Transfer
24. Guide Plate 1
25. Torsion Spring 1
26. Contact 1
27. Rail 1
28. Plate Spring 1
a. Screw 3 P/O Hardware Kit
b. Screw 2 P/O Hardware Kit

9-36 WorkCentre 6400 Service Manual

Parts List

Parts List 15.0 Vertical Transport Unit (1 of 2)

1 A P.16.0

2
25
3 a

a
24
24

8 22
a 21 b
23 a 12

20 a
a 4
13 11
19
PS10

14 7 a a
15 6 5
18 17 c a
16
10 9
9
c a 8
10 s6400mfp-330

WorkCentre 6400 Service Manual 9-37

Parts List

Parts List 15.0 Vertical Transport Unit (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Vertical Transport Assy 059K69690 1 Complete Right Door Assembly
2. Cover 1
3. Pawl 1
4. Torsion Spring 1
5. Claw 1
6. Cover 1
7. Ground Plate 1
8. Shaft 2
9. Torsion Spring 2
10. Stopper 2
11. Ground Plate 1
12. Bracket 1
13. Actuator 120E36360 1 Paper Loop Sensor Actuator
14. Photo Interrupter (PS10) 130E11800 1 Paper Loop Sensor
15. Guide 1
16. Plate Spring 1
17. Ground Plate 1
18. Guide 1
19. Guide 1
20. Torsion Spring 1
21. Wire Harness Assy (CN14A/B-PJ11) 962K76760 1 MCU to Duplex Unit
22. Plate Spring 1
23. Plate Spring 1
24. Pressure Spring 809E94750 2
25. Label - Fuser Jam 896E86840 1
a. Screw (Tapping) 10 P/O Hardware Kit
b. Screw 2 P/O Hardware Kit
c. Screw (Tapping) 1 P/O Hardware Kit

9-38 WorkCentre 6400 Service Manual

Parts List

Parts List 16.0 Vertical Transport Unit (2 of 2)

A PL.15.0

1
2 3

2
20 4

5
19 1
12 6
a
e
7 5
CL2
d
18 17 8
c
15 10
9
a
9 22
10

15 21 11
b
14 13 12 e
s6400mfp-331

WorkCentre 6400 Service Manual 9-39

Parts List

Parts List 16.0 Vertical Transport Unit (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Holder 2
2. Pressure Spring 2
3. Stopper 1
4. Set Plate 1
5. Pressure Spring 809E94760 2
6. Roller 1
7. Roller 1
8. Solid State Switch 1 OHP Sensor Reflector
9. Tension Spring 2
10. Bushing 2
11. Lever 1
12. Roll 2
13. Gear 20T 1
14. Gear 15T 1
15. Bushing 2
16. Earth Ground 1
17. Spacer 1
18. Clutch (CL2) 121E26560 1 Registration Clutch
19. Lever 1
20. Transfer Roller 108R00815 1 Includes Ozone Filter
21. Washer 1
22. Registration Roller Assy 059K69700 1 Complete Assembly
a. Pin 2
b. Screw (Tapping) 1 P/O Hardware Kit
c. E-Ring 2 P/O Hardware Kit
d. E-Ring 1
e. C-Clip 019E81510 2 P/O Hardware Kit

9-40 WorkCentre 6400 Service Manual

Parts List

Parts List 17.0 Horizontal Transport Unit

37 38 1 b
38 45 2 3
39 40
b
a 40 44
a b b
a 4142
50
11 50 a
48 b
b a 3
a 11

27 35 46 43 49
a b
28 36 47 10 a
9
29 34 8 4
33 7
6 a
11
30 31 a b a b 12 5
32 13 8 5
a
24 14 15 16 11
50
24 22 17 12
b 7
23 6
c 21 20 6
19 18
16
b b 11
26 2525
26 25
25

d
26 26 s6400mfp-424

WorkCentre 6400 Service Manual 9-41

Parts List

Parts List 17.0 Horizontal Transport Unit

ID No. Name/Description Part Number Qty. Comments

1. Duct 1
2. Reinforce Plate 1
3. Spring 2
4. Guide 1
5. Guide 2
6. Bushing 3
7. Torsion Spring 2
8. Collar 2
9. Bracket 1
10. Ground 1
11. Bushing 5
12. Pulley 14T 2
13. Shaft 1
14. Pulley 14T 1
15. Gear 14/17T 1
16. Roller 2
17. Shaft 1
18. Bracket 1
19. Timing Belt 308L 1
20. Timing Belt 206L 1
21. Timing Belt 280L 1
22. Bracket 1
23. Duct 1
24. Cushion 2
25. Spring 4
26. Roll 4
27. Guide 1
28. Seal 1
29. Holder 1
30. Pressure Spring 1
31. Tension Spring 1
32. Gear 30T 1
33. Gear 16T 1
34. Arm 1
35. Gear 17T 1
36. Gear 16T 1
37. Horizontal Transport - Upper 059E10840 1 Complete Assembly
38. Gear 22T 2
39. Shaft 1
40. Gear 17T 2

9-42 WorkCentre 6400 Service Manual

Parts List

Parts List 17.0 Horizontal Transport Unit (continued)

ID No. Name/Description Part Number Qty. Comments

41. Gear 17T 1
42. Holder 1
43. Shaft 1
44. Pulley 14T 1
45. Shaft 1
46. Screw 1
47. Neutralizing Brush 1
48. Horizontal Transport - Lower 059E10830 1 Complete Assembly
49. Seal 1
50. Bearing 6
a. E-Ring 10 P/O Hardware Kit
b. Screw 8 P/O Hardware Kit
c. Screw 2

WorkCentre 6400 Service Manual 9-43

Parts List

Parts List 18.0 Fuser Unit

5 PS2

PS1

a 3

b
s6400mfp-332

Parts List 18.0 Fuser Unit

ID No. Name/Description Part Number Qty. Comments

1. Fuser Unit - 120V 115R00059 1
Fuser Unit - 220V 115R00060 1
2. Seal 1
3. Shoulder Screw 2
4. Pawl 807E34410 2
5. Photo Interrupter (PS1, PS2) 130E11800 2 PS1 = Fuser Exit Sensor
PS2 = Paper Feed Sensor
a. C-Clip 019E81510 2 P/O Hardware Kit
b. Screw (Tapping) 2 P/O Hardware Kit

9-44 WorkCentre 6400 Service Manual

Parts List

Parts List 19.0 Paper Exit

1
2
3 4 5
a 7

6
24 b
a a
a
21
23
22
27
13 c 8

d PS15 a

c
20 d 9
19 10
11
d
PS14
12
a
18 13
16 14
25 17
17 15
16 28
17
17

s6400mfp-508

WorkCentre 6400 Service Manual 9-45

Parts List

Parts List 19.0 Paper Exit

ID No. Name/Description Part Number Qty. Comments

1. Shaft 1
2. Gear 17T 1
3. Torsion Spring 1
4. Gear 22T 1
5. Gear 16T 1
6. Bushing 1
7. Actuator 120E36490 1 Output Tray Full Actuator
8. Roller 1
9. Actuator 1 Exit Sensor Actuator
10. Guide 1
11. Torsion Spring 1
12. Bracket 1
13. Photo Interrupter (PS14, PS15) 130E11800 2 PS14 = Paper Tray Full Sensor
PS15 = Exit Sensor 2
14. Lever 1
15. Bushing 1
16. Plate Spring 2
17. Roll 4
18. Shaft 1
19. Bracket 1
20. Bracket 1
21. Bracket 1
22. Pressure Spring 1
23. Gear 17T 1
24. Shaft 1
25. Paper Exit Assy 848K25690 1 Complete Assembly
26. -----
27. Sensor Wiring 2 Wiring Harness (*) 1 MCU Board to PS14, PS15
28. Pressure Spring 1
a. E-Ring 6 P/O Hardware Kit
b. Pin 1 P/O Hardware Kit
c. Screw (Tapping) 2 P/O Hardware Kit
d. Screw 2 P/O Hardware Kit
(*) Connections from CN-Exit, CN-Exit1, CN-Exit2 (PS14/PS15) to MCU Board.

9-46 WorkCentre 6400 Service Manual

Parts List

Parts List 20.0 Electrical Components

2 aa aa

1 44
37 3 44

35 45
b c FM14 10
4 46
5 b
43 46
6 8 7
b 42
b b f 14
9 11
b b
34 36
36 13
36 FM15
12
15 17
36 b
b b
b 15 15
33 a 16
40 a
b
b a
40 15 HV1
39 26
b 18
38 b 25
24
b d
38 b 27
b 32 22 HV2 19
b b
a
31 b 20
23
b 28 21
30 e
29 s6400mfp-333

WorkCentre 6400 Service Manual 9-47

Parts List

Parts List 20.0 Electrical Components

ID No. Name/Description Part Number Qty. Comments

1. Shoulder Screw 1 Included with Hardware Kit
2. Rear Cover Access Door 848E40120 1
3. HDD - CC 121K50770 1 Copy Controller
HDD - NC 121K50810 1 Network Controller
4. Shield 1 RF Protective Shield
5. Horizontal Transport Fan (FM14) 127E16560 1
6. Bracket 1
7. Image Processor Board 960K51980 1 I/P Board (includes Fax and SATA
Daughter Board)
8. Ribbon Cable 962K76280 1 I/P Board to MCU Board Ribbon Cable
9. Engine Controller Board (MFPB) 960K51970 1 MCU Board
10. Duct 1
11. Cooling Fan (FM15) 127E16550 1 I/P Board Cooling Fan Motor
12. Supporter 1
13. Bracket 1
14. Bracket 1
15. Seal 4
16. HVPS-1 (HV1) 105K35700 1 HV Power Supply 1
17. Ribbon Cable (CN1HV1-PJ17MCU) 962K76290 1 MCU to HV1 Ribbon Cable
18. Ribbon Cable (CN1HV2-PJ17MCU) 962K76300 1 MCU to HV2 Ribbon Cable
19. Bracket 1
20. Wire Harness Assy (CN25-PJ20MCU) 962K76310 1 Engine to LTA Harness
21. HVPS-2 (HV2) 105K35710 1 HV Power Supply 2
22. Cover 1
23. Bracket 1
24. Shield 1
25. Hold Plate 1
26. Bracket 1
27. Bracket 1 Card Cage
28. Bracket 1
29. Wire Harness Assy (CN1PG1) 1 AC Input
30. Wire Harness Assy (CN29L/A-PJ34/35MCU) 962K76770 1 Engine to Finisher Harness
31. Bracket 1
32. Ferrite Core 1
33. I/P Board Back Panel 848E40130 1
34. Hinge 1
35. Hinge 1
36. Seal 4
37. Washer 1
38. Screw 2

9-48 WorkCentre 6400 Service Manual

Parts List

Parts List 20.0 Electrical Components (continued)

ID No. Name/Description Part Number Qty. Comments

39. Screw 1
40. Hex Nut 2
41. -----
42. Fax Board 960K51990 1
43. NVM Module 960K58220 1
44. RAM (Memory DIMM) 237E24920 2 512 MB each
45. IP Board NVRAM Chip 960K52040 1
46. Hard Drive Cable 962K40460 1 Common harness for both NC and CC
HDDs
a. Screw 8 P/O Hardware Kit
b. Screw (Tapping) 14 P/O Hardware Kit
c. Screw 1
d. Screw (Tapping) 1 P/O Hardware Kit
e. Screw 1
f. Screw 1

WorkCentre 6400 Service Manual 9-49

Parts List

1 CN1PG1 SW1 CN1_INPDCPU

PJ9

PJ12MCU PJ8
PJ25 PJ24 5
PJ23 PJ33MCU
PJ29MCU PJ14MCU
2
PJ22 PJ8MCU PJ31
6 PJ32
PJ5MCU CN26 CN27
3 PJ33 PJ27MCU
PJ7MCU PJ14
PJ6MCU PJ16
CN11 CN12 CN13 PJ15

PJ6 PJ20 PJ21

PJ15MCU PJ26MCU PJ18
4 PJ7 7

PJ25MCU PJ19
s6400mfp-335

9-56 WorkCentre 6400 Service Manual

Parts List

Parts List 24.0 Wiring (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Wire Harness Assy 1
■ CN1PG1-SW1-CN1INPDCPU

2. Wire Harness Assy 962K76780 1 CMYK Toner CRUM Harness

■ PJ29MCU to PJ22(Y), PJ23(M), PJ24(C) &
PJ25(K)
3. Wire Harness Assy 1
■ PJ5MCU to PJ33(SW5)

■ PJ6MCU to CN11(CL3), CN12(CL1) &

CN13(FM13)
4. Wire Harness Assy 962K76790 1
■ PJ15MCU to PJ7(PS9) and PJ20(PS5)

■ PJ25MCU to PJ6(Temp/Hum Sensor)

5. Wire Harness Assy 1

■ PJ12MCU to PJ8(IDCSB/R) & PJ9(IDCB/F)

6. Wire Harness Assy 962K76820 1 Developer Motors Harness

■ PJ7MCU to PJ31(M6), PJ32(M7),
CN26(CL4), CN27/PJ13(PS12)
■ PJ8MCU & PJ33MCU to PJ21(M5) &
PJ16(M4)
■ PJ14MCU to PJ14(M3)

■ PJ27MCU to PJ15(M1)

7. Wire Harness Assy 1

■ PJ26MCU to PJ19(PS7) & PJ18(PS6)

WorkCentre 6400 Service Manual 9-57

Parts List

Parts List 25.0 Wiring (2 of 2)

CN_EXIT1
PJ36MCU
1 CN_EXIT2

PJ10MCU PJ3MCU
2 PJ10
MS2 MS3 MS4

CN17 PJ11

PJ3

CN_FAN1 PJ13MCU PJ1TLSB

3 PJ37MCU 4
PJ2TLSB

CN_OPN CN_SCN2
5 PJ1MCU PJ101
CN1_SCN1
PJ101 PJ7IPB
CN_MBC
PJ102 PJ1MCU
PJ7IPB s6400mfp-336

Parts List 25.0 Wiring (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Wire Harness Assy 1 Paper Full and Exit Sensor Harness
2. Wire Harness Assy (Interlock) (*) 962K76800 1 Front and Right Door Sensor Harness
3. Wire Harness Assy (Relay) 1
4. Wire Harness Assy 962K76810 1 TLSB Harness
5. Wire Harness Assy (Power Source) 962K76270 1 Fuser Bulkhead Connector
(*)
■ Connections from PJ10MCU to CN17, CL5, PJ10(PS3), PJ11(PS13) & PJ3 (PS4)
■ Connections from PJ3MCU to MS2 & MS3 & MS4

9-58 WorkCentre 6400 Service Manual

Parts List

Parts List 26.0 Wiring Accessories

1 4 7

9.2 7.3 L=104

11.5 4.8
2 5 8

5.6

8.5
21.5
11.2
11.5
3 6 9

7.4
31.4

32.4
18 18
s6400mfp-835

Parts List 26.0 Wiring Accessories

ID No. Name/Description Part Number Qty. Comments

1. Saddle
2. Saddle
3. Saddle
4. Saddle 2 P/O Hardware Kit
5. Clamp
6. Clamp
7. Band 2 P/O Hardware Kit
8. Saddle
9. Holder P/O Hardware Kit

WorkCentre 6400 Service Manual 9-59

Parts List

Parts List 27.0 Accessories

1 2

4
3

s6400mfp-338

Parts List 27.0 Accessories

ID No. Name/Description Part Number Qty. Comments

1. Tray 1
2. Tray 1
3. Power Cord, 120V 117E35990 1 Refer to “Xerox Supplies and
Accessories” on page 9-98 for non-
North America Power Cord part
numbers.
4. Output Tray 050E28910 1

9-60 WorkCentre 6400 Service Manual

Parts List

Option - 500-Sheet Feeder

Parts List 28.0 Optional 500-Sheet Tray 3/4 (1 of 7)

20 25 (with 1 ~ 24, 26)

20
22
b 26
19 b 18 21 2 3
a a
b
b 1
18 4
a b
23 2
b 5
16

a 4
17 5
a
PCCB

15 9
b
MS1 6
11 10
a

14 12
10 7
13
a a
9 24
24
9 8
s6400mfp-428

WorkCentre 6400 Service Manual 9-61

Parts List

Parts List 28.0 Optional 500-Sheet Tray 3/4 (1 of 7)

ID No. Name/Description Part Number Qty. Comments

1. Cover 1
2. Sound Shield 2
3. Door 1
4. Lever 2
5. Torsion Spring 2
6. Rail 1
7. Frame 1
8. Bracket 1
9. Rubber Foot 017E11810 3
10. Bracket 2
11. PWB Assy (PCCB) 960K52010 1 LTA Circuit Board
12. Actuator 120E36370 1 LTA Paper Size Switch Actuator
13. Wire Harness Assy 962K76320 1
14. Switch (MSI) 110E19930 1 Paper Size Switch
15. Bracket 1
16. Plate Spring 1
17. Cover 1
18. Plate Spring 2
19. Bracket 1
20. Shoulder Screw 2
21. Bracket 1
22. Wire Harness Assy (PJ20MCU-CN25) 962K76330 1 LTA to Engine
23. Wire Harness Assy (PJ1PCCB-CN25) 962K77190 1 Tray 3 to Tray 4 Connector
24. Reinforce Plate 2
25. Optional-500 Sheet Feeder 050K68330 1 Complete 500-Sheet Feeder Assembly
(does not include Tray)
26. Label 1
a. Screw 8 P/O Hardware Kit
b. Screw 7 P/O Hardware Kit

9-62 WorkCentre 6400 Service Manual

Parts List

Parts List 29.0 Optional 500-Sheet Tray 3/4 (2 of 7) - Paper Take-up Section

a 1
22
22
16 3
c 23 25 e 18 3
7 2
19 a
6 d
15 22
1
a 17
a
PS23
21
PS24 11
d 8 20 4
5

b PS22

11
26 24
14 6
b 7

c
11
13
12 10
9 a
8
d

s6400mfp-429

WorkCentre 6400 Service Manual 9-63

Parts List

Parts List 29.0 Optional 500-Sheet Tray 3/4 (2 of 7) - Paper Take-Up Section

ID No. Name/Description Part Number Qty. Comments

1. Roller 2
2. Shaft 1
3. Roller 2
4. Roller 1
5. Sheet 1
6. Tension Spring 2
7. Bushing 2
8. Bushing 2
9. Frame 1
10. Guide Plate 1
11. Photo Interrupter (PS22, PS23, PS24) 130E13020 3 PS22 = Media Empty Sensor
PS23 = Media Feed Sensor
PS24 = Right Door Sensor
12. Guide 1
13. Torsion Spring 1
14. Frame Assy 1
15. Gear 22T 1
16. Gear 22T 1
17. Bracket 1
18. Torsion Spring 1
19. Actuator 120E36400 1 Tray 3/4 Paper Feed Sensor Actuator
20. Actuator 1
21. Guide 1
22. Pin 3
23. Pin 1
24. Slider 1
25. Wire Harness Assy (*) 1
26. Label 1
a. C-Clip 5
b. Screw 2 P/O Hardware Kit
c. C-Clip 2
d. Screw 3 P/O Hardware Kit
e. C-Clip 1 P/O Hardware Kit
(*) Connections from PJ5PCCB to PJ28(PS24), PJ29(PS23) & PJ30(PS22)

9-64 WorkCentre 6400 Service Manual

Parts List

Parts List 30.0 Optional 500-Sheet Tray 3/4 (3 of 7) - Drive Section

a 1
2

4
b c
5
CL6

a 7 9
8 d
10
11
15

e
14
c

f M16

s6400mfp-430

WorkCentre 6400 Service Manual 9-65

Parts List

Parts List 30.0 Optional 500-Sheet Tray 3/4 (3 of 7) - Drive Section

ID No. Name/Description Part Number Qty. Comments

1. Bushing 1
2. Bracket 1
3. Clutch (CL6) 121E26590 1 Paper Feed Clutch
4. Gear 24T 1
5. Shaft 1
6. Holder 1
7. Pressure Spring 1
8. Pawl 1
9. Gear 32T 1
10. Torsion Spring 1
11. Gear 1
12. Motor (M16) 127E16480 1 Transport Motor
13. Bracket 1
14. Gear 18/40T 1
15. Gear 24T 1
a. C-Clip 2
b. Screw 1 P/O Hardware Kit
c. Screw 2 P/O Hardware Kit
d. E-Ring 1 P/O Hardware Kit
e. Pin 1 P/O Hardware Kit
f. Screw 1

9-66 WorkCentre 6400 Service Manual

Parts List

Parts List 31.0 Optional 500-Sheet Tray 3/4 (4 of 7) - Paper Feed Tray Section

4
2
1 3
9 8
4
8 10

5 7 12
6 a

23
22 14 13

21 5

20
15

19
24
A PL.32.0 17

b
b 18
s6400mfp-431

WorkCentre 6400 Service Manual 9-67

Parts List

Parts List 31.0 Optional 500-Sheet Tray 3/4 (4 of 7) - Paper Feed Tray Section

ID No. Name/Description Part Number Qty. Comments

1. Lifting Plate 1
2. Friction Sheet 1
3. Guide 1
4. Guide 2
5. Pressure Spring 2
6. Shaft 1
7. Gear 14T 1
8. Screw 2
9. Shoulder Screw 1
10. Guide 1
11. Pressure Spring 1
12. Knob 1
13. Lever 1
14. Shaft 1
15. Label 1
16. Lever 1
17. Label Paper Supply 1
18. Bracket 1
19. Detecting Plate 1
20. Guide 1
21. Plate Spring 1
22. Back Stop 1
23. Cassette (Tray) 1
24. Cassette Assy (Tray Assy) 050K68340 1 Complete Tray Assembly
a. E-Ring 1 P/O Hardware Kit
b. Screw 2

9-68 WorkCentre 6400 Service Manual

Parts List

Parts List 32.0 Optional 500-Sheet Tray 3/4 (5 of 7) - Paper Feed Tray Section

c 1
b 22
a
7
e
15 3 e
16 17 d 4

14 5
e 21
f

7 20

9 8
13 12
18 e
19

9
e
e
11
10

A
PL.31.0

s6400mfp-432

WorkCentre 6400 Service Manual 9-69

Parts List

Parts List 32.0 Optional 500-Sheet Tray 3/4 (5 of 7) - Paper Feed Tray Section

ID No. Name/Description Part Number Qty. Comments

1. Separator Roller 1
2. -----
3. Pressure Spring 1
4. Clutch 1
5. Feed Roller 059E10880 1 240K Life
6. -----
7. Bushing 2
8. Front Cover 1
9. Hold Plate 2
10. Tension Spring 1
11. Lever 1
12. Guide Plate 1
13. Guide 1
14. Resistor 1
15. Plate Spring 1
16. Plate Spring 1
17. Shaft 1
18. Guide 1
19. Guide 1
20. K-Clip 019E81520 1
21. K-Clip 005E29580 1
22. Separation Roller Assy 059K70360 1 Complete Assembly
a. Pin 1
b. C-Clip 1
c. C-Clip 1 P/O Hardware Kit
d. C-Clip 1
e. Screw 6 P/O Hardware Kit
f. Washer 1

9-70 WorkCentre 6400 Service Manual

Parts List

Parts List 33.0 Optional 500-Sheet Tray 3/4 (6 of 7) - Wiring Accessories

10 5
2.4
1.3 7.3

4.8
s6400mfp-433

Parts List 33.0 Optional 500-Sheet Tray 3/4 (6 of 7) - Wiring Accessories

ID No. Name/Description Part Number Qty. Comments

1. Cord Clamp
2. Saddle

WorkCentre 6400 Service Manual 9-71

Parts List

Parts List 34.0 Optional 500-Sheet Tray 3/4 (7 of 7) - Accessory Parts

1 2 2

3 3

s6400mfp-434

Parts List 34.0 Optional 500-Sheet Tray 3/4 (7 of 7) - Accessory Parts

ID No. Name/Description Part Number Qty. Comments

1. Cover 848E40140 1
2. Rear LTA Fasteners 029E51120 2
3. Front LTA Fasteners 029E51160 2
4. Label Tray 3/4 1

9-72 WorkCentre 6400 Service Manual

Parts List

Option - Finisher

Parts List 35.0 Cover (1 of 2)

9 (with 1,4,7,8)

1 (with 2, 3)

a 7
8

3 8 4 (with 2, 3, 5, 6)
a

2 7 5

s6400mfp-435

Parts List 35.0 Cover (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Rear Cover Assy 1
2. Cushion 2
3. Cushion 2
4. Front Cover Assy 1
5. Label Staple Supply 1
6. Front Door 1
7. Plate Spring 2
8. Tapping Screw 2
9. Finisher Assy 059K69720 1 Complete Assembly
a. Screw 2

WorkCentre 6400 Service Manual 9-73

Parts List

Parts List 36.0 Cover (2 of 2)

8
3 7
1
2
a
SL2

9
4 6 13 10
16
PS10 12
14
PS9
14

a
s6400mfp-436

9-74 WorkCentre 6400 Service Manual

Parts List

Parts List 36.0 Cover (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Cover Assy 848K25700 1 Includes items 2 & 3
2. Lever Assy 1 Paper Level Lever Actuator
3. Solenoid Assy (SL2) 1 Paper Level Lever
4. Retaining Ring 2
5. Wire Harness Assy (CN17FSCB-SL2) 1
6. Bushing 2
7. Lever 1
8. Tension Spring 1
9. Tapping Screw 1
10. Wire Harness Assy 1
11. Wire Harness Assy 1
12. Cushion 1
13. Cushion 1
14. Photo Interrupter (PS9, PS10) 130E13030 2 PS9 = Paper Level Sensor 1
PS10 = Paper Level Sensor 2
Caution: Connectors to PS9 and PS10
can get swapped. The wiring color is
different, but the plugs are the same.
15. Wire Harness Assy (CN8FSCB-PJ6, PJ7) 1 FSCB to PS9, PS10
16. Cushion 1
a. Screw 2

WorkCentre 6400 Service Manual 9-75

Parts List

Parts List 37.0 Frame

2
1 16
2
a

2 a

a
3

5 2
15

a MS1
12 6
b 7
11 8
13
9

a 15
10 s6400mfp-437

9-76 WorkCentre 6400 Service Manual

Parts List

Parts List 37.0 Frame

ID No. Name/Description Part Number Qty. Comments

1. Bracket 1 Right Plate
2. Tapping Screw 5
3. Bracket 1
4. Wire Harness Assy 1
5. Wire Harness Assy (CN24FSCB-MS1) 1
6. Bracket 1
7. Push Button Switch 1
8. Front Door Switch (MS1) 110K21050 1 Finisher Front Door Switch
(Stapler Cover)
9. Holder 1
10. Screw 1
11. Lever 1
12. Tension Spring 1
13. Lock Assy 1
14. -----
15. Stop Ring 005E29460 2
16. Hook 019E81240 2 Qty 1 when ordered
a. Screw 5
b. Screw 1

WorkCentre 6400 Service Manual 9-77

Parts List

Parts List 38.0 Paper Entrance

1
3
a

a 4
24 2
PL.39.A 22 a
1 5
7
14
6
21 21
20
6
a 21 8
23
a 20 5
21
19 9
19
17 5
18 PS1

16 10 12
a 13
a a 11
16 25
14
15

s6400mfp-438

9-78 WorkCentre 6400 Service Manual

Parts List

Parts List 38.0 Paper Entrance

ID No. Name/Description Part Number Qty. Comments

1. Roller Assy 2
2. Label Prohibition 1
3. Top Cover Assy 848K25710 1 Includes items 1 & 2
4. Top Cover-Right 1
5. Screw 3
6. Cushion 2
7. Cushion 1
8. Guide 1
9. Wire Harness Assy 1
10. Photo Interrupter (PS1) 130E13030 1 Entrance Sensor
11. Torsion Spring 1
12. Actuator 1
13. Bush 1
14. Plate Spring 2
15. Guide 1
16. Neutralizing Brush 3
17. Neutralizing Brush Assy 118K01690 1
18. Tray 050E28920 1 Top Tray
19. Pressure Spring 2
20. Lever 2
21. Roller 4
22. Shaft 1
23. Holder 1
24. Paper Exit Assy 848K31460 1 Includes items 13-15, 19-22
Does not include 38.05
25. Guide Assy 032K09700 1 Includes items 6-12, 23
a. Screw 8

WorkCentre 6400 Service Manual 9-79

Parts List

Parts List 39.0 Paper Transport (1 of 2)

1
2
33 4
32

6
6
28 5
PS4
14 31 30
17 b 29 27 3 SL1
17
25 22 26
d 30 21 7
a c 19 20
b
c 1
25 8
PS3 22
14 23
24 35
34 18 17
9

16 10
A 11
PL.38.24 11
15
PS2 10
14 13
12 s6400mfp-439

9-80 WorkCentre 6400 Service Manual

Parts List

Parts List 39.0 Paper Transport (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Shoulder Screw 2
2. Label Handle 1
3. Neutralizing Brush 1
4. Cover Assy 848K25720 1
5. Solenoid Assy (SL1) 121K50650 1 Entrance Solenoid
6. Tapping Screw 2
7. Tension Spring 1
8. Guide 1
9. Wire Harness Assy (CN14FSCB-SL1) 1
10. Bushing 2
11. Stop Ring 2
12. Torsion Spring 1
13. Actuator 1
14. Photo Interrupter (PS2, PS3, PS4) 130E13030 3 PS2 = Transport Section Sensor
PS3 = Top Cover Sensor
PS4 = Paper Full Sensor
15. Wire Harness Assy (CN6FSCB-PJ9, PJ10) 1 FSCB to PS2, PS3
16. Roller 1
17. Stop Ring 3
18. Gear 32T 1
19. Gear 1
20. Lever 1
21. Pulley 1
22. Pin 2
23. Gear 16T 1
24. Timing Belt 1
25. Collar 2
26. Retaining Ring 1
27. Label Dial 1
28. Collar 1
29. Gear 18T 1
30. Bushing 2
31. Gear 16T 1
32. Sensor Assy 1
33. Wire Harness Assy (CN7FSCB-PS4) 1
34. Bracket Assy 1
35. Roller 1
a. C-Clip 1
b. Pin 2 P/O Hardware Kit
c. E-Ring 2
d. Screw 1

WorkCentre 6400 Service Manual 9-81

Parts List

Parts List 40.0 Paper Transport (2 of 2)

1
2

2 a
3
2
6 3
5 2
3
7 5
3
4
s6400mfp-440

Parts List 40.0 Paper Transport (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Guide 1
2. Neutralizing Brush 4
3. Tapping Screw 4
4. Roller Assy 1
5. Roller Assy 2
6. Roller Assy 1
7. Roller Assy 059K69730 1 Includes items 1-6
a. Screw 2

9-82 WorkCentre 6400 Service Manual

Parts List

Parts List 41.0 Alignment (1 of 2)

1 4

PS6
3 6

PS5
2

M2 PS7

M1 6 5
2

s6400mfp-441

Parts List 41.0 Alignment (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Sensor Assy 130K76010 1 Complete Assembly
2. Photo Interrupter (PS5, PS7) 130E13030 2 PS5 = Paper Ejector Sensor
PS7 = Storage Section Sensor
3. Torsion Spring 1
4. Stop Ring 1
5. Sensor Assy 1
6. Tapping Screw 2

WorkCentre 6400 Service Manual 9-83

Parts List

Parts List 42.0 Alignment (2 of 2)

PL.47.0
D
3
1
1

s6400mfp-442

Parts List 42.0 Alignment (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Paddle 033E05420 1
2. Tension Spring 1
3. Tension Spring 1

9-84 WorkCentre 6400 Service Manual

Parts List

Parts List 43.0 Storage (1 of 2)

2
1
a
P.46
C

s6400mfp-443

Parts List 43.0 Storage (1 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Lever 1
2. Bushing 1
a. C-Clip 1

WorkCentre 6400 Service Manual 9-85

Parts List

Parts List 44.0 Storage (2 of 2)

1
2
d
PL.46.0
B 3

4
5
4
5
6
2
10

a 16
c 12
c
a
14
11
8 7
13 c b
12 9
a 10
15
c
11 s6400mfp-444

9-86 WorkCentre 6400 Service Manual

Parts List

Parts List 44.0 Storage (2 of 2)

ID No. Name/Description Part Number Qty. Comments

1. Gear 14T 1
2. Bush 2
3. Shaft Assy 1
4. Arm 2
5. Pin 2
6. Stopper Ring 1
7. Bushing 1
8. Bracket 1
9. Bushing 2
10. Stop Ring 2
11. Roller 2
12. Collar 2
13. Pulley 22T 1
14. Flange 1
15. Roller Assy 059K69740 1
16. Tapping Screw 1
a. Pin 3
b. Screw 1
c. C-Clip 4
d. E-Ring 1

ID No. Name/Description Part Number Qty. Comments

1. Tension Spring 1
2. Gear 32/18T 1
3. Bracket 1
4. Tapping Screw 2
5. Motor 127E16510 1 M5 = Exit Roller Up/ Down Motor
6. Wire Harness Assy 1
7. Bracket 1
8. Photo Interrupter (PS8) 1 Exit Roller Sensor
9. Solenoid (SD4) 1 Paddle Solenoid
a. C-Clip 1
b. Screw 1
c. Screw 1 P/O Hardware Kit

WorkCentre 6400 Service Manual 9-93

Parts List

Parts List 48.0 Main Tray

1
16
2 18 (with 9-17)
3
14 17 (with 1-8, 16)
M6 PS12
15 4
3 PS13 5

16 6
7
16
8

16 11
10

16
13

12 9
16
s6400mfp-448

9-94 WorkCentre 6400 Service Manual

Parts List

Parts List 48.0 Main Tray

ID No. Name/Description Part Number Qty. Part Number

1. Cover 1
2. Motor (M6) 1 Tray Up/ Down Motor
3. Photo Interrupter (PS12, PS13) 130E13030 2 PS12 = Tray Upper Sensor
PS13 = Tray Lower Sensor
4. Holder 1
5. Lever 1
6. Gear 40T 1
7. Lever 1
8. Holder 1
9. Holder 1
10. Cover 1
11. Wire Harness Assy 1
12. Lever 1
13. Holder 1
14. Tray 1
15. Cushion 1
16. Screw 7
17. Tray Motor Assy 1
18. Tray Assy 050K68350 1 Complete Main Tray Assembly

WorkCentre 6400 Service Manual 9-95

Parts List

Option - Printer Stand

Parts List 49.0 Printer Stand

4
6

3
s6400mfp-743

9-96 WorkCentre 6400 Service Manual

Parts List

Parts List 49.0 Printer Stand

ID No. Name/Description Part Number Qty. Comments

1. Stand Assembly 078K00820 1 Complete Assembly
2. Leg Stand Assy 078K00830 1 Left/ Right Leg Assembly
3. Door Assy 078K00840 1
4. Mounting Kit 604K55040 1
5. Frame Assy 1
6. Cover, Rear 1
7. RePack Kit 650K65000 1 Stand Repackaging Kit (Not shown)

WorkCentre 6400 Service Manual 9-97

Parts List

Xerox Supplies and Accessories

World Kit

Description Part Number

Inbox Kit - 110 V 604K60850

Inbox Kit - 2200 V 604K60860

Consumables and Maintenance Items

Parts List
Part Number
Description Reference

Toner Cartridge (C), High Capacity (12K) 6.19 106R01317

Toner Cartridge (C), Standard Capacity (6K) 106R01320
Toner Cartridge (C), Metered 106R01324
Toner Cartridge (M), High Capacity (12K) 6.20 106R01318
Toner Cartridge (M), Standard Capacity (6K) 106R01321
Toner Cartridge (M), Metered 106R01325
Toner Cartridge (Y), High Capacity (12K) 6.21 106R01319
Toner Cartridge (Y), Standard Capacity (6K) 106R01322
Toner Cartridge (Y), Metered 106R01326
Toner Cartridge (K), High Capacity (12K) 6.22 106R01316
Toner Cartridge (K), Metered 106R01323
Imaging Unit (C), (Up to 30K, 5-page jobs, or 6.23 108R00775
more, simplex, plain paper)
Imaging Unit (M), (Up to 30K, 5-page jobs, or 6.24 108R00776
more, simplex, plain paper)
Imaging Unit (Y), (Up to 30K, 5-page jobs, or 6.25 108R00777
more, simplex, plain paper)
Imaging Unit (K) (Up to 30K, 5-page jobs, or 6.26 108R00774
more, simplex, plain paper)
Waste Cartridge 9.9 106R01368
■ Color (Up to 9K, 5% coverage)

■ Mono: (Up to 36K, 5% coverage)

Fuser Unit 18.1

■ Fuser Unit - 110V 115R00059
■ 150K, continuous

■ 130K, 2-page jobs

■ Fuser Unit - 220V 115R00060

■ 150K, continuous

■ 130K, 2-page jobs

Transfer Roller (Up to 120K) 16.20 108R00815

9-98 WorkCentre 6400 Service Manual

Parts List

Consumables and Maintenance Items (continued)

Parts List
Part Number
Description Reference

Transfer Belt (Up to 120K) 14.16 108R00816

Ozone Filter (Up to 120K) 7.17 108R00815
(bundles with Ozone Filter)
Tray 1 Feed Roller (Up to 120K) 5.29 059E10850
Tray 2 Feed Roller (Up to 120K) 21.27 059E10850
Lower Feed Unit Feed Roller (240K) 32.5 059E10880
Staple Cartridge - 5,000 each (3) N/A 108R00813

Options

Parts List
Part Number
Description Reference

512 MB DDR2 Memory (1 x 512 MB) 20.44 237E24920

Finisher Assy 35.9 059K69720
Foreign Device Interface N/A 097S03872
Lower Tray Unit (500-Sheet Tray 3/4) 28.25 050K68330
Printer Stand 49.1 078K00820

Power Cords

Description Part Number

Power Cord, North America (NEMA 5-15), 125 V, 15A 117E29520

Power Cord, Cable Assy, EUR, 240 V 117E29500
Power Cord, Cable Assy, UK, 240 V 117E29510
Power Cord, Italy, 230V 117E29450
Power Cord, Denmark, 230V 117E29460
Power Cord, India/South Africa, 230V 117E29470
Power Cord, Israel, 230V 117E29480
Power Cord, Australia, 230V 117E29490
Power Cord, China, 220V 117E35030
Power Cord, Argentina, 220V 117E35040
Power Cord, Switzerland, 230V 117E35050

WorkCentre 6400 Service Manual 9-99

Parts List

Service Kits/Tools

Service Kits are developed to provide an easy means to obtain spare parts
normally associated with larger assemblies. A number of Service Kits have
been developed for the WorkCentre 6400. The following tables list the
contents for each kit.

Kits

Hardware Kit

Parts List
Quantity Part Number
Description Reference

Hardware Kit N/A 604K54550

Screw 2 12.0a
Screw 6 10.0c, 12.0c,
20.0a, 45.0b,
47.0c
Tapping Screw 10 2.0a, 4.0a, 6.0a,
7.0a, 9.0b,
10.0a, 11.0b,
12.0f, 13.0a,
14.0a, 19.0c,
20.0b, 22.0a,
23.0c, 28.0b,
29.0d, 30.0c
Tapping Screw 2 3.0a, 10.0d,
15.0c
Tapping Screw 4 4.0d, 6.0c, 7.0b,
9.0c, 11.0e,
12.0g, 18.0b,
20.0d
Screw 8 2.0f, 3.0b, 5.0c,
6.0b, 8.0c, 9.0a,
11.0a, 14.0b,
15.0a, 16.0b,
17.0b, 19.0d,
21.0c, 22.0b,
28.0a, 29.0b,
30.0b, 31.0b,
32.0e
Screw 2 13.0e, 15.0b
E-ring 2 3.0c, 8.0b,
11.0d, 16.0e,
18.0a
E-ring 4 4.0b, 13.0d,
16.0c, 17.0a,
30.0d

9-100 WorkCentre 6400 Service Manual

Parts List

Hardware Kit (continued)

Parts List
Quantity Part Number
Description Reference

E-ring 2 5.0b, 21.0a,

29.0e, 31.0a,
32.0c
Pin 1 19.0b
Pin 1 4.0c, 39.0b
Pin 1 30.0e
Wire Saddle 2 26.04
Clamp 2 26.07
Edge Holder 2 26.09
Steps Screw 1 4.21
Steps Screw 1 20.1

Repack Kit

Parts List Reference Description Part Number

N/A Printer Packaging Kit 695K28270

Tools

Parts List
Part Number
Description Reference

USB Memory with Firmware N/A 237E25350

DADF Registration Calibration Target Sheet N/A 109K02300

WorkCentre 6400 Service Manual 9-101

Parts List

9-102 WorkCentre 6400 Service Manual

Plug/Jack and Wiring
Diagrams
In this chapter...
■ Plug/ Jack Diagrams and Designators
■ Plug/ Jack Locators
■ Notations Used in the Wiring Diagrams
■ Print Engine Wiring Diagrams
■ Options Wiring Diagrams

Chapter
10
Plug/Jack and Wiring Diagrams

Plug/ Jack Diagrams and Designators

This chapter contains the Plug/ Jack Designators, Locators, and wiring
diagrams for the print engine and all options.
The Plug/Jack Locator diagrams show the P/J locations within the printer,
Finisher, Optional 500-Sheet Feeder, Duplex Unit, Fax, Copier, and Scanner.
Use these illustrations to locate P/J connectors called out in the
Troubleshooting procedures presented in Sections 3, 4, and 5.
The Plug/Jack locators consist of the P/J Designator Tables and the P/J
Locator Diagrams.

Plug/Jack and Wiring Diagrams

Map 1 - LVPS (DCPU)

A B C D E F G H I J K L

3 CN_MCB DCPU
CN_SIG DCPU
4 CN_OPN DCPU

5 CN_SCN2 DCPU
CN_FSR DCPU

9
CN_SCN1 DCPU
10

11
CN1_INP DCPU

s6400mfp-506

10-18 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Map 2 - HVPS-1 (HV1)

A B C D E F G H I J K L

BL1 HV1 R1 HV1

19
B2 HV1
B1 HV1
20
BL2 HV1 B3 HV1
CN1 HV1 R2 HV1 BL3 HV1
B4 HV1
21 R3 HV1 BL4 HV1

22 R4 HV1

s6400mfp-507

WorkCentre 6400 Service Manual 10-19

Plug/Jack and Wiring Diagrams

Map 3 - HVPS-2 (HV2)

A B C D E F G H I J K L

34 T2 HV2 C2 HV2
C1 HV2
35 C3 HV2 C4 HV2

36 CN1 HV2

37
G3 HV2

39 G1 HV2 G4 HV2

G2 HV2
40 T1 HV2

s6400mfp-509

10-20 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Map 4 - Image Processor Board

A B C D E F G H I J K L

46
P/J101 IP
P/J102 IP P/J205 IP
47
P/J103 IP
P/J206 IP
48 P/J202 IP P/J208 IP

49 P/J306 IP

50 P/J506 IP (N.C.)
P/J605 IP
51

P/J602 IP
52
P/J507 IP
P/J603 IP
53

A B C D E F G H I J K L

106

107

108 CN15 FSCB

CN14 FSCB
109 CN19 FSCB CN13 FSCB
CN17 FSCB CN12 FSCB
110
CN18 FSCB CN16 FSCB CN11 FSCB
CN10 FSCB

111 CN9 FSCB

112 CN8 FSCB

CN20 FSCB
CN7 FSCB
113
CN21 FSCB
CN6 FSCB
114
CN5 FSCB

115
CN22 FSCB
CN2 FSCB
116 CN23 FSCB
CN26 FSCB (N.C.)
CN24 FSCB CN4 FSCB
117 CN1 FSCB CN25 FSCB (N.C.)

118

119

120

s6400mfp-837

WorkCentre 6400 Service Manual 10-25

Plug/Jack and Wiring Diagrams

Notations Used in the Wiring Diagrams

The following table lists the symbols used in the wiring diagrams.

Symbol Description
Denotes a Plug.

Plug

Denotes a Jack.

Jack

Denotes Pin yy and Jack yy of the connector Pxx

and Jxx.
P/Jxx

Plug and Jack

Denotes the parts.

PL X.Y.Z implies the item “Z” of plate (PL) “X.Y”
Fuser in Parts List.
PL X.Y.Z

Subassembly 1

Denotes functional parts attached with functional

parts name.
Heater

Subassembly 2

Denotes the control and its outline in the Board.

Control

Subassembly 3

Denotes a connection between parts with

harness or wires, attached with signal name/
DEVE_A
contents.

Connection Wire

10-26 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Symbol Description

Denotes the function, and logic value of the

signal to operate the function (Low: L, High: H).
CLUTCH ON(L)+24V The given voltage is for signal in high status.
The arrow indicates the direction of signal.
Function Logic 1

Denotes the function, and logic value of the

signal when the function is operated (Low: L,
EXIT SENSED(L)+3.3VDC
High: H).
The given voltage is for signal in high status.
Function Logic 2
The arrow indicates the direction of signal.

Denotes a connection between wires.

Connection of Wires

Denotes a Clutch or Solenoid.

Solenoid/Clutch

Denotes a Motor.

Motor

Denotes a Photo Sensor.

Optic Sensor

Denotes an On-Off Switch (single-pole, single-

throw switch).

On Off Switch

Represents an interconnection between parts

using wiring harness or wire.

Interconnection

WorkCentre 6400 Service Manual 10-27

Plug/Jack and Wiring Diagrams

Symbol Description

Represents an interconnection which differs

according to the specifications.

Interconnection, Differing

Represents an interconnection between parts

using a conductive part such as a Plate Spring.

Interconnection, Conductive Part

I/L +24 VDC Denotes DC voltage when the Interlock Switch in

the MCU Board turns On.
+5 VDC Denotes DC voltage.
+3.3 VDC
SG Denotes signal ground.
AG Denotes analog ground.
RTN Denotes return.

10-28 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Print Engine Wiring Diagrams

General Wiring Diagram Configurations

1. “General Wiring Diagram - Print Engine” on page 10-30

2. “General Wiring Diagram - Print Engine” on page 10-31
3. “General Wiring Diagram - DADF” on page 10-32
4. “General Wiring Diagram - Scanner” on page 10-32

Print Engine Wiring Diagram Configurations

1. “Print Engine - Duplex Unit, Optional Finisher, Optional 500-Sheet

Feeder” on page 10-33
2. “Print Engine - MCU Board (Engine Control Board), DIMMs” on
page 10-34
3. “Print Engine - Image Processor Board, Laser Drive Boards” on
page 10-35
4. “Print Engine - HVPS-1” on page 10-36
5. “Print Engine - HVPS-2” on page 10-37
6. “Print Engine - Image Processor Board, LVPS, Power Switch” on
page 10-38
7. “Print Engine - Hard Drives, User Interface Board, I/P Board Cooling Fan”
on page 10-39
8. “Print Engine - Fuser, Paper Full Sensor, Exit Sensor, Switches” on
page 10-40
9. “Print Engine - Developer Motors” on page 10-41
10. “Print Engine - Toner Low Sensor Board, Toner Bottles” on page 10-42
11. “Print Engine - Toner Supply Motors, Sensors” on page 10-43
12. “Print Engine - IDC Sensor Boards, Temperature/ Humidity Sensor” on
page 10-44
13. “Print Engine - Waste Toner Sensor, Motors, Fans” on page 10-45
14. “Print Engine - Duplex Unit Control Board” on page 10-46
15. “Print Engine - Duplex Unit Control Board, Transport Motor, Reverse
Motor” on page 10-46
16. “DADF” on page 10-47
17. “DADF” on page 10-48
18. “DADF” on page 10-49
19. “Scanner” on page 10-50
20. “Scanner” on page 10-51

WorkCentre 6400 Service Manual 10-29

Plug/Jack and Wiring Diagrams

General Wiring Diagram - Print Engine

Nottingham Overall Plugs and Jacks Diagram (1 of 2)

Engine
Front Safety Switch (MS2) Control
P/J3 Board P/J31 Toner Supply Motor Y, M (M6)
Right Safety Switch (MS3)
(MCU Board) P/J32 Toner Supply Motor C, K (M7)
Fusing Unit Detect Switch (MS4) P/J7
CN26 Pressure/Retraction Clutch 1 (CL4)
Paper Full CNEXIT1
Sensor (PS14)
CNEXIT CN36 CN27 P/J13 Pressure/Retraction Snr 1 (PS12)
Exit Sensor (PS15) CNEXIT2
P/J9 DC Power Supply Fan Motor (FM11)

Grid Voltage Y G4 HVPS-2 P/J31 P/J34 Scanner Unit Open/Close Snr (PS11)
P.C. Drum Ch. Corona Y *5 C4 CN1 P/J18

Grid Voltage M G3 P/J20 OHP Sensor (PS5)

P/J15
P.C. Drum Ch. Corona M *5 C3
P/J7 Registration Sensor (PS9)
Grid Voltage C G2
P.C. Drum Ch. Corona C *5 C2 CN16 Registration Clutch (CL2)
Grid Voltage K G1 P/J16
P.C. Drum Ch. Corona K *5 C1 P/J4 Paper Loop Sensor (PS10)
2nd Image Transfer T2
P/J25 P/J6 Temperature/Humidity Sensor
1st Image Transfer T1

P/J5 P/J33 Tray 2 Paper Size Switch (SW5)

Tray 1 Paper Empty Sensor (PS7) P/J5 CN15 P/J28
P/J8 IDC Sensor Board Rear
P/J12
Tray 2 Paper Feed Clutch (CL3) CN11
P/J9 IDC Sensor Board Front

Tray 1 Paper Feed Clutch (CL1) CN12 P/J6

P/J27 P/J15 Intermediate Transport Motor
(K PC Drum Motor) (M1)
Exhaust Fan Motor (FM13) CN13

P/J33 P/J21 Developing Motor K (M5)

Right Door Sensor (PS3) P/J10
P/J14 P/J14 Color PC Dum Motor (M3)
Pressure/Retraction Sensor 2 (PS13) P/J11
P/J10 P/J8 P/J16 Developing Motor Y,M,C (M4)
Pressure/Retraction Clutch 2 (CL5) CN17

Front Door Sensor (PS4) P/J3

s6400mfp-021

10-30 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

General Wiring Diagram - Print Engine

Nottingham Overall Plugs and Jacks Diagram (2 of 2)

CN_FSR1A Engine
P/J4
Fusing Unit CN_FSR1B Control P/J16 Thermistor 3
CN_FSR1 CN_FSR Board
DC CN_OPN P/J1 Polygon Motor
Power CN_MBC (MCU Board) P/J22 P/J12

PG1 CN1
Supply CN_SIG
P/J1 Index Board
P/J2
(LVPS)
Power Switch (SW1) P/J19 Tray 2 Paper Empty Sensor (PS8)
CN1_IMP P/J26
P/J18 Waste Toner Sensor (PS6)
P/J38
CN_SCN2 P/J19 P/J17 Fusing Motor (M2)

P/J21 Fusing Fan Motor (FM12)

CN_SCN1

Scanner P/J22 Toner Bottle Y

P/J7
P/J23 Toner Bottle M
P/J29
Image P/J24 Toner Bottle C
Processor P/J101
P/J25 Toner Bottle K
NC HDD
P/J205 Board
P/J402 (IP) P/J102 P/J39 P/J2
P/J13 Toner Low Sensor
NVM
CC HDD
SATA P/J206
P/J801 Module P/J1 Board (TLSB)
Daughter
Board P/J602
P/J35 CN4
FAX CN29A Optional
P/J34 CN29L CN1 Finisher
P/J103 NC DIMM
IP Board Cooling P/J202 P/J208 CC DIMM
Fan Motor (FM15) CN14B
P/J1 P/J11 P/J1 Duplex
P/J603 Ethernet CN14A
P/J2 P/J306
P/J604 USB (Customer)
P/J901 P/J401 P/J24 P/J20 CN25 P/J1 Optional
Control
P/J605 USB (Service) 500-Sheet
P/J301 P/J30 NC
Panel Feeder
(OB)
PJ2 Laser Drive Board (Y) PJ1

CN37 CN_FAN1 Cooling Fan Motor (FM14)

PJ2 Laser Drive Board (M) PJ1
P/J23
PJ2 Laser Drive Board (C) PJ1

PJ2 Laser Drive Board (K) PJ1

High Voltage Unit 1 CN1 P/J17

(HVPS 1)
BL1

BL2

BL3

BL4
R1

R4
B1

s6400mfp-022

WorkCentre 6400 Service Manual 10-31

Plug/Jack and Wiring Diagrams

General Wiring Diagram - DADF

Auto Relay Board 1

Scanner Document
Image P/J3 P/J1 Feeder P/J4 P/J3 Top Cover Sensor (PS 1)
Processor Control
Pick Up Sensor (PS 2)
Board Board P/J4
(IPB) Document Sensor (PS 3)

Paper Interval Sensor (PS 4)

P/J1 Pick Up Clutch (CL 1)

Registration
Sensor P/J2 CN1 Pick Up Solenoid (SD 1)
Exit Sensor (PS 5) P/J3

Transport Motor (M 1) P/J5 Relay Board 2

CN2 P/J3 P/J2 Document Length
Registration Clutch (CL2) P/J8 P/J2
Document Sensor (PS 6)
Width
Switchback Solenoid (SD2) P/J6 Sensor 1

Document
Width
Sensor 2
s6400mfp-917

General Wiring Diagram - Scanner

Auto
Scanner P/J1
Motor (M100) Scanner Document
Scanner Image P/J3 P/J1 Feeder
Control Processor
Scanner Home P/J3 Board Board DC Power
Sensor (PS100)
(SUCB) N/C P/J6 (IPB) P/J7 CN_SCN2
Supply
CN_SCN1
P/J5 P/J4 CN_SCANNER (LVPS)
Inverter CN1 P/J2
P/J4 P/J5
CN_MBC
Board P/J1
(INVB) P/J2
CN2
Image
Control P/J301 P/J306 Processor
Exposure Lamp 1 (LA1) Panel Board
(OB) (IP)
Exposure Lamp 2 (LA2)
s6400mfp-916

10-32 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Print Engine - Duplex Unit, Optional Finisher, Optional 500-Sheet Feeder

Engine Control Optional

Board P/J35 CN29A CN1 Finisher
CTS
(MCU) 6 1 1 (FSCB)
RTS
5 2 2
GND
4 3 3
RXD *2
3 4 4
GND
2 5 5
TXD *1
1 6 6
+24VDC
P/J34 CN29L CN4
GND
2 4 4
+24VDC
1 3 3
NC 2 2
1 1

+5VDC P/J11 CN14B P/J1 Duplex

GND
1 7 7 Unit
DUP_TRANSPORT_M_A
2 6 6
DUP_TRANSPORT_M_B (ADCB)
3 5 5
DUP_TRANSPORT_M_EN
4 4 4
+24VDC +5VDC
5 3 3
DUP_GAIN_CHANGE
6 2 2
+24VDC
7 1 1

CN14A P/J2
GND
8 7 7
DUP_REVERSE_M_A
9 6 6
DUP_REVERSE_M_B
10 5 5
DUP_REVERSE_M_EN
11 4 4
DUP_PIC_SENS
12 3 3
DUP_OPEN_SENS
13 2 2
DUP_SET_DET
14 1 1

+5VDC P/J20 CN25 P/J1 Optional

GND
1 12 12 500-Sheet
+5VDC
2 11 11
RTS Feeder
3 10 10
RXD *2 (PCCB)
4 9 9
TXD *1
5 8 8
CLK
6 7 7
+24VDC GND
7 6 6
GND
8 5 5
+24VDC
9 4 4
+24VDC
10 3 3
GND
11 2 2
GND
12 1 1
s6400mfp-006

WorkCentre 6400 Service Manual 10-33

Plug/Jack and Wiring Diagrams

Print Engine - MCU Board (Engine Control Board), DIMMs

Image P/J103
Processor NC DIMM
Board
(IP)

P/J208
CC DIMM

P/J401 P/J24
COVER_OPEN
26 1 Engine
SLEEP_REM
25 2
GND Control
24 3
23
EDATA_Y
4
Board
22 ENB_DATA_Y 5 (MCU)
GND
21 EDATA_M 6
20 7
ENB_DATA_M
19 8
GND
18 9
EDATA_C
17 10
ENB_DATA_C
16 11
GND
15 12
EDATA_K
14 13
ENB_DATA_K
13 14
GND
12 15
HSYNC
11 16
GND
10 17
CTLDATA
9 18
GND
8 19
CTLBUSY
7 20
GND
6 21
ENGDATA
5 22
GND
4 23
ENGBUSY
3 24
DEEP_SLEEP_REM
2 25
1 TOD 26

Engine Control HVPS-2

Board P/J18 CN1
2nd I.T._PWM*3
(MCU) 17 1 G4
16 2nd I.T._REM*3
2 Grid Voltage Y (White wire/Yellow connector)
2nd I.T._MON*3
15 3
2nd I.T._ATVC*3*6 C4
14 4 P.C. Drum Ch. (Red wire/Yellow connector)
13 1st P.C._REM*5 Corona Y *5
5 G3
12 2nd P.C._REM*5
6 Grid Voltage M (White wire/Red connector)
11 1st I.T._ATVC*3*6
7 C3
NC
10 8 P.C. Drum Ch. (Red wire/Red connector)
1st I.T._PWM*3
9 9 G2 Corona M *5
1st I.T._REM*3
8 10 Grid Voltage C (White wire/Blue connector)
GND
7 11
GND C2
6 12 P.C. Drum Ch. (Red wire/Blue connector)
+24VDC NC Corona C *5
5 13 G1
NC
4 14
+24VDC Grid Voltage K (White wire/White connector)
3 15
+24VDC C1
2 16 P.C. Drum Ch. (Red wire/White connector)
+24VDC
1 17 T2 Corona K *5
2nd Image Transfer (White wire/Red connector)
T1
+5VDC 1st Image Transfer (White wire/White connector)
P/J28 CN15 P/J5
+5VDC
1 1 3 PS7
GND
2 2 2 Tray 1 Paper
3 PS7_ON 3
PS7_SET
1 Empty Sensor
4 4
GND
Interlock 5 5
+24VDC

P/J6 CN11
+24VDC CL3
1 2
2 CL3_ON 1 Paper Feed Clutch 1
CN12
+24VDC
3 2 CL1
4 CL1_ON 1 Paper Feed Clutch 2
CN13
FM13_ON
5 3 FM13
GND
6 2 Exhaust Fan Motor
FM13_LOCK
7 1
s6400mfp-009

WorkCentre 6400 Service Manual 10-37

Plug/Jack and Wiring Diagrams

Print Engine - Image Processor Board, LVPS, Power Switch

Engine Control DC Power

Board P/J2 CN_SIG Supply
HEATER1_REMA
5 1 Board CN_FSR CN_FSR1
HEATER2_REMA
4 2 (LVPS) NUT2
HEATER_PROTECT 6 1
3 4
POW_REM 5 NC 2 Fusing
2 5 NUT1
24V2_REM 4 3
1 9 Unit
3 NC 4
N.C. 3 HOT
2 5
N.C. 6 HOT
1 6
N.C. 7
N.C. 8 CN1_INP
N.C. 10 L
2 SW1
11 N
N.C. 1
Power
P/J1 CN_MBC Switch
GND
10 1
GND
9 2
+24VDC CN1 PG1
8 3
+24VDC 1
7 4
+24VDC 2
6 5
+24VDC 3
5 6
GND
4 7
GND
3 8
+5VDC
2 9
+3.3VDC CN_SCN1 P/J102
1
CN_OPN +24VDC 6 Image
8
7 GND 5 Processor
N.C. 4
6
GND 4 Board (IP)
3 +5VDC 3
N.C. 2 5
To MCU Board 2
1 P/J39 1
CN_SCN2
GND 1
P/J101
GND 1
2
+3.3VDC +3.3VDC 2
3 4
+3.3VDC +3.3VDC 3
P/J38 4 3
+11VDC GND 4
1 5 2
GND GND 5
2 6 1
GND 6
7 GND
+24VDC 7
8
8
N.C. 9

GND
+3.3VDC
CN_SCANNER P/J7
+11VDC +5VDC 1 1
3 GND 2 2
GND
4 +11VDC 3 3 Scanner
GND 4 4 Image
+24VDC 5 5 Processor
GND 6 6 Board (IPB)
+3.3VDC 7 7
GND
8 8
s6400mfp-008

10-38 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Print Engine - Hard Drives, User Interface Board, I/P Board Cooling Fan

Image P/J205
Processor 1 NC Hard
Board Drive
(IP)
4
P/J402
1

P/J206
1 CC Hard
Drive
4
P/J602
1 SATA
Daughter
Board
7

Fax
Board

+5VDC P/J202
FM5_LOCK
3 FM15
GND
2 IP Board Cooling
+5VDC
1 Fan Motor

s6400mfp-012

WorkCentre 6400 Service Manual 10-39

Plug/Jack and Wiring Diagrams

Print Engine - Fuser, Paper Full Sensor, Exit Sensor, Switches

Engine Control
Board (MCU)
+24VDC

Plug/Jack and Wiring Diagrams

Print Engine - IDC Sensor Boards, Temperature/ Humidity Sensor

Engine Control
Board PJ16 CN16 CL2
CL2_ON
(MCU) 5 2 Registration
+24VDC
4 1 Clutch
P/J4
+5VDC PS10_ON
3 1 PS10
GND
2
+5VDC
2 Paper Loop
1 3 Sensor

P/J25 P/J6
TEM_ON
4 1
+5VDC GND Temperature/
3 2
HUMS_ON Humidity Sensor
2 3
+5VDC
1 4

P/J5 P/J33
SIZE2 1
4 SW5
GND
3 2
SIZE1 Tray 2 Paper Size
2 3
1
SIZE0
4 Switch

P/J12 P/J8
IDCSB/R_V01 (REG)
1 5
+5VDC IDCSB/R_V02 (L)
2 4 IDC Sensor
GND
3 3 Board Rear
+5VDC
4 2
IDCSB/R_VREF (IDCB/R)
5 1

P/J9
IDCSB/F_V01 (REG)
6 5
+5VDC IDCSB/F_V02 (L)
7
GND
4 IDC Sensor
8 3 Board Front
+5VDC
9 2
IDCSB/F_VREF (IDCB/F)
10 1

P/J37 CN_FAN1
FM14_ON
1 1 FM14
GND
2 2 Cooling
LOCK
3 3 Fan Motor
s6400mfp-002

10-44 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Print Engine - Waste Toner Sensor, Motors, Fans

Engine Control
Board (MCU) P/J22 P/J16
GND
11 3 TH3
TH3_ON
10 2 Thermistor 3
P/J12
CLK
9 5
LOCK
8 4 M8
+24VDC REM M
7 3
GND Polygon
6 2
+24VDC
1
Motor
5
+5VDC

P/J1
+5VDC
4 1 Index Board
SOS
3 2 (INDEXB)
GND
2 3
CHANGE
1 4

P/J26 P/J19
+5VDC PS8_ON PS8
6 1
GND
5 2 Paper Empty
+5VDC
4 3 Sensor
P/J18
PS6_LED
3 1 PS6
+5VDC
2
PS6_ON
2 Waste Toner
1 3 Sensor

P/J19 P/J17
CHANGE
7 1
LOCK
6 2
CLK
5 3 M2
NC
4 4 M Fusing Motor
+24VDC REM
3 5
GND
2 6
+24VDC
1 7

P/J21
FM12_LOCK FM12
3
GND Fusing
2 FM12_ON
1 Fan Motor
s6400mfp-004

WorkCentre 6400 Service Manual 10-45

Plug/Jack and Wiring Diagrams

Print Engine - Duplex Unit Control Board

Duplex Control
Door Sensor (PS16) P/J25 P/J4 Board CN14A Printer
P/J1
(ADCB) CN14B
Reverse Motor (M9) P/J23 P/J3
P/J2 P/J22 Transport Motor (M8)
s6400mfp-024

Print Engine - Duplex Unit Control Board, Transport Motor, Reverse Motor

Duplex Control
Board (ADCB) P/J1A CN14A P/J11
DUP_SET_DET
1 14
Printer
14
DUP_OPEN_SENS
13 2 13
DUP_PIC_SENS
12 3 12
DUP_REVERSE_M_EN
11 4 11
DUP_REVERSE_M_B
10 5 10
+24VDC
DUP_REVERSE_M_A
9 6 9
GND
8 7 8

CN14B
+5VDC +24VDC
7 1 7
DUP_GAIN_CHANGE
6 2 6
+5VDC
5 3 5
DUP_TRANSPORT_M_EN
4 4 4
DUP_TRANSPORT_M_B
3 5 3
DUP_TRANSPORT_M_A
2 6 2
GND
1 7 1

P/J2 P/J22
DUP_TRANSPORT_M_B
4 1
DUP_TRANSPORT_M_B M1
3 2
DUP_TRANSPORT_M_A M Transport
2 3
DUP_TRANSPORT_M_A Motor
1 4
+5VDC

P/J4 P/J25
+5VDC PS16
1 3
GND
2 2 Door
PS16_ON
3 1 Sensor

P/J3 P/J23
DUP_REVERSE_M_A
4 1
DUP_REVERSE_M_A M2
3 2 M
DUP_REVERSE_M_B Reverse
2 3
DUP_REVERSE_M_B Motor
1 4
s6400mfp-015

10-46 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

DADF

Scanner Image Scanner Unit

Processor P/J4 P/J5 Control Board
GND
Board (IPB) 1
LAMP OUT
1 (SUCB)
2 2
GND
3 3
GND
4 FB STEP 4
5 5
GND
6 6
FB VREF1
7 7
FB VREF2
8 FB MS1 8
9 9
FB MS2
10 10
FB M RST
11 11
FB ENABLE
12 FB DIR 12
13 13
GND
14 14
FB HMSEN
15 15
+3.3VDC
16 24VM FB 16
17 17
GND
18 18

P/J3 P/J1 Auto

1 1 Document
+24VDC
2 2 Feeder
GND
3
+3.3VDC
3 Control
4 ADF_COVER_OPEN 4 Board
5 5 (ADCB)
ROLLER_SENSOR
6 6
PAPER_GAP
7 7
DESKEW_SENSOR
8 PAPER_SIZE3 8
9 PAPER_SIZE1 9
10 10
GND
11 GND 11
12 OUT1A 12
13 13
OUT2A
14 14
+24VDC
15 15
+24VDC
16 GND 16
17 17
FB_COVER_OPEN
18 PAPER_DETECT 18
19 19
PAPER_JAM
20 20
PAPER_OUT
21 21
PAPER_SIZE4
22 22
PAPER_SIZE2
23 23
+5VDC
24 24
I_ADF_PLUG
25 25
GND
26 26
OUT1B
27 27
OUT2B
28 28
s6400mfp-920

WorkCentre 6400 Service Manual 10-47

Plug/Jack and Wiring Diagrams

DADF

Auto Document
Feeder Control
Board (DFCB)
+5VDC
P/J3
+5VDC
1 PS5
PS5_ON
2
GND
Exit Sensor
3

P/J5 M1
OUT1A
1 Transport
OUT2A
2 OUT1B M Motor
3
OUT2B
+24VDC 4

P/J8 CL2
+24VDC
1 Registration
GND
2 Clutch
+24VDC

P/J6 SD2
+24VDC
1 Switchback
GND
2 Solenoid
3 N.C.
Relay Board 2
P/J2 CN2 P/J3
+5VDC +5VDC
1 1 1
2
GND
2 2 P/J2
PAPERSIZE1 +5VDC
3 3 3 1 PS6
PAPERSIZE2 PS6_ON
4 4 4 2 Document
5 PAPERSIZE3 5 5 GND
PAPERSIZE4
3 Length
6 6 6
ADF_TRAY Sensor
7 7 7

SS1
Document
Width
Sensor 1

SS2
Document
Width
Sensor 2
s6400mfp-923

10-48 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

DADF

Relay Board 1
+5VDC
Auto Document P/J4
Feeder Control +5VDC
PS1
1
Board (DFCB) PS1_ON
2
GND
Top Cover
3 Sensor
+24VDC +3.3VDC
+5VDC
4 PS2
+5VDC +3.3VDC PS2_ON
1
GND
1 5
GND
Pick Up
2
+5VDC
2 6 Sensor
3 3
+24VDC
4 4 +5VDC
GND 7 PS3
5 5 PS3_ON
+24VDC 8
GND
Document
6 6
7
PAPER_JAM
7
9 Sensor
PAPER_DETECT
8 8
DESKEW_DETECT +5VDC
9 9 10 PS4
ROLLER_SENSOR PS4_ON
10
PAPER_GAP
10 11
GND
Paper Interva
11
ADF_COVER_OPEN
11 12 Sensor
12 12
+24VDC

P/J1 CL1
+24VDC
1 Pick Up
GND
2 Clutch
+24VDC

P/J2 CN1 SD1

+24VDC
1 1 Pick Up
GND
2 2 Solenoid
N.C.
3 3

ISO1
Registration
Sensor
s6400mfp-924

WorkCentre 6400 Service Manual 10-49

Plug/Jack and Wiring Diagrams

Scanner

Scanner Control
Board P/J1
OUT1A
(SUCB) 1
OUT2A
2 M100
OUT1B M
3 Scanner Motor
OUT2B
+5VDC 4

P/J3
+5VDC
1 3 PS100
PS100_ON
2 2 Scanner Home
GND
3 1 Sensor

+24VDC Inverter
P/J2 CN1 Board (INVB) CN2
+24VDC Exposure
1 2 1
GND Lamp 2 (LA2)
2 1 2
3
4
5 Exposure
6 Lamp 1 (LA1)
P/J4 P/J5
GND Scanner Image
1 1
INCLK+ Processing
2 2
INCLK- Board (IPB)
3 3
GND
4 4
TXCLK+
5 5
TXCLK-
6 6
GND
7 7
TXOUT2+
8 8
TXOUT2-
9 9
GND
10 10
TXOUT1+
11 11
TXOUT1-
12 12
GND
13 13
TXOUT0+
14 14
TXOUT0-
15 15
GND
16 16
SLOAD
17 17
SCLK
18 18
SDATA
19 19
98714_SH_R
20 20
GND
21 21
5V_LVPS
22 22
24V_CCD
23 23
24V_CCD
24 24
s6400mfp-919

10-50 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Scanner

Scanner Image Scanner Unit

P/J3 P/J1 Auto

WorkCentre 6400 Service Manual 10-51

Plug/Jack and Wiring Diagrams

Options Wiring Diagrams

Optional 500-Sheet Feeder Wiring Diagram Configurations

1. “Optional 500-Sheet Feeder Board” on page 10-52

2. “Tray 3/4 Optional 500-Sheet Feeder Board” on page 10-53

Finisher Wiring Diagram Configurations

1. “Finisher Control Board (FSCB)” on page 10-54

2. “Finisher - Sensors” on page 10-55
3. “Finisher - Stapler Cover Switch, Sensors” on page 10-56
4. “Finisher - Motors, Sensors” on page 10-57
5. “Finisher - Solenoids, Motors” on page 10-58
6. “Finisher - Fan and Align Motors, Entrance Solenoid” on page 10-59

Optional 500-Sheet Feeder Board

LTA Circuit
Paper Size Switch (SW6) P/J27 P/J4 Board P/J30 Paper Empty Sensor (PS22)
(PCCB)
Tray 3/4 P/J5 P/J29 Paper Feed Sensor (PS23)
CN24 P/J2
(if present) P/J28 Right Door Sensor (PS24)

Printer CN25 P/J1

P/J6 CN29 Paper Feed Clutch (CL6)
P/J3 Transport Motor (M16)
s6400mfp-025

10-52 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Tray 3/4 Optional 500-Sheet Feeder Board

Feeder Board
P/J1
(PCCB) 13 NC CN25 P/J20
+24VDC
12
GND
1 1
Printer
GND
11 2 2
+24VDC
10 3 3
+24VDC
9 4 4
AI1
8 5 5
AI0
7 6 6
CLK
6 7 7
TXD*1
5 8 8
+5VDC RXD*2
4 9 9
RTS
3 10 10
+5VDC
2 11 11
GND
1 12 12

P/J5 P/J30
+5VDC PS22_ON
9 1 PS22
GND
8
+5VDC
2 Paper Empty
7 3 Sensor
P/J29
PS23_ON
6 1 PS23
GND
5 +5VDC 2 Paper Feed
4 3 Sensor
P/J28
PS24_ON
3 1 PS24
GND
2 +5VDC 2 Right Door
1 3 Sensor
+24VDC PJ6 CN29 CL6
CL6_REM
2 1
+24VDC Paper Feed
1 2
Clutch
P/J3
B
4 A M16
3 B M Transport
2
1
A Motor

P/J4 P/J27
SIZE1 4
1
2
SIZE2 3 SW6
SIZE4 Paper Size
3 2
SIZE3
4 1 Switch
+24VDC P/J2 CN25 P/J1
GND 2nd Lower Tray
12 1 1
GND
11
+24VDC
2 2 Assembly
10 3 3 (If Present)
+24VDC
9 4 4
AI1
8 5 5
AI0
7 6 6
CLK
6 7 7
TXD*1
5 8 8
+5VDC RXD*2
4 9 9
RTS
3 10 10
+5VDC
2 11 11
GND
1 12 12
s6400mfp-014

WorkCentre 6400 Service Manual 10-53

Plug/Jack and Wiring Diagrams

Finisher Control Board (FSCB)

P/J20 Finisher
Staple Unit CN9 CN23 Control CN2 P/J11 Exit Roller Sensor (PS8)
P/J19 Board
(FSCB) P/J10 Finisher Cover Sensor (PS3)
Tray Up/Down Motor (M6) P/J18 CN6
P/J9 Transport Section
CN22
Sensor (PS2)
Main Tray Sensor (PS13) P/J17 CN8
CN5
CN7 P/J8 Paper Full Sensor (PS4)
Sub Tray Sensor (PS12) P/J16

P/J7 Paper Level Sensor 2 (PS10)

Paper Ejector Motor (M1) P/J15 CN21
CN8 CN1

Exit Roller
P/J6 Paper Level Sensor 1 (PS9)
P/J14 CN20
Up/Down Motor (M5) P/J5 Paper Ejector Sensor (PS5)
Aligning Belt CN19
Up/Down Solenoid (SL3) CN9 P/J4 Aligning Plate Home
Position Sensor (PS6)
Paddle Solenoid (SL4) CN18
P/J3 Storage Section Sensor
Paper Level CN17
(PS7)
CN7
Lever Solenoid (SL2)
CN10 P/J2 Entrance Sensor (PS1)
Exit Motor (M4) P/J13 CN16
CN11 P/J1 Aligning Belt Sensor (PS11)
Transport Motor (M3) P/J12 CN15
CN24 Stapler Cover Switch
Entrance Solenoid (SL1) CN6 CN14
CN4 CN3
Printer
Fan Motor (FM1) CN5 CN13 CN1 CN2

Align Motor (M2) CN4 CN12 CN25

CN26
s6400mfp-023

10-54 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Finisher - Sensors

Finisher Control
Board (FSCB) CN2
4 NC P/J11
+5VDC PS8_ON
3 1 PS8
GND
2 2 Exit Roller
+5VDC
1 3 Sensor
CN6
8 NC
7 NC P/J10
+5VDC PS3_ON
6 1 PS3
GND
5
+5VDC
2 Finisher Cover
4 3 Sensor
P/J9
PS2_ON
3 1 PS2
GND
2
+5VDC
2 Transport Section
1 3 Sensor
CN7
5 NC
4 NC P/J8
+5VDC PS4_ON
3 1 PS4
GND
2
+5VDC
2 Paper Full
1 3 Sensor
CN8 CN1 P/J7
+5VDC PS10_ON
6 1 1 PS10
GND
5
+5VDC
2 2 Paper Level
4 3 3 Sensor 2
P/J6
PS9_ON
3 4 1 PS9
GND
2
+5VDC
5 2 Paper Level
1 6 3 Sensor 1
CN9 P/J5
+5VDC PS5_ON
9 1 PS5
GND
8
+5VDC
2 Paper Ejector
7 3 Sensor
P/J4
PS6_ON
6 1 PS6
5 GND
+5VDC
2 Aligning Plate Home
4 3 Position Sensor
P/J3
PS7_ON
3 1 PS7
GND
2
+5VDC
2 Storage Section
1 3 Sensor
s6400mfp-016

WorkCentre 6400 Service Manual 10-55

Plug/Jack and Wiring Diagrams

Finisher - Stapler Cover Switch, Sensors

Finisher
Control Board
(FSCB) CN4 CN3
RTS Printer
6 1
CTS
5 2
GND
4 3
TXD*2
3 4
GND
2 5
RXD*1
1 6

CN1 CN2
+24VDC GND
3 4
GND
2 2
+24VDC
1 1
GND
3

CN10 P/J2
+5VDC PS1_ON
3 1 PS1
GND
2
+5VDC
2 Entrance
1 3 Sensor
CN11
4 NC P/J1
+5VDC PS11_ON
3 1 PS11
GND
2 +5VDC 2 Aligning Belt
1 3 Sensor
+24VDC

CN24
+24VDC MS1
2 +24VDC Stapler Cover
1
Switch
s6400mfp-017

10-56 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Finisher - Motors, Sensors

CN22 CN8 P/J18

+ M6
1 1 1
- M Tray Up/Down
2 2 2
Motor
3 NC

CN5 P/J17
+5VDC PS13_ON
1 3 1 PS13
GND 4
2 2 Tray Lower
+5VDC 5
3 3 Sensor
P/J16
PS12_ON
4 6 1 PS12
GND 7
5 2 Tray Upper
+5VDC 8
6 3 Sensor
7 NC

CN21 P/J15
B
6 6
B
+24VDC
5 5 M1
A
4
A
4 M Paper Ejector
3 3 Motor
+24VDC
2 2
+24VDC
1 1
+24VDC

CN20 P/J14
+24VDC
6 6
+24VDC
5 5 M5
A
4
A
4 M Exit Roller
3 3 Up/Down Motor
B
2 2
B
1 1
s6400mfp-018

WorkCentre 6400 Service Manual 10-57

Plug/Jack and Wiring Diagrams

Finisher - Solenoids, Motors

Finisher Control
Board +24VDC CN19
(FSCB) SL3 ON SL3
2 +24VDC Aligning Belt
1
Up/Down Solenoid
CN18
4 NC
+24VDC
3 NC
SL4 ON
2 +24VDC
SL4
1 Paddle Solenoid
CN17 CN7
+24VDC
3 NC 1
SL2 ON SL2
2 2
+24VDC
3
Paper Level
1
+24VDC Lever Solenoid
CN16 P/J13
+24VDC
8 5
+24VDC
7 2 M4
A
5
A
6 M Exit
4 4 Motor
B
3 1
B
2 3
6 NC
+24VDC
1 NC

CN15 P/J12
+24VDC
7 5
+24VDC
6 2 M3
A
4 4 M Transport
A
3 6 Motor
B
2 1
B
1 3
5 NC
s6400mfp-019

10-58 WorkCentre 6400 Service Manual

Plug/Jack and Wiring Diagrams

Finisher - Fan and Align Motors, Entrance Solenoid

Finisher
Control Board
(FSCB)
+24VDC CN14 CN6
SL1 ON SL1
2 1
+24VDC Entrance
1 2
Solenoid
CN13
5 NC
4 NC CN5
+24VDC GND
3 1
2
FM1_LOCK
2
FM1
1
+24VDC
3 Fan Motor

CN12
5 NC CN4
B
4 1
B
2 M2
3
A M Align
2 3
A
1 4 Motor

s6400mfp-020

WorkCentre 6400 Service Manual 10-59

Plug/Jack and Wiring Diagrams

10-60 WorkCentre 6400 Service Manual

Reference
Contents...
■ Firmware Update
■ Back Channel Traces
■ Fault Codes
■ Status Codes
■ NVM Value
■ WorkCentre 6400 Menu Map
■ Internal Page Samples
■ Fax Communication Commands Definitions
■ Acronyms and Abbreviations

Appendix
A
Reference

Firmware Update

Note
When performing a manual upgrade, use the WebUI to download the .dlm
file or use the USB upgrade process before using the AltBoot process.

The AltBoot process should only be used to recover a printer that has
corrupted software preventing one of the other upgrade methods from
being utilized.

Send DLM File via the WebUI

The WebUI method allows the user to perform the firmware update process
using CWIS menu.

Note
Be sure to download the appropriate firmware file from the Xerox support
web site.

1. Enter the printer’s IP address.

2. Click the Login button.
3. In the User ID field, enter admin (default User ID).
4. In the Password field, enter 1111 (default password).
5. Click Login.
6. From the top menu, click the Properties button.
7. From the Properties menu on the left, expand General Setup.
8. Under Machine Software, select Manual Upgrade.
9. Click the Browse button to locate the .dlm file.
10. Click the Open button.
11. Click the Install Software button to download the firmware to the printer.

Note
It takes several minutes for the Network Controller to download the DLM
file.

12. A progress bar appears on the bottom of the web browser.

13. A File has been submitted window appears on screen.
14. The UI displays the Software Upgrade screen with no progress bars.
15. The Copy Controller reboots and the scanner initializes.
16. The UI displays the Software Upgrade screen with the following progress
bars:
■ Scan Engine
■ Copy Controller
■ Print/Copy Engine
■ Finishing
■ Network Controller

A-2 WorkCentre 6400 Service Manual

Reference

17. The firmware update process is as followed:

a. Copy Controller updates
b. Network Controller updates
c. Scan Engine updates
d. Print/Copy Engine updates
e. Network Controller finishes updating
18. When the firmware update process is complete, the printer will reboot.
19. The printer will continue initializing and print the Software Upgrade
Report, followed by the Configuration Report.

USB Upgrade

The USB upgrade method allows the user to perform the firmware update
process using a USB Thumb Drive.
Verify the data on the USB Thumb Drive: an Upgrade folder, in the root
directory, with a file with extension .dlm.
1. Be sure the printer is at Ready status.
2. Connect the USB Thumb Drive to the USB connector on the rear of the
printer.
3. The touch screen automatically displays the Software Upgrade Screen.
4. A progress bar is displayed once the upgrade has started.

Caution
Do not turn Off the printer while the printer is loading software.

5. When the upgrade is complete, the display shows a message asking you
to remove the memory stick and press 0 to Reboot.
6. Disconnect the USB Thumb Drive from the printer.
7. Press the 0 button to reboot the printer.
8. The printer reboots and prints a Software Upgrade Report in addition to
any other power on pages, such as the Configuration Page.
9. Verify the information on the Configuration Page to ensure that firmware
has been upgraded.

WorkCentre 6400 Service Manual A-3

Reference

USB ALTBOOT

Caution
Only perform this procedure as a last option to recover a corrupted
system. The .dlm file for machine configuration will be deleted.

The AltBoot procedure will delete all stored data on the System Disk
Drive, including email addresses, Xerox Standard Accounting data, and
network configuration information. Always clone the machine, if possible,
before performing AltBoot. If the machine failure is such that cloning is not
possible, ensure that the customer is aware of the data loss.
The USB ALTBOOT method allows the user to perform the firmware update
process using a USB Thumb Drive.
Verify the data on the USB Thumb Drive: an Altboot folder, in the root
directory, with a file with extension .dlm.
1. Turn the printer Off.
2. Connect the USB Thumb Drive to the USB connector on the rear of the
printer.
3. Turn the printer On.
4. On the printer’s Control Panel, verify that the LEDs (under the Features,
Job Status, and Machine Status buttons) come On for a short time.
5. The LED on the Machine Status button comes on again, by itself, for
about 20 seconds. While it is lit, press and release it, then within 5
seconds press the 8 button.
6. The firmware update process begins.
7. On the UI screen, a Software Upgrade screen is displayed. The process
takes approximately 20 minutes.
8. After the firmware update process is complete, the Alt Boot Complete
screen is displayed.
9. Disconnect the USB Thumb Drive from the printer.
10. The printer reboots.
11. A Configuration page is printed.

A-4 WorkCentre 6400 Service Manual

Reference

Back Channel Traces

In rare cases, the printer may exhibit unusual behavior that is difficult to
troubleshoot. In such cases, if feasible, it can be useful to obtain a back
channel trace from the printer’s Serial Debug Port. The back channel trace,
lists step-by-step what the printer is doing up to the point that an error occurs.
The trace may offer clues to help troubleshoot the problem.
The WC6400 has two back channel ports on the image processing board; one
for the copy controller (J507) and one for the network controller (J505).
Determine which region of the controller is experiencing the problem and
capture the appropriate trace by the following procedure.

Note
The “This Side Up” label on the 5 pin connector faces towards the right
side (looking at the I/P Board from the rear of the printer).

P/J507

P/J505

s6400mfp-950

Required Parts:

■ Computer with a serial port

■ Serial Cable, part number: 600T80374

■ Level Adaptor, part number: 600T80375

To obtain a trace:
1. Connect the Serial Cable and Level Adaptor, then connect the Serial
Cable to your PC. Serial port settings are COM1, 19.2 kbaud, 8 bits, no
parity, 1 stop bit, and hardware control.
2. Turn Off the printer.
3. Connect the Level Adaptor with adapter’s THIS SIDE UP label facing
upwards to the Serial Debug Port located on the printer’s Rear Panel.
4. Start up a terminal program such as in Window’s HyperTerminal (usually
located in Programs -> Accessories -> Communications ->
HyperTerminal). Verify the serial port settings are correct, usually
COM1:.
6. Turn On the printer.
7. The trace should appear in the terminal window. Examine the trace to
troubleshoot the problem. Save the trace as a file, if necessary.

WorkCentre 6400 Service Manual A-5

Reference

Fault Codes

The following Fault Codes may appear when an error occurs.

Soft Faults

Hard Faults

Reference

Fault Codes (Continued)

Fault History in Diagnostic

Fault Code Action
Display String

316.017.19 Send Event Failure Unable to send event Refer to “Internal Communication
to NC ENS Error” on page 3-119.
316.021.19 NC PM REGISTRATION CONNECT Refer to “Internal Communication
ERROR Error” on page 3-119.
316.021.26 Service could not get Host Name Refer to “Internal Communication
Error” on page 3-119.
316.021.46 Unable to Get Host Name Refer to “Internal Communication
Error” on page 3-119.
316.023.09 RPC Call Failure to ENS Refer to “Internal Communication
Error” on page 3-119.
316.023.26 RPC Call Failure to ENS Refer to “Internal Communication
Error” on page 3-119.
316.026.09 Memory allocation failure Refer to “Internal Communication
Error” on page 3-119.
316.026.14 MALLOC error Refer to “Internal Communication
Error” on page 3-119.
316.026.46 Memory Allocation Error Refer to “Internal Communication
Error” on page 3-119.
316.026.90 Malloc Error Refer to “Internal Communication
Error” on page 3-119.
316.026.92 Memory Allocation Fault Refer to “Internal Communication
Error” on page 3-119.
316.027.90 Unable to obtain well known Queue ID Refer to “Internal Communication
Error” on page 3-119.
316.028.09 Unable to complete RPC call Refer to “Internal Communication
Error” on page 3-119.
316.028.90 Invalid Range String Refer to “Internal Communication
Error” on page 3-119.
316.030.19 Unable to Obtain Client RPC handle to Refer to “Internal Communication
EJS Error” on page 3-119.
316.031.09 Invalid Event Notification Received Refer to “Internal Communication
Error” on page 3-119.
316.032.19 NVM Connection Failure Refer to “Internal Communication
Error” on page 3-119.
316.039.00 Pthread Create Error Refer to “Internal Communication
Error” on page 3-119.
316.040.92 Semaphore Fault Refer to “Internal Communication
Error” on page 3-119.
316.048.09 Unable to set binding Refer to “Internal Communication
Error” on page 3-119.
316.048.14 Can not set NC client binding Refer to “Internal Communication
Error” on page 3-119.
316.048.90 Can not set NC client binding Refer to “Internal Communication
Error” on page 3-119.

A-14 WorkCentre 6400 Service Manual

Reference

Fault Codes (Continued)

316.601.67 Unable to do start up synchronization Refer to “Power Cycle the Printer”

on page 4-57.
316.601.68 Unable to start up & sync with SC. Refer to “Power Cycle the Printer”
on page 4-57.
316.601.105 Unable to do start up synchronization Refer to “Power Cycle the Printer”
on page 4-57.
316.602.07 RPC Service Registration Failure Refer to “Power Cycle the Printer”
on page 4-57.
316.602.09 Unable to unregister as RPC service Refer to “Power Cycle the Printer”
on page 4-57.
316.602.11 RPC Server Registration failed Refer to “Power Cycle the Printer”
on page 4-57.
316.602.28 RPC Server Registration failed Refer to “Power Cycle the Printer”
on page 4-57.
316.602.35 RPC Server Registration Refer to “Power Cycle the Printer”
on page 4-57.
316.602.38 RPC Server Registration Failed Refer to “Power Cycle the Printer”
on page 4-57.
316.602.66 Unable to Register as an RPC Server Refer to “Power Cycle the Printer”
on page 4-57.
316.602.67 Unable to Register as an RPC Server Refer to “Power Cycle the Printer”
on page 4-57.
316.602.68 Unable to Register as an RPC Serve Refer to “Power Cycle the Printer”
on page 4-57.
316.602.105 Unable to Register as an RPC Server Refer to “Power Cycle the Printer”
on page 4-57.
316.603.11 Replace Handler call failed Refer to “Power Cycle the Printer”
on page 4-57.
316.603.28 Replace Handler call failed Refer to “Power Cycle the Printer”
on page 4-57.
316.603.46 Too many IPC Handles Refer to “Power Cycle the Printer”
on page 4-57.
316.603.66 Replace Handler call failed Refer to “Power Cycle the Printer”
on page 4-57.
316.603.67 Too many IPC Handlers Refer to “Power Cycle the Printer”
on page 4-57.
316.603.68 Too many IPC Handlers Refer to “Power Cycle the Printer”
on page 4-57.
316.603.105 RPC call failure to NC registration Refer to “Power Cycle the Printer”
service. on page 4-57.
316.604.14 RPC call failure to NC registration service Refer to “Power Cycle the Printer”
on page 4-57.
316.604.38 Could not register with Registration Refer to “Power Cycle the Printer”
Service. on page 4-57.

WorkCentre 6400 Service Manual A-17

Reference

Fault Codes (Continued)

Fault History in Diagnostic

Fault Code Action
Display String

316.604.99 Could not register with Registration Refer to “Power Cycle the Printer”
Service. on page 4-57.
316.604.105 SESS data store environmental variable Refer to “Power Cycle the Printer”
not set. on page 4-57.
316.605.07 Unable to Register with Registration Refer to “Internal Communication
Service Error” on page 3-119.
316.605.14 RPC call failure to NC registration service Refer to “Power Cycle the Printer”
on page 4-57.
316.605.26 Fault Service timed out Refer to “Power Cycle the Printer”
on page 4-57.
316.605.35 RPC Call Failure to NC Registration Refer to “Power Cycle the Printer”
Service on page 4-57.
316.605.47 RPC failed to register with NC Refer to “Power Cycle the Printer”
on page 4-57.
316.605.66 RPC Call Failure to NC Registration Refer to “Power Cycle the Printer”
Service on page 4-57.
316.605.67 RPC Call Failure to NC Registration Refer to “Power Cycle the Printer”
Service on page 4-57.
316.605.105 Failed to unregister as RPC service Refer to “Power Cycle the Printer”
during shutdown on page 4-57.
316.606.07 Can not register for events Refer to “Internal Communication
Error” on page 3-119.
316.606.35 Can not register for events Refer to “Power Cycle the Printer”
on page 4-57.
316.606.46 Cannot register for events Refer to “Power Cycle the Printer”
on page 4-57.
316.606.99 Cannot register for events Refer to “Power Cycle the Printer”
on page 4-57.
316.606.105 OS problem Refer to “Power Cycle the Printer”
on page 4-57.
316.607.19 Invalid RPC Data Received Refer to “Power Cycle the Printer”
on page 4-57.
316.607.46 Invalid RPC Data Received Refer to “Power Cycle the Printer”
on page 4-57.
316.607.47 Invalid RPC disk diagnostics Data Refer to “Power Cycle the Printer”
Received on page 4-57.
316.607.92 Invalid RPC Data Received Refer to “Power Cycle the Printer”
on page 4-57.
316.607.105 Service Run loop failed. Refer to “Internal Communication
Error” on page 3-119.
316.608.09 Unable to free IPC resources Refer to “Power Cycle the Printer”
on page 4-57.
316.608.11 IPC un-register failure Refer to “Power Cycle the Printer”
on page 4-57.

A-18 WorkCentre 6400 Service Manual

Reference

Fault Codes (Continued)

Fault Code Action
Display String

316.643.26 Unable to close file Refer to “Power Cycle the Printer”

on page 4-57.
316.643.47 Failed to Close File Refer to “Power Cycle the Printer”
on page 4-57.
316.644.11 Can't read template cache file Refer to “Power Cycle the Printer”
on page 4-57.
316.644.26 Unable to read from file. Refer to “Power Cycle the Printer”
on page 4-57.
316.644.47 SWVerify Get_next_proc failed Refer to “Power Cycle the Printer”
on page 4-57.
316.644.66 File I/O Error Refer to “Power Cycle the Printer”
on page 4-57.
316.644.67 File I/O Error Refer to “Power Cycle the Printer”
on page 4-57.
316.645.11 Can't write updated template cache file Refer to “Power Cycle the Printer”
on page 4-57.
316.645.26 Unable to write to file. Refer to “Power Cycle the Printer”
on page 4-57.
316.645.46 Failed to Write File Refer to “Power Cycle the Printer”
on page 4-57.
316.645.47 Failed to Write File Refer to “Power Cycle the Printer”
on page 4-57.
316.645.66 File I/O Error Refer to “Power Cycle the Printer”
on page 4-57.
316.645.67 File I/O Error Refer to “Power Cycle the Printer”
on page 4-57.
316.646.26 Failed to delete file. Refer to “Power Cycle the Printer”
on page 4-57.
316.647.19 Unable to get Time and Date Refer to “Power Cycle the Printer”
on page 4-57.
316.647.26 Unable to become Client of Diag Service Refer to “Power Cycle the Printer”
on page 4-57.
316.649.35 Invalid service attribute defaults Refer to “Power Cycle the Printer”
on page 4-57.
316.650.35 Invalid service attribute requested Refer to “Power Cycle the Printer”
on page 4-57.
316.650.99 Invalid service attribute requested Refer to “Power Cycle the Printer”
on page 4-57.
316.651.19 Cannot register for SESS Events Refer to “Power Cycle the Printer”
on page 4-57.
316.651.35 Can not register for SESS events Refer to “Power Cycle the Printer”
on page 4-57.
316.651.99 SPI register failed Refer to “Power Cycle the Printer”
on page 4-57.

WorkCentre 6400 Service Manual A-27

Reference

Fault Codes (Continued)

316.670.47 Save NVM Failed Refer to “Power Cycle the Printer”

on page 4-57.
316.670.93 Unable to decode template file Refer to “Power Cycle the Printer”
on page 4-57.
316.671.00 Sort jobs failed Refer to “Power Cycle the Printer”
on page 4-57.
316.671.47 Init NVM failed Refer to “Power Cycle the Printer”
on page 4-57.
316.671.93 Unable to encode template file Refer to “Power Cycle the Printer”
on page 4-57.
316.671.95 Unable to encode template file Refer to “Network Controller
Internal Error” on page 3-121.
316.672.09 Unable to remove file from system Refer to “Power Cycle the Printer”
on page 4-57.
316.672.95 Unable to remove file from system Refer to “Power Cycle the Printer”
on page 4-57.
316.673.95 Cannot remove local directory Refer to “Power Cycle the Printer”
on page 4-57.
316.674.00 XSA RPC Server Death Refer to “Power Cycle the Printer”
on page 4-57.
316.674.09 XSA RPC Server Death Refer to “Power Cycle the Printer”
on page 4-57.
316.675.00 XSA Database Server Death Refer to “Power Cycle the Printer”
on page 4-57.
316.700.00 Unknown Attribute Requested Refer to “Power Cycle the Printer”
on page 4-57.
316.700.35 Unknown attribute requested Refer to “Power Cycle the Printer”
on page 4-57.
316.701.00 Unable to communicate with XSA Refer to “Power Cycle the Printer”
database on page 4-57.
316.701.99 Unable to communicate with XSA Refer to “Power Cycle the Printer”
database on page 4-57.
316.702.00 Unable to communicate with XSA Refer to “Power Cycle the Printer”
database on page 4-57.
316.702.95 Unable to communicate with XSA Refer to “Power Cycle the Printer”
database on page 4-57.
316.707.00 Unknown Queue Request received Refer to “Power Cycle the Printer”
on page 4-57.
316.709.00 Unknown Modify request received Refer to “Power Cycle the Printer”
on page 4-57.
316.710.00 NC Internal Communication Failure Refer to “Power Cycle the Printer”
on page 4-57.
316.710.35 IPC send failure Refer to “Power Cycle the Printer”
on page 4-57.

A-30 WorkCentre 6400 Service Manual

Reference

Fault Codes (Continued)

Fault History in Diagnostic

Fault Code Action
Display String

316.716.00 Data Store init failed Refer to “Power Cycle the Printer”
on page 4-57.
316.728.00 Unable to compute Range String Refer to “Power Cycle the Printer”
on page 4-57.
316.730.00 Unable to create Client Handle Refer to “Power Cycle the Printer”
on page 4-57.
316.730.28 Unable to create Client Handle Refer to “Power Cycle the Printer”
on page 4-57.
316.730.35 Unable to create client handle Refer to “Power Cycle the Printer”
on page 4-57.
316.730.66 Unable to create Client Handle Refer to “Power Cycle the Printer”
on page 4-57.
316.740.19 Error - NC Hard Disk IIO Failure Refer to “Network Controller
Internal Error” on page 3-121.
316.742.19 On Demand Image overwrite failed. Refer to “Network Controller
Internal Error” on page 3-121.
316.750.07 Message Received from DM not Refer to “Internal Communication
Processed correctly Error” on page 3-119.
316.750.09 Cannot Add existing Service Refer to “Power Cycle the Printer”
on page 4-57.
316.750.11 Template cache file is missing Refer to “Power Cycle the Printer”
on page 4-57.
316.750.14 Retry SNMP event registration Refer to “Power Cycle the Printer”
on page 4-57.
316.750.19 Invalid Online/ Offline request Refer to “Power Cycle the Printer”
on page 4-57.
316.750.26 Invalid number of faults requested Refer to “Internal Communication
Error” on page 3-119.
316.750.35 Queue Service library Initialization failed Refer to “Power Cycle the Printer”
on page 4-57.
316.750.38 Error - SPI Init Fault. Refer to “Power Cycle the Printer”
on page 4-57.
316.750.46 Unknown Object (on Read) Refer to “Power Cycle the Printer”
on page 4-57.
316.750.47 SC Diag Startup failed Refer to “Power Cycle the Printer”
on page 4-57.
316.750.66 Failure to set service state Refer to “Power Cycle the Printer”
on page 4-57.
316.750.67 Failure to set service state Refer to “Power Cycle the Printer”
on page 4-57.
316.750.90 Invalid Queue Service IPC Queue ID Refer to “Power Cycle the Printer”
on page 4-57.
316.750.92 Bad file descriptor Refer to “Power Cycle the Printer”
on page 4-57.

WorkCentre 6400 Service Manual A-31

Reference

Fault Codes (Continued)

Fault Code Action
Display String

316.764.09 AppleTalk process death Refer to “Network Controller

Internal Error” on page 3-121.
316.764.14 Internal Logic error Refer to “Power Cycle the Printer”
on page 4-57.
316.764.19 Set Up of the SIGALRM Signal failed Refer to “Power Cycle the Printer”
on page 4-57.
316.764.46 RARP status file error Refer to “Network Controller
Internal Error” on page 3-121.
316.764.47 Incorrect Checksum partition 2 Refer to “Power Cycle the Printer”
on page 4-57.
316.764.67 Create List Failed Refer to “Power Cycle the Printer”
on page 4-57.
316.765.09 Banyan Vines process death Refer to “Network Controller
Internal Error” on page 3-121.
316.765.19 SystemMgr call failed Refer to “Power Cycle the Printer”
on page 4-57.
316.765.46 Failed to clear SM status Refer to “Power Cycle the Printer”
on page 4-57.
316.765.47 Novell Daemon not running Refer to “Network Controller
Internal Error” on page 3-121.
316.765.67 Failed to Retrieve Recipient List Refer to “Power Cycle the Printer”
on page 4-57.
316.765.93 Unable to access data store Refer to “Power Cycle the Printer”
on page 4-57.
316.766.09 Adobe process failure Refer to “Network Controller
Internal Error” on page 3-121.
316.766.19 DM admin error Refer to “Network Controller
Internal Error” on page 3-121.
316.766.46 Failed to set SM status Refer to “Power Cycle the Printer”
on page 4-57.
316.766.47 No Servers Responded Refer to “Power Cycle the Printer”
on page 4-57.
316.766.67 Failed to Bind to LDAP Server Refer to “Power Cycle the Printer”
on page 4-57.
316.766.93 TIFF handle has become null Refer to “Power Cycle the Printer”
on page 4-57.
316.766.95 Cannot create Image file name Refer to “Power Cycle the Printer”
on page 4-57.
316.767.09 HP PCL process death Refer to “Network Controller
Internal Error” on page 3-121.
316.767.19 Request to cancel spooling job error Refer to “Power Cycle the Printer”
on page 4-57.
316.767.46 Failed to send SESS alert/event Refer to “Power Cycle the Printer”
on page 4-57.

WorkCentre 6400 Service Manual A-39

Reference

Fault Codes (Continued)

316.776.95 Cannot clean up after job completion. Refer to “Power Cycle the Printer”
on page 4-57.
316.777.09 NC Completed Job Log Service/SPI Refer to “Power Cycle the Printer”
process death on page 4-57.
316.777.19 Can not access Data Store element Refer to “Power Cycle the Printer”
on page 4-57.
316.777.46 TCPIP invalid addressing. Refer to “Network Controller
Internal Error” on page 3-121.
316.777.95 Cannot log into requested network server Refer to “Power Cycle the Printer”
on page 4-57.
316.778.09 NC Configuration Utility process death Refer to “Power Cycle the Printer”
on page 4-57.
316.778.19 Invalid Enable Demo Job setting Refer to “Power Cycle the Printer”
on page 4-57.
316.778.46 TCPIP socket failure Refer to “Network Controller
Internal Error” on page 3-121.
316.778.95 Cannot generate confirmation sheet. Refer to “Power Cycle the Printer”
on page 4-57.
316.779.00 Power Save Complete callback failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.779.09 NC Diagnostic Service process death Refer to “Power Cycle the Printer”
on page 4-57.
316.779.19 Power Save Complete callback failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.779.46 TCPIP interface attach. Refer to “Network Controller
Internal Error” on page 3-121.
316.779.47 SESS IPX test failed on open for send Refer to “Network Controller
Internal Error” on page 3-121.
316.779.95 Cannot create the template / job log Refer to “Power Cycle the Printer”
name. on page 4-57.
316.780.00 Power Saver request time out Refer to “Power Cycle the Printer”
on page 4-57.
316.780.09 NC Authentication SPI process death Refer to “Power Cycle the Printer”
on page 4-57.
316.780.19 Power Saver request time out Refer to “Power Cycle the Printer”
on page 4-57.
316.780.46 TCPIP enable interface. Refer to “Network Controller
Internal Error” on page 3-121.
316.780.47 SESS IPX test failed on open for receive Refer to “Network Controller
Internal Error” on page 3-121.
316.780.95 Cannot determine the remote directory Refer to “Power Cycle the Printer”
on page 4-57.
316.781.09 NC Counters Utility process death Refer to “Power Cycle the Printer”
on page 4-57.

A-42 WorkCentre 6400 Service Manual

Reference

Fault Codes (Continued)

Fault Code Action
Display String

316.872.47 SESS NETBIOS test name in use. Refer to “Network Controller

Internal Error” on page 3-121.
316.873.47 SESS NETBIOS test name deleted. Refer to “Network Controller
Internal Error” on page 3-121.
316.874.47 SESS NETBIOS test session abended. Refer to “Network Controller
Internal Error” on page 3-121.
316.875.47 SESS NETBIOS test name conflict. Refer to “Network Controller
Internal Error” on page 3-121.
316.876.47 SW verify setup SIGTERM Failed. Refer to “Network Controller
Internal Error” on page 3-121.
316.877.47 SESS PCI test unknown error. Refer to “Network Controller
Internal Error” on page 3-121.
316.878.47 SESS PCI test failed to open driver. Refer to “Network Controller
Internal Error” on page 3-121.
316.879.47 SESS PCI test failed flushing stream Refer to “Network Controller
buffer. Internal Error” on page 3-121.
316.880.47 SESS PCI test failed on put msg call. Refer to “Network Controller
Internal Error” on page 3-121.
316.881.47 SESS PCI test invalid argument. Refer to “Network Controller
Internal Error” on page 3-121.
316.882.47 SESS PCI test failed on put msg call. Refer to “Network Controller
Internal Error” on page 3-121.
316.883.47 SESS PCI test failed on ioctl call. Refer to “Network Controller
Internal Error” on page 3-121.
316.884.47 SESS PCI test control flag area too small. Refer to “Network Controller
Internal Error” on page 3-121.
316.885.47 SESS PCI test driver not initialized. Refer to “Network Controller
Internal Error” on page 3-121.
316.886.47 SESS PCI test info request failed. Refer to “Network Controller
Internal Error” on page 3-121.
316.887.47 SESS PCI test driver failed to register. Refer to “Network Controller
Internal Error” on page 3-121.
316.888.47 SESS PCI test driver failed to unregister. Refer to “Network Controller
Internal Error” on page 3-121.
316.889.47 SW verify get data failed. Refer to “Network Controller
Internal Error” on page 3-121.
316.890.47 SW verify get next proc failed. Refer to “Network Controller
Internal Error” on page 3-121.
316.891.00 Edge server auto registration failed Refer to “Power Cycle the Printer”
on page 4-57.
316.892.00 Edge server communication failed Refer to “Power Cycle the Printer”
on page 4-57.
316.900.19 Failed to open on SMC driver. Refer to “Power Cycle the Printer”
on page 4-57.

WorkCentre 6400 Service Manual A-51

Reference

Fault Codes (Continued)

Fault History in Diagnostic

Fault Code Action
Display String

316.901.19 Failed to make ioctl call using SMC driver. Refer to “Power Cycle the Printer”
on page 4-57.
316.902.19 Address specified is invalid. Refer to “Power Cycle the Printer”
on page 4-57.
316.903.19 Result from ioctl does not match FD. Refer to “Power Cycle the Printer”
on page 4-57.
316.904.19 Invalid ioctl request. Refer to “Power Cycle the Printer”
on page 4-57.
316.905.19 Unknown ioctl failure. Refer to “Power Cycle the Printer”
on page 4-57.
316.906.19 Malloc failed for net upgrade. Refer to “Power Cycle the Printer”
on page 4-57.
316.908.19 Error opening File. Refer to “Power Cycle the Printer”
on page 4-57.
316.909.19 Error transfer data to CCM. Refer to “Internal Communication
Error” on page 3-119.
316.910.19 Failed to untar File. Refer to “Power Cycle the Printer”
on page 4-57.
316.911.19 Error changing directory. Refer to “Power Cycle the Printer”
on page 4-57.
316.912.19 Install script did not execute. Refer to “Power Cycle the Printer”
on page 4-57.
316.913.19 Write failure to File. Refer to “Power Cycle the Printer”
on page 4-57.
316.914.19 Shared memory was corrupted. Refer to “Power Cycle the Printer”
on page 4-57.
316.915.19 Open failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.916.19 CRC Failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.917.19 Failed to close on checksum. Refer to “Power Cycle the Printer”
on page 4-57.
316.918.19 CRC comparison failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.919.19 Restart request failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.920.19 ELT Daemon start failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.922.19 NVM store failed. Refer to “Power Cycle the Printer”
on page 4-57.
316.923.19 Failed saving persistent data. Refer to “Power Cycle the Printer”
on page 4-57.
316.924.19 Failed in restoring persistent data. Refer to “Power Cycle the Printer”
on page 4-57.

A-52 WorkCentre 6400 Service Manual

Reference

Fault Codes (Continued)

Fault Code Action
Display String

377.309.00 Control Panel Door Open Refer to “Lower the Control Panel
Door” on page 3-138.
377.310.00 Finisher Front Door Open Refer to “The Finisher Front Door
is Open” on page 3-139.
377.311.00 Document Feeder Cover Open Refer to “Document Feeder Cover
is Open” on page 3-141.
377.312.00 Right Side Door Open Refer to “The Right Side Door is
Open” on page 3-142.
377.313.00 Communication error with duplex unit, Refer to “Duplex Unit Error” on
may be disconnected or not installed page 3-144.
377.314.00 Communication error with Tray 1 Refer to “Tray 1 Assembly Error”
assembly, may be disconnected or not on page 3-146.
installed
391.313.00 CRUM ASIC Comm Fail Refer to “Xerographic System
Error” on page 3-148.
391.320.00 CC Wire Cut Fail Refer to “Xerographic System
Error” on page 3-150.

WorkCentre 6400 Service Manual A-63

Reference

Status Codes

The following table is a comprehensive list of the status messages that can be
displayed on the control panel. If a status message will not clear and an
associated fault code is not present in fault history use this table to help
determine the appropriate action.
The status code is only visible on the Status tab in CWIS.

Status Codes

Associated
Status Message Status Action
Codes

A Fax Memory error has occurred. 003-549-00 Refer to “A Fax Memory Error
has Occurred” on page 3-125.
A Fax Memory error has occurred. Notify 020-556-00, Refer to “A Fax Memory Error
your System Administrator. 020-558-00, has Occurred” on page 3-125.
020-559-00,
020-570-00,
020-571-00
A Fax Service error has occurred. Call for 003-547-00, Refer to “Fax Services Cannot
assistance. 003-550-00, Register/ Unregister” on
003-551-00 page 3-124.
A metered toner cartridge is installed but 009-652-00, Enter page pack pin or install a
metering is not enabled. 009-653-00, standard toner cartridge.
009-654-00,
009-655-00
A valid Authorization PIN must be entered 002-517-00 Enter Page Pack Pin.
as soon as possible.
Accounting out of memory. Notify your 016-551-00 Accounting log is full. Retrieve
System Administrator. the log.
Additional memory is required to support 016-553-00 Refer to “Power Cycle the
Scan to File. Notify your System Printer” on page 4-57.
Administrator
All incomplete jobs have been deleted. 019-514-00, Resubmit job.
022-503-04
Auto calibration failed. You may manually 009-664-00 Manually calibrate image
run Image Quality Calibration in Tools. quality.
Auto configuration is disabled. 022-504-16, Refer to “Power Cycle the
022-506-17 Printer” on page 4-57.
Auto Paper Select is not available. 022-512-04 Enable auto selection for at least
one tray.
Autonet functions are not available. Notify 016-508-00 Refer to “Power Cycle the
your System Administrator. Printer” on page 4-57.
Black Toner cartridge is missing or not 009-637-00, Refer to “Cyan, Magenta,
seated properly. 009-675-00 Yellow, or Black Toner Cartridge
is Missing or not Seated
Properly” on page 3-152.
Check the settings for Tray 1. 001-540-01 Verify tray settings.
Check the settings for Tray 2. 001-540-02 Verify tray settings.

A-64 WorkCentre 6400 Service Manual

Reference

Status Codes (Continued)

Associated
Status Message Status Action
Codes

Associated
Status Message Status Action
Codes

Please wait... Freeing memory. 019-502-00 No action required.

Please wait... Adjustments are in progress. 009-584-00 No action required.
Please Wait... Disk encryption operation in 017-580-00 No action required.
progress.
Please wait... One or more options are 022-553-00 No action required.
being installed.
Please wait... One or more options are 022-554-00 No action required.
being removed.
Please wait... The Fax Service is initializing. 020-544-00 No action required.
Please wait... The image disk is full. 019-513-00 No action required.
Please wait... The Scanner is attempting to 003-557-00 No action required.
recover.
Please wait... The system is attempting to 003-561-00, No action required.
recover. 003-561-00,
022-501-04
Power on failed. 002-590-00, Refer to “AC Power Supply
022-557-00 Troubleshooting” on page 4-58.
Prohibited Original has been detected. 015-571-00 Anti-counterfeit system
detected prohibited original.
Provide payment or the current job may be 003-559-00, Follow the on-screen
deleted. 003-559-04, instructions.
003-559-05,
003-559-06
Provide payment. 003-559-01, Follow the on-screen
003-559-03 instructions.
Remove documents from the Document 022-505-02 Follow the on-screen
Feeder Input Tray or close the Document instructions.
Feeder.
Reorder Black (K) Imaging Unit but DO NOT 009-611-00 No action required.
replace until prompted.
Reorder Black Toner (K) but DO NOT 009-605-00 No action required.
replace until prompted.
Reorder Cyan (C) Imaging Unit but DO NOT 009-608-00 No action required.
replace until prompted.
Reorder Cyan Toner (C) but DO NOT 009-602-00 No action required.
replace until prompted.
Reorder Fuser but DO NOT replace until 009-622-00, No action required.
prompted. 010-524-00
Reorder Magenta (M) Imaging Unit but DO 009-609-00 No action required.
NOT replace until prompted.
Reorder Magenta Toner (M) but DO NOT 009-603-00 No action required.
replace until prompted.
Reorder Transfer Belt but DO NOT replace 009-607-00 No action required.
until prompted.

A-70 WorkCentre 6400 Service Manual

Reference

Status Codes (Continued)

Associated
Status Message Status Action
Codes

Associated
Status Message Status Action
Codes

The Network Controller connection is about 016-502-00, No action required.

The Fax NVM table contains NVM value information that can be used to
adjust the Fax NVM value for the printer.

Fax NVM Value

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Line 1 configuration setting 0 = Send and Receive FaxLine1Config 200 1 0 0 2

1 = Send only
2 = Receive only

Line 2 configuration setting 0 = Send and Receive FaxLine2Config 200 2 0 0 2

1 = Send only
2 = Receive only

Priority of fax lines 1 = line 1 has priority LinePriority 200 9 1 1 2

2 = line 2 has priority

Number of times to redial (connected) 0~5 200 10 0 0 0

Sends a cover sheet and extra pages if 0 = without cover page and resend failed FaxAutoResendDefault 200 11 3 0 5
interrupted pages
1 = with cover page and resend failed page
2 = without cover page and resend all pages
3 = with Cover page and resend all pages

Listens to line traffic on sending 0 = Disabled 200 13 1 0 1

1 = Enabled

Enables audio line monitor and determines 0 = Disabled FaxAudioLineMonEnbld 200 14 0 0 1

when audio line monitoring stops 1 = Speaker on until carrier signal detected
2 = Speaker always on when modem is off-
hook
3 = Speaker on until carrier is detected,
except while dialing

Determines when to stop listening to the line 0 - 25 seconds FaxAudioLineMonEnbld 200 14 0 0 3

traffic

Volume of the line monitor 0 = High FaxAudioLineMonDel 200 15 5 0 25

1 = Medium
2 = Low

Receive mailbox policy 0 = Delete on Print FaxAudioLineMonVol 200 16 1 0 2

1 = Keep For 1 -72 hours
2 = Keep Forever

Time to keep if the policy is a pre set time 1 ~ 72 hours FaxreceivemboxDocDef 200 17 0 0 2

Answer mode 0 = Auto FxreceivemboxDocTime 200 18 72 1 72

1 = Manual

Determines what to declare for paper sizes 0 = Auto FaxAnswerMode 200 19 0 0 1

1 = Manual

Determines what size of image to send 0 = Reduce to Fit FaxRecvPprAutoEnbld 200 20 0 0 1

1 = Split pages

Determines if removing scan lines is 0 = Disabled FaxSendOptions 200 21 0 0 1

allowable 1 = Enabled (5")

Determines if a reduced image is shown 0 = Reduced Image FaxRecvPageMargin 200 22 1 0 1

1 = No Image

Determines when a transmission report is 0 = Always Print TransmnReportApp 200 23 0 0 1

printed 1 = Print on Error
2 = Off

Ring volume 0 = High TransRptBehaviour 200 24 1 0 2

1 = Medium
2 = Low

A-78 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Ring volume enabled 0 = Disabled FaxRingVolume 200 25 1 0 2

1 = Enabled

Date Format 0 = MM/DD/YY 200 28 0 0 1

1 = DD/MM/YY
2 = Unused (DO NOT USE)
3 = YY/MM/DD

Time format 0 = 12 hour FaxDateFieldFormat 200 29 0 0 3

1 = 24 hour

Transmit header Text enabled 0 = Disabled FaxTimeFieldFormat 200 30 1 0 1

1 = Enabled

Enable junk fax prevention 0 = Disabled 200 32 N/A N/A N/A

T30 Maximum Speed Line 2 RX 33600=3, 31200=4, 28800=5, 26400=6, 200 72 0 0 0

24000=7, 21600=8, 19200=9, 16800=10,
14400=11, 12000=12, 9600=13, 7200=14,
4800=15, 2400=16

T30 Preferred Resolution Units Line 1 TX 0=Any, Metric=1, Inch=2 200 73 0 0 0

T30 Preferred Resolution Units Line 1 TX Metric=1, Inch=2 200 74 0 0 5

T30 Preferred Resolution Units Line 2 TX 0=Any, Metric=1, Inch=2 200 75 0 0 6

T30 Preferred Resolution Units Line 2 TX Metric=1, Inch=2 200 76 0 0 0

T30 Preferred Resolution Units Line 1 RX 0=Any, Metric=1, Inch=2 Line1CurrentDetect 200 77 1 0 1

T30 Preferred Resolution Units Line 2 RX 0=Any, Metric=1, Inch=2 Line2CurrentDetect 200 78 1 0 1

T30 Minimum Scan Line Time Line 1 0ms/0ms=0, 5ms/5ms=1, 10ms/5ms=2, CompressTypeLine1TX 200 79 5 2 5
10ms/10ms=3, 20ms/10ms=4, 20ms/
20ms=5, 40ms,20ms=6, 40ms/40ms=7

T30 Minimum Scan Line Time Line 2 0ms/0ms=0, 5ms/5ms=1, 10ms/5ms=2, CompressTypeLine2TX 200 80 5 2 5
10ms/10ms=3, 20ms/10ms=4, 20ms/
20ms=5, 40ms,20ms=6, 40ms/40ms=7

T30 ECM Enabled/Disabled Line 1 Tx 0=disabled CompressTypeLine1RX 200 81 5 2 5

1=enabled

T30 ECM Enabled/Disabled Line 2 Tx 0=disabled CompressTypeLine2RX 200 82 5 2 5

1=enabled

T30 ECM Enabled/Disabled Line 1 Rx 0=disabled T30MaxResL1Tx 200 83 8 2 8

1=enabled

WorkCentre 6400 Service Manual A-81

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

T30 ECM Enabled/Disabled Line 2 Rx 0=disabled T30MaxResL2Tx 200 84 8 2 8

1=enabled

Look ahead period to pending fax job which Minutes T30MaxSpeedL1Tx 200 87 3 3 16
will prohibit entry into Sleep.

Determines if a confirmed transmission 0 = Strict retry policy (all MCF required) T30MaxSpeedL2Tx 200 88 3 3 16
report is printed if MCF not received for last 1 = Optional ignore final missing MCF
page sent.

Allows Fax Protocol Report to be printed in 0 = Off T30MaxSpeedL1Rx 200 89 3 3 16

the event of a communications error 1 = Auto Print On Error
2=Always Print Report

The ability to Enable always negotiating 0 = Disabled T30PrefResUnitsL2Tx 200 92 1 1 2

unlimited length (DCS) on line 1 1 = Enabled

The ability to Enable always negotiating 0 = Disabled T30PrefResUnitsL1Rx 200 93 0 0 2

unlimited length (DCS) on line 2 1 = Enabled

The ability to enable increased compatibility 0 = Disabled T30PrefResUnitsL2Rx 200 94 0 0 2

at the expense of more advanced fax features. 1 = Enabled

Busy Tone detection during dial tone 0 = disable PwrSavEntryLookAhead 200 103 1 0 120
detection 1 = enable

Part of pair with ID 1602 for Classic Fax Reserved ExtendedRetryPolicy 200 104 0 0 1

Allow the ability to send to the same 0 = Disabled (Only 1 fax send to a given ProtReportOnError 200 105 0 0 2
destination number on both fax lines number at a time even if there is another line
simultaneously. (*33 enabled/disabled via free)
GUI) 1 = Enabled (Can have more than 1 fax send
to a given number at the same time)

Allows the ability to set a short time period 0 = Disabled 200 106 0 0 2
which a failed job waits before redialing 1 = Enabled

Set the duration of the ShortResendTimer in 1 ~ 255 FaxIioStatus 200 107 0 0 1

seconds

The ability to Enable or Disable Legal/Letter 0 = Disabled UNLIMITEDLENGTHLINE2 200 111 1 0 1

stock (DCS) 1 = Enabled

The ability to Enable or Disable Legal/Letter 0 = Disabled AdvancedCapabilities 200 112 1 0 1

stock (DIS) 1 = Enabled

Dial type configuration 0 = Tone 200 114 8 2 8

1 = Pulse

Dial type configuration 0 = Tone 200 115 8 2 8

1 = Pulse

When to answer the call if automatic. 0 - 15 seconds 200 116 5 2 5

Number of times to retry (not connected) 0 ~ 14 200 117 5 2 5

Time between each redial 1 ~ 25 minutes 200 118 3 3 16

Busy 1 Filter stage 1 A1 0x02CA 200 119 3 3 16

Busy 1 Filter stage 1 A2 0xFD36 200 120 0 0 1

Busy 1 Filter stage 1 A3 0x0000 DetBusyToneDurDTone 200 121 0 0 1

Busy 1 Filter stage 1 B1 0x7243 DetBusyToneDurDTone 200 121 0 0 0

Busy 1 Filter stage 1 B2 0xC63E ParallelTxToSameDest 200 122 0 0 1

Busy 1 Filter stage 2 A1 0x02CA ShortResendPolicy 200 123 0 0 1

Busy 1 Filter stage 2 A2 0x0593 ShortResendTimer 200 124 30 1 255

Busy 1 Filter stage 2 A3 0x02CA 200 125 0 0 1

Busy 1 Filter stage 2 B1 0x7243 200 126 0 0 1

Busy 1 Filter stage 2 B2 0xC63E 200 127 1 0 1

Busy 1 Low Pass Feedback 0x7E67 200 128 0 0 0

Busy 1 Low Pass Gain 0x02DF 200 129 0 0 0

A-82 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Busy 1 Upper Threshold 0x2A00 200 130 0 0 0

Busy 1 Lower Threshold 0x1C00 200 131 0 0 0

Call progress detection threshold (-dB) 0 ~ 255 (-dB) 200 132 0 0 0

Busy 2 Filter stage 1 A1 0x02CA 200 133 0 0 0

Busy 2 Filter stage 1 A2 0xFD36 200 134 0 0 0

Busy 2 Filter stage 1 A3 0x0000 200 135 0 0 0

Busy 2 Filter stage 1 B1 0x7243 200 136 0 0 0

Busy 2 Filter stage 1 B2 0xC63E 200 137 0 0 0

Busy 2 Filter stage 2 A1 0x02CA 200 138 0 0 0

Busy 2 Filter stage 2 A2 0x0593 200 139 0 0 0

Busy 2 Filter stage 2 A3 0x02CA USSTOCKSUPPORTTX 200 140 0 0 1

Busy 2 Filter stage 2 B1 0x7243 USSTOCKSUPPORTRX 200 141 1 0 1

Busy 2 Filter stage 2 B2 0xC63E 200 142 0 0 0

Busy 2 Low Pass Feedback 0x7E67 200 143 0 0 1

Busy 2 Low Pass Gain 0x02DF FaxLine1DialTypeDef 200 201 0 0 1

Busy 2 Upper Threshold 0x2A00 FaxLine2DialTypeDef 200 202 0 0 1

Busy 2 Lower Threshold 0x1C00 FaxAutoAnswerDelay 200 203 0 0 15

Busy 1 detection algorithm FaxAutoRedialDefault 200 204 0 0 14

Busy 1 number cell pattern Number of patterns to describe the FaxAutoRedialTimeDef 200 205 15 1 25
sequence

Number of busy cycles required to detect 0 ~ 255 Busy1FilterStage1A1 200 206 0x02CA 0 0xFFFF
busy condition

Busy 1 timeout reset detector milliseconds Busy1FilterStage1A2 200 207 0xFD36 0 0xFFFF

Busy 1 make min 1 milliseconds Busy1FilterStage1A3 200 208 0x0000 0 0xFFFF

Min busy cadence on time (x 10ms) 0 - 255 (x10 ms) Busy1FilterStage1B1 200 209 0x7243 0 0xFFFF
0 = standard detection algorithm;
1 - 255 = country specific cadence values

Busy 1 make max 1 milliseconds Busy1FilterStage1B2 200 210 0xC63E 0 0xFFFF

Max busy cadence on time (x 10ms) 0 - 255 (x10 ms) Busy1FilterStage2A1 200 211 0x02CA 0 0xFFFF
0 = standard detection algorithm;
1 ~ 255 = country specific cadence values

Busy 1 make hole 1 milliseconds Busy1FilterStage2A2 200 212 0x0593 0 0xFFFF

Busy 1 break min 1 milliseconds Busy1FilterStage2A3 200 213 0x02CA 0 0xFFFF

Min busy cadence off time (x 10ms) 0 ~ 255 (x10 ms) Busy1FilterStage2B1 200 214 0x7243 0 0xFFFF
0 = standard detection algorithm;
1 ~ 255 = country specific cadence values

Busy 1 break max 1 milliseconds Busy1FilterStage2B2 200 215 0xC63E 0 0xFFFF

Max busy cadence off time (x 10ms) 0 ~ 255 (x10 ms) Busy1LowPassFeedback 200 216 0x7E67 1 0xFFFF
0 = standard detection algorithm;
1 ~ 255 = country specific cadence values

Busy 1 break hole 1 milliseconds FaxBusy1LowPassGain 200 217 0x02DF 1 0xFFFF

Busy 1 idx next cell 1 Index of next pattern Busy1UpperThreshold 200 218 0x2A00 1 0xFFFF

Busy 1 idx restart cell 1 Index to restart at Busy1LowerThreshold 200 219 0x1C00 1 0xFFFF

Busy 1 flag detection performed 1 Is this the last detection pattern? Busy1LowerThreshold 200 219 0x2B 0 0xFF

Busy 1 make min 2 milliseconds Busy2FilterStage1A1 200 220 0x02CA 0 0xFFFF

Busy 1 make max 2 milliseconds Busy2FilterStage1A2 200 221 0xFD36 0 0xFFFF

WorkCentre 6400 Service Manual A-83

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Busy 1 make hole 2 milliseconds Busy2FilterStage1A3 200 222 0x0000 0 0xFFFF

Busy 1 break min 2 milliseconds Busy2FilterStage1B1 200 223 0x7243 0 0xFFFF

Busy 1 break max 2 milliseconds Busy2FilterStage1B2 200 224 0xC63E 0 0xFFFF

Busy 1 break hole 2 milliseconds Busy2FilterStage2A1 200 225 0x02CA 0 0xFFFF

Busy 1 idx next cell 2 Index of next pattern Busy2FilterStage2A2 200 226 0x0593 0 0xFFFF

Busy 1 idx restart cell 2 Index to restart at FaxBsy2FilterStge2A3 200 227 0x02CA 0 0xFFFF

Busy 1 flag detection performed 2 Is this the last detection pattern? FaxBsy2FilterStge2B1 200 228 0x7243 0 0xFFFF

Busy 1 make min 3 milliseconds Busy2FilterStage2B2 200 229 0xC63E 0 0xFFFF

Busy 1 make max 3 milliseconds Busy2LowPassFeedback 200 230 0x7E67 1 0xFFFF

Busy 1 make hole 3 milliseconds FaxBusy2LowPassGain 200 231 0x02DF 1 0xFFFF

Busy 1 break min 3 milliseconds Busy2UpperThreshold 200 232 0x2A00 1 0xFFFF

Busy 1 break max 3 milliseconds Busy2LowerThreshold 200 233 0x1C00 1 0xFFFF

Busy 1 break hole 3 milliseconds Busy1DetectAlgorithm 200 234 0x20 0x20 0x21

Busy 1 idx next cell 3 Index of next pattern Busy1NumCellPattern 200 235 1 0 3

Busy 1 idx restart cell 3 Index to restart at Busy1NumCellPattern 200 235 2 0 0xFF

Busy 1 flag detection performed 3 Is this the last detection pattern? Busy1TmoutResetDetct 200 236 100 1 15000

Busy 2 detection algorithm FaxBusy1MakeMin1 200 237 450 0 10000

Busy 2 number cell pattern Number of patterns to describe the FaxBusy1MakeMin1 200 237 0 0 0xFF
sequence

Busy 2 timeout reset detector milliseconds FaxBusy1MakeMax1 200 238 550 0 10000

Busy 2 make min 1 milliseconds FaxBusy1MakeMax1 200 238 0 0 0xFF

Busy 2 make max 1 milliseconds FaxBusy1MakeHole1 200 239 40 0 10000

Busy 2 make hole 1 milliseconds FaxBusy1BreakMin1 200 240 450 0 10000

Busy 2 break min 1 milliseconds FaxBusy1BreakMin1 200 240 0 0 0xFF

Busy 2 break max 1 milliseconds FaxBusy1BreakMax1 200 241 550 0 10000

Busy 2 break hole 1 milliseconds FaxBusy1BreakMax1 200 241 0 0 0xFF

Busy 2 idx next cell 1 Index of next pattern FaxBusy1BreakHole1 200 242 0 0 10000

Busy 2 idx restart cell 1 Index to restart at FaxBusy1IdxNextCell1 200 243 0 0 2

Busy 2 flag detection performed 1 Is this the last detection pattern? Busy1IdxRestartCell1 200 244 0 0 2

Busy 2 make min 2 milliseconds Busy1FlagDetctPerfd1 200 245 1 0 1

Busy 2 make max 2 milliseconds FaxBusy1MakeMin2 200 246 0 0 10000

Busy 2 make hole 2 milliseconds FaxBusy1MakeMax2 200 247 0 0 10000

Busy 2 break min 2 milliseconds FaxBusy1MakeHole2 200 248 0 0 10000

Busy 2 break max 2 milliseconds FaxBusy1BreakMin2 200 249 0 0 10000

Busy 2 break hole 2 milliseconds FaxBusy1BreakMax2 200 250 0 0 10000

Busy 2 idx next cell 2 Index of next pattern FaxBusy1BreakHole2 200 251 0 0 10000

Busy 2 idx restart cell 2 Index to restart at FaxBusy1IdxNextCell2 200 252 0 0 2

Busy 2 flag detection performed 2 Is this the last detection pattern? Busy1IdxRestartCell2 200 253 0 0 2

Busy 2 make min 3 milliseconds Busy1FlgDetectPerfd2 200 254 0 0 1

Busy 2 make max 3 milliseconds FaxBusy1MakeMin3 200 255 0 0 10000

Busy 2 make hole 3 milliseconds FaxBusy1MakeMax3 200 256 0 0 10000

Busy 2 break min 3 milliseconds FaxBusy1MakeHole3 200 257 0 0 10000

A-84 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Busy 2 break max 3 milliseconds FaxBusy1BreakMin3 200 258 0 0 10000

Busy 2 break hole 3 milliseconds FaxBusy1BreakMax3 200 259 0 0 10000

Busy 2 idx next cell 3 Index of next pattern FaxBusy1BreakHole3 200 260 0 0 10000

Busy 2 idx restart cell 3 Index to restart at FaxBusy1IdxNextCell3 200 261 0 0 2

Busy 2 flag detection performed 3 Is this the last detection pattern? Busy1IdxRestartCell3 200 262 0 0 2

Congest 1 Filter stage 1 A1 0x02CA Busy1FlagDetctPerfd3 200 263 0 0 1

Congest 1 Filter stage 1 A2 0xFD36 Busy2DetectAlgorithm 200 264 0x20 0x20 0x21

Congest 1 Filter stage 1 A3 0x0000 Busy2NumCellPattern 200 265 1 0 3

Congest 1 Filter stage 1 B1 0x7243 Busy2TmoutResetDetct 200 266 100 1 15000

Congest 1 Filter stage 1 B2 0xC63E FaxBusy2MakeMin1 200 267 600 0 10000

Congest 1 Filter stage 2 A1 0x02CA FaxBusy2MakeMax1 200 268 3700 0 10000

Congest 1 Filter stage 2 A2 0x0593 FaxBusy2MakeHole1 200 269 130 0 10000

Congest 1 Filter stage 2 A3 0x02CA FaxBusy2BreakMin1 200 270 550 0 10000

Congest 1 Filter stage 2 B1 0x7243 FaxBusy2BreakMax1 200 271 550 0 10000

Congest 1 Filter stage 2 B2 0xC63E FaxBusy2BreakHole1 200 272 0 0 10000

Congest 1 Low Pass Feedback 0x7E67 FaxBusy2IdxNextCell1 200 273 0 0 2

Congest 1 Low Pass Gain 0x02DF Busy2IdxRestartCell1 200 274 0 0 2

Congest 1 Upper Threshold 0x2A00 Busy2FlagDetctPerfd1 200 275 1 0 1

Congest 1 Lower Threshold 0x1C00 FaxBusy2MakeMin2 200 276 0 0 10000

Congest 1 detection algorithm FaxBusy2MakeMax2 200 277 0 0 10000

Congest 1 number cell pattern Number of patterns to describe the FaxBusy2MakeHole2 200 278 0 0 10000
sequence

Congest 1 timeout reset detector milliseconds FaxBusy2BreakMin2 200 279 0 0 10000

Congest 1 make min 1 milliseconds FaxBusy2BreakMax2 200 280 0 0 10000

Congest 1 make max 1 milliseconds FaxBusy2BreakHole2 200 281 0 0 10000

Congest 1 make hole 1 milliseconds FaxBusy2IdxNextCell2 200 282 0 0 2

Congest 1 break min 1 milliseconds Busy2IdxRestartCell2 200 283 0 0 2

Congest 1 break max 1 milliseconds Busy2FlagDetctPerfd2 200 284 0 0 1

Congest 1 break hole 1 milliseconds FaxBusy2MakeMin3 200 285 0 0 10000

Congest 1 idx next cell 1 Index of next pattern FaxBusy2MakeMax3 200 286 0 0 10000

Congest 1 idx restart cell 1 Index to restart at FaxBusy2MakeHole3 200 287 0 0 10000

Congest 1 flag detection performed 1 Is this the last detection pattern? FaxBusy2BreakMin3 200 288 0 0 10000

Congest 1 make min 2 milliseconds FaxBusy2BreakMax3 200 289 0 0 10000

Congest 1 make max 2 milliseconds FaxBusy2BreakHole3 200 290 0 0 10000

Congest 1 make hole 2 milliseconds FaxBusy2IdxNextCell3 200 291 0 0 2

Congest 1 break min 2 milliseconds Busy2IdxRestartCell3 200 292 0 0 2

Congest 1 break max 2 milliseconds Busy2FlagDetctPerfd3 200 293 0 0 1

Congest 1 break hole 2 milliseconds Congt1FilterStage1A1 200 294 0x02CA 0 0xFFFF

Congest 1 idx next cell 2 Index of next pattern Congt1FilterStage1A2 200 295 0xFD36 0 0xFFFF

Congest 1 idx restart cell 2 Index to restart at Congt1FilterStage1A3 200 296 0x0000 0 0xFFFF

Congest 1 flag detection performed 2 Is this the last detection pattern? Congt1FilterStage1B1 200 297 0x7243 0 0xFFFF

Congest 1 make min 3 milliseconds Congt1FilterStage1B2 200 298 0xC63E 0 0xFFFF

WorkCentre 6400 Service Manual A-85

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Congest 1 make max 3 milliseconds Congt1FilterStage2A1 200 299 0x02CA 0 0xFFFF

Congest 1 make hole 3 milliseconds Congt1FilterStage2A2 200 300 0x0593 0 0xFFFF

Congest 1 break min 3 milliseconds Congt1FilterStage2A3 200 301 0x02CA 0 0xFFFF

Congest 1 break max 3 milliseconds Congt1FilterStage2B1 200 302 0x7243 0 0xFFFF

Congest 1 break hole 3 milliseconds Congt1FilterStage2B2 200 303 0xC63E 0 0xFFFF

Congest 1 idx next cell 3 Index of next pattern Congt1LwPassFeedback 200 304 0x7E67 1 0xFFFF

Congest 1 idx restart cell 3 Index to restart at Congest1LowPassGain 200 305 0x02DF 1 0xFFFF

Congest 1 flag detection performed 3 Is this the last detection pattern? Congt1UpperThreshold 200 306 0x2A00 1 0xFFFF

CED 1 Filter stage 1 A1 0x02CA Congt1LowerThreshold 200 307 0x1C00 1 0xFFFF

CED 1 Filter stage 1 A2 0xFD36 Congt1DetctAlgorithm 200 308 0x20 0x20 0x21

CED 1 Filter stage 1 A3 0x0000 Congt1NumCellPattern 200 309 1 0 3

CED 1 Filter stage 1 B1 0x7243 Congt1TmoutRsetDetct 200 310 100 1 15000

CED 1 Filter stage 1 B2 0xC63E FaxCongest1MakeMin1 200 311 450 0 10000

CED 1 Filter stage 2 A1 0x02CA FaxCongest1MakeMax1 200 312 550 0 10000

CED 1 Filter stage 2 A2 0x0593 FaxCongest1MakeHole1 200 313 40 0 10000

CED 1 Filter stage 2 A3 0x02CA FaxCongest1BreakMin1 200 314 450 0 10000

CED 1 Filter stage 2 B1 0x7243 FaxCongest1BreakMax1 200 315 550 0 10000

CED 1 Filter stage 2 B2 0xC63E FaxCongst1BreakHole1 200 316 0 0 10000

CED 1 Low Pass Feedback 0x7E67 Congest1IdxNextCell1 200 317 0 0 2

CED 1 Low Pass Gain 0x02DF Congt1IdxRstartCell1 200 318 0 0 2

CED 1 Upper Threshold 0x2A00 Congt1FlgDetctPerfd1 200 319 1 0 1

CED 1 Lower Threshold 0x1C00 FaxCongest1MakeMin2 200 320 0 0 10000

FAX/ data answer tone detection threshold 0 - 255 (-dB) FaxCongest1MakeMax2 200 321 0 0 10000
(-dB)

CED 1 detection algorithm FaxCongest1MakeHole2 200 322 0 0 10000

CED 1 number cell pattern Number of patterns to describe the FaxCongest1BreakMin2 200 323 0 0 10000
sequence

CED 1 timeout reset detector milliseconds FaxCongest1BreakMax2 200 324 0 0 10000

Answer tone validation time (x 10ms) 0 - 255 (x10 ms) FaxCongst1BreakHole2 200 325 0 0 10000

CED 1 make min 1 milliseconds Congest1IdxNextCell2 200 326 0 0 2

CED 1 make max 1 milliseconds Congt1IdxRstartCell2 200 327 0 0 2

CED 1 make hole 1 milliseconds Congt1FlgDetctPerfd2 200 328 0 0 1

CED 1 break min 1 milliseconds FaxCongest1MakeMin3 200 329 0 0 10000

CED 1 break max 1 milliseconds FaxCongest1MakeMax3 200 330 0 0 10000

CED 1 break hole 1 milliseconds FaxCongest1MakeHole3 200 331 0 0 10000

CED 1 idx next cell 1 Index of next pattern FaxCongest1BreakMin3 200 332 0 0 10000

CED 1 idx restart cell 1 Index to restart at FaxCongest1BreakMax3 200 333 0 0 10000

CED 1 flag detection performed 1 Is this the last detection pattern? FaxCongst1BreakHole3 200 334 0 0 10000

CED 1 make min 2 milliseconds Congest1IdxNextCell3 200 335 0 0 2

CED 1 make max 2 milliseconds Congt1IdxRstartCell3 200 336 0 0 2

CED 1 make hole 2 milliseconds Congt1FlgDetctPerfd3 200 337 0 0 1

CED 1 break min 2 milliseconds FaxCED1FiltrStage1A1 200 338 0x02CA 1 0xFFFF

CED 1 break max 2 milliseconds FaxCED1FiltrStage1A2 200 339 0xFD36 1 0xFFFF

A-86 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

CED 1 break hole 2 milliseconds FaxCED1FiltrStage1A3 200 340 0x0000 0 0xFFFF

CED 1 idx next cell 2 Index of next pattern FaxCED1FiltrStage1B1 200 341 0x7243 1 0xFFFF

CED 1 idx restart cell 2 Index to restart at FaxCED1FiltrStage1B2 200 342 0xC63E 1 0xFFFF

CED 1 flag detection performed 2 Is this the last detection pattern? FaxCED1FiltrStage2A1 200 343 0x02CA 1 0xFFFF

CED 1 make min 3 milliseconds FaxCED1FiltrStage2A2 200 344 0x0593 1 0xFFFF

CED 1 make max 3 milliseconds FaxCED1FiltrStage2A3 200 345 0x02CA 1 0xFFFF

CED 1 make hole 3 milliseconds FaxCED1FiltrStage2B1 200 346 0x7243 1 0xFFFF

CED 1 break min 3 milliseconds FaxCED1FiltrStage2B2 200 347 0xC63E 1 0xFFFF

CED 1 break max 3 milliseconds FaxCED1LwPassFeedbck 200 348 0x7E67 1 0xFFFF

CED 1 break hole 3 milliseconds FaxCED1LowPassGain 200 349 0x02DF 1 0xFFFF

CED 1 idx next cell 3 Index of next pattern FaxCED1UpprThreshold 200 350 0x2A00 1 0xFFFF

CED 1 idx restart cell 3 Index to restart at FaxCED1LowrThreshold 200 351 0x1C00 1 0xFFFF

CED 1 flag detection performed 3 Is this the last detection pattern? FaxCED1LowrThreshold 200 351 0x2B 0 0xFF

International Dtone 1 Filter stage 1 A1 0x02CA CED1DetectAlgorithm 200 352 0x20 0x20 0x21

International Dtone 1 Filter stage 1 A2 0xFD36 CED1NumCellPattern 200 353 1 0 3

International Dtone 1 Filter stage 1 A3 0x0000 CED1TmoutResetDetect 200 354 100 1 15000

International Dtone 1 Filter stage 1 B1 0x7243 CED1TmoutResetDetect 200 354 0x0A 0 0xFF

International Dtone 1 Filter stage 1 B2 0xC63E FaxCED1MakeMin1 200 355 600 0 10000

International Dtone 1 Filter stage 2 A1 0x02CA FaxCED1MakeMax1 200 356 600 0 10000

International Dtone 1 Filter stage 2 A2 0x0593 FaxCED1MakeHole1 200 357 30 0 10000

International Dtone 1 Filter stage 2 A3 0x02CA FaxCED1BreakMin1 200 358 0 0 10000

International Dtone 1 Filter stage 2 B1 0x7243 FaxCED1BreakMax1 200 359 0 0 10000

International Dtone 1 Filter stage 2 B2 0xC63E FaxCED1BreakHole1 200 360 0 0 10000

International Dtone 1 Low Pass Feedback 0x7E67 FaxCED1IdxNextCell1 200 361 0 0 0xff

International Dtone 1 Low Pass Gain 0x02DF CED1IdxRestartCell1 200 362 0 0 2

International Dtone 1 Upper Threshold 0x2A00 CED1FlagDetectPerfd1 200 363 1 0 1

International Dtone 1 Lower Threshold 0x1C00 FaxCED1MakeMin2 200 364 0 0 10000

Select tones to detect before dialling 0 = blind dial FaxCED1MakeMax2 200 365 0 0 10000
1 = detect dial tone.

Dial tone detection before dialling 0 = detect dial tone FaxCED1MakeHole2 200 366 0 0 10000
1 = blind dial
2 = blind dial with speaker on

Determines pause time before dial (blind 0 ~ 255 1=100ms FaxCED1BreakMin2 200 367 0 0 10000
mode) or dial tone detection timeout.

Determines pause time before dialing (blind 0 ~ 65 seconds FaxCED1BreakMax2 200 368 0 0 10000
dial mode)

Make time for pulse dialling 0 ~ 255 1=1mS step FaxCED1BreakHole2 200 369 0 0 10000

Make time for pulse dialling 0 ~ 255 1=1mS step FaxCED1IdxNextCell2 200 370 0 0 2

Break time for pulse dialling 0 ~ 255 1=1mS step CED1IdxRestartCell2 200 371 0 0 2

Break time for pulse dialling 0 ~ 255 1=1mS step CED1FlagDetectPerfd2 200 372 0 0 1

Interdigit pause for pulse dialling 0 ~ 255 1 = 10mS step FaxCED1MakeMin3 200 373 0 0 10000

Select tones to detect after dialling 0 = No Detect (ANSAM/CED Only) FaxCED1MakeMax3 200 374 0 0 10000
1 = Detect BUSY/CED/ANSAM
2 = Detect Cong/CED/ANSAM
3 = Detect BUSY/Cong/CED/ANSAM

WorkCentre 6400 Service Manual A-87

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Select tones to detect after dialling (Busy 0 = No Detect (ANSAM/CED Only) FaxCED1MakeHole3 200 375 0 0 10000
tone) 1 = Detect BUSY/CED/ANSAM

CED detect time from end of dial to call 0 ~ 255 1 = 1S step FaxCED1BreakMin3 200 376 0 0 10000
cleardown.

CED detect time from end of dial to call 0 ~ 255 1 = 1S step FaxCED1BreakMax3 200 377 0 0 10000
cleardown.

Abandons call and does not redial if T0 0 = disabled FaxCED1BreakHole3 200 378 0 0 10000
timeout occurs (no ANSAM/CED detection) 1 = enabled

Fax modem Tx level for line1 and 2 0 ~ -15 dBm in -1 dB steps FaxCED1IdxNextCell3 200 379 0 0 2
0 = 0dBm, 15=-15dBm

Fax modem Tx level for line1 and 2 0 ~ -20 dBm in -1 dB steps CED1IdxRestartCell3 200 380 0 0 2
0 = 0dBm, 20=-20dBm

Selects type of billing filter 0 = none CED1FlagDetectPerfd3 200 381 0 0 1

1 = 12Khz
2 = 16KHz

Selects type of billing filter 0 = none IntDtone1FltrStge1A1 200 382 0x02CA 1 0xFFFF
1 = 12Khz
2 = 16KHz

Receive level 0 = -43dB IntDtone1FltrStge1A2 200 383 0xFD36 1 0xFFFF

1 = -48dB

Carrier receive threshhold (in dB) with a 6 dB 0 ~ 255 (-dB) IntDtone1FltrStge1A3 200 384 0x0000 0 0xFFFF
DSP/DAA offset. This parameter should bet
set to the required threshold + 6dB gain

Tx level of DTMF high freq group 0 ~ 30 (0 ~ -15 dBm) 1 = - 0.5 dB step IntDtone1FltrStge1B1 200 385 0x7243 1 0xFFFF

Tx level of DTMF high freq group 0 ~ 15 (- dB) IntDtone1FltrStge1B2 200 386 0xC63E 1 0xFFFF

Tx level of DTMF low freq group 0 ~ 30 (0 ~ -15 dBm) 1 = - 0.5 dB step IntDtone1FltrStge2A1 200 387 0x02CA 1 0xFFFF

DTMF ToneTime 0 ~ 30000 ms units IntDtone1FltrStge2A2 200 388 0x0593 1 0xFFFF

DTMF Tone and Interdigit duration 0 ~ 255 ms IntDtone1FltrStge2A3 200 389 0x02CA 1 0xFFFF

DTMF Interdigit Time 0 ~ 30000 ms units IntDtone1FltrStge2B1 200 390 0x7243 1 0xFFFF

Delay between faxes Guard delay between outgoing faxes IntDtone1FltrStge2B2 200 391 0xC63E 1 0xFFFF
(seconds)

Line 1 impedance 0 - Complex IntDtone1LwPssFdback 200 392 0x7E67 1 0xFFFF

1 - 600ohms

Line 1 impedance 0 - CSP1034 (internal) IntDtone1LwPssGain 200 393 0x02DF 1 0xFFFF

1 - Real (unused)
2 - Complex (external)

Line 2 impedance 0 - Complex IntDtone1UprThrshold 200 394 0x2A00 1 0xFFFF

1 - 600ohms

Line 2 impedance 0 - CSP1034 (internal) IntDtone1LwrThrshold 200 395 0x1C00 1 0xFFFF

1 - Real (unused)
2 - Complex (external)

Line 1 Current 0 - Off DetTonesBeforeDial 200 396 0 0 1

1 - On

Line 1 Current Limit 0 - Off DetTonesBeforeDial 200 396 1 0 2

1 - On

Line 2 Current 0 - Off TimeBeforeDial 200 397 13 0 255

1 - On

Line 2 Current Limit 0 - Off TimeBeforeDial 200 397 2 0 65

1 - On

Ring detector dwell 350 msec PulseDialMake 200 398 40 0 255

Ring detector min freq N = 2400 / Frequency PulseDialMake 200 398 0x23 0x00 0xFF

Ring detector minimum frequency (max 0 ~ 255; expressed as PulseDialBreak 200 399 60 0 255
period) 1000 / (0.833 x min ring frequency)

A-88 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Ring detector max freq N = 2400 / Frequency PulseDialBreak 200 399 0x42 0x00 0xFF

Ring detector maximum frequency (min 0 ~ 255; expressed as PulseDialInterdigit 200 400 80 0 255
period) 1000 / (0.833 x max ring frequency)

Ring 1 detection algorithm 0x20 DetTonesAfterDial 200 401 1 0 3

Ring 1 number cell pattern Number of patterns to describe the DetTonesAfterDial 200 401 1 0 1
sequence

Ring 1 timeout reset detector milliseconds T0Timeout 200 402 45 0 255

Ring timeout reset detector 0 ~ 255 (x100 ms) T0Timeout 200 402 55 0 255

Ring 1 make min 1 milliseconds AbandonCall 200 403 0 0 1

Ring make minimum 0 ~ 255 (x10 ms) FaxTxSignalLevLn1Ln2 200 404 10 0 15

Ring 1 make max 1 milliseconds FaxTxSignalLevLn1Ln2 200 404 0x0C 0x00 0x14

Ring 1 make hole 1 milliseconds BillingFilterTypeLn1 200 405 0 0 2

Ring 1 break min 1 milliseconds BillingFilterTypeLn2 200 406 0 0 2

Ring break minimum 0 - 255 (x100 ms) FaxReceiveLevel 200 407 0 0 1

Ring 1 break max 1 milliseconds FaxReceiveLevel 200 407 0x2e 0x00 0xFF

Ring 1 break hole 1 milliseconds FaxDTMFHighFreqLevel 200 408 8 0 30

Ring 1 idx next cell 1 Index of next pattern FaxDTMFHighFreqLevel 200 408 8 0 15

Ring 1 idx restart cell 1 Index to restart at FaxDTMFLowFreqLevel 200 409 10 0 30

Ring 1 flag detection performed 1 Is this the last detection pattern? FaxDTMFToneTime 200 410 80 0 30000

Ring 1 make min 2 milliseconds FaxDTMFToneTime 200 410 100 0 255

Ring 1 make max 2 milliseconds FaxDTMFIntdigitTime 200 411 75 0 30000

Ring 1 make hole 2 milliseconds FaxDelayBetweenFaxes 200 412 3 1 10

Ring 1 break min 2 milliseconds Line 1 Impedance 200 413 0 0 1

Ring 1 break max 2 milliseconds Line 1 Impedance 200 413 0 0 2

Ring 1 break hole 2 milliseconds Line 2 Impedance 200 414 0 0 1

Ring 1 idx next cell 2 Index of next pattern Line 2 Impedance 200 414 0 0 2

Ring 1 idx restart cell 2 Index to restart at Line 1 Current 200 415 1 0 1

Ring 1 flag detection performed 2 Is this the last detection pattern? Line 1 Current 200 415 0 0 1

Ring 1 make min 3 milliseconds Line 2 Current 200 416 1 0 1

Ring 1 make max 3 milliseconds Line 2 Current 200 416 0 0 1

Ring 1 make hole 3 milliseconds FaxRingDetectorDwell 200 417 350 1 10000

Ring 1 break min 3 milliseconds RingDetectorMinFreq 200 418 0xA0 1 0xFFFF

Ring 1 break max 3 milliseconds RingDetectorMinFreq 200 418 0x55 0 0xFF

Ring 1 break hole 3 milliseconds RingDetectorMaxFreq 200 419 0x23 1 0xFFFF

Ring 1 idx next cell 3 Index of next pattern RingDetectorMaxFreq 200 419 0x12 0 0xFF

Ring 1 idx restart cell 3 Index to restart at Ring1DetectAlgorithm 200 420 0x20 0x20 0x21

Ring 1 flag detection performed 3 Is this the last detection pattern? Ring1NumCellPattern 200 421 1 0 3

Ring 2 detection algorithm Ring1TmoutRsetDetect 200 422 8000 1000 15000

Ring 2 number cell pattern Number of ring pattern detectors Ring1TmoutRsetDetect 200 422 0x50 0 0xFF

Ring 2 timeout reset detector milliseconds FaxRing1MakeMin1 200 423 150 0 10000

Ring 2 make min 1 milliseconds FaxRing1MakeMin1 200 423 0x0E 0 0xFF

Ring 2 make max 1 milliseconds FaxRing1MakeMax1 200 424 5000 0 10000

Ring 2 make hole 1 milliseconds FaxRing1MakeHole1 200 425 100 0 10000

WorkCentre 6400 Service Manual A-89

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Ring 2 break min 1 milliseconds FaxRing1BreakMin1 200 426 125 0 10000

Ring 2 break max 1 milliseconds FaxRing1BreakMin1 200 426 0x1E 0 0xFF

Ring 2 break hole 1 milliseconds FaxRing1BreakMax1 200 427 5500 0 10000

Ring 2 idx next cell 1 Index of next pattern FaxRing1BreakHole1 200 428 100 0 10000

Ring 2 idx restart cell 1 Index to restart at FaxRing1IdxNextCell1 200 429 0 0 2

Ring 2 flag detection performed 1 Is this the last detection pattern? Ring1IdxRestartCell1 200 430 0 0 2

Ring 2 make min 2 milliseconds Ring1FlgDetectPerfd1 200 431 1 0 1

Ring 2 make max 2 milliseconds FaxRing1MakeMin2 200 432 0 0 10000

Ring 2 make hole 2 milliseconds FaxRing1MakeMax2 200 433 0 0 10000

Ring 2 break min 2 milliseconds FaxRing1MakeHole2 200 434 0 0 10000

Ring 2 break max 2 milliseconds FaxRing1BreakMin2 200 435 0 0 10000

Ring 2 break hole 2 milliseconds FaxRing1BreakMax2 200 436 0 0 10000

Ring 2 idx next cell 2 Index of next pattern FaxRing1BreakHole2 200 437 0 0 10000

Ring 2 idx restart cell 2 Index to restart at FaxRing1IdxNextCell2 200 438 0 0 2

Ring 2 flag detection performed 2 Is this the last detection pattern? Ring1IdxRestartCell2 200 439 0 0 2

Ring 2 make min 3 milliseconds Ring1FlgDetectPerfd2 200 440 0 0 1

Ring 2 make max 3 milliseconds FaxRing1MakeMin3 200 441 0 0 10000

Ring 2 make hole 3 milliseconds FaxRing1MakeMax3 200 442 0 0 10000

Ring 2 break min 3 milliseconds FaxRing1MakeHole3 200 443 0 0 10000

Ring 2 break max 3 milliseconds FaxRing1BreakMin3 200 444 0 0 10000

Ring 2 break hole 3 milliseconds FaxRing1BreakMax3 200 445 0 0 10000

Ring 2 idx next cell 3 Index of next pattern FaxRing1BreakHole3 200 446 0 0 10000

Ring 2 idx restart cell 3 Index to restart at FaxRing1IdxNextCell3 200 447 0 0 2

Ring 2 flag detection performed 3 Is this the last detection pattern? Ring1IdxRestartCell3 200 448 0 0 2

Dtone 1 Filter stage 1 A1 0x02CA Ring1FlgDetectPerfd3 200 449 0 0 1

Dtone 1 Filter stage 1 A2 0xFD36 Ring2DetectAlgorithm 200 450 0x20 0x20 0x21

Dtone 1 Filter stage 1 A3 0x0000 Ring2NumCellPattern 200 451 0 0 3

Dtone 1 Filter stage 1 B1 0x7243 Ring2TmoutResetDetct 200 452 8000 1000 15000

Dtone 1 Filter stage 1 B2 0xC63E FaxRing2MakeMin1 200 453 0 0 10000

Dtone 1 Filter stage 2 A1 0x02CA FaxRing2MakeMax1 200 454 0 0 10000

Dtone 1 Filter stage 2 A2 0x0593 FaxRing2MakeHole1 200 455 0 0 10000

Dtone 1 Filter stage 2 A3 0x02CA FaxRing2BreakMin1 200 456 0 0 10000

Dtone 1 Filter stage 2 B1 0x7243 FaxRing2BreakMax1 200 457 0 0 10000

Dtone 1 Filter stage 2 B2 0xC63E FaxRing2BreakHole1 200 458 0 0 10000

Dtone 1 Low Pass Feedback 0x7E67 FaxRing2IdxNextCell1 200 459 0 0 2

Dtone 1 Low Pass Gain 0x02DF Ring2IdxRestartCell1 200 460 0 0 2

Dtone 1 Upper Threshold 0x2A00 Ring2FlgDetectPerfd1 200 461 1 0 1

Dtone 1 Lower Threshold 0x1C00 FaxRing2MakeMin2 200 462 0 0 10000

Dtone Lower Threshold 0 ~ 255 (-dB) FaxRing2MakeMax2 200 463 0 0 10000

Dtone 2 Filter stage 1 A1 0x02CA FaxRing2MakeHole2 200 464 0 0 10000

Dtone 2 Filter stage 1 A2 0xFD36 FaxRing2BreakMin2 200 465 0 0 10000

Dtone 2 Filter stage 1 A3 0x0000 FaxRing2BreakMax2 200 466 0 0 10000

A-90 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Dtone 2 Filter stage 1 B1 0x7243 FaxRing2BreakHole2 200 467 0 0 10000

Dtone 2 Filter stage 1 B2 0xC63E FaxRing2IdxNextCell2 200 468 0 0 2

Dtone 2 Filter stage 2 A1 0x02CA Ring2IdxRestartCell2 200 469 0 0 2

Dtone 2 Filter stage 2 A2 0x0593 Ring2FlgDetectPerfd2 200 470 0 0 1

Dtone 2 Filter stage 2 A3 0x02CA FaxRing2MakeMin3 200 471 0 0 10000

Dtone 2 Filter stage 2 B1 0x7243 FaxRing2MakeMax3 200 472 0 0 10000

Dtone 2 Filter stage 2 B2 0xC63E FaxRing2MakeHole3 200 473 0 0 10000

Dtone 2 Low Pass Feedback 0x7E67 FaxRing2BreakMin3 200 474 0 0 10000

Dtone 2 Low Pass Gain 0x02DF FaxRing2BreakMax3 200 475 0 0 10000

Dtone 2 Upper Threshold 0x2A00 FaxRing2BreakHole3 200 476 0 0 10000

Dtone 2 Lower Threshold 0x1C00 FaxRing2IdxNextCell3 200 477 0 0 2

Dtone 1 detection algorithm Ring2IdxRestartCell3 200 478 0 0 2

Dtone 1 number cell pattern Number of patterns to describe the Ring2FlgDetectPerfd3 200 479 0 0 1
sequence

Dtone 1 timeout reset detector milliseconds Dtone1FilterStage1A1 200 480 0x02CA 0 0xFFFF

Dtone 1 make min 1 milliseconds Dtone1FilterStage1A2 200 481 0xFD36 0 0xFFFF

Dtone 1 make max 1 milliseconds Dtone1FilterStage1A3 200 482 0x0000 0 0xFFFF

Dtone 1 make hole 1 milliseconds Dtone1FilterStage1B1 200 483 0x7243 0 0xFFFF

Dtone make hole 0 ~ 255 (ms) Dtone1FilterStage1B2 200 484 0xC63E 0 0xFFFF

Dtone 1 break min 1 milliseconds Dtone1FilterStage2A1 200 485 0x02CA 0 0xFFFF

Dtone 1 break max 1 milliseconds Dtone1FilterStage2A2 200 486 0x0593 0 0xFFFF

Dtone 1 break hole 1 milliseconds Dtone1FilterStage2A3 200 487 0x02CA 0 0xFFFF

Dtone 1 idx next cell 1 Index of next pattern Dtone1FilterStage2B1 200 488 0x7243 0 0xFFFF

Dtone 1 idx restart cell 1 Index to restart at Dtone1FilterStage2B2 200 489 0xC63E 0 0xFFFF

Dtone 1 flag detection performed 1 Is this the last detection pattern? Dtone1LowPassFeedbck 200 490 0x7E67 1 0xFFFF

Dtone 1 make min 2 milliseconds FaxDtone1LowPassGain 200 491 0x02DF 1 0xFFFF

Dtone 1 make max 2 milliseconds Dtone1UpperThreshold 200 492 0x2A00 1 0xFFFF

Dtone 1 make hole 2 milliseconds Dtone1LowerThreshold 200 493 0x1C00 1 0xFFFF

Dtone 1 break min 2 milliseconds Dtone1LowerThreshold 200 493 0x28 0 0xFF

Dtone 1 break max 2 milliseconds Dtone2FilterStage1A1 200 494 0x02CA 0 0xFFFF

Dtone 1 break hole 2 milliseconds Dtone2FilterStage1A2 200 495 0xFD36 0 0xFFFF

Dtone 1 idx next cell 2 Index of next pattern Dtone2FilterStage1A3 200 496 0x0000 0 0xFFFF

Dtone 1 idx restart cell 2 Index to restart at Dtone2FilterStage1B1 200 497 0x7243 0 0xFFFF

Dtone 1 flag detection performed 2 Is this the last detection pattern? Dtone2FilterStage1B2 200 498 0xC63E 0 0xFFFF

Dtone 1 make min 3 milliseconds Dtone2FilterStage2A1 200 499 0x02CA 0 0xFFFF

Dtone 1 make max 3 milliseconds Dtone2FilterStage2A2 200 500 0x0593 0 0xFFFF

Dtone 1 make hole 3 milliseconds Dtone2FilterStage2A3 200 501 0x02CA 0 0xFFFF

Dtone 1 break min 3 milliseconds Dtone2FilterStage2B1 200 502 0x7243 0 0xFFFF

Dtone 1 break max 3 milliseconds Dtone2FilterStage2B2 200 503 0xC63E 0 0xFFFF

Dtone 1 break hole 3 milliseconds Dtone2LwPassFeedback 200 504 0x7E67 1 0xFFFF

Dtone 1 idx next cell 3 Index of next pattern FaxDtone2LowPassGain 200 505 0x02DF 1 0xFFFF

Dtone 1 idx restart cell 3 Index to restart at Dtone2UpperThreshold 200 506 0x2A00 1 0xFFFF

WorkCentre 6400 Service Manual A-91

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Dtone 1 flag detection performed 3 Is this the last detection pattern? Dtone2LowerThreshold 200 507 0x1C00 1 0xFFFF

Dtone 2 detection algorithm Dtone1DetctAlgorithm 200 508 0x20 0x20 0x21

Dtone 2 number cell pattern Number of ring pattern detectors Dtone1NumCellPattern 200 509 1 0 3

Dtone 2 timeout reset detector milliseconds Dtone1TmoutRsetDetct 200 510 100 1 15000

Dtone 2 make min 1 milliseconds FaxDtone1MakeMin1 200 511 600 0 10000

Dtone 2 make max 1 milliseconds FaxDtone1MakeMax1 200 512 3700 0 10000

Dtone 2 make hole 1 milliseconds FaxDtone1MakeHole1 200 513 130 0 10000

Dtone 2 break min 1 milliseconds FaxDtone1MakeHole1 200 513 0x32 0 0xFF

Dtone 2 break max 1 milliseconds FaxDtone1BreakMin1 200 514 550 0 10000

Dtone 2 break hole 1 milliseconds FaxDtone1BreakMax1 200 515 550 0 10000

Dtone 2 idx next cell 1 Index of next pattern FaxDtone1BreakHole1 200 516 0 0 10000

Dtone 2 idx restart cell 1 Index to restart at FaxDtone1IdxNxtCell1 200 517 0 0 0xff

Dtone 2 flag detection performed 1 Is this the last detection pattern? Dtone1IdxRestrtCell1 200 518 0 0 2

Dtone 2 make min 2 milliseconds Dtone1FlgDetctPerfd1 200 519 1 0 1

Dtone 2 make max 2 milliseconds FaxDtone1MakeMin2 200 520 0 0 10000

Dtone 2 make hole 2 milliseconds FaxDtone1MakeMax2 200 521 0 0 10000

Dtone 2 break min 2 milliseconds FaxDtone1MakeHole2 200 522 0 0 10000

Dtone 2 break max 2 milliseconds FaxDtone1BreakMin2 200 523 0 0 10000

Dtone 2 break hole 2 milliseconds FaxDtone1BreakMax2 200 524 0 0 10000

Dtone 2 idx next cell 2 Index of next pattern FaxDtone1BreakHole2 200 525 0 0 10000

Dtone 2 idx restart cell 2 Index to restart at FaxDtone1IdxNxtCell2 200 526 0 0 0xff

Dtone 2 flag detection performed 2 Is this the last detection pattern? Dtone1IdxRestrtCell2 200 527 0 0 2

Dtone 2 make min 3 milliseconds Dtone1FlgDetctPerfd2 200 528 0 0 1

Dtone 2 make max 3 milliseconds FaxDtone1MakeMin3 200 529 0 0 10000

Dtone 2 make hole 3 milliseconds FaxDtone1MakeMax3 200 530 0 0 10000

Dtone 2 break min 3 milliseconds FaxDtone1MakeHole3 200 531 0 0 10000

Dtone 2 break max 3 milliseconds FaxDtone1BreakMin3 200 532 0 0 10000

Dtone 2 break hole 3 milliseconds FaxDtone1BreakMax3 200 533 0 0 10000

Dtone 2 idx next cell 3 Index of next pattern FaxDtone1BreakHole3 200 534 0 0 10000

Dtone 2 idx restart cell 3 Index to restart at FaxDtone1IdxNxtCell3 200 535 0 0 2

Dtone 2 flag detection performed 3 Is this the last detection pattern? Dtone1IdxRestrtCell3 200 536 0 0 2

The maximum range for the auto redial 0 to 14 Dtone1FlgDetctPerfd3 200 537 0 0 1
attempts displayed in SA/KO. Linked to ID204

Application of very low impedance for 0=disabled, Dtone2DetctAlgorithm 200 538 0x20 0x20 0x21
approximately 350ms at line seizure 1 = Enabled

Pause time 0 ~ 255 seconds DtoneNumCellPattern 200 539 0 0 3

Dialing Pause time 0 ~ 65 seconds DtoneTmoutResetDetct 200 540 100 1 15000

Ring detector min freq Line2 N = 2400 / Frequency FaxDtone2MakeMin1 200 541 0 0 10000

Ring detector max freq Line2 N = 2400 / Frequency FaxDtone2MakeMax1 200 542 0 0 10000

Int Dtone detection algorithm FaxDtone2MakeHole1 200 543 0 0 10000

Int Dtone number cell pattern Number of patterns to describe the FaxDtone2BreakMin1 200 544 0 0 10000
sequence

Int Dtone timeout reset detector milliseconds FaxDtone2BreakMax1 200 545 0 0 10000

A-92 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Int Dtone make min 1 milliseconds FaxDtone2BreakHole1 200 546 0 0 10000

Int Dtone make max 1 milliseconds FaxDtone2IdxNxtCell1 200 547 0 0 0xff

Int Dtone make hole 1 milliseconds Dtone2IdxRestrtCell1 200 548 0 0 2

Int. Dtone 1 break min 1 milliseconds Dtone2FlgDetctPerfd1 200 549 0 0 1

Int Dtone break max 1 milliseconds FaxDtone2MakeMin2 200 550 0 0 10000

Int Dtone break hole 1 milliseconds FaxDtone2MakeMax2 200 551 0 0 10000

Int Dtone idx next cell 1 Index of next pattern FaxDtone2MakeHole2 200 552 0 0 10000

Int Dtone idx restart cell 1 Index to restart at FaxDtone2BreakMin2 200 553 0 0 10000

Int Dtone flag detection performed 1 Is this the last detection pattern? FaxDtone2BreakMax2 200 554 0 0 10000

Int Dtone make min 2 milliseconds FaxDtone2BreakHole2 200 555 0 0 10000

Int Dtone make max 2 milliseconds FaxDtone2IdxNxtCell2 200 556 0 0 0xff

Int Dtone make hole 2 milliseconds Dtone2IdxRestrtCell2 200 557 0 0 2

Int Dtone break min 2 milliseconds Dtone2FlgDetctPerfd2 200 558 0 0 1

Int Dtone break max 2 milliseconds FaxDtone2MakeMin3 200 559 0 0 10000

Int Dtone break hole 2 milliseconds FaxDtone2MakeMax3 200 560 0 0 10000

Int Dtone idx next cell 2 Index of next pattern FaxDtone2MakeHole3 200 561 0 0 10000

Int Dtone idx restart cell 2 Index to restart at FaxDtone2BreakMin3 200 562 0 0 10000

Int Dtone flag detection performed 2 Is this the last detection pattern? FaxDtone2BreakMax3 200 563 0 0 10000

Int Dtone make min 3 milliseconds FaxDtone2BreakHole3 200 564 0 0 10000

Int Dtone make max 3 milliseconds FaxDtone2IdxNxtCell3 200 565 0 0 2

Int Dtone make hole 3 milliseconds Dtone2IdxRestrtCell3 200 566 0 0 2

Int Dtone break min 3 milliseconds Dtone2FlgDetctPerfd3 200 567 0 0 1

Int Dtone break max 3 milliseconds FaxMaxAutoRedials 200 568 0 0 14

Int Dtone break hole 3 milliseconds LowImpAtLineSeize 200 569 0 0 1

Int Dtone idx next cell 3 Index of next pattern FaxPauseTimeDefault 200 570 3 0 255

Int Dtone idx restart cell 3 Index to restart at FaxPauseTimeDefault 200 570 3 0 65

Int Dtone flag detection performed 3 Is this the last detection pattern? RingDetectorMinFreq2 200 571 0xA0 1 0xFFFF

Dial tone & call progress frequency filter 0 = 340 - 560 Hz RingDetectorMaxFreq2 200 572 0x23 1 0xFFFF
index 1 = 310 - 485 Hz
2 = 363 - 502 Hz
3 = 276 - 504 Hz
4 = 415 - 460 Hz
5 = 310 - 640 Hz
6 = 370 - 525 Hz

Dial tone detection time-out while detecting 0 ~ 255 (seconds) FaxIntDtoneDetctAlg 200 573 0x20 0x20 0x21
dial tone within the dial string (e.
International dial tone)

DTMF high/low level difference (twist) (dB) 0 ~ 5 (dB) FaxIntDtnNumCellPatt 200 574 1 0 3

Dial Tone validation time 0 ~ 255 (x100 ms) FaxIntDtnToutRsetDet 200 575 100 1 15000

Dial tone validation delay (i.e. The wait time 0 ~ 255 (x10 ms) FaxIntDtoneMakeMin1 200 576 600 0 10000
before dial tone detection begins)

Ringer impedance relay Line 1 0 = off FaxIntDtoneMakeMax1 200 577 3700 0 10000
1 = on

Ringer impedance relay Line 2 0 = off FaxIntDtoneMakHole1 200 578 130 0 10000
1 = on

Maximum total pause duration of multiple 0 ~ 255 (seconds) FaxIntDtoneBrekMin1 200 579 550 0 10000
pauses during dialing

WorkCentre 6400 Service Manual A-93

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

ISDN ASR ISDN Answer specified number range 1 or 2 FaxIntDtoneBrkHole1 200 581 0 0 10000
numbers

ISDN PP 0 = Operate point to multipoint protocol FaxIntDtoneIdxNxtC1 200 582 0 0 0xff

1 = Operate point to point protocol

ISDN Overlap receiving 0 = Operate en-block receiving FaxIntDtIdxRestrtC1 200 583 0 0 2

1 = Operate overlap receiving

ISDN Line Type 0 = National ISDN-1 FaxIntDtFlgDtPerfd1 200 584 1 0 1

1 = Northern Telecom (DMS-100)
2 = AT&T Custom (5ESS)
3 = Euro ISDN

Call Hunting 0 = Disabled FaxIntDtoneMakeMin2 200 585 0 0 10000

1 = Enabled

TEI setting 0 ~ 63 (user entered Data) FaxIntDtoneMakeHole2 200 587 0 0 10000

TEI type 0 = Automatic FaxIntDtoneBrkMin2 200 588 0 0 10000

1 = Manual

Ohmic termination 0 = Disabled FaxIntDtoneBrkMax2 200 589 0 0 10000

1 = Enabled

G4 enabled 0 = Disabled FaxIntDtoneBrkHole2 200 590 0 0 10000

1 = Enabled

Reset/Stop card on recoverable fault 0 = Reset FaxIntDtIdxRestrtC2 200 592 0 0 2

1 = Stop

Load jobs at start up 0 = Do not load jobs FaxIntDtFlgDetPrfd2 200 593 0 0 1

1 = Load jobs

Load directories at start up 0 = Do not load directories FaxIntDtoneMakeMin3 200 594 0 0 10000
1 = Load directories

load mailboxes at start up 0 = Do not load mailboxes FaxIntDtoneMakeMax3 200 595 0 0 10000
1 = Load mailboxes

Temporary NVM to Capture the data for a 0 = Disabled FaxIntDtoneMakHole3 200 596 0 0 10000
received page to RAM disk and copy to NVM X = File size in bytes (Max = 0xFFFF)
if errored.

Last allocated user job ID Sets the last allocated user job ID FaxIntDtoneBrkMin3 200 597 0 0 10000

Last allocated recurring job ID Sets the last allocated recurring job ID FaxIntDtoneBrkMax3 200 598 0 0 10000

Completed jobs count Sets the completed jobs count for automatic FaxIntDtoneBrkHole3 200 599 0 0 10000
activity report generation

(Tap 1) Finite impulse response digital filter FaxIntDtoneIdxNxtC3 200 600 0 0 2

with programmable Coefficients

(Tap 2) Finite impulse response digital filter IntDtoneIdxRestrtC3 200 601 0 0 2

with programmable Coefficients

(Tap 3) Finite impulse response digital filter IntDtoneFlgDetPrfd3 200 602 0 0 1

with programmable Coefficients

(Tap 4) Finite impulse response digital filter DToneCPToneFrqFilter 200 603 5 0 6

with programmable Coefficients

(Tap 5) Finite impulse response digital filter IntDToneDetectTime 200 604 0x40 0 0xFF
with programmable Coefficients

(Tap 6) Finite impulse response digital filter DTMFLevelDifference 200 605 2 0 5

with programmable Coefficients

(Tap 7) Finite impulse response digital filter DToneDetectTime 200 606 0x06 0 0xFF
with programmable Coefficients

(Tap 8) Finite impulse response digital filter DToneDetectDelay 200 607 0 0 0xFF
with programmable Coefficients

(Tap 9) Finite impulse response digital filter RingerImpedanceLine1 200 608 1 0 1

with programmable Coefficients

(Tap 10) Finite impulse response digital filter RingerImpedanceLine2 200 609 1 0 1
with programmable Coefficients

A-94 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

(Tap 11) Finite impulse response digital filter TotalPauseTimeLimit 200 610 0x1E 0x00 0xFF
with programmable Coefficients

(Tap 12) Finite impulse response digital filter TonePulseSelection 200 611 0 0 1
with programmable Coefficients

(Tap 13) Finite impulse response digital filter 200 901 0 0 0

with program able Coefficients

(Tap 14) Finite impulse response digital filter 200 902 0 0 0

with programmable Coefficients

(Tap 15) Finite impulse response digital filter FaxISDNASR 200 903 2 1 2
with programmable Coefficients

(Tap 16) Finite impulse response digital filter FaxISDNPP 200 904 1 0 1
with programmable Coefficients

(Tap 17) Finite impulse response digital filter FaxISDNOverlapRec 200 905 0 0 1
with programmable Coefficients

(Tap 18) Finite impulse response digital filter FaxISDNLineType 200 906 0 0 3
with programmable Coefficients

(Tap 19) Finite impulse response digital filter CallHunting 200 907 0 0 1
with programmable Coefficients

(Tap 20) Finite impulse response digital filter 200 908 N/A N/A N/A
with programmable Coefficients

(Tap 21) Finite impulse response digital filter TeiSetting 200 909 0 0 63
with programmable Coefficients

(Tap 22) Finite impulse response digital filter TeiSettingType 200 910 0 0 1
with programmable Coefficients

(Tap 23) Finite impulse response digital filter OhmTermination 200 911 0 0 1
with programmable Coefficients

(Tap 24) Finite impulse response digital filter G4Enabled 200 912 0 0 1
with programmable Coefficients

(Tap 25) Finite impulse response digital filter 200 913 0 0 3

with programmable Coefficients

(Tap 26) Finite impulse response digital filter CardResetStop 201 201 0 0 1
with programmable Coefficients

(Tap 27) Finite impulse response digital filter LoadJobsAtStart 201 202 1 0 1
with programmable Coefficients

(Tap 28) Finite impulse response digital filter LoadDirectrysAtStart 201 203 1 0 1
with programmable Coefficients

(Tap 29) Finite impulse response digital filter LoadMailboxesAtStart 201 204 1 0 1
with programmable Coefficients

(Tap 30)Finite impulse response digital filter SaveCompressedData 201 205 0 0 0xFFFF
with programmable Coefficients

CEQ Transmit path 0 = Disabled LastUserJobID 201 501 999 1 999

1 = Enabled

TX Compromise Equalizer. Specifies slope in 0 = 1 dB (0 KM) LastRecurringJobID 201 502 5199 5000 5199
transmit spectrum (in dB) between 1000Hz 2 = 2 dB (1.8 KM)
and 2800Hz 4 = 4 dB (3.6 KM)
6 = 6 dB (5.6 KM)

CEQ Receive path 0 = Disabled CompletedJobsCount 201 503 0 0 50

1 = Enabled

CEQ Type. switch between default filter 0 = Default CEQTAP1 203 1 0x0714 0 0xFFFF
coefficients and custom settings. 1 = Custom

Total number of CEQ Taps in Use CEQTAP2 203 2 0x0A10 0 0xFFFF

Allow the ability to control the Echo Protect 0 = No EPT CEQTAP3 203 3 0x121B 0 0xFFFF
Tone (EPT) 1 = Short EPT
2 = Long EPT

WorkCentre 6400 Service Manual A-95

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Allow the ability to control the Echo Protect 00000000 = No EPT CEQTAP4 203 4 0x13B9 0 0xFFFF
Tone (EPT). Bit mapped per data rate. 00000001 = 2400 bps EPT
00000010 = 4800 bps EPT
00000100 = V.29 7200 bps EPT
00001000 = V.29 9600 bps EPT
00010000 = V.17 7200 bps EPT
00100000 = V.17 9600 bps EPT
01000000 = V.17 12000 bps EPT
10000000 = V.17 14400 bps EPT

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP5 203 5 0x18B8 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP6 203 6 0x16BD 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP7 203 7 0x12E7 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP8 203 8 0x0E18 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP9 203 9 0x0050 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP10 203 10 0xFF80 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP11 203 11 0xF0F1 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP12 203 12 0xF757 0 0xFFFF

Automatic Rate Adaption for 2400 Baud Rate. CEQTAP13 203 13 0xF84C 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP14 203 14 0xFBBD 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP15 203 15 0x12C0 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP16 203 16 0xFEF3 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP17 203 17 0x19E0 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP18 203 18 0xF6C6 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP19 203 19 0xF6F7 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP20 203 20 0xF9CE 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP21 203 21 0xDBEF 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP22 203 22 0x22DC 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP23 203 23 0xF9F3 0 0xFFFF

Automatic Rate Adaption for 2800 Baud Rate. CEQTAP24 203 24 0x19D5 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP25 203 25 0x1358 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP26 203 26 0xC001 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP27 203 27 0x0324 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP28 203 28 0x25BB 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP29 203 29 0xFD6A 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTAP30 203 30 0xEC5A 0 0xFFFF

Automatic Rate Adaption for 3000 Baud Rate. CEQTX 203 31 1 0 1

Automatic Rate Adaption for 3000 Baud Rate. CEQTX 203 31 4 0 15

Automatic Rate Adaption for 3000 Baud Rate. CEQRX 203 32 0 0 1

Automatic Rate Adaption for 3000 Baud Rate. CEQTYPE 203 33 0 0 1

Automatic Rate Adaption for 3000 Baud Rate. CEQTAPTOTAL 203 34 30 0 30

Automatic Rate Adaption for 3000 Baud Rate. EPTADJUSTMENTS 203 35 2 0 2

Automatic Rate Adaption for 3200 Baud Rate. EPTADJUSTMENTS 203 35 255 0 255

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD2400 203 36 0x55 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD4800 203 37 0x52 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD7200 203 38 0x4F 0 0xFF

A-96 WorkCentre 6400 Service Manual

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD9600 203 39 0x4B 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD12000 203 40 0x44 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD14400 203 41 0x3C 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD16800 203 42 0x35 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD19200 203 43 0x2E 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2400BAUD21600 203 44 0x27 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2800BAUD2400 203 45 0x00 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2800BAUD4800 203 46 0x53 0 0xFF

Automatic Rate Adaption for 3200 Baud Rate. ARA2800BAUD7200 203 47 0x51 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD9600 203 48 0x4F 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD12000 203 49 0x48 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD14400 203 50 0x43 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD16800 203 51 0x3C 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD19200 203 52 0x37 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD21600 203 53 0x30 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD24000 203 54 0x2B 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA2800BAUD26400 203 55 0x26 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD2400 203 56 0x00 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD4800 203 57 0x56 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD7200 203 58 0x53 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD9600 203 59 0x50 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD12000 203 60 0x4C 0 0xFF

Automatic Rate Adaption for 3429 Baud Rate. ARA3000BAUD14400 203 61 0x45 0 0xFF

NVM to store percentage of errored data ARA3000BAUD16800 203 62 0x40 0 0xFF

frames to allow before training down in ECM

Allow the ability to change the modem's 0 = EQT2 is reset following FTT ARA3000BAUD19200 203 63 0x3B 0 0xFF
EQT2 register to 0. 1 = EQT2 is always reset

RLSD Timeout ARA3000BAUD21600 203 64 0x34 0 0xFF

RLSD Threshold 2's complement ARA3000BAUD24000 203 65 0x30 0 0xFF

Set at which signal to noise ratio 3429 baud 0x0D = 12 dB ARA3000BAUD26400 203 66 0x2A 0 0xFF
rate is disabled in v34.

Set at which signal to noise ratio 2400 baud 0x0D = 12 dB ARA3000BAUD28800 203 67 0x24 0 0xFF
rate is forced in v34.

ARA EQM Bias control 2's complement ARA3200BAUD2400 203 68 0x00 0 0xFF

Allow control of the V34 baud rate mask 2400 only = 0x01 ARA3200BAUD4800 203 69 0x58 0 0xFF
Up to 2800 = 0x05
Up to 3000 = 0x0D
Up to 3200 = 0x1D
Up to 3429 = 0x3D

Set Compromise Equalizer in the receive path 0 = Disabled ARA3200BAUD7200 203 70 0x56 0 0xFF
for V.21 Channel 2. 1 = Enabled

MT Fax ring count for auto answer (S0) 0 ~ 255 ARA3200BAUD9600 203 71 0x54 0 0xFF

V.34 to V.21 fallback timing during V.8/V.34 0 ~ 255 (seconds) ARA3200BAUD12000 203 72 0x4F 0 0xFF
failure. Time (in seconds) to wait after
reaching phase 3 of the V.34 negotiation
before falling back to V.21

DC Loop V/I characteristics relay Line 1 0 - off ARA3200BAUD14400 203 73 0x49 0 0xFF
1 - on

WorkCentre 6400 Service Manual A-97

Reference

Fax NVM Value (Continued)

dc131 Display NVM NVM

Description Setting Information Default Min Max
Name ID Index

DC Loop V/I characteristics relay Line 2 0 - off ARA3200BAUD16800 203 74 0x43 0 0xFF
1 - on

Maximum data rate during non-ECM 0 = 2400 bps ARA3200BAUD19200 203 75 0x3E 0 0xFF
communication 1 = 4800 bps
2 = 7200 bps
3 = 9600 bps
4 = 12000 bps
5 = 14400 bps

TCF transmission length extension (time) 0 ~ 255 (x 10 ms) ARA3200BAUD21600 203 76 0x39 0 0xFF

Additional time between DCS and TCF frames 0 ~ 255 (milliseconds) ARA3200BAUD24000 203 77 0x33 0 0xFF
when sending fax

Wait time for silence after receiving a page if 0 ~ 255 (x 10 ms) ARA3200BAUD26400 203 78 0x2A 0 0xFF
carrier was lost

Number of positive detections that are 0 ~ 255 ARA3200BAUD28800 203 79 0x23 0 0xFF
necessary to determine that a V.21 frame not
a high speed frame is received (non-V.34)

Check interval of the V.21 detector bit after 0 ~ 255 (milliseconds) ARA3200BAUD31200 203 80 0x20 0 0xFF
the ignore period is over (non-V.34)

Time to initially ignore V.21 detection at the 0 ~ 255 (x 10 ms) ARA3429BAUD2400 203 81 0x00 0 0xFF
beginning of the RX page data detection
period (non-V.34)

The percentage of a length of all zero bytes 0 ~ 255 ARA3429BAUD4800 203 82 0x5A 0 0xFF
that is normally expected to be received for a
given speed for a TCF to be good.

A-98 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM

The Fax NVM table contains NVM value information that can be used to
adjust the Fax NVM value for the printer.
The Copy Controller NVM table contains NVM value information that can be
used to adjust the NVM value for the printer.

Copy Controller NVM Value

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Compression Mode Compression Mode 600 1 0 0 1

Reserved Blocks Reserved Blocks 600 2 0 0 5

Megs of Memory Megs of Memory 600 3 16 0 65535

EPC memory low percent EPC memory low percent 600 4 38 1 99

Fault Counter 19-401-00: Out of Memory Out Memory Fault - StrNC docFC 600 17 0 0 255
Fault - Stress Document

Fault Counter 19-402-00: Compressor DVMA Timeout FaultFC 600 18 0 0 255

FaultVideoDVMSTimeOutFault (Compressor
DVMA Timeout)

Amount of EPC Memory Memory on Target 600 19 512 0 65535

Fault Counter 22-300-10: AHA End of AHA End of Record Fault 600 20 0 0 255
Record Fault

Time before image disk receives power Disk spin up delay time 600 21 10 0 30
(sec)

Platinum Board Full Concurrency Platinum Board Full Concurrency 600 22 1 0 1

Image disk partition size Image disk partition size 600 23 4 0 30

Image Disk Dirty. Image Disk Dirty. 600 24 0 0 1

IJO Enabled IJO Enabled 600 25 0 0 1

Disk Dirty at power up Disk Dirty at power up 600 26 0 0 1

Retry DMAMASTERABORT REREADS Retry DMAMASTERABORT REREADS 600 27 50 0 255

KDrumPixelCount KDrumPixelCount 600 28 0 0 4.29E+09

CDrumPixelCount CDrumPixelCount 600 29 0 0 4.29E+09

MDrumPixelCount MDrumPixelCount 600 30 0 0 4.29E+09

YDrumPixelCount YDrumPixelCount 600 31 0 0 4.29E+09

vramLevel1RecThreshold vramLevel1RecThreshold 600 32 3E+08 0 4.29E+09

vramLevel1TripThreshold vramLevel1TripThreshold 600 33 2E+08 0 4.29E+09

vramLevel2RecThreshold vramLevel2RecThreshold 600 34 2E+08 0 4.29E+09

vramLevel2TripThreshold vramLevel2TripThreshold 600 35 2E+08 0 4.29E+09

vramLevel3RecThreshold vramLevel3RecThreshold 600 36 2E+08 0 4.29E+09

vramLevel3TripThreshold vramLevel3TripThreshold 600 37 1E+08 0 4.29E+09

vramLevel4RecThreshold vramLevel4RecThreshold 600 38 1E+08 0 4.29E+09

vramLevel4TripThreshold vramLevel4TripThreshold 600 39 8E+07 0 4.29E+09

vramLevel5RecThreshold vramLevel5RecThreshold 600 40 7E+07 0 4.29E+09

vramLevel5TripThreshold vramLevel5TripThreshold 600 41 4E+07 0 4.29E+09

vramLevel6RecThreshold vramLevel6RecThreshold 600 42 4E+07 0 4.29E+09

vramLevel6TripThreshold vramLevel6TripThreshold 600 43 1E+06 0 4.29E+09

cacheAllImagesToDisk cacheAllImagesToDisk 600 44 0 0 1

WorkCentre 6400 Service Manual A-99

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Interval of APS recognition of standard APSPaperSizeInterval 603 1 5 1 65535

size.(mm)

Determines whether APS requires input to APSStandardSizeRequired 603 2 0 0 1

be a standard size.
0=False (Off), 1=True (On)

Number of images inputted before simplex CopySimplexOutputStart 603 3 1 0 65535

copy job is released for marking.

Number of images inputted before duplex CopyDuplexOutputStart 603 4 4 0 65535

copy job is released for marking.

The priority set by SA/KO of copy job (used CopyJobPriority 603 5 3 0 65535
for job contention).

Determines whether copy marked images COPYMarkedImagesDisplayable 603 8 1 0 1

counter is displayable. 0=False, 1=True

Determines whether copy sheets counter is COPYSheetsDisplayable 603 10 0 0 1

displayable. 0=False, 1=True

Determines whether copy duplex sheets COPYDuplexSheetsDisplayable 603 12 0 0 1

counter is displayabled. 0=false, 1=true

Determines whether copy 11x17 A3 sheets COPYLargeSheetsDisplayable 603 14 0 0 1

counter is displayable. 0=False, 1=True

Determines whether copy job recovery is crashRecoveryEnabled 603 24 1 0 1

enabled. 0=False, 1=True

Disable /enable ABS prescan. ABSPrescanAllowed 603 25 0 0 1

0=False, 1=True

Determines whether copy image counter is COPYMarkedColorImagesDisplay 603 36 1 0 1

displayable. 0=False, 1=True

Determines whether color copy sheets COPYColorSheetsDisplay 603 37 0 0 1

counter is displayable. 0=False, 1=True

Determines whether color copy duplex COPYDuplexColorSheetsDisplay 603 38 0 0 1

sheets counter is displayable.
0=False, 1=True

Determines whether large copy sheets COPYLargeColorSheetsDisplay 603 39 0 0 1

counter is displayable. 0=False, 1=True

CopyJobReleaseThreshold CopyJobReleaseThreshold 603 46 2 1 4

Defines feeder module types Feeder module types: Feeder Module Type 604 1 0 0 255
0=Invalid Module
55=SMH
57=HCF
58=HCFwithCovers
60=PFP
62=EnvelopeFeeder
221 = IotPFPStd,
222 = IotPFPA4LEFA3SEF/ A3
SEF */
223 = IotPFPLetterLEFTabSEF/
Tabloid SEF */
224 = IotPFPA4SEF
225 = IotPFPLetterSEFLegalSEF/
Legal SEF */

Finisher module type.The finisher module Defines finisher module types Finisher Module Type 604 2 100 65 255
that has been DETECTED by the system. 65=OCT
(Read Only) 70=BasicDiskFinisher
75=HighCapacityFinisher
80=Mailbox20Bin
100=NoFinisher
110=LCSS2K
120=LCSS1K
171=HVF
172=HVF_BM
173=HVF_Inserter
174=HVF_BM_Inserter
175=HVF_TriFolder
176=HVF_TriFolder_Inserter

A-100 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Defines Default color Default color settings: MSDefaultColor 604 4 0 0 20

0=White
1=Green
2=Buff
3=Yellow
4=Goldenrod
5=Blue
6=Pink
7=Transparent
8=Ivory
9=Gray
10=Red
11=Orange

Defines Default type Default type settings: MSDefaultType 604 6 0 0 60

0=Standard
1=Drilled (pre-punched)
2=Envelope
4=Transparency
5=Letterhead
6=Labels
7=Recycled

Defines medium weight (not used) (gsm) NOT USED MSDefaultWeight 604 8 75 56 203

Resume Time out Resume Time out settings: PEAutoResume 604 10 30 0 120
0=Disable
>0=Time in seconds (sec)

Debug switch Debug switch settings: PrintModuleInfo 604 17 0 0 1

0=Off
1=On

Enable display of "Total Images" 0=False, Display of "Total Images" settings: Total Images Displayable 604 21 1 0 1
1=True 0=Off
1=On

Default finisher auto resume Default finisher auto resume MSDefaultFinisherAR 604 70 30 0 120
settings:
0=Disabled
>0= Time in seconds (sec)

Enable Face up Face up settings: MSFaceUpEnable 604 84 0 0 1

0=Off (normal delivery)
1=Deliver face up

MSDefaultTrayTrain 604 112 0 0 2

MSDefaultTrayStack 604 113 0 0 1

MSDefaultTrayId 604 114 0 0 4

Propose Count No Finisher 604 115 12 2 16

Last image ID to recover LastImageIDToRecover 604 118 0 0 65535

IOT comm fault counter iotCommFaultCount 604 119 0 0 3

Quantity to recover QtyToRecover 604 123 0 0 65535

Default decurler level Default decurler setting: MSDefaultDecurler 604 125 0 0 2

0=Low decurling
1=Normal decurling
2=High decurling

Enable Offset policy Enable Offset policy MSOffsetEnabledPolicy 604 127 1 0 1

0=Off
1=On

Serial number set. SerNumSet 604 128 0 0 1

Out of staples policy Out of staples policy settings: MSOutOfStaplesPolicy 604 129 1 0 1
0=Hold
1=Stapling defeated

ProdCfgNvm ProdCfgNvm 604 131 0 0 65535

Last sheet to recover Last sheet to recover 604 132 106 0 108

Module has been setup ModuleHasBeenSetUp 604 134 0 0 1

WorkCentre 6400 Service Manual A-101

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Propose Count MCSS Finisher Propose Count MCSS Finisher 604 137 12 2 16

IOT Diag Enter TO SEC IOT Diag Enter TO SEC 604 138 30 0 1800

IOT Diag Exit TO SEC IOT Diag Exit TO SEC 604 139 30 0 1800

IOT Diag Test Pattern TO SEC IOT Diag Test Pattern TO SEC 604 140 0 0 1800

IOT Diag Device Status TO SEC IOT Diag Device Status TO SEC 604 141 0 0 1800

IOT Diag Analog Monitor TO SEC IOT Diag Analog Monitor TO SEC 604 142 0 0 1800

IOT Diag In Out Manual TO SEC IOT Diag In Out Manual TO SEC 604 143 0 0 1800

IOT Diag PP Timing TO SEC IOT Diag PP Timing TO SEC 604 144 0 0 1800

IOT Diag MSI Side Guide TO SEC IOT Diag MSI Side Guide TO SEC 604 145 0 0 1800

IOT Diag Sys Regi TO SEC IOT Diag Sys Regi TO SEC 604 146 0 0 1800

IOT Diag Reg Setup TO SEC IOT Diag Reg Setup TO SEC 604 147 0 0 1800

IOT Diag Reg Check TO SEC IOT Diag Reg Check TO SEC 604 148 0 0 1800

IOT Diag Reg Sens Check TO SEC IOT Diag Reg Sens Check TO SEC 604 149 0 0 1800

IOT ATC Sensor Setup TO SEC IOT ATC Sensor Setup TO SEC 604 150 0 0 1800

IOT Diag Belt Edge Learn TO SEC IOT Diag Belt Edge Learn TO SEC 604 151 0 0 1800

IOT TRC Adjust TO SEC IOT TRC Adjust TO SEC 604 152 0 0 1800

IOT Diag Tone Up Down TO SEC IOT Diag Tone Up Down TO SEC 604 153 0 0 1800

IOT Diag No Paper Run TO SEC IOT Diag No Paper Run TO SEC 604 154 0 0 1800

IOT Diag ProCon On Off TO SEC IOT Diag ProCon On Off TO SEC 604 155 0 0 1800

IOT Diag Binary Cal TO SEC IOT Diag Binary Cal TO SEC 604 156 0 0 1800

IOT Diag Fold Position TO SEC IOT Diag Fold Position TO SEC 604 157 0 0 1800

IOT Diag CTRACS TO SEC IOT Diag CTRACS TO SEC 604 158 0 0 1800

IOT Diag Comp Ctrl TO SEC IOT Diag Comp Ctrl TO SEC 604 159 0 0 1800

Fault Counter 03-316: CCMCannotCommunicateWithIotFC 604 160 0 0 255

CCMCannotCommunicateWithIotFC

Fault Counter 77-312: FeederCommFailCountFC 604 308 0 0 255

FeederCommFailCountFC

Fault Counter 91-313: CrumAsicCommFailCountFC 604 336 0 0 255

CrumAsicCommFailCountFC

Fault Counter 91-320: CCWireCutFailCountFC 604 337 0 0 255

CCWireCutFailCountFC

# of bins MSDefaultPrintBin 604 415 4 0 4

# of bins MSDefaultCopyBin 604 416 4 0 4

# of bins MSDefaultFaxBin 604 417 0 0 4

# of bins MSDefaultOtherBin 604 418 4 0 4

Enable Auto Hold Enable Auto Hold settings: MSAutoHoldEnable 604 419 1 0 1
0=Off
1=On

Interrupt image to recover # of images InteruptImageIDToRecover 604 422 0 0 65535

Interrupt quantity to recover QtyToRecover; 604 426 0 0 65535

Interrupt last sheet to recover lastSheetToRecover 604 427 0 0 65535

Media Size Conversion Policy Media Size Conversion Policy MSMediaSizeConvPolicy 604 428 1 0 1
settings:
0=Off
1=On

MSInvertDuplex 604 432 0 0 1

A-102 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

MSMirrorInvertDuplex 604 433 1 0 1

Total Color Images Displayable 604 434 1 0 1

Total BW & Color Images Displayable Total BW & Color Images Display 604 435 1 0 1

Media Order Group 1 = MSGXc MSMediaSizeGroup 604 442 1 1 7

2 = MSGXe
3 = MSGFx
4 = MSGFxap
5 = MSGGco
6 = MSGDmoEast
7 = MSGDmoWest

Finisher Hole Punch Configuration HolePunchConfiguration 604 979 0 0 3

Enable Display of Large Marked Images 0=No Display Total Large Marked Images Disp 604 982 1 0 1
Counter 1=Displayed

Enable Display of Large Black Marked 0=No Display Total Large Blk Marked Imgs Disp 604 983 1 0 1
Images Counter 1=Displayed

Enable Display of Large Colour Marked 0=No Display Total Large Col Marked Imgs Disp 604 984 1 0 1
Images Counter 1=Displayed

Enable Print Job Recovery Print Job Recovery enable PrintCrashRecoveryEnable 605 2 1 0 1
Settings
0=No Recovery
1=Recovered

This holds the crash recovery print job MFPrintCompletedJob Log Location 605 3 0 0 12
information on the altanta side.

Enable Option to export marked image 0=No export MFPRINTMarkedImagesDisplayable 605 6 1 0 1

counter information to clients 1=Exported

Enable Option to export printed sheets 0=No export MFPRINTSheetsDisplayable 605 8 0 0 1

counter information to clients 1=Exported

Enable Option to export Duplexed counter 0=No export MFPRINTDuplexSheetsDisplayable 605 10 0 0 1

information to clients 1=Exported

Enable Option to export Large Sheet counter 0=No export MFPRINTLargeSheetsDisplayable 605 12 0 0 1
information to clients 1=Exported

Maximum time allowed for ESS to resync Disturbance time 605 13 12 0 240
before deleting orphaned print jobs

Enable Option to export Colour images 0=No export MFPRINTMarkedColorImagesDisplay 605 16 1 0 1

counter information to clients 1=Exported

Enable Option to export Colour Sheet 0=No export MFPRINTColorSheetsDisplay 605 17 0 0 1

counter information to clients 1=Exported

Enable Option to export Duplex Colour 0=No export MFPRINTDuplexColorSheetsDisplay 605 18 0 0 1

Sheet counter information to clients 1=Exported

Enable Option to export Large Colour Sheet 0=No export MFPRINTLargeColorSheetsDisplay 605 19 0 0 1
counter information to clients 1=Exported

Counter MFPSuccessImgRecServerFaxDisplay 605 20 1 0 1

Enable Option to export Large Success Ifax 0=No export MFPSuccessIFaxImagesRecDisplay 605 21 1 0 1
images counter information to clients 1=Exported

PrintJobReleaseThreshold PrintJobReleaseThreshold 605 28 2 1 4

Black reprint image counter displayable Usage Counter BlackReprintImagesDisp 605 36 0 0 1

Color reprint image counter displayable Usage Counter ColorReprintImagesDisp 605 38 0 0 1

WorkCentre 6400 Service Manual A-103

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 1 Media Type MTStandard = 0, Tray 1 Media Type 606 1 0 0 102

MTDrilled = 1,
MTEnvelope = 3,
MTTransparency = 4,
MTLetterhead = 5,
MTLabels = 6,
MTRecycled = 7,
MTOtherType = 9,
MTBond = 12,
MTPrePrinted = 13,
MTCardStock = 14,
MTCustom1 = 15,
MTCustom2 = 16,
MTCustom3 = 17,
MTCustom4 = 19,
MTCustom5 = 20,
MTCustom6 = 21,
MTCustom7 = 22,
MTUnspecified = 18,
MTSystemDefault = 23,
MTPrecutTabs = 37,
MTCovers = 38,
MTTabs = 39,
MTPaperBackedTransparency =
40,
MTThin = 41,
MTLightCardStock = 42,
MTLightGlossy = 43,
MTHeavyGlossy = 44,
MTLightCardStockSide2 = 45,
MTLightGlossySide2 = 46,
MTHeavyGlossySide2 = 47,
MTCardStockSide2 = 48,
MTThinSide2 = 49,
MTHeavyLabels = 50,
MTHeavyPrecutTabs = 51,
MTHeavyCardStock = 52,
MTHeavyCardStockSide2 = 53,
MTExtraHeavyGlossy = 54,
MTExtraHeavyGlossySide2 = 55,
MTExtraHeavyLabels = 56,
MTUsedStandard = 57,
MTRoughStock = 58,
MTPhoto = 59,
MTPostcard = 60

Tray 1 Media Color MCWhite = 0, Tray 1 Media Color 606 2 0 0 34

MCGreen = 1,
MCBuff = 2,
MCYellow = 3,
MCGoldenrod = 4,
MCBlue = 5,
MCPink = 6,
MCTransparent = 7,
MCIvory = 8,
MCGray = 9,
MCRed = 10,
MCOrange = 11,
MCOtherColor = 12,
MCCustom1 = 13,
MCCustom2 = 14,
MCCustom3 = 15,
MCCustom4 = 17,
MCCustom5 = 18,
MCCustom6 = 19,
MCCustom7 = 20,
MCUnspecified = 16,
MCSystemDefault = 21

Tray 1 Media Weight Tray 1 Media Weight 606 3 75 56 203

Tray 1 Direct Select TSDirectOnly = 0, Tray 1 Direct Select 606 4 1 0 1

TSDirectAndAuto = 1

Tray 1 Priority Tray 1 Priority 606 5 50 1 99

Tray 1 Width Range and default size in mm Tray 1 Width 606 6 279 148 356

A-104 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 1 Length Range and default size in mm Tray 1 Length 606 7 216 92 216

Tray 1 Percent Full Tray 1 Percent Full 606 8 0 0 100

Tray 1 User Type TAFixed = 0, Tray 1 User Type 606 9 1 0 1

TAAdjustableAll = 1,
-----------------------------
[TAAdjustableSizeOnly = 2]

Tray 1 Modulus Tray 1 Modulus 606 10 0 0 100

Tray 1 Modulus Position Tray 1 Modulus Position 606 11 1 1 100

Tray 2 Media Type MTStandard = 0, Tray 2 Media Type 606 21 0 0 102

WorkCentre 6400 Service Manual A-105

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 2 Media Color MCWhite = 0, Tray 2 Media Color 606 22 0 0 34

Tray 2 Media Weight Tray 2 Media Weight 606 23 75 56 203

Tray 2 Direct Select TSDirectOnly = 0, Tray 2 Direct Select 606 24 1 0 1

TSDirectAndAuto = 1

Tray 2 Priority Tray 2 Priority 606 25 10 1 99

Tray 2 Width Range and default size in mm Tray 2 Width 606 26 279 279 297

Tray 2 Length Range and default size in mm Tray 2 Length 606 27 216 210 216

Tray 2 Percent Full Tray 2 Percent Full 606 28 0 0 100

Tray 2 User Type TAFixed = 0, Tray 2 User Type 606 29 1 0 1

TAAdjustableAll = 1,
-----------------------------
[TAAdjustableSizeOnly = 2]

Tray 2 Modulus Tray 2 Modulus 606 30 0 0 100

Tray 2 Modulus Position Tray 2 Modulus Position 606 31 1 1 100

A-106 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 3 Media Type MTStandard = 0, Tray 3 Media Type 606 41 0 0 102

Tray 3 Media Color MCWhite = 0, Tray 3 Media Color 606 42 0 0 34

Tray 3 Media Weight Tray 3 Media Weight 606 43 75 56 203

Tray 3 Direct Select TSDirectOnly = 0, Tray 3 Direct Select 606 44 1 0 1

TSDirectAndAuto = 1

Tray 3 Priority Tray 3 Priority 606 45 20 1 99

Tray 3 Width Range and default size in mm Tray 3 Width 606 46 279 257 356

WorkCentre 6400 Service Manual A-107

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 3 Length Range and default size in mm Tray 3 Length 606 47 216 182 216

Tray 3 Percent Full Tray 3 Percent Full 606 48 0 0 100

Tray 3 User Type 0 = TAFixed Tray 3 User Type 606 49 1 0 1

1 = TAAdjustableAll

Tray 3 Modulus Tray 3 Modulus 606 50 0 0 100

Tray 3 Modulus Position Tray 3 Modulus Position 606 51 1 1 100

Tray 4 Media Type MTStandard = 0, Tray 4 Media Type 606 61 0 0 102

A-108 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Tray 4 Media Color MCWhite = 0, Tray 4 Media Color 606 62 0 0 34

Tray 4 Media Weight Tray 4 Media Weight 606 63 75 56 203

Tray 4 Direct Select TSDirectOnly = 0, Tray 4 Direct Select 606 64 1 0 1

TSDirectAndAuto = 1

Tray 4 Priority Tray 4 Priority 606 65 30 1 99

Tray 4 Width Range and default size in mm Tray 4 Width 606 66 279 257 356

Tray 4 Length Range and default size in mm Tray 4 Length 606 67 216 182 216

Tray 4 Percent Full Tray 4 Percent Full 606 68 0 0 100

Tray 4 User Type 0 = TAFixed Tray 4 User Type 606 69 1 0 1

1 = TAAdjustableAll

Tray 4 Modulus Tray 4 Modulus 606 70 0 0 100

Tray 4 Modulus Position Tray 4 Modulus Position 606 71 1 1 100

Billing Configuration Defines machine billing TB Configuration 606 272 0 0 2

This counter supports tier billing configuration.
BCtraditional = 0;
BC2tier = 1;
BC3tier = 2;

Default sheet edge erase value for pre- The units are in millimeters (mm) PrePunchMediaEraseValue 606 392 0 0 255
punched, pre-cut tab stock. Please refer FS
16.020 for more details related to this
feature.

Fuser Assy - Number of sheets system increments counter FuserUsage 606 489 0 0 4.29E+09

Transfer Roller - Number of impressions system increments counter XferRollerUsage 606 490 0 0 4.29E+09

Transfer Belt - Number of impressions system increments counter XferBeltUsage 606 491 0 0 4.29E+09

Fuser Life Expectancy Modifiable via DC131 FuserLife 606 523 0 0 4.29E+09

Transfer Roller Life Expectancy Modifiable via DC131 XferRollLife 606 524 0 0 4.29E+09

Transfer Belt Life Expectancy Modifiable via DC131 XferBeltLife 606 525 0 0 4.29E+09

Inhibit Mark On Tabs Policy 0=Off, 1=On InhibitMarkOnTabsPolicy 606 540 0 0 1

Fault Counter 09-001: LaserUnitFailFC No. of faults LaserUnitFailFC 606 555 0 0 255

Fault Counter 09-002: No. of faults LaserUnitPolygonMotorFailFC 606 556 0 0 255

LaserUnitPolygonMotorFailFC

Fault Counter 08-001: No. of faults Feeder1XferRollerContactFailFC 606 557 0 0 255

Feeder1XferRollerContactFailFC

Fault Counter 08-002: No. of faults Feeder2XferRollerContactFailFC 606 558 0 0 255

Feeder2XferRollerContactFailFC

Fault Counter 10-301: No. of faults FuserWarmTimeThermalFailFC 606 559 0 0 255

FuserWarmTimeThermalFailFC

WorkCentre 6400 Service Manual A-109

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Fault Counter 10-302: No. of faults FuserWarmTimePressureFailFC 606 560 0 0 255

FuserWarmTimePressureFailFC

Fault Counter 10-303: No. of faults FuserTempLowThermalFC 606 561 0 0 255

FuserTempLowThermalFC

Fault Counter 10-304: No. of faults FuserTempLowPressureFC 606 562 0 0 255

FuserTempLowPressureFC

Fault Counter 10-305: No. of faults FuserTempHighThermalFC 606 563 0 0 255

FuserTempHighThermalFC

Fault Counter 10-306: No. of faults FuserTempHighPressureFC 606 564 0 0 255

FuserTempHighPressureFC

Fault Counter 10-307: FuserFanFailFC No. of faults FuserFanFailFC 606 565 0 0 255

Fault Counter 10-308: FuserMotorFailFC No. of faults FuserMotorFailFC 606 566 0 0 255

Fault Counter 04-001: OzoneFan FailFC No. of faults OzoneFan FailFC 606 567 0 0 255

Fault Counter 04-002: PowerFanFailFC No. of faults PowerFanFailFC 606 568 0 0 255

Fault Counter 04-003: FinisherFanFailFC No. of faults FinisherFanFailFC 606 569 0 0 255

Fault Counter 03-301: No. of faults EngineFlashROMWriteFailFC 606 570 0 0 255

EngineFlashROMWriteFailFC

Fault Counter 03-302: No. of faults EngineFlashROMDeviceFailFC 606 571 0 0 255

EngineFlashROMDeviceFailFC

Fault Counter 12-098: No. of faults FinisherFlashROMFailFC 606 572 0 0 255

FinisherFlashROMFailFC

Fault Counter 12-099: No. of faults FinisherCommErrorFC 606 573 0 0 255

FinisherCommErrorFC

Fault Counter 03-303: No. of faults EngineFirmwareFailFC 606 574 0 0 255

EngineFirmwareFailFC

Fault Counter 03-304: HardDiskFailFC No. of faults HardDiskFailFC 606 575 0 0 255

Fault Counter 03-305: EngineNVRAMFail1FC No. of faults EngineNVRAMFail1FC 606 576 0 0 255

Fault Counter 03-308: EngineNVRAMFail2FC No. of faults EngineNVRAMFail2FC 606 577 0 0 255

Fault Counter 12-480: No. of faults FinisherElevationDriveFailFC 606 578 0 0 255

FinisherElevationDriveFailFC

Fault Counter 12-481: No. of faults FinisherPaperPressDriveFailFC 606 579 0 0 255

FinisherPaperPressDriveFailFC

Fault Counter 12-482: No. of faults FinisherAlignPlateDriveFailFC 606 580 0 0 255

FinisherAlignPlateDriveFailFC

Fault Counter 12-483: No. of faults FinisherEjectRollerContactFailFC 606 581 0 0 255

FinisherEjectRollerContactFailFC

Fault Counter 12-484: No. of faults FinisherStorageBeltContactFailFC 606 582 0 0 255

FinisherStorageBeltContactFailFC

Fault Counter 12-485: No. of faults FinisherBundleEjectMotorFailFC 606 583 0 0 255

FinisherBundleEjectMotorFailFC

Fault Counter 09-003: No. of faults BlackDeveloperMotorFailFC 606 584 0 0 255

BlackDeveloperMotorFailFC

Fault Counter 09-004: No. of faults ColorDeveloperMotorFailFC 606 585 0 0 255

ColorDeveloperMotorFailFC

Fault Counter 09-005: No. of faults ColorPrintCartridgeMotorFailFC 606 586 0 0 255

ColorPrintCartridgeMotorFailFC

Fault Counter 09-006: No. of faults XferBlkPrintCartridgeMotorFailFC 606 587 0 0 255

XferBlkPrintCartridgeMotorFailFC

Fault Counter 09-007: CyanSensorErrorFC No. of faults CyanSensorErrorFC 606 588 0 0 255

Fault Counter 09-008: No. of faults MagentaSensorErrorFC 606 589 0 0 255

MagentaSensorErrorFC

A-110 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Fault Counter 09-009: YellowSensorErrorFC No. of faults YellowSensorErrorFC 606 590 0 0 255

Fault Counter 09-010: BlackSensorErrorFC No. of faults BlackSensorErrorFC 606 591 0 0 255

Fault Counter 03-310: No. of faults UnknownPrinterErrorFC 606 592 0 0 255

UnknownPrinterErrorFC

Fault Counter 10-106: JamAtFuserFC No. of faults JamAtFuserFC 606 593 0 0 255

Fault Counter 08-105: JamAtDuplexFC No. of faults JamAtDuplexFC 606 594 0 0 255

Fault Counter 08-101: JamAtTray1MPTFC No. of faults JamAtTray1MPTFC 606 595 0 0 255

Fault Counter 08-102: No. of faults JamRightDoorFeedCassetteTray2FC 606 596 0 0 255

JamRightDoorFeedCassetteTray2FC

Fault Counter 08-103: No. of faults JamPaperTransFeedCassetteTray3FC 606 597 0 0 255

JamPaperTransFeedCassetteTray3FC

Fault Counter 08-104: No. of faults JamPaperTransFeedCassetteTray4FC 606 598 0 0 255

JamPaperTransFeedCassetteTray4FC

Fault Counter 10-105: No. of faults JamAtVerticalTransportAreaFC 606 599 0 0 255

JamAtVerticalTransportAreaFC

Fault Counter 10-102: No. of faults JamAtHorizontalTransferDoorFC 606 600 0 0 255

JamAtHorizontalTransferDoorFC

Fault Counter 04-486: No. of faults JamAtOutputTrayNoFinisherFC 606 601 0 0 255

JamAtOutputTrayNoFinisherFC

Fault Counter 10-103: No. of faults Jam2ndImageTransferRollerFC 606 602 0 0 255

Jam2ndImageTransferRollerFC

Fault Counter 10-104: JamReFeedingAreaFC No. of faults JamReFeedingAreaFC 606 603 0 0 255

Fault Counter 12-487: No. of faults JamFinisherTransportAreaFC 606 604 0 0 255

JamFinisherTransportAreaFC

Fault Counter 12-488: No. of faults JamFinisherUpperOutputTrayFC 606 605 0 0 255

JamFinisherUpperOutputTrayFC

Fault Counter 12-489: No. of faults JamFinisherStackerOutputTrayFC 606 606 0 0 255

JamFinisherStackerOutputTrayFC

Fault Counter 12-491: StaplerJamFC No. of faults StaplerJamFC 606 607 0 0 255

Have image registration settings been setup ImageRegSettingsAreSetup 606 716 0 0 1

Have media calibration settings been setup MediaCalSettingsAreSetup 606 717 0 0 1

Default is the version number of the Excel Table Version used to create the FS23.201 Table Version 606 787 1198 0 65535
table used to create the NVM NVM ie V1.234 = 1234

Number of Grams of toner in a Standard Grams TonerGramsStd 606 820 125 0 65535
size cartridge

Number of Grams of toner in a High Grams TonerGramsHiCap 606 821 250 0 65535
Capacity cartridge

Background detection window fast scan Copy ABS Detect Window FS Start 610 1 75 0 1000
start, defined in tenth of percentage point of
document fast scan dimension. Values from
0 to 1000 (e.g. 1% is 10, 10% is 100, 100%
is 1000).

Background detection window fast scan Copy ABS Detect Window FS Size 610 2 850 0 1000
dimension, defined in tenth of percentage
point of document fast scan dimension.
Values from 0 to 1000 (e.g. 1% is 10, 10%
is 100, 100% is 1000).

Auto Background Suppression level for Copy ABS Level Platen 610 3 2 0 4
platen

Auto Background Suppression level for Copy ABS Level DADH 610 4 2 0 4
DADH

Auto Contrast level for platen Copy Auto Contrast Level Platen 610 5 2 0 4

Auto Contrast level for DADH Copy Auto Contrast Level DADH 610 6 2 0 4

WorkCentre 6400 Service Manual A-111

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Auto Color detection window fast scan start, Copy Auto Color Detect FS Start 610 7 64 0 1000
defined in tenth of percentage point of
document fast scan dimension. Values from
0 to 1000 (e.g. 1% is 10, 10% is 100, 100%
is 1000).

Auto Color detection window slow scan Copy Auto Color Detect SS Start 610 8 64 0 1000
start, defined in tenth of percentage point of
document slow scan dimension. Values
from 0 to 1000 (e.g. 1% is 10, 10% is 100,
100% is 1000).

Auto Color Detection Level for platen at pixel Copy Auto Color Level Pixel Plat 610 9 2 0 4
level. Defines a value that dictates how
chromatic a pixel has to be in order to be
considered color

Auto Color Detection Level for platen at Copy Auto Color Level Page Plat 610 10 2 0 4
page level. Defines a value that dictates how
chromatic a pixel has to be in order to be
considered color

Auto Color Detection Level for DADH at pixel Copy Auto Color Level Pixel DADH 610 11 2 0 4
level. Defines a value that dictates how
many color pixels have to be on a page so
that the document is considered color

Auto Color Detection Level for DADH at Copy Auto Color Level Page DADH 610 12 2 0 4
page level. Defines a value that dictates how
many color pixels have to be on a page so
that the document is considered color

Dictates if black & white copies are printed Default specific for WorkCentre K only (only black ink for B&W) 610 13 1 0 1
in K-only or composite black 6400 only

Photo/Text Segmentation Threshold will Copy Photo/Text Segmentat'n Ctrl 610 14 2 0 4

control the Galileo segmentation. When it
changes, the part of the input that will be
considered text will vary as well as the part
that will be considered photo.

Defines the type of paper used Copy White Reference 610 15 0 0 127

Defines the binary vs. contone image path/ Copy Im Path Type (bit depth) 610 16 8 1 16
printing

Background detection window fast scan Scan ABS Detect Window FS Start 610 17 75 0 1000
start, defined in tenth of percentage point of
document fast scan dimension. Values from
0 to 1000 (e.g. 1% is 10, 10% is 100, 100%
is 1000).

Background detection window fast scan Scan ABS Detect Window FS Size 610 18 850 0 1000
dimension, defined in tenth of percentage
point of document fast scan dimension.
Values from 0 to 1000 (e.g. 1% is 10, 10%
is 100, 100% is 1000).

Auto Background Suppression level for Scan ABS Level Platen 610 19 2 0 4
platen

Auto Background Suppression level for Scan ABS Level DADH 610 20 2 0 4
DADH

Auto Contrast level for platen Scan Auto Contrast Level Platen 610 21 2 0 4

Auto Contrast level for DADH Scan Auto Contrast Level DADH 610 22 2 0 4

Auto Color detection window fast scan start, Scan Auto Color Detect FS Start 610 23 64 0 1000
defined in tenth of percentage point of
document fast scan dimension. Values from
0 to 1000 (e.g. 1% is 10, 10% is 100, 100%
is 1000).

Auto Color detection window slow scan Scan Auto Color Detect SS Start 610 24 64 0 1000
start, defined in tenth of percentage point of
document slow scan dimension. Values
from 0 to 1000 (e.g. 1% is 10, 10% is 100,
100% is 1000).

A-112 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Auto Color Detection Level for platen at pixel Scan Auto Color Level Pixel Plat 610 25 2 0 4
level. Defines a value that dictates how
chromatic a pixel has to be in order to be
considered color

Auto Color Detection Level for platen at Scan Auto Color Level Page Plat 610 26 2 0 4
page level. Defines a value that dictates how
many color pixels have to be on a page so
that the document is considered color

Auto Color Detection Level for DADH at pixel Scan Auto Color Level Pixel DADH 610 27 2 0 4
level. Defines a value that dictates how
chromatic a pixel has to be in order to be
considered color

Auto Color Detection Level for DADH at Scan Auto Color Level Page DADH 610 28 2 0 4
page level. Defines a value that dictates how
many color pixels have to be on a page so
that the document is considered color

Photo/Text Segmentation Threshold will Scan Photo/Text Segmentat'n Ctrl 610 29 2 0 4

control the Galileo segmentation. When it
changes, the part of the input that will be
considered text will vary as well as the part
that will be considered photo.

Defines the type of paper used (4024, 4200, Scan White Reference 610 30 0 0 127
Xpressions, recyclable, etc)

Background detection window fast scan Fax ABS Detect Window FS Start 610 31 75 0 1000
start, defined in tenth of percentage point of
document fast scan dimension. Values from
0 to 1000 (e.g. 1% is 10, 10% is 100, 100%
is 1000).

Background detection window fast scan Fax ABS Detect Window FS Size 610 32 850 0 1000
dimension, defined in tenth of percentage
point of document fast scan dimension.
Values from 0 to 1000 (e.g. 1% is 10, 10%
is 100, 100% is 1000).

Auto Background Suppression level for Fax ABS Level Platen 610 33 2 0 4
platen

Auto Background Suppression level for Fax ABS Level DADH 610 34 2 0 4
DADH

Auto Contrast level for platen Fax Auto Contrast Level Platen 610 35 2 0 4

Auto Contrast level for DADH Fax Auto Contrast Level DADH 610 36 2 0 4

Photo/Text Segmentation Threshold will Fax Photo/Text Segment'n Control 610 37 2 0 4

control the Galileo segmentation. When it
changes, the part of the input that will be
considered text will vary as well as the part
that will be considered photo.

Defines the type of paper used Fax White Reference 610 38 0 0 127

Defines the binary vs. contone image path/ 1 to 16 Print ImagePath Type (bit depth) 610 47 8 1 16
printing

Fault Counter 22-330-02: Queue To Queue To NC Print TimeoutFC 612 1 0 0 255

ESSPrint Timeout

Fault Counter 22-330-03: Queue To S2F Queue To S2F Timeout 612 2 0 0 255
Timeout

Fault Counter 22-330-04: Queue To FaxSend Queue To FaxSend Timeout 612 3 0 0 255
Timeout

Fault Counter 22-330-05: Queue To DCCopy Queue To DCCopy Timeout 612 4 0 0 255
Timeout

Fault Counter 22-330-06: Queue To S2Distr Queue To S2Distr Timeout 612 5 0 0 255
Timeout

WorkCentre 6400 Service Manual A-113

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Defines market region Market Region settings: Market Region 616 1 0 0 7

0=US (North America)
1=XCL(Canada)
2=FX (Fuji Xerox Japan)
3=FXAPO (Fuji Xerox Asian
Pacific)
4=ACO(Latin)
5=RX(Europe)
6=MRDmoEast
7=MRDmoWest

Enable Power Saver feature 0=Disabled Power saver enabled 616 2 1 0 1

1=Enabled

WC6400 Famly- Defines Product 115 = 32/37 Standard Product Configuration 616 3 115 115 117
Configuration 116 = 32/37 with Option set
117 = 32/37 with Option set,
finisher and 2-tray module

Defines System Configuration (type of 0 = Unknown (Not set) System Configuration 616 4 1 0 8
system) 1 = ST (Networked)
8 = Network Suppressed

Defines start day of daylight savings time DST Start 616 5 0 0 366

Defines end day of daylight savings time DST End 616 6 0 0 366

Defines time display format Time Display Format 616 7 0 0 1

0=12 hour format, 1=24 hour format

Determines whether power saver's power Power off enabled 616 8 1 0 1

off option is enabled. 0=False, 1=True

Determines whether power saver's power Power off timeout enabled 616 9 1 0 1
off option using timers is enabled.
0=False, 1=True

Power saver idletime 616 10 15 1 225

Defines time in "mode 1" before Power saver in mode time 616 11 90 0 255
transitioning to "mode 3" for appropriate
configurations.

Defines time in "lowest" power saver mode Power saver power off time 616 12 45 0 255
before powering off.

Defines date display format Date Display Format 616 13 0 0 3

0=mm/dd/yy, 1=dd/mm/yy, 3=yy/mm/dd

Defines system's current installation phase. System install phase 616 14 2 0 4

Defines reason for previous power off. Power up reason 616 16 1 0 3

Defines the order algorithm for queues/ Contention Algorithm 616 17 1 0 1

contention: FIFO vs. priority

Amount of additional time after power up Extra Time 616 18 5 0 5

before system can enter power saver.

Defines system's overall mode System mode 616 19 0 0 11

Determines if the system runs through auto Auto configuration enabled 616 20 1 0 1
configuration, detect at power on.
0=False, 1=True

Defines system line voltage 0=Unknown, Line voltage 616 21 2 0 3

1=100V, 2=115V, 3=230V

Defines system line frequency Line frequency 616 22 1 0 1

0=50Hz, 1=60Hz

Determines whether serial number has been Serial number enabled 616 24 1 0 1
set. 0=False, 1=True

Defines time interval for increasing job's Promotion time 616 25 120 15 1440
priority based on time in system.

Determines whether to increase job priority Auto promotion enabled 616 26 1 0 1

longer job is in system. 0=False, 1=True

A-114 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Defines previous market region 0=USCO, Previous market region 616 27 0 0 5

1=XCL, 2=FX, 3=FXAPO, 4=ACO, 5=RX

Defines client who did the most recent modeChangeClientId 616 28 16 0 9994
system mode change.

Defines last day that an end of day was Latest EOD event 616 29 0 0 4.29E+09
reached.

Defines previous product configuration (All Previous product config 616 30 106 0 114
Products)

Defines previous line frequency Previous line frequency 616 31 1 0 1

0=50Hz, 1=60Hz

Defines previous line voltage Previous line voltage 616 32 2 0 3

0=Unknown, 1=100V, 2=115V, 3=230V

List of system's copyright years. NVM copyright years 616 33 0 0 4.29E+09

Defines current client of system installation. Desired install client 616 34 0 0 255

Determines whether remote intrusive remoteIntrusiveDiagEnabled 616 35 1 0 1

diagnostics is enabled. 0=False, 1=True

Defines installation's value added reseller. Value added reseller 616 36 255 0 255

Used by platforms to insure system clocks GMT Offset 616 37 0 - 50400

are set to correct time zones. 4320
0

Determines whether ESS is On (Off) line. NC OnlineNvm 616 38 1 0 1

0=False, 1=True

Max time a job can be held before it is Job Hold Time 616 39 4320 0 7200
deleted by the system

SA/KO setting to enable/disable hold job Job Hold Timer enabled 616 40 1 0 1
timer

Counter used for secure install and remove ScanToFileinstalled count 616 41 0 0 65535
operations of the optional features

Counter used for secure install and remove LanFaxinstalled count 616 42 0 0 65535
operations of the optional features

Counter used for secure install and remove JBAinstalled count 616 43 0 0 65535
operations of the optional features

ScanToFileenabled 616 44 0 0 1

Specifies whether Lan Fax is Enabled on the LanFaxenabled 616 45 0 0 1

machine.

Specifies whether JBA is allowed to be JBAenabled 616 46 0 0 1

turned Enabled on the machine.

Used by PWS to determine if ESS terminal NC TTY enabled 616 47 0 0 1

window is enabled

NC Config - Type 616 48 42 0 99

NC Config - Option 616 49 42 0 99

NC Config - Storage 616 50 42 0 99

NC Config - Software Options 616 51 42 0 99

Product Identifier (e.g. Marketing product 0 = Unknown (Not set) Product Identifier 616 52 0 0 255
name) WorkCentre6400 145 to 147
145 = 6400S
146 = 6400X
147 = 6400XF

HeapLimits F:max images T:max jobs HeapLimits F:MaxImages T:MaxJobs 616 53 0 0 1

InternetFaxinstalled count 616 54 0 0 65535

ScanToEmailinstalled count 616 55 0 0 65535

InternetFaxenabled 616 56 0 0 1

WorkCentre 6400 Service Manual A-115

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

ScanToEmailenabled 616 57 0 0 1

Software Upgrade Status 616 58 0 0 7

Declassify system - operation status DeclassifySystemOperationStatus 616 59 0 0 5

Declassify system - retry count 616 60 0 0 255

Declassify system - client id 616 61 0 0 255

Declassif system - platform mask DeclassifySystemPlatformMask 616 62 0 0 65535

Declassif system - pattern list length Declassify system-pattern length 616 65 0 0 255

Declassif system - number of repititions Declassify system # repetitions 616 66 0 0 255

Declassif system - number of retries Declassify system - # of retries 616 67 0 0 255

Declassif system - number of retries Declassify system - Timeout 616 68 0 0 4.29E+09

DiskOverwriteinstalled count 616 69 0 0 65535

DiskOverwriteenabled 616 70 0 0 1

ScanToFilehwsw available 616 71 1 0 1

ScanToFileinstalled 616 72 0 0 1

LanFaxhwsw available 616 73 1 0 1

LanFaxinstalled 616 74 0 0 1

JBAhwsw available 616 75 1 0 1

JBAinstalled 616 76 0 0 1

ScanToEmailhwsw available 616 77 1 0 1

ScanToEmailinstalled 616 78 0 0 1

InternetFaxhwsw available 616 79 1 0 1

InternetFaxinstalled 616 80 0 0 1

DiskOverwritehwsw available 616 81 1 0 1

DiskOverwriteinstalled 616 82 0 0 1

JobOverwritehwsw available 616 83 1 0 1

JobOverwriteinstalled 616 84 0 0 1

JobOverwriteinstalled count 616 85 0 0 65535

JobOverwriteenabled 616 86 0 0 1

EmbeddedFaxhwsw available 616 87 1 0 1

EmbeddedFaxinstalled 616 88 0 0 1

EmbeddedFaxinstalled count 616 89 0 0 65535

EmbeddedFaxenabled 616 90 0 0 1

Heavy Weight Fuser Enabled 616 91 1 0 1

Auto upgrade enable Software upgrade monitor enabled 616 92 0 0 1

Geographic Region 0=Unspecified, Geographic region 616 94 0 0 3

1= Eastern,
2= Western,
3= Not Applicable
A setting of 3 (GRNotApplicable)
indicates the CRU's are not to be
differentiated by geoRegion, but
by ServicePlan

SIM data mirror Zone1Page1Byte0 616 95 0 0 255

SIM data mirror Zone1Page1Byte1 616 96 0 0 255

SIM data mirror Zone1Page1Byte2 616 97 0 0 255

A-116 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

SIM data mirror Zone1Page1Byte3 616 98 0 0 255

SIM data mirror Zone1Page1Byte4 616 99 0 0 255

SIM data mirror Zone1Page1Byte5 616 100 0 0 255

SIM data mirror Zone1Page1Byte6 616 101 0 0 255

SIM data mirror Zone1Page2Byte0 616 102 0 0 255

SIM data mirror Zone1Page2Byte1 616 103 0 0 255

SIM data mirror Zone1Page2Byte2 616 104 0 0 255

SIM data mirror Zone1Page2Byte3 616 105 0 0 255

SIM data mirror Zone1Page2Byte4 616 106 0 0 255

SIM data mirror Zone1Page2Byte5 616 107 0 0 255

SIM data mirror Zone1Page2Byte6 616 108 0 0 255

SIM data mirror Zone1Page3Byte0 616 109 0 0 255

SIM data mirror Zone1Page3Byte1 616 110 0 0 255

SIM data mirror Zone1Page3Byte2 616 111 0 0 255

SIM data mirror Zone1Page3Byte3 616 112 0 0 255

SIM data mirror Zone1Page3Byte4 616 113 0 0 255

SIM data mirror Zone1Page3Byte5 616 114 0 0 255

SIM data mirror Zone1Page3Byte6 616 115 0 0 255

SWUP NVM Save Switch SWUP NVM Save Switch 616 116 0 0 255

Delete settings Delete settings 616 117 0 0 1

EssOnlineValidNvm NC OnlineValidNvm 616 118 0 0 1

SearchPDFhwsw available SearchPDFhwsw available 616 120 1 0 1

SearchPDFinstalled SearchPDFinstalled 616 121 0 0 1

SearchPDFinstalled count SearchPDFinstalled count 616 122 0 0 65535

SearchPDFenabled SearchPDFenabled 616 123 0 0 1

Cpsrhwsw available Cpsrhwsw available 616 124 1 0 1

Cpsrinstalled Cpsrinstalled 616 125 0 0 1

Cpsrinstalled count Cpsrinstalled count 616 126 0 0 65535

Cpsrenabled Cpsrenabled 616 127 0 0 1

Fast Resume status 0 = Disabled Fast Resume status 616 143 0 0 1

1 = Enabled

Power Management mode 0 = intelligent ready Power Management mode 616 144 1 0 2
1 = job activated
2 = scheduled

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Sunday 616 145 9 0 23
Sunday increments), default is 9

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Monday 616 146 9 0 23
Monday increments), default is 9

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Tuesday 616 147 9 0 23
Tuesday increments), default is 9

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Wednesday 616 148 9 0 23
Wednesday increments), default is 9

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Thursday 616 149 9 0 23
Thursday increments), default is 9

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Friday 616 150 9 0 23
Friday increments), default is 9

WorkCentre 6400 Service Manual A-117

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Power Management Scheduled wake time - 0=00hrs --> 23 = 23hrs (hourly Scheduled wake time - Saturday 616 151 9 0 23
Saturday increments), default is 9

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Sunday 616 152 17 0 23
time - Sunday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Monday 616 153 17 0 23
time - Monday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Tuesday 616 154 17 0 23
time - Tuesday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Wed. 616 155 17 0 23
time - Wednesday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Thurs. 616 156 17 0 23
time - Thursday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Friday 616 157 17 0 23
time - Friday increments), Default is 17

Power Management Scheduled power saver 0=00hrs --> 23 = 23hrs (hourly Scheduled pwr saver time Sat. 616 158 17 0 23
time - Saturday increments), Default is 17

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Sunday 616 159 0 0 1
Sunday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Monday 616 160 0 0 1
Monday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Tuesday 616 161 0 0 1
Tuesday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Wednesday 616 162 0 0 1
Wednesday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Thursday 616 163 0 0 1
Thursday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Friday 616 164 0 0 1
Friday 1 = Specified time

Power Management daily Schedule type - 0 = Job Activated (default), Schedule type - Saturday 616 165 0 0 1
Saturday 1 = Specified time

Fault Counter 22-330: number of times page No. of faults NumTimesPagePackPinlockedFC 616 200 0 0 255
pack pin has been locked out

Disk Encryption - hwsw available Indicates if the appropriate Disk Encryption - hwsw available 616 203 1 0 1
hardware is available

Disk Encryption - Installed Indicates if Disk Encryption Disk Encryption - Installed 616 204 1 0 1
option is installed

Disk Encryption - Installed Count Disk Encryption Installed Count 616 205 0 0 65535

Disk Encryption enabled/disabled 0 = disabled Disk Encryption Enabled/Disabled 616 206 0 0 1

1 = enabled

Fast Resume popup message enabled status 0= Fast Resume feature not Fast Resume popup enabled status 616 212 0 0 1
previously enabled
1= Fast Resume feature has been
previously enabled

Defines system manager full ODIO timeout 90 minutes FullODIOTimeout 616 213 90 0 255

Defines system manager standard ODIO 30 minutes StandardODIOTimeout 616 214 30 0 255
timeout

Automatic System Reset Count 0~2 Auto-Reset Count 616 216 0 0 2

Faults displayed on TTY 617 2 1 0 1

Display faults 617 3 1 0 1

IISS Version No Upper Level 620 1 0 0 65535

prescanType 620 2 0 0 1

photoTextSeparationLevel 620 3 2 0 4

A-118 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

photoReproLevel 620 4 1 0 2

bwSeparationLevel 620 5 2 0 4

RED chromaticValueLow 620 6 0 0 65535

RED chromaticValueHigh 620 7 25700 0 65535

RED aChromaticValueLow 620 8 0 0 65535

RED aChromaticValueHigh 620 9 0 0 65535

GRN chromaticValueLow 620 10 25600 0 65535

GRN chromaticValueHigh 620 11 25600 0 65535

GRN aChromaticValueLow 620 12 0 0 65535

GRN aChromaticValueHigh 620 13 0 0 65535

BLU chromaticValueLow 620 14 25600 0 65535

BLU chromaticValueHigh 620 15 63 0 65535

BLU aChromaticValueLow 620 16 0 0 65535

BLU aChromaticValueHigh 620 17 0 0 65535

YEL chromaticValueLow 620 18 0 0 65535

YEL chromaticValueHigh 620 19 25600 0 65535

YEL aChromaticValueLow 620 20 0 0 65535

YEL aChromaticValueHigh 620 21 0 0 65535

MAG chromaticValueLow 620 22 0 0 65535

MAG chromaticValueHigh 620 23 100 0 65535

MAG aChromaticValueLow 620 24 0 0 65535

MAG aChromaticValueHigh 620 25 0 0 65535

CYA chromaticValueLow 620 26 25600 0 65535

CYA chromaticValueHigh 620 27 0 0 65535

CYA aChromaticValueLow 620 28 0 0 65535

CYA aChromaticValueHigh 620 29 0 0 65535

BLA chromaticValueLow 620 30 100 0 65535

BLA chromaticValueHigh 620 31 0 0 65535

BLA aChromaticValueLow 620 32 0 0 65535

BLA aChromaticValueHigh 620 33 0 0 65535

Fault Counter 05-194: 05-194 counter 620 70 0 0 255

Fault Counter 05-196: 05-196 counter 620 72 0 0 255

Fault Counter 05-197: 05-197 counter 620 73 0 0 255

Fault Counter 62-310: 62-310 counter 620 99 0 0 255

Market Information 620 101 0 0 3

IISS Major Version 620 102 0 0 65535

IISS Minor Version 620 103 0 0 65535

IISS Revision Version 620 104 0 0 65535

IISS Patch Version 620 105 0 0 65535

ADF Major Version 620 106 0 0 65535

ADF Minor Version 620 107 0 0 65535

ADF Revision Version 620 108 0 0 65535

WorkCentre 6400 Service Manual A-119

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

ADF Patch Version 620 109 0 0 65535

IPL Version 620 110 0 0 65535

IIT fail bypass 620 111 0 0 1

Fan control mode 620 112 0 0 1

The number of APS sensors 620 113 1 0 1

Lamp Fan fal bypass 620 114 0 0 1

Lamp Fan Low rotation ON time 620 115 15 0 60

Lamp Fan Off time 620 116 0 0 60

FL timer set 620 117 0 0 1

Lamp On interval 620 118 30 0 60

Lamp On time 620 119 1 0 60

IIT failure parts diagnosis 620 120 0 0 65535

Platen SS Registration Adjustment Platen SS Registration Adjust 620 121 100 16 184

Platen SS Magnification Adjustment Platen SS Magnification Adjust 620 122 50 44 56

Platen glass type 620 123 2 0 2

REGI correction value in FS direction on REGI corr value-FS dir on Platen 620 124 120 0 240
Platen

CVT FS Offset Side 1: Side1-1 (139.7 to CVT FS Off S1:S1-1 (139.7-148) 620 125 120 0 240
148)

CVT FS Offset Side 2: Side2-1 (139.7 to CVT FS Off S2:S2-1 (139.7-148) 620 126 120 0 240
148)

CVT FS Offset Side 1: Side1-2 (182 to 194) CVT FS Off S1:S1-2 (182-194) 620 127 120 0 240

CVT FS Offset Side 2: Side2-2 (182 to 194) CVT FS Off S2:S2-2 (182-194) 620 128 120 0 240

CVT FS Offset Side 1: Side1-3 (203.2) CVT FS Off S1:S1-3 (203.2) 620 129 120 0 240

CVT FS Offset Side 2: Side2-3 (203.2) CVT FS Off S2:S2-3 (203.2) 620 130 120 0 240

CVT FS Offset Side 1: Side1-4 (210) CVT FS Off S1:S1-4 (210) 620 131 120 0 240

CVT FS Offset Side 2: Side2-4 (210) CVT FS Off S2:S2-4 (210) 620 132 120 0 240

CVT FS Offset Side 1: Side1-5 (214.9 to CVT FS Off S1:S1-5 (214.9-215.9) 620 133 120 0 240
215.9)

CVT FS Offset Side 2: Side2-5 (214.9 to CVT FS Off S2:S2-5 (214.9-215.9) 620 134 120 0 240
215.9)

CVT FS Offset Side 1: Side1-6 (254 to 257) CVT FS Off S1:S1-6 (254-257) 620 135 120 0 240

CVT FS Offset Side 2: Side2-6 (254 to 257) CVT FS Off S2:S2-6 (254-257) 620 136 120 0 240

CVT FS Offset Side 1: Side1-7 (266.7 to CVT FS Off S1:S1-7 (266.7-267) 620 137 120 0 240
267)

CVT FS Offset Side 2: Side2-7 (266.7 to CVT FS Off S2:S2-7 (266.7-267) 620 138 120 0 240
267)

CVT FS Offset Side 1: Side1-8 (279.4) CVT FS Off S1:S1-8 (279.4) 620 139 120 0 240

CVT FS Offset Side 2: Side2-8 (279.4) CVT FS Off S2:S2-8 (279.4) 620 140 120 0 240

CVT FS Offset Side 1: Side1-9 (297) CVT FS Off S1:S1-9 (297) 620 141 120 0 240

CVT FS Offset Side 2: Side2-9 (297) CVT FS Off S2:S2-9 (297) 620 142 120 0 240

CVT FS Offset Side 1: Side3-1 (139.7 to CVT FS Off S1:S3-1 (139.7-148) 620 143 120 0 240
148)

CVT FS Offset Side 2: Side4-1 (139.7 to CVT FS Off S2:S4-1 (139.7-148) 620 144 120 0 240
148)

CVT FS Offset Side 1: Side3-2 (182 to 194) CVT FS Off S1:S3-2 (182-194) 620 145 120 0 240

A-120 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

CVT FS Offset Side 2: Side4-2 (182 to 194) CVT FS Off S2:S4-2 (182-194) 620 146 120 0 240

CVT FS Offset Side 1: Side3-3 (203.2) CVT FS Off S1:S3-3 (203.2) 620 147 120 0 240

CVT FS Offset Side 2: Side4-3 (203.2) CVT FS Off S2:S4-3 (203.2) 620 148 120 0 240

CVT FS Offset Side 1: Side3-4 (210) CVT FS Off S1:S3-4 (210) 620 149 120 0 240

CVT FS Offset Side 2: Side4-4 (210) CVT FS Off S2:S4-4 (210) 620 150 120 0 240

CVT FS Offset Side 1: Side3-5 (214.9 to CVT FS Off S1:S3-5 (214.9-215.9) 620 151 120 0 240
215.9)

CVT FS Offset Side 2: Side4-5 (214.9 to CVT FS Off S2:S4-5 (214.9-215.9) 620 152 120 0 240
215.9)

CVT FS Offset Side 1: Side3-6 (254 to 257) CVT FS Off S1:S3-6 (254-257) 620 153 120 0 240

CVT FS Offset Side 2: Side4-6 (254 to 257) CVT FS Off S2:S4-6 (254-257) 620 154 120 0 240

CVT FS Offset Side 1: Side3-7 (266.7 to CVT FS Off S1:S3-7 (266.7-267) 620 155 120 0 240
267)

CVT FS Offset Side 2: Side4-7 (266.7 to CVT FS Off S2:S4-7 (266.7-267) 620 156 120 0 240
267)

CVT FS Offset Side 1: Side3-8 (279.4) CVT FS Off S1:S3-8 (279.4) 620 157 120 0 240

CVT FS Offset Side 2: Side4-8 (279.4) CVT FS Off S2:S4-8 (279.4) 620 158 120 0 240

CVT FS Offset Side 1: Side3-9 (297) CVT FS Off S1:S3-9 (297) 620 159 120 0 240

CVT FS Offset Side 2: Side4-9 (297) CVT FS Off S2:S4-9 (297) 620 160 120 0 240

W-Ref adjustment factor Red 620 161 140 70 255

W-Ref adjustment factor Green 620 162 140 70 255

W-Ref adjustment factor Blue 620 163 140 70 255

W-Ref adjustment factor BW-X 620 164 140 70 255

W-Ref adjustment factor BW-Y 620 165 140 70 255

W-Ref adjustment factor Red (each sheet) W-Ref adj factor Red (sheet) 620 166 63 0 127

W-Ref adjustment factor Green (each sheet) W-Ref adj factor Green (sheet) 620 167 63 0 127

W-Ref adjustment factor Blue (each sheet) W-Ref adj factor Blue (sheet) 620 168 63 0 127

W-Ref adjustment factor BW (each sheet) W-Ref adj factor BW (sheet) 620 169 63 0 127

IIT paper code 620 170 0 0 8

Optical axis adjustment: front 620 171 990 0 1980

Optical axis adjustment: rear 620 172 990 0 1980

CVT FS Offset Side 1: Side1 620 173 120 0 240

CVT FS Offset Side 2: Side2 620 174 120 0 240

CVT FS Offset Side 1: Side3 620 175 120 0 240

CVT FS Offset Side 2: Side4 620 176 120 0 240

BW/Color auto recognition level 620 177 0 0 1

Black line adjustment level (for COLOR) Black line adj level (for COLOR) 620 178 8 0 15

Black line adjustment level (for BW) Black line adj level (for BW) 620 179 8 0 15

Black line adjustment test mode 620 180 0 0 7

BW adjustment table 620 181 0 0 7

HOSEI_SCAN (for detection) 620 182 3 0 6

HOSEI_SCAN (for image) 620 183 3 0 6

CCD Calib Y scan Red 620 184 0 0 1023

CCD Calib Y scanned: Green 620 185 0 0 1023

WorkCentre 6400 Service Manual A-121

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

CCD Calib Y scanned: Blue 620 186 0 0 1023

CCD Calib M scanned: Red 620 187 0 0 1023

CCD Calib M scanned: Green 620 188 0 0 1023

CCD Calib M scanned: Blue 620 189 0 0 1023

CCD Calib C scanned: Red 620 190 0 0 1023

CCD Calib C scanned: Green 620 191 0 0 1023

CCD Calib C scanned: Blue 620 192 0 0 1023

CCD Calib PK scanned: Red 620 193 0 0 1023

CCD Calib PK scanned: Green 620 194 0 0 1023

CCD Calib PK scanned: Blue 620 195 0 0 1023

Switching A6 document / postcard detection Switching A6/postcard detect 620 196 0 0 2

A4S/8.5in detection border switching 2 A4S/8.5in det. border switch 2 620 197 3 0 6

B5/8W10 detection switch 620 198 0 0 3

Switch 8.5W13/8.5W14 detections 620 199 0 0 3

Select special-document-detection table Select special-doc-detect table 620 200 0 0 2

Switch document size detection tables Switch docu size detect tables 620 201 2 1 5

Switch A3/11W17 detections 620 202 0 0 3

Switch A4/8.5W11 detections 620 203 0 0 3

Document size detection. 620 204 0 0 1

GCO/TFX sizes switching 620 205 1 0 1

B4/8-kai FS threshold setting 620 206 3 0 6

8-kai/11W17SEF FS threshold setting 8-kai/11W17SEF FS threshold 620 207 3 0 6

Switch B6/5W7 detections 620 208 0 0 2

Lamp check NG counts 620 209 0 0 65535

Data taken at lamp check NG. 620 210 0 0 1023

The number of AOC flow endings with error AOC flow endings with error 620 211 0 0 255

BW Copy BGR-AE adjustment level 620 212 0 0 4095

Color copy BGR-AE adjustment level Color copy BGR-AE adjust level 620 213 0 0 4095

BW Copy BGR-AE adjustment - speed- TP_BW_Copy BGR-AE-Level Speed 620 214 0 0 4095
prioritized

Color copy BGR-AE adjustment - speed- TX_CL_Copy BGR-AE-Level Speed 620 215 0 0 4095
prioritized AE (Text)

BW contone scan BGR-AE adjustment level TP_BW_Contone BGR-AE-Level Speed 620 216 0 0 4095
for speed-prioritized AE (Text photo)

Color contone scan BGR-AE adjustment TP_CL_Contone BGR-AE-Level Speed 620 217 0 0 4095
level for speed-prioritized AE (Text photo)

Background suppression; FS non-detected ABS; FS non-detected area 1 620 218 255 0 65535
area 1

Background suppression; FS non-detected ABS; FS non-detected area 2 620 219 255 0 65535
area 2

Background suppression; FS non-detected ABS; FS non-detected area 3 620 220 255 0 65535
area 3

Background suppression; FS non-detected ABS; FS non-detected area 4 620 221 255 0 65535
area 4

Background suppression; SS fixed position ABS; SS fixed position 620 222 60 0 65535

A-122 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Backgroundd suppression; SS end position ABS; SS end position (for HAE) 620 223 240 0 65535
(for HAE)

Background suppression; SS end position ABS; SS end position (for MAE) 620 224 240 0 65535
(for MAE)

Background suppression; SS end position ABS; SS end position (for NAE) 620 225 240 0 65535
(for NAE)

LIM control for BW COPY 620 226 1 0 1

LIM control for color COPY 620 227 1 0 1

LIM control for FAX and binary scan BW_Copy Variation Control(1-bit) 620 228 1 0 1

LIM control for contone scan 620 229 1 0 1

Background suppression threshold (HAE) ABS threshold (HAE) 620 230 127 0 255

Background suppression threshold (NAE1) ABS threshold (NAE1) 620 231 33 0 255

Background suppression threshold (NAE2) ABS threshold (NAE2) 620 232 204 0 255

Background suppression threshold (NAE3) ABS threshold (NAE3) 620 233 8 0 65535

Background suppression threshold (NAE4) ABS threshold (NAE4) 620 234 4 0 65535

AE control of FS size detection 620 235 0 0 1

AE parameter SS magnification correction AE param SS mag corr TopLimit 1 620 237 4000 0 4000
upper limit 1

AE parameter SS magnification correction AE param SS mag corr TopLimit 2 620 238 4000 0 4000
upper limit 2

AE parameter SS magnification correction AE param SS mag corr TopLimit 3 620 239 4000 0 4000
upper limit 3

AE parameter SS magnification correction AE param SS mag corr TopLimit 4 620 240 4000 0 4000
upper limit 4

FAX binary scan: background suppression TX_BW_Fax Offset Lvl AE 620 241 0 0 8191
Offset level; text mode (normal pencil)

Level for BW COPY FAX and binary scan: TP_BW_Copy_Fax Removal Lvl AE 620 242 0 0 4095
Text/photo mode (print photographic paper
copy)

OFFSET level for BW COPY FAX and binary TP_BW_Copy_Fax Offset Lvl AE 620 243 273 0 4095
scan: Text/photo mode (print photographic
paper copy)

Level for BW COPY FAX and binary scan: TX_BW_Copy_Fax Removal Lvl AE 620 244 0 0 4095
text mode (normal pencil)

OFFSET level for BW COPY FAX and binary TX_BW_Copy_Fax Offset Lvl AE 620 245 273 0 4095
scan: text mode (normal pencil)

Level for BW COPY FAX and binary scan: TPL_BW_Copy_Fax Removal Lvl AE 620 246 0 0 4095
text/photo mode (pale-color document)

OFFSET level for BW COPY FAX and binary TPL_BW_Copy_Fax Offset Lvl AE 620 247 273 0 4095
scan: text/photo mode (pale-color
document)

Level for BW COPY FAX and binary scan: TRP_BW_Copy_Fax Removal Lvl AE 620 248 0 0 4095
text mode (tracing paper)

OFFSET level for BW COPY FAX and binary TRP_BW_Copy_Fax Offset Lvl AE 620 249 273 0 4095
scan: text mode (tracing paper)

Level for Color COPY: text/photo mode TP_CL_Copy Removal Lvl AE 620 250 0 0 4095
(print photographic paper copy inkjet
highlighter)

OFFSET level for Color COPY: text/photo TP_CL_Copy Offset Lvl AE 620 251 0 0 4095
mode (print photographic paper copy inkjet
highlighter)

Level for Color COPY: text (normal) TX_CL_Copy Removal Lvl AE 620 252 0 0 4095

WorkCentre 6400 Service Manual A-123

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

OFFSET level for Color COPY: text (normal) TX_CL_Copy Offset Lvl AE 620 253 0 0 4095

Level for BW Contone Scan (text photo) TP_BW_Contone Removal Lvl AE 620 254 819 0 4095

OFFSET level for BW Condone Scan: (text TP_BW_Contone Offset Lvl AE 620 255 0 0 4095
photo)

Level for BW Contone Scan (other than text notTP_BW_Contone Removal Lvl AE 620 256 819 0 4095
photo)

OFFSET level for BW Contone Scan: (other notTP_BW_Contone Offset Lvl AE 620 257 30 0 4095
than text photo)

Level for Color Contone Scan (text photo) TP_CL_Contone Removal Lvl AE 620 258 28 0 4095

OFFSET level for Color Contone Scan: (text TP_CL_Contone Offset Lvl AE 620 259 27 0 4095
photo)

Level for Color Contone Scan (other than notTP_CL_Contone Removal Lvl AE 620 260 0 0 4095
text photo)

OFFSET level for Color Contone Scan (other notTP_CL_Contone Offset Lvl AE 620 261 0 0 4095
than text photo)

Two-face AE control parameter: lower limit 2F-AE LowLimit Multiplied Value 620 262 0 0 255
of multiplier coefficient

Two-face AE control parameter: upper limit 2F-AE TopLimit Multiplied Value 620 263 255 0 255
of multiplier coefficient

Two-face AE control parameter: comparison Offset for 2F AE Control 620 264 8 0 255
margin OFST

Two-face AE control parameter: background Threshold for 2F AE Control 620 265 16 0 255
level threshold LEVEL_N

Two-face AE control parameter: forced Mode Control of 2F AE 620 266 0 0 3

selection

Two color copy control 620 267 0 0 1

Tracing paper mode setting 620 268 0 0 1

Default color balance adjustment level Y: Def. ColorBal adj Y: low den. 620 269 4 0 8
low density

Default color balance adjustment level Y: Def. ColorBal adj Y: med den. 620 270 4 0 8
medium density

Default color balance adjustment level Y: Def. ColorBal adj Y: hi den. 620 271 4 0 8
high density

Default color balance adjustment level M: Def. ColorBal adj M: low den. 620 272 4 0 8
low density

Default color balance adjustment level M: Def. ColorBal adj M: med den. 620 273 4 0 8
medium density

Default color balance adjustment level M: Def. ColorBal adj M: hi den. 620 274 4 0 8
high density

Default color balance adjustment level C: Def. ColorBal adj C: low den. 620 275 4 0 8
low density

Default color balance adjustment level C: Def. ColorBal adj C: med den. 620 276 4 0 8
medium density

Default color balance adjustment level C: Def. ColorBal adj C: hi den. 620 277 4 0 8
high density

Default color balance adjustment level K: Def. ColorBal adj K: low den 620 278 4 0 8
low density

Default color balance adjustment level K: Def. ColorBal adj K: med den 620 279 4 0 8
medium density

Default color balance adjustment level K: Def. ColorBal adj K: hi den 620 280 4 0 8
high density

FS magnification correction (scanned on FS mag corr (PLATEN/BELT DADF) 620 281 50 0 100
PLATEN/BELT DADF)

A-124 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

FS magnification correction (scanned on FS mag corr (CVT) 620 282 50 0 100

CVT)

IPS Through Bypass setting 1(A) 620 283 0 0 65535

IPS through (bypass) setting 2 620 284 0 0 65535

BW COPY: text; normal density adjustment BW COPY: text; normal dens adj 620 285 128 0 256

BW COPY: text; Darker 3 density adjustment BW COPY: text; Darker3 dens adj 620 286 128 0 256

Scan/FAX: text; normal density adjustment Scan/FAX: text; normal dens adj 620 287 128 0 256

Scan/FAX: text; Darker 3 density adjustment Scan/FAX: text; Darker3 dens adj 620 288 128 0 256

Speed prioritized background suppression; PLTN RAE SS Not Detect Area 620 289 0 0 65535
SS non-detection area for Platen M/C

Speed prioritized background suppression; DADF-P-Job RAE SSNotDetect Area 620 290 0 0 65535
SS non-detection area for platen job on
DADF M/C

Speed prioritized background suppression; DADF-D-Job RAE SSNotDetect Area 620 291 0 0 65535
SS non-detection area for DADF job on
DADF M/C

Hue angle B start 620 292 270 0 360

Hue angle B end 620 293 320 0 360

Hue angle G start 620 294 110 0 360

Hue angle G end 620 295 200 0 360

Hue angle R start 620 296 350 0 360

Hue angle R end 620 297 60 0 360

Hue angle Y start 620 298 60 0 360

Hue angle Y end 620 299 120 0 360

Hue angle M start 620 300 320 0 360

Hue angle M end 620 301 360 0 360

Hue angle C start 620 302 190 0 360

Hue angle C end 620 303 280 0 360

IISS-DADF communication Fail 620 304 0 0 65535

IISS-Controller communication Fail IISS-Controller comm Fail 620 306 0 0 65535

DADF EEPROM Fail 620 308 0 0 65535

IPS Fan Fail 620 310 0 0 65535

CRG Position Fail 620 312 0 0 65535

IISS LOGIC Fail 620 314 0 0 65535

Lamp Illumination Fail 620 316 0 0 65535

CRG Over Run Fail 620 318 0 0 65535

Lamp Fan Fail 620 320 0 0 65535

CCD Fan Fail 620 322 0 0 65535

AGC Fail 620 324 0 0 65535

AOC Fail 620 326 0 0 65535

IPS PWBA Fail 620 328 0 0 65535

IISS-EXT communication Fail 620 330 0 0 65535

Extension EEPROM Fail 620 332 0 0 65535

IPS-EXT Connection Fail 620 334 0 0 65535

WorkCentre 6400 Service Manual A-125

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

IPS-YATA Connection Fail 620 336 0 0 65535

EXT-YATA Connection Fail 620 338 0 0 65535

YATA PWBA Fail 620 340 0 0 65535

IPS PWBA Memory Fail 620 342 0 0 65535

IIT Hot Line Fail 620 344 0 0 65535

Scan Count replacement life (upper) Scan Count replace life (upper) 620 346 91 0 65535

Scan Count replacement life (lower) Scan Count replace life (lower) 620 347 36224 0 65535

Lamp-On time Count replacement life Lamp-On time replace life (max) 620 348 109 0 65535
(upper)

Lamp-On time Count replacement life Lamp-On time replace life (min) 620 349 56576 0 65535
(lower)

Lamp-On Count Replacement life (upper) Lamp-On Count replace life (max) 620 350 91 0 65535

Lamp-On Count Replacement life (lower) Lamp-On Count replace life (min) 620 351 36224 0 65535

Fax Document Size Detection for DADF Fax doc Size detect DADF 620 352 0 0 1

JAM bypass 620 353 0 0 1

8.5 W11 LEF threshold 620 354 2093 1993 2193

B5SEF / 8 W10 SEF switching 620 355 0 0 1

11 W15 SEF / 8-kai switching in AP market 11x15 SEF/8-kai switch (AP Mkt) 620 356 0 0 1

FS MAX value 620 357 2970 1297 3070

FS MIN value 620 358 2970 1297 3070

SS MAX value 620 359 2100 1297 4418

SS MIN value 620 360 2100 1297 4418

Document Size 620 361 8 3 20

Specify document feed direction 620 362 0 0 1

Select DADF document size detection table DADF Doc Size Detection Table 620 363 0 0 1
custom registration

S-size document Side2 Lead Regi correction S Size Side2 Lead Regi Adjust 620 364 250 217 283
value

M-size document Side2 Lead Regi M Size Side2 Lead Regi Adjust 620 365 250 217 283
correction value

L-size document Side2 Lead Regi correction L Size Side2 Lead Regi Adjust 620 366 250 217 283
value

Size mismatch Jam detection setting Size Miss Match Set(Simp) 620 367 1 1 2
(applicable to only Simplex Mode)

Alternate Size switching 1 620 368 1 1 2

Alternate Size switching 2 620 369 1 1 2

Alternate Size switching 3 620 370 0 0 2

Alternate Size switching 4 620 371 0 0 2

Alternate Size switching 5 620 372 0 0 2

Alternate Size switching 6 620 373 0 0 3

Alternate Size switching 7 620 374 0 0 3

Alternate Size switching 8 620 375 0 0 4

Alternate Size switching 9 620 376 0 0 2

Alternate Size switching 10 620 377 0 0 2

Alternate Size switching 11 620 378 0 0 3

A-126 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Size-Mix Mode temporary size direction Size-Mix Mode Assumed Size 620 379 1 0 1

Fax job Mix Size Standard mode 620 380 0 0 1

DADF DPM selection 620 381 80 0 65535

Magnification correction control 620 382 0 0 1

Color BW judgment level 620 383 2 0 4

YATAGRS text mode Photo and Text Textmode Photo/Text RecogLvl 620 384 2 0 4
Recognition level

BW copy (text photo) AE adjustment level BW copy (text photo) AE adj lvl 620 385 0 0 4095

Color copy (text photo) AE adjustment level CL copy (text photo) AE adj lvl 620 386 0 0 4095

BW Copy (text) AE adjustment level BW Copy text AE adjustment level 620 387 0 0 4095

Color Copy (text) AE adjustment level CL Copy (text) AE adj lvl 620 388 0 0 4095

BW Copy for B AE adjustment level BW CopyFor B AE adjustt level 620 389 0 0 4095

BW Copy for G and R AE adjustment level BW Copy G and R AE adj lvl 620 390 0 0 4095

Color Copy for B AE adjustment level CL Copy B AE adj lvl 620 391 0 0 4095

Color Copy for G and R AE adjustment level CL Copy G and R AE adj lvl 620 392 0 0 4095

BW Copy (text) for B AE adjustment level BW Copy (text) B AE adj lvl 620 393 0 0 4095

BW Copy (text) for G and R AE adjustment BW Copy (text) G & R AE adj lvl 620 394 0 0 4095
level

Color Copy (text) for B AE adjustment level CL Copy (text) B AE adj lvl 620 395 0 0 4095

Color Copy (text) for G and R AE adjustment CL Copy (text) G & R AE adj lvl 620 396 0 0 4095
level

EXT. Tail Reg. adjustment (55.0mm/sec) EXT. Tail Reg. adj (55.0mm/sec) 620 397 122 0 244

EXT. Tail Reg. adjustment (73.3mm/sec) EXT. Tail Reg. adj (73.3mm/sec) 620 398 122 0 244

EXT. Tail Reg. adjustment (82.5mm/sec) EXT. Tail Reg. adj (82.5mm/sec) 620 399 122 0 244

EXT. Tail Reg. adjustment (110.0mm/sec) EXT. Tail Reg. adj (110.0mm/sec) 620 400 122 0 244

EXT. Tail Reg. adjustment (146.7mm/sec) EXT. Tail Reg. adj (146.7mm/sec) 620 401 122 0 244

EXT. Tail Reg. adjustment (165.0mm/sec) EXT. Tail Reg. adj (165.0mm/sec) 620 402 122 0 244

EXT. Tail Reg. adjustment (293.3mm/sec) EXT. Tail Reg. adj (293.3mm/sec) 620 403 122 0 244

EXT. Tail Reg. adjustment (220mm/sec) EXT. Tail Reg. adj (220mm/sec) 620 404 122 0 244

EXT. Tail Reg. adjustment (330mm/sec EXT. Tail Reg. adj (330mm/sec 620 405 122 0 244

EXT. Tail Reg. adjustment (440mm/sec) EXT. Tail Reg. adj (440mm/sec) 620 406 122 0 244

EXT. Lead Edge. adjustment (55.0mm/sec) EXT. LE. adj (55.0mm/sec) 620 407 122 0 244

EXT. Lead Edge. adjustment (73.3mm/sec) EXT. LE. adj (73.3mm/sec) 620 408 122 0 244

EXT. Lead Edge. adjustment (82.5mm/sec) EXT. LE. adj (82.5mm/sec) 620 409 122 0 244

EXT. Lead Edge. adjustment (110.0mm/sec) EXT. LE. adj (110.0mm/sec) 620 410 122 0 244

EXT. Lead Edge. adjustment (146.7mm/sec) EXT. LE. adj (146.7mm/sec) 620 411 122 0 244

EXT. Lead Edge. adjustment (165.0mm/sec) EXT. LE. adj (165.0mm/sec) 620 412 122 0 244

EXT. Lead Edge. adjustment (293.3mm/sec) EXT. LE. adj (293.3mm/sec) 620 413 122 0 244

EXT. Lead Edge. adjustment (220mm/sec) EXT. LE. adj (220mm/sec) 620 414 122 0 244

EXT. Lead Edge. adjustment (330mm/sec) EXT. LE. adj (330mm/sec) 620 415 122 0 244

EXT. Lead Edge. adjustment (440mm/sec) EXT. LE. adj (440mm/sec) 620 416 122 0 244

CVT FS Offset 1p Duplex Side2-1 620 417 120 0 240

CVT FS Offset 1p Duplex Side2-2 620 418 120 0 240

WorkCentre 6400 Service Manual A-127

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

CVT FS Offset 1p Duplex Side2-3 620 419 120 0 240

CVT FS Offset 1p Duplex Side2-4 620 420 120 0 240

CVT FS Offset 1p Duplex Side2-5 620 421 120 0 240

CVT FS Offset 1p Duplex Side2-6 620 422 120 0 240

CVT FS Offset 1p Duplex Side2-7 620 423 120 0 240

CVT FS Offset 1p Duplex Side2-8 620 424 120 0 240

CVT FS Offset 1p Duplex Side2-9 620 425 120 0 240

1p Duplex Center Regi position 620 426 3598 0 7196

CIS black level Average number of lines CIS black level Avg # lines 620 427 3 0 3

Target for black level auto adjust Target black level auto adjust 620 428 16 0 255

Target for white level auto adjust Target white level auto adjust 620 429 820 0 1023

Digital Offset Level 620 430 512 0 1023

Black Level Correction Value 620 431 128 0 255

White Level Correction Value 620 432 255 0 255

DIPS white level; the average number of DIPS white level; Avg # lines 620 433 4 0 4
lines

White stability adjustment start point White stability adj start point 620 434 10 0 4095

White stability adjustment average area White stability adj Avg area 620 435 217 0 255

White stability adjustment Reference value White stability adj Ref value 620 436 962 0 1023

W-Ref density correction factor 620 437 158 100 255

Fine adjustment factor for highlight at white Fine adj hilite WhiteStability 620 438 100 80 120
stability adjustment

W-Ref density correction factor set value W-Ref den. corr factor set value 620 439 255 0 255

EXT. Lead Reg. adjustment (460mm/sec) EXT. Lead Reg. adj (460mm/sec) 620 440 122 0 244

EXT. Tail Edge. adjustment (460mm/sec) EXT. Tail Edge. adj (460mm/sec) 620 441 122 0 244

Switching main / sub 620 442 1 0 1

Shading correction dust detection threshold Ship Garbage detection Thresh 620 443 500 0 5000
at shipment

EXT Fail bypass 620 444 0 0 1

Daimajin Fail bypass 620 445 0 0 1

Data obtained at white stability adjustment Data on WhiteStability adj fail 620 446 1023 0 1023
failure

Pre ASIC Through setting 1 620 447 448 0 8191

BW-PG density 620 448 128 0 255

FS non-detection area 1 620 449 255 0 65535

FS non-detection area 3 620 450 255 0 65535

SS fixed position 620 451 60 0 65535

LIM control for BW COPY 620 452 1 0 1

LIM control for FAX and binary scan LIM control FAX and binary scan 620 453 1 0 1

LIM control for contone scan 620 454 1 0 1

AE FS size detection control 620 455 0 0 1

Upper Limit of SS Magnification correction TopLimit SS mag corr AE param1 620 457 4000 0 4000
AE Parameter1

A-128 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Shading correction dust detection threshold Ship Thresh of Garbage Detect 620 458 2000 0 5000
in market

Adjusting all Lead Regi at once 620 459 122 0 244

Adjusting all Taile Edge at once 620 460 122 0 244

Adjusting all FS offset at once 620 461 120 0 240

Level for BW COPY FAX and binary scan: TP_BW_Copy_Fax Removal lvl AE 620 462 0 0 4095
(print photographic paper copy)

OFFSET level for BW COPY FAX and binary TP_BW_Copy_Fax Offset lvl AE 620 463 273 0 4095
scan: (print photographic paper copy)

Level for BW COPY FAX and binary scan: TX_BW_Copy_Fax Removal lvl AE 620 464 0 0 4095
(normal pencil)

OFFSET level for BW COPY FAX and binary TX_BW_Copy_Fax Offset lvl AE 620 465 273 0 4095
scan: (normal pencil)

Level for BW COPY FAX and binary scan: TPL_BW_Copy_Fax Removal lvl AE 620 466 0 0 4095
(pale-color document)

OFFSET level for BW COPY FAX and binary TPL_BW_Copy_Fax Offset lvl AE 620 467 273 0 4095
scan: (pale-color document)

Level for BW COPY FAX and binary scan: TRP_BW_Copy_Fax Removal lvl AE 620 468 0 0 4095
(tracing paper)

OFFSET level for BW COPY FAX and binary TRP_BW_Copy_Fax Offset lvl AE 620 469 273 0 4095
scan: (tracing paper)

Level for BW Contone Scan (text photo) Level BW Cont. Scan (TP) 620 470 0 0 4095

OFFSET level for BW Contone Scan: (text Off level BW Cont. Scan (TP) 620 471 0 0 4095
photo)

Level for BW Contone Scan (other than text Level BW Cont. Scan (not TP) 620 472 0 0 4095
photo)

OFFSET level for BW Contone Scan: (other Off level BW Cont. Scan (not TP) 620 473 0 0 4095
than text photo)

EXT Major Version 620 474 0 0 65535

EXT Minor Version 620 475 0 0 65535

EXT Revision Version 620 476 0 0 65535

EXT Patch Version 620 477 0 0 65535

Default color balance adjustment level K: Def. ColorBal adj K: low den(2) 620 478 4 0 8
low density

Default color balance adjustment level K: Def. ColorBal adj K: med den(2) 620 479 4 0 8
medium density

Default color balance adjustment level K: Def. ColorBal adj K: hi den(2) 620 480 4 0 8
high density

Photo and Text Recognition level 620 481 2 0 4

FS Magnification Adjustment (at CVT scan) FS mag Adjust (at CVT scan) 620 482 50 0 100

IPS Through Bypass setting 1(B) 620 483 0 0 511

BW COPY; text; normal density adjustment BW COPY; text; normal den. adj 620 484 128 0 256

BW COPY; text; darker 3 density adjustment BWCopyTextDarker 3 DensityAdjust 620 485 128 0 256

Scan/FAX; text normal density adjustment Scan/FAX; text normal den. adj 620 486 128 0 256

Scan/FAX; text darker 3 density adjustment Scan/FAX; text darker3 den. adj 620 487 128 0 256

SS non-detection band 620 488 0 0 65535

SS end position (for noise removal) SS end position (noise removal) 620 489 240 0 65535

Parameter SS Magnification correction param SS mag corr TopLimit 620 490 4000 0 4000
Upper Limit

WorkCentre 6400 Service Manual A-129

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Shading correction dust detection threshold Dust detect threshold in market 620 491 500 0 5000
in market

Selection of Shading data for removing ShadingData blackline remove 620 492 1 0 1
black line

White reference value at shipment White Reference ValueAtShipment 620 493 636 0 1000

White-correction multiplier coefficient White-corr multiplier coeff 620 494 0 0 1

Paper dust detection threshold 620 495 150 0 10000

VALID starting position 620 496 288 0 1000

Fault Counter 77-311-00: No. of faults DocumentFeederCoverOpenFC 620 534 0 0 255

Fault Counter 15-007: No. of faults IITInternalTargetFailFC 620 536 0 0 255

IITInternalTargetFailFC

Fault Counter 15-008: IITOpticalErrorFC No. of faults IITOpticalErrorFC 620 537 0 0 255

Fault Counter 14-001: No. of faults IITHomePositionErrorFC 620 538 0 0 255

IITHomePositionErrorFC

Fault Counter 15-009: No. of faults IITManualCalibrationFailFC 620 539 0 0 255

IITManualCalibrationFailFC

Fault Counter 15-010: No. of faults IITManualCalibrationLEFailFC 620 540 0 0 255

IITManualCalibrationLEFailFC

Fault Counter 15-011: No. of faults IITManualCalibrationSEFailFC 620 541 0 0 255

IITManualCalibrationSEFailFC

Fault Counter 15-012: No. of faults IITManualCalShadingTargetFailFC 620 542 0 0 255

IITManualCalShadingTargetFailFC

Fault Counter 05-161: No. of faults JamDocumentFeederFC 620 543 0 0 255

JamDocumentFeederFC

Fault Counter 14-002: ScannerMissingFC No. of faults ScannerMissingFC 620 544 0 0 255

Fault Counter 14-003: ScanHeadLockedFC No. of faults ScanHeadLockedFC 620 545 0 0 255

Fault Counter 14-004: No. of faults ClearDocumentGlassFC 620 546 0 0 255

ClearDocumentGlassFC

Fault Counter 14-005: No. of faults DocumentFeederDisconnectedFC 620 547 0 0 255

DocumentFeederDisconnectedFC

Fault Counter 05-169-00: Scanner Cooling Scanner cooling fan trouble ScannerCoolingFanTroubleFC 620 555 0 0 255
fan trouble

NUP Layout Pattern 621 1 0 0 1

Determines whether rotation is enabled for Rotation enabled for RE 621 2 1 0 1

reduction/ enlargement. 0=False, 1=True

Determines whether rotation is enabled for Rotation enabled for APS 621 3 1 0 1
APS. 0=False, 1=True

Signature Layout Changeable 621 4 0 0 1

Use New Messaging 621 5 1 0 1

Rotation Debug 621 6 1 0 1

Defines previous market region 0=USCO, Previous Market Region 621 9 0 0 5

1=XCL, 2=FX, 3=FXAPO, 4=ACO, 5=RX

Lakes Legacy Scan 621 10 1 0 1

spuiNeedsToInitNvm spuiNeedsToInitNvm 633 1 1 0 1

Internal image print job priority Internal ImagePrintJobPriority 641 1 1 1 65535

Fault Counter 22-321-04: RS422 RS422 (EPSV) Config MismatchFC 648 5 0 0 255
configuration mismatch.

Fault Counter 22-750-17: Accessory card Accessory Card Config MismatchFC 648 6 0 0 255
configuration mismatch.

Fault Counter 22-755-17: RDT configuration RDT Config Mismatch FC 648 7 0 0 255
mismatch.

Fault Counter 03-331-00: ESS NC Comm Lost Fault 648 8 0 0 255

communication lost fault.

Fault Counter 03-338-00: for detection of DC Crash Detected Fault 648 9 0 0 255
DC crash at power up.

Fault Counter 03-347-00: UI communication UI Comm Lost Fault 648 10 0 0 255

lost fault.

Fault Counter 03-777-00: power loss Power Loss Detected Fault 648 11 0 0 255
detected fault.

Defines DC platform's current install phase. DC Platform Install Phase 648 12 4 0 4

Fault Counter 03-346-00: UI communication UI Comms failureFC 648 13 0 0 255

failure.

Fault Counter 03-332-00: ESS NC Comm Dead Fault 648 14 0 0 255

communication is down fault.

Defines current state of communication to DCPMF.SPMGR.PWS 648 15 0 0 10

the PWS.

Defines whether machine phone number Machine Phone Number Setup 648 16 0 0 1
has been set up. 0=False, 1=True

DC Platform Post Upgrade Phase 648 17 0 0 1

DC Platform Post Upgrade Retry Count DCPlatformPostUpgradeRetry Cnt 648 18 0 0 255

Defines the current state of FDI detection. 0 = Auto Detect (Enable/disable FDI Present 648 23 2 0 2
FDI based on detection of
appropriate hardware)
1 = Always Enabled
2 = Always Disabled

Determines whether double count is enabled LargePaperCount 649 1 0 0 1

0=False, 1=True

This specifies the amount of time FI will wait CancelJobTimerValue 649 2 60 0 900
(seconds) before deleting a job when
authentication has been removed.

PreCountDuration 649 3 100 0 200

CountDuration 649 4 100 0 200

PostCountDuration 649 5 100 0 200

ExitDuration 649 6 100 0 200

EnableOnInternalCredits 649 7 0 0 1

DeviceType 649 8 0 0 4

PremiumSelect 649 9 0 0 3

CopyRestricted 649 10 1 0 1

PrintRestricted 649 11 0 0 1

s2fRestricted 649 12 0 0 1

EFaxSendRestricted 649 13 0 0 1

EFaxReceiveRestricted 649 14 0 0 1

WorkCentre 6400 Service Manual A-131

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

submitPolicy submitPolicy 652 4 0 0 2

jobMgmtPolicy jobMgmtPolicy 652 5 1 0 2

Copy Authentication Policy (none, internal, authPolicy 652 6 0 0 8

external, EPSV or JBA)

Copy Accounting Policy (none, internal, acctPolicy 652 7 0 0 8

external, EPSV, or JBA)

invalidAccountPolicy invalidAccountPolicy 652 8 1 0 2

nullAccountPolicy nullAccountPolicy 652 9 1 0 2

Print Authentication Policy (none, internal, PrintAuthenticationPolicy 652 10 0 0 8

external, EPSV or JBA)

Print Accounting Policy (none, internal, PrintAccountingPolicy 652 11 0 0 8

external, EPSV or JBA)

InvalidAccountPolicy InvalidAccountPolicy 652 12 1 0 2

NullAccountPolicy NullAccountPolicy 652 13 1 0 2

Scan to File Authentication Policy (none, ScanToFileAuthenticationPolicy 652 14 0 0 8

internal, external, EPSV or JBA)

Scan to File Accounting Policy (none, ScanToFileAccountingPolicy 652 15 0 0 8

internal, external, EPSV or JBA)

ScanToFileInvalidPinPolicy ScanToFileInvalidPinPolicy 652 16 1 0 2

ScanToFileNullPinPolicy ScanToFileNullPinPolicy 652 17 1 0 2

Auditron - Set Hour Auditron - Set Hour 652 18 0 0 23

Auditron - Set Minute Auditron - Set Minute 652 19 0 0 59

Auditron - Set Second Auditron - Set Second 652 20 0 0 59

Auditron - Set Month Auditron - Set Month 652 21 1 1 12

Auditron - Set Day Auditron - Set Day 652 22 1 1 31

Auditron - Set Year Auditron - Set Year 652 23 70 70 135

Auditron - Wall Clock Auditron - Wall Clock 652 24 0 0 4.29E+09

Fax Send Authentication Policy (none, Fax Send Authenticity Policy 652 25 0 0 8
internal, external, EPSV or JBA)

Fax Send Accounting Policy (none, internal, Fax Send Accounting Policy 652 26 0 0 8
external, EPSV or JBA)

Fax Send Invalid Pin Policy Fax Send Invalid Pin Policy 652 27 1 0 2

Fax Send Null Pin Policy Fax Send Null Pin Policy 652 28 1 0 2

Fax Receive Authentication Policy (none, Fax Receive Authenticity Policy 652 29 0 0 8
internal, external, EPSV or JBA)

Fax Receive Accounting Policy (none, Fax Receive Accounting Policy 652 30 0 0 8
internal, external, EPSV or JBA)

Fax Receive Invalid Pin Policy Fax Receive Invalid Pin Policy 652 31 1 0 2

Fax Receive Null Pin Policy Fax Receive Null Pin Policy 652 32 1 0 2

CopyActivity CopyActivity 652 33 0 0 4.29E+09

HolePunchCount HolePunchCount 652 38 0 0 4.29E+09

StapleCount StapleCount 652 39 0 0 4.29E+09

CustomerName CustomerName 652 40 0 0 4.29E+09

MonoImpressionCount MonoImpressionCount 652 41 0 0 4.29E+09

ColourImpressionCount ColourImpressionCount 652 42 0 0 1

CopyActivityPen CopyActivityPen 652 43 0 0 4

A-132 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

CopyActivityJobIDGenerator CopyActivityJobIDGenerator 652 46 256 2 65535

PermServiceSOAValues PermServiceSOAValues 652 49 1 0 255

PermCreateJob PermCreateJob 652 50 7 0 255

PermCancelJob PermCancelJob 652 51 23 0 255

PermInterruptJob PermInterruptJob 652 52 3 0 255

PermPauseJob PermPauseJob 652 53 3 0 255

PermQueryJob PermQueryJob 652 54 7 0 255

PermResumeJob PermResumeJob 652 55 3 0 255

PermSubmitJob PermSubmitJob 652 56 7 0 255

PermJobLOAValues PermJobLOAValues 652 57 7 0 255

PermJobSOAValues PermJobSOAValues 652 58 3 0 255

PermCreateDocument PermCreateDocument 652 59 7 0 255

PermDeleteDocument PermDeleteDocument 652 60 18 0 255

PermDocumentLOAValues PermDocumentLOAValues 652 61 7 0 255

PermDocumentSOAValues PermDocumentSOAValues 652 62 3 0 255

PermProofJob PermProofJob 652 63 7 0 255

PermProofDocument PermProofDocument 652 64 7 0 255

PermPromoteJob PermPromoteJob 652 65 5 0 255

PermHoldJob PermHoldJob 652 66 3 0 255

PermReleaseJob PermReleaseJob 652 67 35 0 255

Tiered level 1 copy accounting XSA will use this to allow color Tiered level 1 copy accnting 652 69 0 0 1
level 1 copies to be mapped to
B/W

Tiered level 1 print accounting XSA will use this to allow color Tiered level 1 print accnting 652 70 0 0 1
level 1 prints to be mapped to
B/W

JBA display restricted JBA display restricted 652 71 1 0 1

JBA display fields 0 JBA display fields 0 652 76 1 0 1

JBA display fields 1 JBA display fields 1 652 77 1 0 1

JBA Display masks 0 JBA display masks 0 652 78 0 0 1

JBA Display masks 1 JBA display masks 1 652 79 0 0 1

Fault Counter 19-300-00: Image disk read Image Disk READ Failure. 656 1 0 0 255
failure

Fault Counter 19-301-00: Image disk write Image Disk WRITE Failure. 656 2 0 0 255
failure

Fault Counter 19-302-00: Image disk bad Image Disk BAD DATA ERROR. 656 3 0 0 255
data error

Fault Counter 19-303-00: Image disk unable ImageDiskUnableToFormatError. 656 4 0 0 255

to format

Fault Counter 19-310-00: Image disk Image Disk NoDiskCapacityError 656 5 0 0 255
capacity not given at power on

Toner empty display location TonerEmptyDspLoc 658 1 0 0 3

FdRollLife 658 2 150 0 200

PDRNNotify 658 3 0 0 16

0=UI, 1=Network, 2=Both, 3=Neither SupplyInfoFlag 658 4 0 0 3

WorkCentre 6400 Service Manual A-133

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

CRU manager debug printouts CruMgrDebugPrint 658 5 0 0 1

0 = False, 1 = rue

0 = False, 1 = True PDRNNotifyProc 658 6 0 0 1

Reorder message displayed (days before FuserReorderMsgTrig 658 7 3 1 25

End of Life)

Reorder message displayed (days before XeroReorderMsgTrig 658 8 3 1 25

End of Life)

FuserReorderDspLoc 658 9 0 0 3

XeroReorderDspLoc 658 10 0 0 3

FuserReplDspLoc 658 11 0 0 3

XeroReplDspLoc 658 12 0 0 3

Threshold value for Imaging Units Stores remaining threshold value ImageUnitReorderMsgTrig 658 19 5 0 65535
to trigger low supplies warnings

Threshold value for Fuser Stores remaining threshold value FuserReorderMsgTrigger 658 20 5 0 65535
to trigger low supplies warnings

Threshold value for Transfer Roller Stores remaining threshold value XferRollerReorderMsgTrig 658 21 5 0 65535
to trigger low supplies warnings

Threshold value for Transfer Belt Stores remaining threshold value XferBeltReorderMsgTrig 658 22 5 0 65535
to trigger low supplies warnings

Counts the number of days in which a system increments counter DayCounter 658 23 0 0 255
threshold number of impressions have
occurred. After {MarkUsageCalcDuration}
days, this is reset to 0.

Stores the number of impressions made system increments counter DayUsage 658 24 0 0 4.29E+09
every day being counted for up to
{MarkUsageCalcDuration} days

Minimum number of impressions to adpvThreshold adpvThreshold 658 25 20 0 65535

consider the day to be a "usage" day. If the
machine has not made at least n
impressions, don’t count the day

Average daily volume system calculates this adpv 658 27 1000 0 4.29E+09

Pages per Black Colorant Use a default for now. System PagesBlackCRU 658 28 8590 0 4.29E+09
may eventually calculate this
value

Pages per Color Colorant Use a default for now. System PagesColorCRU 658 29 7884 0 4.29E+09
may eventually calculate this
value

Reorder Threshold value (Percent %) for Ink Stores remaining threshold value ReorderMsgTrigPercent 658 31 5 0 65535
or Toner to trigger low supplies warnings

This determines how often the ADPV 1 = refresh daily, MarkUsageCalcDuration 658 39 10 1 255
calculation is refreshed 10 = every 10 days

This determines how often ADPV is 1 = calculate daily MarkUsageCalcFrequency 658 41 1 1 255
calculated. This value should never exceed
ScanFeedUsageCalcDuration, but code will
check for this condition

Specify what JBA should do when it runs Out Of Resource Policy 665 1 0 0 1
out of space.

Specify what JBA should do if it can't Comm Failed Policy 665 2 0 0 2

communicate with the ESS.

Specify if JBA should Authorize logins and EAS Validation Enable 665 3 1 0 1
submit jobs with the ESS.

EFaxSendJobPriority 671 1 3 1 65535

EMBFAXSENDTransmitImagesDisplayable EMBFAXSENDTransmitImagesDisplay 671 4 1 0 1

SendShortJobRecoveryWaitTime 671 11 5 1 255

A-134 WorkCentre 6400 Service Manual

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

SendJobRecoverySendResponseTimeout SendJobRecoverySendRespTimeout 671 12 120 1 255

SendJobRecoveryWaitTime 671 13 120 1 255

SendJobRecoveryImageResponseTimeout SendJobRecoverImageRespTimeout 671 14 120 1 255

SendJobRecoveryCompletedQUpdate SendJobRecovComplQUpdate Timeout 671 15 120 1 255

Timeout

SendJobRecoveryCreateJobTimeout 671 16 3 1 255

SendLowFaxMemoryWaitTime 671 17 20 1 255

SendJobRecoveryRetryCounter 671 18 3 1 255

EFaxReceiveJobPriority 672 1 3 1 65535

EMBFAXRECEIVESheetsDisplayable 672 4 0 0 1

EMBFAXRECEIVEDuplexSheetsDisplayable EFaxRecPlexSheetsDisplayable 672 6 0 0 1

EMBFAXRECEIVELargeSheetsDisplayable EMBFAXRECEIVELargeSheetsDisplay 672 8 0 0 1

EMBFAXRECEIVEMarkedImagesDisplayable Emb Fax Rec Marked Images Disp 672 13 1 0 1

NextImageTimeOut 672 14 300 100 1000

EFPrintCompleted Job Log Location EFPrintCompletedJob Log Location 672 16 0 0 70

EF Card Disturbance Timeout 672 17 12 1 255

Postpone fax install 673 1 0 0 1

Indication of whether the Fax Card was 0 = Not Present EmbeddedFax Basic Previous State 673 2 1 0 2
detected at previous power up. When this 1 = Present and configured
NVM differs from current power up 2 = Present but not yet
hardware detection, a Config Mismatch is configured
raised.

Fault Counter 03-401-00: Basic fax not Basic FAX Not Detected FC 673 5 0 0 255
detected

Fault Counter 20-701-00: Fax phone book Fax Phone book Download Fault 673 6 0 0 255
download failed

Fault Counter 03-403-00: Extended fax not Extended FAX Not Detected FC 673 7 0 0 255
detected

Fault Counter 20-302-00: Unexpected reset Fax Unexpected Reset Fault 673 8 0 0 255

Fault Counter 20-303-00: Fax Basic Card Fax BasicCardUnrecoverable Fault 673 9 0 0 255
Unrecoverable Fault

Fault Counter 20-305-00: Fax System Low Fax Sys Low Mem Unrecover Fault 673 10 0 0 255
Memory Unrecoverable Fault

Fault Counter 20-320-00: Fax card not Fax Not Cleared By Reset Fault 673 11 0 0 255
cleared by reset

Fault Counter 20-341-00: Basic fax card Fax Basic Card Failed Fault 673 12 0 0 255
failed

Fault Counter 20-327-00: Extended fax card Fax Extended Card Failed Fault 673 13 0 0 255
failed

Fault Counter 20-322-00: Fax NVM Not Fax NV Device Not Present Fault 673 14 0 0 255
Present

Fault Counter 20-323-00: Fax System Low Fax System Low Mem Recover Fault 673 15 0 0 255
Memory Recoverable Fault

Fault Counter 20-324-00: Fax Out of File Fax Out Of File Memory Fault 673 16 0 0 255
Memory Fault

Fault Counter 20-342-00: Fax - Error access Fax File Integrity Fault 673 17 0 0 255
file on NV

Fault Counter 20-331-00: Fax - No Comms Fax Network Line 1 Fault 673 18 0 0 255
via PSTN Line 1

Fault Counter 20-332-00: Fax - No Comms Fax Network Line 2 Fault 673 19 0 0 255
via PSTN Line 2

WorkCentre 6400 Service Manual A-135

Reference

Copy Controller NVM Value (Continued)

NVM NVM
Description Setting Information dc131 Display Name Default Min Max
ID Index

Fault Counter 20-339-00: Fax Port 1 fault Fax Port 1 Fault 673 20 0 0 255

Fault Counter 20-340-00: Fax Port 2 fault Fax Port 2 Fault 673 21 0 0 255

Fault Counter 20-323-00: Fax Memory Low no. of faults FaxMemoryLowFC 673 24 0 0 255

Fault Counter 20-350-00: no. of faults NoDialToneWarnFC 673 25 0 0 255

Fault Counter 20-351-00: no. of faults NoDialToneFC 673 26 0 0 255

Fault Counter 20-302-00: no. of faults FaxModemNotAvailableFC 673 27 0 0 255

Actually used for faults 20-302, 20-303 &
20-305

A-136 WorkCentre 6400 Service Manual

Reference

WorkCentre 6400 Menu Map

Menu Map (page 1)

L
Layout Ad
Adustment
Services Home
Original Orientation
Main menu of services Original Size
Note: Default home screen
can be changed.
Book Copying
Image Shift
Edge Erase
Features
Invert Image
Basic Copy, Scan, and Fax Output Format
Booklet Creation
Job Status Special Pages
Job tracking menus Annotations
Transparency Separators
Machine Status Page Layout
Information and settings menus Job Assembly
Build Job
Sample Job
Language Save Current Settings
Language and keyboard settings
Retrieve Saved Settings
To Print a Menu Map Reprint Saved Job
Go to: Machine Status/Machine Information/Information Pages/Menu Map
Default Public Folder
Workﬂow Scanning
Workﬂow Scanning
Features All Templates
Copy Output Color
Copy 2-Sided Scanning
Output Color Original Type
Paper Supply Scan Presets
2-Sided Copying Advanced Settings
Copy Output Image Options
Reduce/Enlarge Image Enhancement
Image Quality Resolution
Original Type Quality/File Size
Image Options Update Templates
Image Enhancement More…
Color Presets
Color Balance

*Features in this menu may require an administrator’s login. **WorkCentre6400x/6400FX only s6400mfp-854

WorkCentre 6400 Service Manual A-137

Reference

Menu Map (page 2)

Workﬂow Scanning (continued) **Fax

Layout Adjustment Fax
Original Orientation Enter Number
Original Size Dialing Characters
Edge Erase Address Book
Filing Options Cover Sheet
File Name 2-Sided Scanning
File Format Original Type
If File Already Exists Resolution
Document Management Image Quality
Add File Destinations Image Options
Job Assembly Image Enhancement
Build Job Layout Adustment
E-mail Original Size
Reduce/Split
E-mail
Book Faxing
New Recipient
From Fax Options
Subject Conﬁrmation Report
Output Color Starting Rate
2-Sided Scanning Delay Send
Original Type Send Header Text
Scan Presets Mailboxes
Local Polling
Advanced Settings
Remote Polling
Image Options
Image Enhancement Job Assembly
Resolution Build Job
Quality/File Size **Internet Fax
Layout Adjustment Internet Fax
Original Orientation New Recipient
Original Size From
Edge Erase Subject
E-mail Options Output Color
File Name 2-Sided Scanning
File Format Original Type
Message Advanced Settings
Reply To: Image Options
Job Assembly Image Enhancement
Build Job Resolution
Quality/File Size
More…

*Features in this menu may require an administrator’s login. **WorkCentre6400x/6400FX only

s6400mfp-855

A-138 WorkCentre 6400 Service Manual

Reference

Menu Map (page 3)

**Internet Fax (continued)

Layout Adjustment
Original Orientation
Original Size
Internet Fax Options
File Format
Message
Reply To
Acknowledgement Report
Job Assembly
Build Job
**Server Fax
Server Fax Machine Status
Enter Number Machine Information
Dialing Characters General Information
Fax Directory Customer Support
2-Sided Scanning Device Model
Original Type Machine Seriel Number
Resolution Software version
Image Quality Paper Tray Status
Image Options Information Pages
Image Enhancement Configuration Report
Layout Adjustment Menu Map
Original Orientation Connection Setup Page
Original Size Paper Tips Page
Fax Options Supplies Usage Page
Delay Send Usage Profile
Job Assembly Copying Guide
Build Job Scanning Guide
Faxing Guide
Office Demo Page
Graphics Demo Page
2-Sided Demo Page
CMYK Sampler Pages
RGB Sampler Pages
Spot Color Sampler Pages
PCL Font List
PostScript Font List
Installed Options
Maintenence Assistant

*Features in this menu may require an administrator’s login. **WorkCentre6400x/6400FX only

s6400mfp-856

WorkCentre 6400 Service Manual A-139

Reference

Menu Map (page 4)

Faults *Input
Current Faults Auto Color Detection
Photo/Text Settings
Current Messages
*Output
Fault History Contention Management
Supplies Out of Staples Option
Toner Output Location
All Supplies Within Job Offsetting
*Quick Setup Home
Print Supplies Report
IP Address Settings
Billing Information Contact Numbers
Machine Serial Number Fax Setup
Counters Display Brightness
Usage Counters *Conﬁguration/Information Pages
*Reset to UI Factory Settings
Tools *Interrupt Printing Enablement
Device Settings *Service Settings
*General Copy Service Settings
Energy Saver Feature Defaults
Date and Time Edge Erase Presets
Language/Keyboard Selection Image Shift Presets
Custom Keyboard Button Reduce/Enlarge Presets
Xerox Customer Support Reading Order Options
Entry Screen Defaults Auto Image Rotation
Measurements **Embedded Fax Settings
Paper Size Preferences **Fax Setup
Low Supply Warning **Feature Defaults
Supply Counter Reset **Fax Country Settings
*Paper Management Line 1 Setup
Paper Type & Color Incoming Fax Defaults
Paper Substitution Transmission Defaults
Paper Size Preferences Mailbox & Polling Policies
Standard Size Required Mailbox Setup
Tray Settings **Setup Fax Reports
Tray Contents **Print Fax Reports
*Timers Job Sheets
Auto Resume Timer Banner Sheets
Held Job Timeout Output Error Sheets
System Timeout Paper Type & Color
Custom Keyboard Button
More…

*Features in this menu may require an administrator’s login. **WorkCentre6400x/6400FX only

s6400mfp-857

A-140 WorkCentre 6400 Service Manual

Reference

Menu Map (page 5)

Tools (continued) Troubleshooting

*Network Settings Support Pages
Online/Ofﬂine Troubleshooting Print Quality Page
Remote Software Upgrade Repeating Defects Page
TCP/IP Settings Service Usage Proﬁle
Advanced Settings System Status Page
Network Logs Cyan 50% Fill Test Page
Magenta 50% Fill Test Page
*Accounting Settings
Yellow 50% Fill Test Page
Accounting Mode
Black 50% Fill Test Page
Copy Activity Report
Manufacturing Test Page 1
*Security Settings Manufacturing Test Page 2
Authentication Manufacturing Test Page 3
Image Overwrite Security Calibration
Color Calibration
*Altitude Adjustment
Calibrate Paper Type
*Document Feeder Registration
*Document Glass Registration
Image Position
Image Quality Calibration
*Resets
Software Reset
Supply Counter Reset
Network
Network Echo Test
**Fax
**Fax Protocol Report

*Features in this menu may require an administrator’s login. **WorkCentre6400x/6400FX only

s6400mfp-858

WorkCentre 6400 Service Manual A-141

Reference

Internal Page Samples

2 dot Product: WC6400 2002.5.16

2dot
A d o b e P o s t S c r i p t P a r s e r 2 G 0 J

N3Reg-v3 (Large)

A-157
Reference
Reference

Manufacturing Test Page 2 / Delta-E Print

DeltaE Print

A-158 WorkCentre 6400 Service Manual

Reference

Manufacturing Test Page 3 / Ghosting Print

A A A A A A A A A A A A
A A A A A A A A A A A A
A A A A A A A A A A A A
A A A A A A A A A A A A

20%/20%/20% 60%/60%/60% 80%/80%/80% 20% 60% 100% 20% 60% 100% 20% 60% 100%
Ghosting SEF (Large)

WorkCentre 6400 Service Manual A-159

Reference

Repeating Defects

To identify the component causing

the defect, compare your print sample
against the measurements shown.
37.7 mm / 1.48 in.
69.7 mm / 2.74 in.

58.1 mm / 2.29 in.

94.2 mm / 3.72 in.

40.2 mm / 1.58 in.

34.4 mm / 1.35 in.

157 mm / 6.18 in.
25.1 mm / .99 in.

94.2 mm / 3.7 in.

27.9 mm / 1 in.

Transfer Belt Transfer Roller Fuser Exit Roller Imaging Unit

6400mfp Repeating Defects

A-160 WorkCentre 6400 Service Manual

Reference

Fax Communication Commands Definitions

Acronym Description

ANSam Modulated Answer Tone

CED Called Terminal Identification
CFR Confirmation to Receive
CI Call Indicator
CIG Calling Subscriber Identification
CJ CM Terminator
CM Call Menu
CNG Calling Tone
CRP Command Repeat
CSI Called Subscriber Identification
CTC Continue to Correct
CTR Response for Continue to Correct
DCN Disconnect
DCS Digital Command Signal
DIS Digital Identification Signal
DP Dial Pulse
DRPD Distinctive Ring Pattern Detection
DSL Digital Subscriber Line
DTC Digital Transmit Command
EOM End of Message
EOP End of Procedure
EOR End of Retransmission
EQM Eye quality measurement - Value used to determine line
quality. This field is populated with a hexadecimal
number.
ERR Response for End of Transmission
Fax Facsimile
FTT Failure to Train
IPP Internet Present Provider
IPX Internetwork Packet Exchange
ISDN Integrated Services Digital Network
JM Joint Menu
MCF Message Confirmation
MPS Multiple Signal
NCS Non - Standard Facilities Command

WorkCentre 6400 Service Manual A-161

Reference

ITU-T International Telecommunication Union -

Telecommunication (Standards Organization)
JBA Job-Based Accounting
KB Kilo Byte
LAN Local Area Network
LASDB (Y/M/C/K) Laser Drive Board (Yellow/Magenta/Cyan/Black)
LCD Liquid Crystal Display
LD Laser Diode
LED Light Emitting Diode
LEF Long-Edge Feed
LH Left Hand
LPD Line Printer Daemon
LPR Line Printer Remote
LTR Letter Size Paper (8.5 x 11 inches)
LVDS Low-Voltage Differential Signaling
LVPS Low-Voltage Power Supply
LVPS Cooling Fan DC Power Supply Fan
LVTTL Low-Voltage Transistor Transistor Level
MAC Media Access Control
MB Mega Byte
MCU Machine Control Unit (Engine Control Board)
MFPB Multi-Function Printed Board (MCU Board)
MHz Mega Hertz
MIB Management Information Base
MICR Magnetic Ink Character Recognition
MM Millimeters
MOB Marks On Belt
MOT Motor
MPT Multi-Purpose Tray
NC No Connection
NCS Non-Contact Sensor
NCU Network Control Unit
NPP No Paper
NTP Network Time Protocol
NVM Non-Volatile Memory
NVRAM Non-Volatile Random Access Memory
OEM Original Equipment Manufacturer

A-166 WorkCentre 6400 Service Manual

Reference

Acronym Description

OHP Overhead Paper (Transparency)

OPC Organic Photo Conductor
OPT Optional
OS Operating System
PC Personal Computer
PC Photo Conductor
PC Print Cartridge
PCB Printed Circuit Board
PCCB Printed Circuit Control Board
PCDC Pixel Count Dispense Control
PCL Printer Command Language
PDL Page Description Language
PH Paper Handling
P/J Plug Jack (electrical connections)
PJL Printer Job Language
PL Parts List
POP3 Post Office Protocol version 3
PPA PagePack Assistant
PPD PostScript Printer Description
PPM Pages Per Minute
PQ Print Quality
PPS Pages
PRCB Print Control Board (Image Processor Board)
PU Print Unit
PV Print Volume Management
PWB Printed Wiring Board
PWBA Printed Wiring Board Assembly
RAM Random Access Memory
RET Retard
RF Radio Frequency (RF Protective Shield)
RGB Three primary colors of light - Red Green Blue
RH Relative Humidity
RMI Routine Maintenance Item
RML Recommended Media List
RLS Release
RMS Root Mean Square Voltage

WorkCentre 6400 Service Manual A-167

Reference

Acronym Description

ROM Read-Only Memory

ROS Raster Output Scanner - Laser Unit
RTD Retard
SA Systems Administrator
SEF Short-Edge Feed
SMB Server Message Block
SNMP Simple Network Management Protocol
SNR Sensor
SOC Service Order Code
SOL Solenoid
SOS Start of Scan
STS Soft Touch Sensor
SW Software
TDC Toner Density Control
TLSB Toner Low Sensor Board
TNR Toner
TRNS Transport
UI User Interface
USB Universal Serial Bus
WVGA Wide Video Graphics Array
XML Extensible Markup Language
XUI XML User Interface
ZIF Zero Insertion Force (ZIF Connector)

A-168 WorkCentre 6400 Service Manual

Index

Numerics C
2nd Image Transfer Pressure/Retraction Drive Assembly calibration
part number, 9-30 color, 6-15
removal, 8-136 image quality, 6-13, 6-21
500-Sheet Feeder margin, 6-20
components, 2-113 paper type, 6-12, 6-17
Feed Roller Scanner Assembly, 2-17, 6-23
maintenance items, 1-18 UI, 6-22
part number, 9-99 Card Cage
operation, 2-114 part number, 9-48
part number, 9-62, 9-99 removal, 8-111
plug/jack location, 10-24 cleaning
PWB Control Panel, 7-3
part number, 9-62 Document Glass, 7-17
removal, 8-161 Duplex Unit Feed Rollers, 7-10
removal, 8-166 IDC Sensor, 7-16
wiring diagram, 10-52 Laser Lens, 7-14
printer, 7-2
Tray 1 Feed Roller, 7-6
A Tray 2 Feed Roller, 7-8
Tray 3/4 Feed Roller, 7-8
Tray 3/4 Transport Rollers, 7-12
abbreviation Color Photo Conductor Drum Motor
WorkCentre 6400, A-163 part number, 9-32
AC power removal, 8-155
troubleshooting, 4-58 Control Panel
accessing buttons, 1-9
Service Diagnostics, 6-2 cleaning, 7-3
Tools Menu, 6-2 LCD
acoustic noise part number, 9-12
copying, 1-24 removal, 8-75
printing, 1-24 LED indicators, 1-9
standby, 1-24 part number, 9-12
adjustment PWB
altitude, 6-14, 6-16 part number, 9-12
margin, 6-4 removal, 8-75
Tray 3/4, 6-3 removal, 8-46
altitude shortcuts, 1-9
adjustment, 6-14, 6-16 troubleshooting, 4-53
operating, 1-24 copy
ATVC Control, 2-64 operation, 2-11
specifications, 1-21
Copy Controller, 2-20
B CRUM Reader
part number, 9-20
back channel traces, A-5 removal, 8-119

WorkCentre 6400 Service Manual I–1

D Transport Motor
part number, 9-55
removal, 8-178
DADF wiring diagram, 10-46
cleaning, 7-4
components, 2-8, 2-9
DADF Assembly
part number, 9-10
E
removal, 8-38
Feed Roller Kit electrical
maintenance items, 1-17 specifications, 1-25
part number, 9-10 envelopes
removal, 8-31 supported sizes, 1-34
operation, 2-10
Paper Tray Assembly
part number, 9-10 F
removal, 8-33
Separator Pad Assembly
fans
part number, 9-10
DC Power Supply Fan
removal, 8-40
part number, 9-34
Top Cover Assembly
removal, 8-148
part number, 9-10
Finisher Fan
removal, 8-35
part number, 9-91
wiring diagram, 10-48, 10-49
removal, 8-212
DC power
Fuser Fan
troubleshooting, 4-59
part number, 9-34
DC Power Supply Fan
removal, 8-150
operation, 2-104
wiring diagram, 10-45
part number, 9-34
Horizontal Transport Fan
removal, 8-148
removal, 8-152
Developer
Image Processor Board Cooling Fan
components, 2-49
part number, 9-48
operation, 2-50
removal, 8-153
Developer Motor (K)
LVPS Cooling Fan
part number, 9-32
part number, 9-48
removal, 8-156
Ozone Ventilation Fan
Developer Motors (C/M/Y)
part number, 9-22
part number, 9-32
removal, 8-146
removal, 8-142
fastener types
wiring diagram, 10-41
Posi-Drive screw types, 8-8
Document Glass
precautions, 8-8
cleaning, 7-17
fault codes, A-6
Duplex Unit
summary, 3-6, 3-12
cleaning Feed Rollers, 7-10
Fax
Duplex Control Board
specifications, 1-23
part number, 9-55
troubleshooting, 4-65
removal, 8-177
Fax Board
Motors wiring diagram, 10-46
part number, 9-49
operation, 2-106
removal, 8-115
paper size detection, 2-86
Feed Roller
part number, 9-53
Tray 1
plug/jack location, 10-23
part number, 9-18
removal, 8-175
removal, 8-12
Reverse Motor
Tray 2
part number, 9-53
part number, 9-51
removal, 8-174
removal, 8-27
Right Cover
Tray 3/4
part number, 9-53
part number, 9-70, 9-99
removal, 8-173
removal, 8-29

I–2 WorkCentre 6400 Service Manual

Finisher Roll Assembly
Alignment Belt Up/Down Solenoid part number, 9-82
part number, 9-91 removal, 8-198
removal, 8-204 Roller Assembly
components, 2-121 part number, 9-87
Cover Assembly removal, 8-200
part number, 9-75 Sensors wiring diagram, 10-55
removal, 8-183 storage operation, 2-131
Entrance Sensor Storage Section Sensor
part number, 9-79 part number, 9-83
removal, 8-189 removal, 8-199
Entrance Solenoid Switch Assembly
part number, 9-81 part number, 9-77
removal, 8-196 removal, 8-187
Exit Motor Top Cover Assembly
part number, 9-91 part number, 9-79
removal, 8-209 Top Right Cover
Exit Roller Up/Down Motor part number, 9-79
part number, 9-93 removal, 8-188
removal, 8-213 Top Tray
Fan operation, 2-123, 2-126
part number, 9-91 part number, 9-79
removal, 8-212 removal, 8-191
features, 1-15 Transport Motor
Finisher Assembly part number, 9-91
part number, 9-73, 9-99 removal, 8-206
removal, 8-182 wiring diagram, 10-54
Finisher Control Board firmware update, 1-35, A-2
part number, 9-91 Foreign Device Interface
removal, 8-205 features, 1-16
Front Cover part number, 9-99
part number, 9-73 Front Door Assembly
removal, 8-180 part number, 9-14
Guide Assembly removal, 8-51
part number, 9-79 Front Imaging Unit Holder
removal, 8-195 part number, 9-26
Main Tray removal, 8-124
components, 2-142 Fuser Fan
operation, 2-124, 2-129 operation, 2-104
part number, 9-95 part number, 9-34
removal, 8-216 removal, 8-150
Neutralizing Brush Assembly wiring diagram, 10-45
part number, 9-79 Fuser Motor
removal, 8-190 part number, 9-32
operation, 2-122 removal, 8-158
Paper Exit Assembly wiring diagram, 10-45
part number, 9-79 Fuser Pawl
removal, 8-192 part number, 9-44
Paper Level Sensor removal, 8-71
part number, 9-75 Fuser Unit
removal, 8-185 components, 2-89
plug/jack location, 10-25 maintenance items, 1-17
Rear Cover operation, 2-91
part number, 9-73 part number, 9-44, 9-98
removal, 8-179 removal, 8-24
Right Plate temperature control, 2-93
part number, 9-77 wiring diagram, 10-40
removal, 8-186

WorkCentre 6400 Service Manual I–3

H Image Quality Control, 2-101
Image Stabilization, 2-101
Imaging Unit
Hard Drives components, 2-44
features, 1-8 maintenance items, 1-17
part number, 9-48 operation, 2-44
removal, 8-91 part number, 9-20, 9-98
wiring diagram, 10-39 removal, 8-17
Hopper Drive Assembly in-rush current, 1-25
part number, 9-34 Intermediate Transport Motor
removal, 8-144 part number, 9-32
Horizontal Transport removal, 8-157
components, 2-97 internal pages
Cooling Fan Black 50% Fill, A-156
operation, 2-104 Copy Activity Report, A-144
Lower Cyan 50% Fill, A-153
part number, 9-43 Delta-E Print, A-158
removal, 8-69 Fax Activity Report, A-145
operation, 2-98 Fax Dial Directory Report, A-148
Upper Fax Group Directory Report, A-149
part number, 9-42 Fax Options Report, A-150
removal, 8-68 Fax Pending Jobs Report, A-152
humidity Fax Protocol Report, A-146
operating, 1-24 Ghosting Print, A-159
storage, 1-24 Graphics Demo Page, A-142
HVPS-1 Magenta 50% Fill, A-154
part number, 9-48 Manufacturing Test Page 1, A-157
plug/jack location, 10-19 Manufacturing Test Page 2, A-158
removal, 8-106 Manufacturing Test Page 3, A-159
wiring diagram, 10-36 Menu Map, A-137
HVPS-2 Office Demo Page, A-143
part number, 9-48 Registration Print, A-157
plug/jack location, 10-20 Repeating Defects, A-160
removal, 8-109 Service Diagnostics Menu Map, 4-8
wiring diagram, 10-37 support pages, 1-41
Yellow 50% Fill, A-155

I
L
IDC Sensor
cleaning, 7-16 Laser Lens
operation, 2-78 cleaning, 7-14
part number, 9-36 Cleaning Tool
removal, 8-87 part number, 9-14
wiring diagram, 10-44 Laser Unit
Image Processor Board components, 2-26
Back Panel operation, 2-25
part number, 9-48 part number, 9-28
Cooling Fan removal, 8-126
operation, 2-104 leakage current, 1-25
part number, 9-48 Left Side Cover
removal, 8-153 part number, 9-14
wiring diagram, 10-39 removal, 8-52
NVRAM Chip level detection
part number, 9-49 Toner Cartridge, 2-29
operation, 2-19 Waste Cartridge, 2-43
part number, 9-48 Lower Horizontal Transport
plug/jack location, 10-21 part number, 9-43
removal, 8-98 removal, 8-69
wiring diagram, 10-35

I–4 WorkCentre 6400 Service Manual

LVPS Tray 3/4
Cooling Fan Separation Roller Assembly
part number, 9-48 removal, 8-26
Horizontal Transport Fan Tray 3/4 Feed Roller
removal, 8-152 part number, 9-70, 9-99
part number, 9-28 removal, 8-29
plug/jack location, 10-18 Tray 3/4 Separation Roller Assembly
removal, 8-82 part number, 9-70
troubleshooting, 4-59 removal, 8-26
wiring diagram, 10-38 Waste Cartridge, 1-17, 8-19
part number, 9-26
MCU Board
M operation, 2-24
part number, 9-48
plug/jack location, 10-22
Macintosh removal, 8-101
operating system, 1-19 wiring diagram, 10-34
troubleshooting, 4-73 Memory
Main Drive Assembly maximum, 1-23
part number, 9-32 minimum, 1-23
removal, 8-142 part number, 9-99
maintenance removal, 8-117
preventive, 7-2 specifications, 1-23
RIP, 7-19 supported types, 1-23
tools, 7-2 menu map
maintenance items Service Diagnostics, 4-8
500-Sheet Feeder Feed Roller, 1-18 WorkCentre 6400, A-137
DADF Feed Roller Kit, 1-17 motors
removal, 8-31 Color Photo Conductor Drum Motor
Fuser Unit, 1-17 part number, 9-32
part number, 9-44 removal, 8-155
removal, 8-24 wiring diagram, 10-41
Imaging Unit, 1-17 Developer Motor (K)
part number, 9-20, 9-98 part number, 9-32
removal, 8-17 removal, 8-156
Ozone Filter, 1-17 wiring diagram, 10-41
part number, 9-22, 9-99 Duplex Transport Motor
removal, 8-18 part number, 9-55
Toner Cartridge, 1-17 removal, 8-178
non-Xerox Toner Cartridge, 1-35 wiring diagram, 10-46
part number, 9-20, 9-98 Duplex Unit Reverse Motor
removal, 8-15 part number, 9-53
Transfer Belt, 1-17 removal, 8-174
part number, 9-99 wiring diagram, 10-46
removal, 8-20 Finisher Exit Motor
Transfer Roller, 1-17 part number, 9-91
part number, 9-40, 9-98 removal, 8-209
removal, 8-23 wiring diagram, 10-54
Tray 1 Feed Roller, 1-17 Finisher Exit Roller Up/Down Motor
part number, 9-18, 9-99 part number, 9-93
removal, 8-12 removal, 8-213
Tray 1 Separation Roller Assembly wiring diagram, 10-54
part number, 9-18 Finisher Transport Motor
removal, 8-9 part number, 9-91
Tray 2 Feed Roller, 1-17 removal, 8-206
part number, 9-99 wiring diagram, 10-54
removal, 8-27 Fuser Motor
Tray 2 Separation Roller Assembly part number, 9-32
part number, 9-51 removal, 8-158
removal, 8-26 wiring diagram, 10-45

WorkCentre 6400 Service Manual I–5

Intermediate Transport Motor PWB
part number, 9-32 part number, 9-62
removal, 8-157 removal, 8-161
wiring diagram, 10-46 removal, 8-166
Toner Supply Motor (C/K) wiring diagram, 10-52
part number, 9-34 options
removal, 8-160 500-Sheet Feeder
wiring diagram, 10-43 part number, 9-62
Toner Supply Motor (Y/M) removal, 8-166
part number, 9-34 500-Sheet Feeder PWB
removal, 8-159 removal, 8-161
wiring diagram, 10-43 Finisher Assembly
Tray 3/4 Transport Motor part number, 9-73, 9-99
part number, 9-66 Printer Stand
removal, 8-171 part number, 9-97, 9-99
wiring diagram, 10-52 Tray 3/4
part number, 9-68
output tray, 1-2
N Ozone Filter
maintenance items, 1-17
part number, 9-22, 9-99
network removal, 8-18
Macintosh troubleshooting, 4-73 Ozone Ventilation
UNIX troubleshooting, 4-74 operation, 2-53
Windows troubleshooting, 4-72 Ozone Ventilation Fan
Network Controller, 2-22 operation, 2-104
non-Xerox Toner Cartridge, 1-35 part number, 9-22
NVM Module removal, 8-146
part number, 9-49
removal, 8-116
NVM value, A-78
clearing, 6-6 P
copy, 6-10
initialization, 6-7 Packaging Kit
read/write, 6-5 part number, 9-97
reading, 6-5 paper
save and restore, 6-8 supported sizes, 1-33
supported types and weights, 1-33
Paper Exit Assembly
O part number, 9-46
removal, 8-72
paper feed
OHP Sensor tray 1 operation, 2-65
part number, 9-30 tray 2 operation, 2-71
removal, 8-86 paper path
wiring diagram, 10-43 process, 2-7
operating systems paper size detection, 2-86
specifications, 1-19 Paper Take-Up Drive Assembly
troubleshooting, 4-72 part number, 9-32
Optional 500-Sheet Feeder removal, 8-139
components, 2-113 power consumption, 1-25
Feed Roller Power Cord
part number, 9-99 part number, 9-60, 9-99
operation, 2-114 Power On Self Test (POST)
part number, 9-62, 9-99 process, 4-4
plug/jack location, 10-24 power requirements, 1-25
Pressure/Retraction Clutch-1
part number, 9-32
removal, 8-59
Pressure/Retraction Sensor 2
part number, 9-30
removal, 8-135

I–6 WorkCentre 6400 Service Manual

print volume, 1-19 resources, 4-75
printer RF Protective Shield
configurations, 1-3 part number, 9-48
dimensions, 1-30 removal, 8-97
options, 1-13 Right Front Cover
print speed, 1-26 part number, 9-14
printing life, 1-19 removal, 8-50
serial number, 9-2 Right Rear Cover
specifications, 1-19 part number, 9-14
technology, 1-19 removal, 8-48
Printer Stand
features, 1-13
part number, 9-97, 9-99 S
removal, 8-217
printing process, 2-6
print-quality Scanner Assembly
list of defect, 5-22 calibration, 2-17, 6-23
mode, 1-19 components, 1-7, 2-17
repeating defect, 5-24 diagram, 10-50
specifications, 5-21 operation, 2-15
part number, 9-12
removal, 8-42
technology, 1-20
R wiring diagram, 10-51
scanning
RAM specifications, 1-20
part number, 9-49, 9-99 Separation Roller
removal, 8-117 Tray 2
Rear Cover part number, 9-51
part number, 9-14 Tray 3/4
removal, 8-47 part number, 9-70
Rear Cover Access Door Separation Roller Assembly
part number, 9-48 Tray 1
Rear Imaging Unit Holder part number, 9-18
part number, 9-26 removal, 8-9
removal, 8-125 Tray 2
Registration Clutch removal, 8-26
part number, 9-40 Tray 3/4
removal, 8-63 removal, 8-26
Registration Roller Separation Roller Clutch
components, 2-81 Tray 2
operation, 2-82 part number, 9-51
Registration Roller Assembly removal, 8-73
part number, 9-40 Separator Pad Assembly
removal, 8-65 part number, 9-10
Registration Sensor serial number
part number, 9-30 format, 9-2
removal, 8-85 location, 9-3
wiring diagram, 10-43 Service Diagnostics
reports, 1-40 accessing, 4-7, 6-2
Broadcast & Multipoll Report, 1-40 menu map, 4-8
Copy Activity Report, 1-40, A-144 Service Kit, 9-100
Fax Acknowledgement Report, 1-40 Hardware Kit
Fax Activity Report, 1-40, A-145 part number, 9-100
Fax Confirmation Report, 1-40 Repack Kit
Fax Dial Directory Report, 1-41, A-148 part number, 9-101
Fax Group Directory Report, 1-41, A-149 Tools
Fax Options Report, 1-41, A-150 part number, 9-101
Fax Pending Job Report, 1-41 servicing instructions, 3-4
Fax Pending Jobs Report, A-152 skew
Fax Protocol Report, 1-41, A-146 troubleshooting, 5-69

WorkCentre 6400 Service Manual I–7

specifications Transfer Roller
copy, 1-21 maintenance items, 1-17
electrical, 1-25 operation, 2-60
environmental, 1-24 part number, 9-40, 9-98
Fax, 1-23 removal, 8-23
Memory, 1-23 Tray 1
mounting surface, 1-31 cleaning Feed Roller, 7-6
paper and tray, 1-33 Feed Roller
printer, 1-19 maintenance items, 1-17
print-quality, 5-21 part number, 9-99
scanning, 1-20 removal, 8-12
Stapling Unit operation, 2-65
components, 2-147 paper size detection, 2-86
operation, 2-148 part number, 9-18
part number, 9-89 removal, 8-53
removal, 8-201 Separation Roller Assembly
status codes, A-64 part number, 9-18
system startup, 4-2 removal, 8-9
Tray 2
cleaning Feed Roller, 7-8
T Feed Roller
maintenance items, 1-17
part number, 9-51, 9-99
technical support, 1-2 removal, 8-27
temperature operation, 2-71
operating, 1-24 Paper Empty Sensor
storage, 1-24 part number, 9-26
Temperature/Humidity Sensor removal, 8-56
part number, 9-30 Paper Empty Sensor Actuator
removal, 8-84 part number, 9-26
wiring diagram, 10-44 removal, 8-57
Toner Cartridge Paper Size Actuator
maintenance items, 1-17 part number, 9-22
non-Xerox Toner Cartridge, 1-35 removal, 8-55
operation, 2-29 paper size detection, 2-86
part number, 9-20, 9-98 Paper Size Sensor
removal, 8-15 part number, 9-22
Toner Low Sensor Board removal, 8-54
part number, 9-20 part number, 9-51
removal, 8-79 removal, 8-58
wiring diagram, 10-42 Separation Roller Assembly
Toner Supply Motor (C/K) part number, 9-51
part number, 9-34 removal, 8-26
removal, 8-160 Separation Roller Clutch
wiring diagrams part number, 9-51
Toner Supply Motors (C/M/Y/K), 10-43 removal, 8-73
Toner Supply Motor (Y/M) Tray 3/4
part number, 9-34 adjustment, 6-3
removal, 8-159 cleaning Feed Roller, 7-8
wiring diagram, 10-43 cleaning Transport Rollers, 7-12
Tools Menu Feed Roller
accessing, 6-2 part number, 9-70, 9-99
Transfer Belt removal, 8-29
components, 2-54 Paper Feed Clutch
maintenance items, 1-17 part number, 9-66
operation, 2-55 removal, 8-169
part number, 9-36, 9-99 Paper Feed Sensor Actuator
removal, 8-20 part number, 9-64
removal, 8-168
paper size detection, 2-86

I–8 WorkCentre 6400 Service Manual

Paper Size Switch
part number, 9-62
V
removal, 8-165
Paper Size Switch Actuator Vertical Transport Assembly
part number, 9-62 part number, 9-38
removal, 8-163 removal, 8-61
part number, 9-68
removal, 8-172
Separation Roller Assembly W
part number, 9-70
removal, 8-26
warm-up time, 1-19
Transport Motor
Waste Cartridge
part number, 9-66
maintenance items, 1-17
removal, 8-171
operation, 2-37
wiring diagram, 10-53
part number, 9-26
troubleshooting
removal, 8-19
AC Power Supply, 4-58
Waste Toner Auger Assembly
checklist, 5-7
part number, 9-24
Control Panel, 4-53
removal, 8-123
DC Power Supply, 4-59
Windows
Fax, 4-65
operating system, 1-19
Fusing Heaters, 4-56
troubleshooting, 4-72
Image Processor Board, 4-60
wiring diagrams
inoperable printer, 4-56
500-Sheet Feeder, 10-52
LVPS, 4-59
DADF, 10-48, 10-49
Macintosh, 4-73
Developer Motors, 10-41
operating system, 4-72
Duplex Unit, 10-46
print-quality, 5-2
Duplex Unit Motors, 10-46
Scanner, 4-63
Finisher, 10-54
UNIX, 4-74
Finisher Sensors, 10-55
Windows, 4-72
Fuser Fan, 10-45
Fuser Motor, 10-45
Fuser Unit, 10-40
U general, 10-30
Hard Drives, 10-39
UI HVPS-1, 10-36
wiring diagram, 10-39 HVPS-2, 10-37
UNIX IDC Sensor, 10-44
operating system, 1-19 Image Processor Board, 10-35
troubleshooting, 4-74 Image Processor Board Cooling Fan, 10-39
Upper Horizontal Transport LVPS, 10-38
part number, 9-42 MCU Board, 10-34
removal, 8-68 OHP Sensor, 10-43
Optional 500-Sheet Feeder, 10-53
Registration Sensor, 10-43
Scanner Assembly, 10-50, 10-51
Temperature/Humidity Sensor, 10-44
Toner Low Sensor Board, 10-42
Tray 3/4, 10-53
UI, 10-39

WorkCentre 6400 Service Manual I–9

Part#: 701P50229

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