ThinkPad 750 / 755 (and 370C)

The 750 and 755 lines represent IBM's flagship multimedia notebooks of the mid-90s, featuring advanced audio and video.

The following tables show a brief overview of the system features.

Models 355x, 360x

Feature	Description
Processor	° 355x, 360, 360C, 360Cs, 360P SL Enhanced 486SX 33 MHz, solder mounted on the system board ° 360CE, 360CSE, 360PE SL Enhanced 486DX2 50/25 MHz on the system board
Bus Architecture	° AT Bus ° VESA Local Bus for video subsystem
Memory (Standard)	4MB (on the system board)
Memory (Option)	2, 4, 8, 16MB, Basic IC DRAM card (max. 16 MB)
CMOS RAM	128 Bytes
VGA Video	° 355, 360 - 9.5-inch (diagonally), 64 gray level STN LCD monochrome ° 355Cs, 360Cs, 360CSE, 360P, 360PE - 9.5-inch (diagonally), 256/4096 color, DSTN LCD color ° 355C, 360C, 360CE - 8.4-inch (diagonally), 256/256K color, TFT LCD color
Diskette Drive (Removable)	0.720, 1.2, 1.44MB (3-mode), 3.5-inch
Hard Disk Drive (Removable)	° 355x - 125MB, 2.5-Inch - 250MB, 2.5-Inch ° 360x - 170MB, 2.5-Inch - 340MB, 2.5-Inch
Audio Card	° Standard (360PE) ° Option (other Model 360x)
Internal Modem Card	° Standard (355x) ° Option (360x)
PCMCIA	° 360x - One Type-III or Two Type-II ° 355x - One Type-III or Type-II

Model 370C

Feature	Description
Processor	Intel® DX4 75MHz on the system board
Bus Architecture	° AT Bus ° VESA Local Bus for video subsystem
Memory (Standard)	4MB (on the system board)
Memory (Option)	° 2, 4, 8, 16MB, Basic IC DRAM card (max. 16 MB) ° 4, 8, 16MB, DIMM card (max. 32MB) ° DIMM card adapter
CMOS RAM	128 Bytes
VGA Video	° 10.4-inch (diagonally), 256/256K colors TFT LCD color
Diskette Drive (Removable)	° 0.720, 1.2, 1.44MB (3-mode), 3.5-inch
Hard Disk Drive (Removable)	° 340MB, 2.5-inch ° 540MB, 2.5-inch ° 810MB, 2.5-Inch
Audio Card	Standard in Japan and European countries.
PCMCIA	One Type-III or two Type-II

Model 750x

Feature	Description
Processor	° 750x - 486SL 33MHz, solder mounted on the system board ° 750Ce - SL Enhanced 486DX2 50MHz on the processor card
Bus Architecture	° AT Bus ° VESA Local Bus for video subsystem (750Ce)
Memory (Standard)	4MB (on the system board)
Memory (Maximum)	2, 4, 8, 16MB, IC DRAM card (max. 20 MB)
CMOS RAM	° 750x - 256 Bytes ° 750Ce - 256 Bytes
VGA Video	° 750 - 9.5-inch (diagonally), 64 gray level STN LCD monochrome ° 750C, 755Ce - 10,4-inch (diagonally), 256 color, TFT LCD color ° 750Cs - 9.5-inch (diagonally), 256 color, STN LCD color ° 750P - 9.5-inch (diagonally), 64 gray level STN LCD monochrome
Diskette Drive (Removable)	0.720, 1.2, 1.44, 2.88MB (4-mode) 3.5-inch
Hard Disk Drive (Removable)	° 170MB, 2.5-inch ° 340MB, 2.5-inch
Audio Card	Standard
PCMCIA	One Type-III or Two Type-II

Models 755C, 755Cs

Feature	Description
Processor	° SL Enhanced 486DX2 50MHz on the system board ° 486DX4 75MHz on the processor card
Bus Architecture	° AT Bus ° VESA Local Bus for video subsystem
Memory (Standard)	4MB (on the system board)
Memory (Option)	° 2, 4, 8, 16MB, IC DRAM card (max. 16 MB) ° 4, 16MB, DIMM card (max. 32 MB) ° DIMM card adapter
CMOS RAM	128 Bytes
VGA Video	° 755C - 10.4-inch (diagonally), 256/256K color, TFT LCD color ° 755Cs - 9.5-inch (diagonally), 256/4096 color, DSTN LCD color
Diskette Drive (Removable)	° 0.720, 1.2, 1.44MB (3-mode), 3.5-inch ° 0.720, 1.2, 1.44, 2.88MB (4-mode), 3.5-inch
Hard Disk Drive (Removable)	° 170MB, 2.5-inch ° 340MB, 2.5-Inch ° 540MB, 2.5-Inch
Audio Card	Microphone and headphone jacks with built in microphone
PCMCIA	One Type-III or two Type-II

The 750 and 755 lines represent IBM's flagship multimedia notebooks of the mid-90s, featuring advanced audio and video.

This section provides information about the following:

• Memory Checkout
• System Board and Processor Checkout (370C, 750Ce, 755C, 755Cs)
• Keyboard / Auxiliary Input Device Checkout
• TrackPoint II Checkout
• Pen and Digitizer Checkout (360P, 360PE, 750P)
• Audio Card Checkout
• Diskette Drive Test
• Power Systems Checkout
• Power Management Features

Use the following procedure as a guide for computer problems.

NOTE: The diagnostic tests are intended to test only IBM products . Non-IBM products, prototype cards, or modified options can give false errors and invalid system responses.

1. Obtain the failing symptoms in as much detail as possible.

2. Verify the symptoms by attempting to recreate the failure by  running the diagnostic test or by repeating the same operation.

   NOTE: To run the diagnostics, refer to 'How to Run the Diagnostics'

   • Use the following table with the verified symptom to determine  which page to go to. Search the symptoms column  and find the description  that best matches your symptom, then go to the page shown in the Go to column.

Symptom	Go to
Power failure. (The power indicator does not go on or stay on.)	'Power Systems Checkout'
POST does not complete. No beeps/error code are indicated.	'Symptom-to-FRU Index' , and then use the 'No Beep Symptoms' table.
POST beeps, but no error codes are displayed.	'Symptom-to-FRU Index' , and then use the 'Beep Symptoms' table.
POST detected an error and displayed numeric error codes.	'Symptom-to-FRU Index' , and then use the 'Numeric Error Codes' table.
The diagnostic test detected an error and displayed an FRU code.	'FRU Codes'
The configuration is not the same as the installed devices.	'Checking the Installed Devices List'
Other symptoms (such as LCD display problems).	'Symptom-to-FRU Index' , and then use 'Other Miscellaneous symptoms' tables.
Symptoms cannot be recreated. (Intermittent problems.)	Use the customer reported symptoms and go to 'Symptom-to-FRU Index'
TV Tuner Problems	See 'TV Tuner'

Use either the TrackPoint II or the cursor move keys to interact with the tests. The Enter key works the same as selecting the OK icon to reply OK.

1. Press and hold the F1 key, then power-on the computer.  Hold the F1 key down until Easy-setup screen appears.
2. Select Test and press Enter.
3. Select a device and press Enter to run the test.
4. The test progress screen appears.
5. OK appears when the test ends without any errors.
6. Start the Advanced Diagnostic test by pressing Ctrl+A on the basic diagnostic menu screen.
7. Select Tool to install the tools.
8. Select a device, press the space key, and  install the tool. Multiple devices can be selected by repeating  this step. A OK mark appears for the selected device.
9. Select OK and press Enter if the selection is OK.
10. Select a device and press Enter to start the tests.
11. Select Test All to test all devices.
12. Select Loop Test to loop tests. A loop option menu appears in which a device loop or all loop can be selected. Select a device and press the space key to select a device. Repeat this step to select multiple devices. Press Enter to start the diagnostic loop. If no device is selected, all device tests are looped.
13. To exit the loop, keep pressing Ctrl+Pause until the test exits. A beep sounds (750Ce, 755C, 755Cs) to notify that the exit interrupt is sensed by the test program.

Do the following to run the keyboard test.

1. Go to the advanced diagnostic screen menu by pressing Ctrl+A in Easy-Setup menu.
2. Go to the keyboard diagnostic test menu by pressing Ctrl+K .
3. Check that when each key is pressed, the key position on the  keyboard layout on the screen changes to be a black square.

NOTE: When a Fn key is pressed, the black square briefly appears.

This section provides information about the following:

Numeric Error Codes <<-- Error Codes

The Symptom-to-FRU Index lists the symptoms and errors and the possible causes. The most likely cause is listed first.

NOTE: Perform the FRU replacement or actions in the sequence shown in the “FRU/Action“ columns. If a FRU did not solve the problem, put the original part back in the computer.

This index can also be used to help you decide which FRUs to have available when servicing a computer.

'Numeric error codes' show the errors detected in POST or system operation. In the following error codes, X can be any number.

If no codes are available, use narrative symptoms.

If the symptom is not listed, go to 'Undetermined Problems'

NOTE:

• For IBM devices not supported by the diagnostic codes  in this manual,  see the manual for that device.
• If the LCD is replaced with a new one,  see 'Digitizer Adjustment' to adjust the pen-point pressure.

Symptom/Error	FRU/Action
10 X	1. System Board
110	1. Go to 'Memory Checkout' 2. IC DRAM Card or DIMM Card 3. System Board
111	1. Go to 'Memory Checkout' 2. Expansion Unit/Port Replicator 3. System Board
118 (Memory parity error was logged in CMOS.) (Go to 'Memory Checkout' )	1. Run memory diagnostics to clear the error log.
158 (HDP was not set even though the supervisor password is set.)	1. Set a HDP.
159 (HDP is not set the same as the supervisor password.)	1. Set a correct HDP.
161	1. Go to 'Checking the Backup Battery' 2. Backup Battery 3. System Board
163 (Time and Date was not set.)	1. Set Time and Date. 2. System Board
173 (Configuration data were lost.)	1. Select OK in the error screen, then set time and date 2. Backup Battery 3. System Board
174 (Perform 'Checking the Installed Devices List' before changing any FRUs.)	1. Check Device Configuration. 2. System Board 3. Diskette Drive Assembly 4. Hard Disk Drive Assembly
175, 177, 178	1. System Board
183 (Incorrect password entered at the supervisor password prompt.)	1. Have the user examine the password.
184 (POP checksum error.)	1. Reset the POP in Easy-Setup.
185 (The startup sequence is not valid. Suspect that power was off when the startup sequence was being updated.)	1. Reset the startup sequence in Easy-Setup.
186	1. System Board
188	1. Set the system identification using the ThinkPad 750Ce hardware maintenance diskette. NOTE: You can use this maintenance diskette for all Models.
190 (Depleted battery pack was installed when the power was on.)	1. Go to 'Checking the Battery Pack'
191 XX	1. System Board 2. Processor card (370C, 750Ce, 755C, and 755Cs)
195 (The configuration read from the hibernation area does not match the actual configuration.)	1. Check if the configuration was changed. For example, check if the disk drive from another computer.
196 (Read error occurred in the hibernation area of the HDD.)	1. Run the hard disk drive test. 2. Hard Disk Drive
197 (The computer memory size is not equal to the hibernation area size on the HDD.)	1. Have the user disable then enable hibernation mode.
199 XX	1. System Board
1 XX	1. System Board
2 XX	1. Go to 'Memory Checkout' 2. IC DRAM Card, DIMM, or DIMM Adapter 3. System Board
301, 303, 304, 305, 3 XX	1. Go to 'Keyboard/Aux. Inp.-Device Checkout' 2. Keyboard 3. Interposer Card 4. External Numeric Keypad 5. External Keyboard 6. Keyboard/Mouse Cable 7. System Board
601, 6 XX	1. Go to 'Diskette Drive Test' 2. Diskette Drive Assembly 3. Diskette 4. System Board
602 (Diskette read error.)	1. Go to 'Diskette Drive Test' 2. Diskette 3. Diskette Drive Assembly
604 (Non-acceptable ID was read from the diskette drive.)	1. Go to 'Diskette Drive Test' 2. Diskette Drive Assembly 3. System Board
11 XX	1. Serial Device (First) 2. Communication Cable 3. System Board
12 XX	1. Serial Device (Second) 2. Communication Cable 3. System Board
17 XX	1. Hard Disk Drive 2. System Board
24 XX	1. System Board
4101	1. Reseat the LCD connector Pen see '2070 LCD Assembly' 2. LCD Assembly 3. System Board
808 X	1. PCMCIA Slot Assembly 2. PCMCIA Device 3. System Board
860 X (Pointing device error when TrackPoint II is disabled.)	1. External Mouse 2. External Keyboard 3. System Board
861 X (Pointing device error when TrackPoint II is enabled.)	1. Reseat the keyboard Track Point II cable at the interposer card 355x, 360x See '1040 Keyboard Unit' 370C, 750x, 755C, 755Cs See '2040 Keyboard Unit' 2. Keyboard 3. External Mouse 4. System Board
I9990301	1. Reseat the boot device.
I9990302	2. Check the startup sequence for the
I9990305	correct boot device. 3. Check that operating system has no failure, or is installed correctly.
I9990303	1. System Board
Other codes not listed above	1. Go to 'Undetermined Problems'

If an error is detected by the diagnostic tests, a four-digit FRU code is displayed. The FRU code indicates two suspected FRUs. Replace the FRU that is indicated by the two leftmost digits first, then replace the FRU indicated by the two rightmost digits No FRU is assigned to code 00. If only one FRU is suspected, the other FRU code is filled with zeros. See the referenced page before replacing the FRU.

FRU Code	FRU / Action
10	System Board
11	Processor Card (370C, 750Ce, 755C, and 755Cs)
15	Audio Card
20	Memory (See 'Memory Checkout' )
30	Reserved
32	External Keyboard
33	External Mouse
40	LCD Assembly (See 'Digitizer Adjustment' and important (note for 'LCD Related Symptoms')
45	External CRT
50	Reseat the Drive (FDD-1) Diskette Drive (FDD-1)
51	Reseat the Drive (FDD-2) Diskette Drive (FDD-2)
60	Reseat the Hard Disk Drive (HDD-1) Hard Disk Drive (HDD-1)
61	Reseat the Hard Disk Drive (HDD-2) Hard Disk Drive (HDD-2)
70	PCMCIA-2 (Replicator)
80	Cellular Modem (370C, 750Ce, 755C, and 755Cs)
81	Internal Modem Card
90	Reserved

NOTE: The device ID and error codes are used to indicate the detail portion of the FRU which caused the error. If replacing a FRU does not correct a problem, see the Device ID or error code from the previous failure. If they have changed, the cause might be because the new FRU is defective or that the FRU was incorrectly installed.

If the problem remains after replacement of the FRUs, go to 'Undetermined Problems'

Symptom/Error	FRU/Action
No beep, power-on indicator not on and a blank LCD during POST.	1. Go to 'Power Systems Checkout' 2. System Board 3. DC/DC Card 4. Power sources
No beep, power-on indicator on, and a blank LCD during POST.	1. System Board 2. DC/DC Card 3. Processor Card (370C, 750Ce, 755C, 755Cs)
No beep, power-on indicator on, and a blinking cursor only during POST.	1. System Board 2. Processor Card (370C, 750Ce, 755C, and 755Cs) 3. DC/DC Card
No beep during POST but system runs correctly	1. Turn the volume up and check the speaker 2. Speaker 3. Audio Card 4. DC/DC Card

Symptom/Error	FRU/Action
Continuous beeps.	System Board
One beep and a blank unreadable, or flashing LCD.	1. Reseat all LCD connectors 2. LCD Assembly 3. System Board 4. DC/DC Card
One beep, and the message 'Unable to access boot source'	1. Boot device 2. System Board
One long, two short beeps and a blank or unreadable LCD.	1. System Board 2. LCD Assembly
One long beep followed by four short beeps each time the power switch is operated. (System cannot power-on due to low battery voltage.)	Connect the AC Adapter or install a fully-charged battery.
One beep every second. (System is shutting down due to low battery voltage.)	Connect the AC Adapter or install a fully-charged battery (allows system to complete shutdown before changing the battery)
Two short beeps with error codes.	POST error. See 'Numeric Error Codes'
Two short beeps with blank screen.	System Board

Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect such as: cosmic radiation, electrostatic discharge, or software errors. FRUs replacement should only be considered when a recurring problems exits.

When analyzing the intermittent problem, do the following:

1. Run the advanced diagnostic test for the system board in loop mode  at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code.  Rerun the test to verify that no more errors exist.

FRU Removals and Replacements

Removals - Models 355x, 360x

Removals - Models 370C, 750x, 755C, 755Cs

This section contains information about removals and replacements.

• The system board is sensitive to, and can

be damaged by, electrostatic discharge. Establish personal grounding
by touching a ground point with one hand before touching these units.

An electrostatic discharge (ESD) strap must be used to establish
personal grounding.

• Do not damage any part. Only certified trained personnel  should service the computer.
• The arrows in the “Removals and Replacements“ section show  the direction of movement to remove a FRU, or to turn a screw to release  the FRU. The arrows are marked in numeric order, in square callouts, to  show the correct sequence of removal.
• When other FRUs must be removed before removing the failing FRU,  they are listed at the top of the page.
• To replace a FRU, reverse the removal procedure and follow any  notes that pertain to replacement. See 'Locations' for internal  cable connections and arrangement information.
• When replacing a FRU, use the correct screw size as shown in the  procedures.

Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the battery pack, and then disconnect any interconnecting cables.

The battery pack contains small amounts of nickel. Do not disassemble it, throw it into fire or water, or short-circuit it. Dispose of the battery pack as required by local ordinances or regulations.

Before the computer is powered-on after FRU replacement, make sure all screws, springs, or other small parts, are in place and are not left loose inside the computer. Verify this by shaking the computer and listening for rattling sounds. Metallic parts or metal flakes can cause electrical shorts.

Removals Models 355x, 360x

Removals Models 370C, 750x, 755C, 755Cs

System - Front View ( 750 , 750Cx, 755Cx, 370C, 360x, 355x)

System - Front View (750P, 360P, 360PE)

System Rear View - All Models

System Board (Top View)

System Board (Bottom View)

Processor Card (370C, 750Ce, 755C, 755Cs)

DC / DC Card - Top View

Interposer Card - All Models (Front View)

System - Front View (750, 750Cx, 755Cx, 370C, 360x, 355x)

1. LCD

2. Contrast Control

   NOTE: The Model 360 does not have a contrast control.

   The Model 755C has one of two types of LCD:

   one with a contrast control and one without.

   • Brightness Control

   • Status Indicator

     See 'Status Indicators'

     • External Input Device Connector
     • PCMCIA Slot
     • PCMCIA Release Lever
     • Keyboard
     • LCD and Keyboard Latch
     • TrackPoint II
     • Click Button
     • Diskette-Eject Button
     • Diskette Drive
     • Fn Key

System Front View - (750P, 360P, 360PE)

1. Convertible LCD
2. Contrast Control
3. Brightness Control
4. Status Indicator
5. External Input Device Connector
6. PCMCIA Slot
7. PCMCIA Release Lever
8. Keyboard
9. LCD and Keyboard Latch
10. Hard Disk Drive Compartment
11. Battery Compartment
12. Click Buttons
13. Diskette-Eject Button
14. Diskette Drive
15. Fn Key
16. TrackPoint II
17. Stylus Pen

Common Parts Listing

This section contains FRUs common to most IBM portable, laptop, and notebook computers.

External Diskette Drives

5.25-Inch Diskette Drives:
360KB External (4869- 001 )	72X6759
360KB External (4869- 501 )	72X6768
1.2MB External (4869- 002 )	15X7993
1.2MB External (4869- 502 )	15X7994
Hard Disk Drive.
1.2GB HDD (for all 9545)	85G8549
5.25-Inch Drive Adapter	72X6757
5.25-Inch Drive Adapter/A	15F7996
5.25-Inch External Diskette Drive Cable
(from system board to adapter)	27F4211
Diskette Drive Bus Adapter	72X8524

CD-ROM Drives

Enhanced Internal CD-ROM II Drive
(Eject button below slot)	61G1901
Internal CD-ROM I Drive
(Eject button above slot)	81F7930
Terminator Kit (for 81F7930 )	59F3530
Cleaning Kit (for 81F7930 )
(Disks, CD Caddy)	59F3562
Internal CD-ROM II Drive
(Eject button below slot)	92F0084
Terminator Kit (for 92F0084 )	92F0082
Media Kit (for 92F0084 )
(No cleaning necessary,
Test Disk, CD Caddy)	31F4232
Signal Cable	34F0043
Power Cable	72X8521
Remote ID Switch Cable (3510)	92F0086
Audio Card, Cable, Screws (3510)	92F0085
CD Caddy	22F9419
Rail Kit (3510)	34F0041
Headphones	53F3610

SCSI Adapters, Terminators, Cables

SCSI Adapter/A (without Cache)	85F0002
SCSI Internal Cable	64F4127
SCSI Adapter/A (with Cache)	85F0063
Terminator, External (for 85F0063 )	33F8464
Terminator, Internal (for 85F0063 )	34F0025
Terminator, Internal (for 85F0002 )	57F2870
SCSI Fast Adapter (16 bit)	92F0330
SCSI External Cable (for 92F0330 )	32G4089
SCSI Internal Cable (for 92F0330 )	32G0084
Terminator, Inline (space permitting)	92F0412

Rewritable Optical Drives

3.5-Inch Rewritable Optical Drive	92F0167
Rewritable Optical Cartridge	38F8647
Rewritable Optical Cartridge (5 Pack)	38F8646
Drive Mounting Slide (for 92F0167 )	85F0022
Tray with Bezel (for 92F0167 )	85F0021
Objective Lens Cleaner (for 92F0167 )	38F8681
Prism Lens Cleaner (for 92F0167 )	38F8682
3.5-Inch Enhanced Rewritable Optical Drive	92F0167
Mounting Tray	92F0269
Mounting Tray/Bezel (Model 3510)	92F0268

External Keyboard/Mouse

Keyboard Cable	72X8537
Mouse	61X8923
Mouse Ball and Pop-Off Retainer	33F8461
Mouse Ball and Twist-Off Retainer	33F8462
Mouse (New Style) ( 33G5420 )	06H4595
Mouse Retainer Ring	33G5417
Miniature Mouse	95F5723

Enhanced Keyboards (101/102 Key)

Country	FRU P/N
Arabic	1391490
Belgian	1391414
Canadian French	1392011
Cyrillic	1393866
Danish	1391407
Dutch	1391511
French	1391402
German	1391403
Greek	1393285
Hebrew	1391408
Italian	1393395
Latin American Spanish	1392015
Norwegian	1391409
Portuguese	1391410
Russian/Cyrillic	1395622
Spanish	1391405
Swedish/Finnish	1391411
Swiss	1391412
Swiss/French	1395881
Swiss/German	1395882
Turkish	1393286
U.K. English	1391406
U.S. English (E/ME/A use only)	1396790
U.S. English	1392090
Yugoslavian	1393669

Optional Enhanced Keyboards (101/102 Key)

with PS/2 Style Cable	59G7980
with AT Style Cable	59G7981
with 25mm PS/2 Trackball	59G7982
with 25mm Serial Trackball	59G9757

Keybutton Kits (101/102 Key)

Keybutton Kits (R), Belgian	1392033
Keybutton Kits (R), Canadian French	1392032
Keybutton Kits (R), Danish	1392026
Keybutton Kits (R), Dutch	1392034
Keybutton Kits (R), French	6447047
Keybutton Kits (R), German	6447048
Keybutton Kits (R), Italian	6447049
Keybutton Kits (R), Norwegian	1392028
Keybutton Kits (R), Portuguese	1392029
Keybutton Kits (R), Spanish	6447050
Keybutton Kits (R), Spanish / Latin	1392035
Keybutton Kits (R), Swedish	1392030
Keybutton Kits (R), Swiss / French / German	1392031
Keybutton Kits (R), U.K. English	6447046
Keybutton Kits, U.S. English	6447045

Japanese Keyboard Type 2 (106 Key, DBCS Support)

Japanese Keyboard	94X1110
Keyboard Cable	94X1147

Space-Saving Keyboards (84/85 Key)

Canadian French	1396046
Spanish/Latin	1396047
U.S. English	1393290
Cable Assembly, External	1393082

Tools and Miscellaneous

Audio Wrap Cable	66G5180
Ethernet BNC T-Connector	84F8207
Ethernet BNC 50-ohm Terminator
(2 required)	85F0037
Grounding Wire Set	38F4684
Keyboard Key Cap Removal Tool	6110464
PC Test Card	33G4703
Screwdriver Kit	95F3598
SCSI Terminator
(any SCSI device, space permitting)	92F0142
SCSI Terminator Kit
(R-PAC Terminator Modules (3) for 40, 60,
80, 120 , and 160MB SCSI Hard Disk Drives)	92F0143
Wrap Plug Ethernet D-Shell	85F0036
Wrap Plug, Tri-Connector	72X8546
Wrap Plug (6157 Tape Attachment Adapter/A)	4178459
Wrap Plug (Token-Ring Network Adapter/A)	6165899
Plastic Envelope (For Wrap Plug)	6138013

ThinkPad Common Parts List

Safety Notice 2

Some standby batteries contain a small amount of nickel and cadmium. Do not disassemble it, recharge it, throw it into fire or water, or short-circuit it. Dispose of the battery as required by local ordinances or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result in ignition or explosion of the battery.

Certaines batteries de secours contiennent du nickel et du cadmium. Ne les démontez pas, ne les rechargez pas, ne les exposez ni au feu ni à l'eau. Ne les mettez pas en court-circuit. Pour les mettre au rebut, conformez-vous à la réglementation en vigueur. Lorsque vous remplacez la pile de sauvegarde ou celle de l'horloge temps réel, veillez à n'utiliser que les modèles cités dans la liste de pièces détachées adéquate. Une batterie ou une pile inappropriée risque de prendre feu ou d'exploser.

Die Bereitschaftsbatterie, die sich unter dem Diskettenlaufwerk befindet, kann geringe Mengen Nickel und Cadmium enthalten. Sie darf nur durch die Verkaufsstelle oder den IBM Kundendienst ausgetauscht werden. Sie darf nicht zerlegt, wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Die Batterie kann schwere Verbrennungen oder Verätzungen verursachen. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der Bereitschafts- oder Systembatterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.

Alcune batterie di riserva contengono una piccola quantità di nichel e cadmio. Non smontarle, ricaricarle, gettarle nel fuoco o nell'acqua né cortocircuitarle. Smaltirle secondo la normativa in vigore (DPR 915 /82, successive disposizioni e disposizioni locali). Quando si sostituisce la batteria dell'RTC (real time clock) o la batteria di supporto, utilizzare soltanto i tipi inseriti nell'appropriato Catalogo parti. L'impiego di una batteria non adatta potrebbe determinare l'incendio o l'esplosione della batteria stessa.

Algunas baterías de reserva contienen una pequeña cantidad de níquel y cadmio. No las desmonte, ni recargue, ni las eche al fuego o al agua ni las cortocircuite. Deséchelas tal como dispone la normativa local. Utilice sólo baterías que se encuentren en la lista de piezas. La utilización de una batería no apropiada puede provocar la ignición o explosión de la misma.

Safety Notice 4

The lithium battery can cause a fire, explosion, or severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100 °C ( 212 °F), incinerate it, or expose its cell contents to water. Dispose of the battery as required by local ordinances or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result in ignition or explosion of the battery.

La pile de sauvegarde contient du lithium. Elle présente des risques d'incendie, d'explosion ou de brûlures graves. Ne la rechargez pas, ne retirez pas son connecteur polarisé et ne la démontez pas. Ne l'exposez pas à une temperature supérieure à 100 °C, ne la faites pas brûler et n'en exposez pas le contenu à l'eau. Mettez la pile au rebut conformément à la réglementation en vigueur. Une pile inappropriée risque de prendre feu ou d'exploser.

Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden, explodieren oder schwere Verbrennungen hervorrufen. Batterien dieses Typs dürfen nicht aufgeladen, zerlegt, über 100 C erhitzt oder verbrannt werden. Auch darf ihr Inhalt nicht mit Wasser in Verbindung gebracht oder der zur richtigen Polung angebrachte Verbindungsstecker entfernt werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.

La batteria di supporto e una batteria al litio e puo incendiarsi, esplodere o procurare gravi ustioni. Evitare di ricaricarla, smontarne il connettore polarizzato, smontarla, riscaldarla ad una temperatura superiore ai 100 gradi centigradi, incendiarla o gettarla in acqua. Smaltirla secondo la normativa in vigore (DPR 915 /82, successive disposizioni e disposizioni locali). L'impiego di una batteria non adatta potrebbe determinare l'incendio o l'esplosione della batteria stessa.

La bateria de repuesto es una bateria de litio y puede provocar incendios, explosiones o quemaduras graves. No la recargue, ni quite el conector polarizado, ni la desmonte, ni caliente por encima de los 100 °C ( 212 °F), ni la incinere ni exponga el contenido de sus celdas al agua. Deséchela tal como dispone la normativa local.

Safety Notice 5

If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands, immediately wash the affected areas with water for at least 15 minutes. Seek medical care if any symptoms from the fluid are present after washing.

Si le panneau d'affichage à cristaux liquides se brise et que vous recevez dans les yeux ou sur les mains une partie du fluide, rincez-les abondamment pendant au moins quinze minutes. Consultez un médecin si des symptômes persistent après le lavage.

Die Leuchtstoffröhre im LCD-Bildschirm enthält Quecksilber. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Der LCD-Bildschirm besteht aus Glas und kann zerbrechen, wenn er unsachgemäß behandelt wird oder der Computer auf den Boden fällt. Wenn der Bildschirm beschädigt ist und die darin befindliche Flüssigkeit in Kontakt mit Haut und Augen gerät, sollten die betroffenen Stellen mindestens 15 Minuten mit Wasser abgespült und bei Beschwerden anschließend ein Arzt aufgesucht werden.

Nel caso che caso l'LCD si dovesse rompere ed il liquido in esso contenuto entrasse in contatto con gli occhi o le mani, lavare immediatamente le parti interessate con acqua corrente per almeno 15 minuti, poi consultare un medico se i sintomi dovessero permanere.

Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos o sus manos, lave inmediatamente las áreas afectadas con agua durante 15 minutos como mínimo. Obtenga atención medica si se presenta algún síntoma del fluido despues de lavarse.

Three power management modes are provided by the computer to save power consumption and prolong battery power.

Standby Mode When in standby mode the following occurs:

• The LCD backlight turns off.
• The hard disk motor stops.
• The CPU clock is set to the lowest speed.

Events that cause entering of standby mode:

• Standby requested by the Fn key. (Fn+F3)
• No activity under auto-standby enabled by the feature  utility.

Events that cause exiting or resuming of standby mode:

• (Resume) Any key operation.

Suspend Mode

When in suspend mode, the following, in addition to the four actions of standby mode, occur:

• The LCD power is powered-off.
• The hard disk is powered-off.
• The CPU is stopped.

In the ThinkPad Features Program, the computer can be set to 'Will not suspend even if LCD is closed'..

When the computer is powered with ac power and is used with one of the following IBM PC cards, the computer enters standby mode , the PC card and application program remain active.

• 3270 Emulation Credit Card Adapter
• 5250 Emulation Credit Card Adapter
• Token-Ring 16/4 Credit Card Adapter
• Credit Card Adapter for Ethernet

In the following condition, the computer cannot enter the suspend mode.

• While the communication link is running.
• When a serial mouse or other pointing device is selected  in the Config menu of Easy-Setup.

Events that cause entering of suspend mode:

• Suspend mode is requested by the Fn key (Fn+F4).
• The LCD is closed.
• The keyboard is opened.
• The specified time has elapsed from the last operation with  the keyboard, mouse, hard disk drive, parallel connector,  diskette drive, or the AC Adapter is plugged in.  The time is specified by Suspend Timer in the ThinkPad Features program.
• The battery condition is low. The battery power indicator  blinks (orange).
• The PS2 OFF command is set in  the ThinkPad Features program.

Events that cause exiting or resuming of suspend mode:

• (Resume) The LCD is opened.
• (Resume) The keyboard is closed.
• (Resume) Real time clock alarm signaled.
• (Resume) Ring indicator  (RI) signaled by serial or PCMCIA device.
• (Resume) The Fn key is pressed.
• (Exit) Timer conditions are satisfied  to enter hibernation mode.

Hibernation Mode

When in hibernation mode, the following occurs:

• The system status, RAM, VRAM, and setup  data are stored on the hard disk.
• The system is powered-off.

The computer cannot enter hibernation mode when:

• A serial mouse or other pointing device is selected in the Config menu.

• The computer is powered with ac power and one of the following IBM PC cards is used.

  • PCMCIA Data/FAX Modem
  • High Speed PCMCIA Data/FAX Modem
  • 3270 Emulation Credit Card Adapter
  • 5250 Emulation Credit Card Adapter
  • Token-Ring 16/4 Credit Card Adapter
  • Credit Card Adapter for Ethernet

Events that cause entering of hibernation mode:

• The hibernation mode is requested by the Fn  key (Fn+F12).
• Timer conditions are satisfied in suspend mode.
• Critical low battery condition.

Event that causes exiting of hibernation mode.

• The power-on switch is operated.

When power is turned on, the hibernation history of the boot record on the hard disk is recognized and system status is restored from the hard disk to resume operation.

Symptom/Error	FRU/Action
Power shut down during operation.	1. Go to 'Power Systems Checkout' 2. Battery Pack 3. Remove the battery pack and let it cool for two hours. 4. DC/DC Card 5. Power sources
The system will not power-off. (See 'Reset Pushbutton')	1. Press the Reset pushbutton. 2. System Board

1. Power-off the computer and unplug the AC Adapter  from the computer.
2. Open the keyboard, and remove the battery pack and the  diskette drive.
3. Remove the backup battery from the system board.
4. Measure the voltage of the backup battery.

Wire	Voltage (Vdc)
Red	+2.5 to +3.7
Black	Ground

• If the voltage is correct, replace the system board.
• If the voltage is not correct, the backup battery has been  discharged. Replace the backup battery.
• If the backup battery discharges quickly after replacement,  replace the system board.

Battery charging will not start until the Fuel-Gauge shows that less than 90% of the total power remains; with this condition the battery pack will charge to 100 % of its capacity. This protects the battery pack from being over-charged or having a shortened life.

NOTE:

1. Models 355x and 360x battery pack does not contain a microprocessor. In the following, ignore any reference to the storage switch.

2. Before you perform the following procedure, check the following:

   • The correct battery pack is used for the model.
   • The storage switch set to on (!).

   • Power-off the computer.

   • Remove the battery pack and measure the voltage between battery  terminals

     NOTE: The following figure hows the battery for the Model 370C,  750x, 755C, and 755Cs.  The battery for Models 355x and 360x, do not have the  storage switch, but the battery terminals are the same.

     

     Terminal	Voltage (V dc) / Signal
     1	+ 8.0 to + 16.0
     2	Send
     3	Thermal
     4	Ground (-)
     5	R1
     6	Select
     7	R2

     NOTE: Signal lines, not used in these steps,  are used for communication between the system and the battery.  The storage switch is used to control the power to the  internal microprocessor of the battery.  The storage switch should be  set to off (0) only when the battery is going to be kept in storage  for more than two months.

     • If the voltage is less than + 8.0 Vdc, the battery pack has  been discharged or is defective.  Recharge the battery.  If the recharging does not work,  go to Step 5 to check the charging circuit.

     If the voltage is still less than + 8.0 Vdc after the recharging,  replace the battery.

     • If the voltage is more than + 8.0 Vdc,  measure the resistance between  battery terminals 3 and 4.  The resistance must be 4 to 30 kilohms.
     • If the resistance is not correct, replace the battery pack.
     • If the resistance is correct, replace the DC/DC card.

   • To check the charging circuit, do the following. Plug in the AC Adapter with the battery pack removed, then power-on the computer.

     • Measure the charging voltage between DC/DC terminals 1 (+) and 4 (-).
     • If the voltage is less then + 9.0 Vdc, replace the DC/DC card. If the voltage is more than + 9.0 Vdc, the charging circuit is working correctly, replace the battery pack.

NOTE:

1. Be careful that the computer does not fall backward when  the battery pack is removed.
2. Check that the keyboard latch springs are in place.

NOTE:

1. Be careful that the computer does not fall backward when  the battery pack is removed.
2. When replacing the battery pack,  check that the storage switch of the new battery  is set to the on (!) position.  Do not operate the storage switch of a battery that has been used  and is going to be re-used.
3. Check that the keyboard latch springs are in place.

You are here because the computer fails only when the AC Adapter is used.

• If the power problem occurs only when the port replicator is used,  replace the replicator.
• If the power-on indicator does not turn on, check the power  cord of the AC Adapter for correct continuity and installation.
• If the operational charge does not work, go to 'Checking Operational Charging'

NOTE: There are two types of adapters. The procedure for checking both types is the same.

1. Unplug the AC Adapter cable from the computer and  measure the output voltage at the plug of the AC Adapter cable.

Pin	Voltage (Vdc)
1	+19.0 to +21.0
2	Ground

• If the voltage is correct, replace the system board. If the  problem is not corrected, go to 'Undetermined Problems'
• If the voltage is not correct, go to the next step.
• Unplug the AC Adapter cable from the ac power outlet and wait  five minutes or longer to allow the over voltage protection circuit  to be fully discharged and initialized.
• Plug the AC Adapter cable into the ac power outlet.
• Measure the output voltage of the AC Adapter.
• If the voltage is still not correct, replace the AC Adapter.

NOTE: An audible noise from the AC Adapter does not always indicate a defective adapter.

To check operational charging, use a discharged battery pack or a battery pack that shows a yellow or orange battery status indicator when it installed in the computer.

Perform operational charging. If the battery status indicator turns orange and the battery charging indicator turns green within two minutes, replace the AC Adapter.

There are two types of adapters but the checkout procedure is the same for both of them.

1. Unplug the Car-Battery Adapter cable from the computer.

2. Plug the Car-Battery Adapter into the cigarette lighter socket.

   NOTE: If the adapter is already plugged in, reseat it.

   • Measure the output voltage of the Car-Battery Adapter cable.

   

   Pin	Voltage (Vdc)
   1	+19.0 to +21.0
   2	Ground

   • If the voltage is correct and the power-on indicator  on the Car-Battery Adapter is on all the time, the Car-Battery  is working correctly. Replace the system board.

     If the problem is not resolved when the system board is replaced,  go to 'Undetermined Problems' - If the voltage is outside the normal voltage range, do one of the  following:

     • Try the above test procedures in a different car,  if one is available.
     • Replace the Car-Battery Adapter if the computer works  correctly with the AC Adapter.

NOTE: If the output voltage from the cigarette lighter socket of the car is less than + 10.5 Vdc, the power-on indicator on the Car-Battery Adapter blinks and a continuous noise can be heard. The condition of the car battery should be checked by appropriate service personal.

The Car-Battery Adapter does not support operational charging.

There are two types of chargers, but checkout procedures are the same for both of them.

1. Ensure that the battery pack is  operating correctly. (See 'Checking the Battery Pack').

2. Connect the power cord to the quick charger and the other  end to an ac power outlet.  Ensure that the power-on indicator is on.

   • If the power-on indicator does not turn on, check the power cord  for correct continuity and installation.
   • If the problem is not corrected,  replace the quick charger or the power cord.

   • Install the battery pack into the quick charger.

   • If the charging indicator does not start blinking,  replace the quick charger.

1. Power-off the computer and unplug the AC Adapter  from the computer.
2. Open the keyboard, and remove the battery pack and the diskette drive.
3. Remove the standby battery.
4. Measure the voltage of the standby battery.
   • If the voltage between red and black is 3.5 Vdc or greater, the voltage is correct. Go to Step 10 to verify standby battery operation.
   • If the voltage is less than 3.5 Vdc, go to the next step.
5. Plug the AC Adapter into the computer and power-on the computer.
6. Measure the output voltage at the connector on the system board.

   

   Pin	Voltage (Vdc)
   +	+4.0
   -	Ground

   • If the voltage is less than + 4.0 Vdc, replace the DC/DC card. If the voltage is still low, replace the system board.
   • If the voltage is more than + 4.0 Vdc, power-off the computer, replace the standby battery, and go to the next step.
7. Ensure that the AC Adapter is plugged into the computer, then power-on the computer.
8. Charging of the standby battery starts. A depleted battery needs approximately 30 minutes to be recharged to the operational voltage of + 3.5 Vdc.
9. Unplug the AC Adapter.
10. Verify the standby battery function by removing and installing the battery pack during suspend mode.

    NOTE: Removing and installing the battery pack during suspend mode should be done within one minute. The resume operation must start. If the resume operation does not work, switching of power from the battery pack to standby battery will not be correct. Replace the DC/DC card. If replacing the DC/DC card does not resolve the problem, replace the system board.

If power shut downs occur intermittently when using PCMCIA-2 devices via a port replicator, suspect an over-current problem. Some PCMCIA devices use more power, if the maximum usage of each device occurs simultaneously, the total current will exceed the limit, thereby causing a power shut down. Isolate this problem by removing one of the devices, and use the computer under the same condition to see whether a power shut down occurs. Do this procedure for all devices, then determine the cause. Use of the larger AC Adapter (50W, optional) is recommended, if one is not yet in use.

Use the ThinkPad Features program or PS2.EXE. to power-on the TV Tuner, then power-on the internal device in the diskette drive compartment.

If power for the internal device is turned off when the TV Tuner is set up, nothing appears on the LCD display. Turn on power for the TV Tuner again.

• If you are using DOS, do one of the following:

• Power-on the computer and type PS2 from the  command prompt to start the ThinkPad Features program. Select Set Power Features from the ThinkPad Features  menu,then put a check mark at Internal Serial Port (or Diskette Drive Compartment )  under the Power for devices .  If you need help, press F1 to display the help menu.
• Type ps2 modem on from the command prompt,  press the Enter key to set the power ON.

• If you are using OS/2 or  Microsoft Windows, do the following:

  1. Power-on the computer and start the ThinkPad Features program.
  2. Select the Power icon, then move the pointer to Internal Serial Port (or Diskette Drive Compartment )  under the Power for devices and click the button to check mark it.
  3. Press the OK button.

If you suspect a problem with the Port Replicator, see 'Port Replicator Checkout' in the 'Common Devices Checkout' section for more information.

Use the following procedure to isolate a port replicator problem. A port replicator attaches to the system expansion connector at the rear of the computer.

1. Power-off the computer.
2. Remove the failing devices from the replicator.
3. Unplug the AC adapter from the replicator, if attached.
4. Remove the port replicator from the computer.
5. Reconnect the failing device directly to the computer.  (If another device occupies the connector, remove it first.)
6. Go to General Checkout and follow that procedure.
7. If the advanced diagnostic device test does not find an error,  suspect a problem with the port replicator  or the system expansion bus.
8. Power-off the computer and reconnect the port replicator.
9. Power-on the computer and run the following advanced diagnostic tests:
   • Serial port test with the wrap plug installed on the replicator.
   • Parallel port test with the wrap plug installed on the replicator.
   • PCMCIA-2 test with the PC test card installed.
   • FDD-2 (FDD-1 if no drive is installed in the computer) drive test on the failing device.
   • If diagnostic errors appear, replace the replicator or diskette drive attachment unit. If the problem remains after the replacement, replace the system board.
   • If power problems appear only when using the replicator, replace the replicator.

If power shut downs occur intermittently when using PCMCIA-2 devices via a port replicator, suspect an over-current problem. Some PCMCIA devices use more power; if the maximum usage of each device occurs simultaneously, the total current will exceed the limit, thereby causing a power shut down. Isolate this problem by removing one of the devices, and use the computer under the same condition, and see whether a power shut down occurs. Do this procedure for all devices then determine the cause.

Customer purchase of the larger AC adapter (50W, optional) is recommended, if it is not yet in use.

Remove the external keyboard if the internal keyboard is to be tested.

If the internal keyboard does not work or an unexpected character appears, make sure that the three flexible cables extending from the keyboard are correctly seated in the connectors on the interposer card.

If the keyboard cable connection is correct, run the Keyboard Test by doing the following:

1. Go to diagnostic menu screen by pressing Ctrl+A in Easy-Setup screen.
2. Press Ctrl+K , the figure of the keyboard  appears on the screen.
3. Check that when each key is pressed, the key position  on the keyboard layout on the screen changes to be a black square.

NOTE: When a Fn key is pressed, the black square briefly appears.

If the tests detect a keyboard problem, do the following one at a time to correct the problem. Do not replace a non-defective FRU.

• Reseat the three cables.
• Replace the keyboard.
• Replace the interposer card.
• Replace the system board.

The following auxiliary input devices are supported for this computer.

• Numeric keypad
• Mouse (PS/2 compatible)
• External keyboard (with keyboard/mouse cable)

If any of the above devices do not work, reseat the cable connector and repeat the failing operation.

If the problem does not occur again, recheck the connector.

If the problem is not corrected, replace the device, and then the system board.

If the TrackPoint II will not work, check the configuration in Easy-Setup by selecting Keyboard from the Config menu.

If the configuration of the TrackPoint II disabled, select TrackPoint to enable it.

If this does not correct the TrackPoint II problem, continue with the following.

The TrackPoint II does automatic compensations to adjust the pointer sensor. During this process, the pointer moves on the screen automatically for a short time . This self-acting pointer movement can occur when a slight, steady pressure is applied to the TrackPoint II pointer while the computer is powered on or while the system is running, or re-adjustment is required because the temperature has exceeded its normal temperature range. This symptom does not indicate a hardware problem. No service actions are necessary * if the pointer movement stops in a short period of time.

If a click button problem or pointing stick problem occurs , do the following:

1. Go to Easy-Setup screen.
2. Select an item with the pointing stick.
3. Press either the left or right click button.
4. Verify that both buttons work correctly.

If either the pointing stick or the click button will not work, do the following actions one at a time to correct the problem. Do not replace a non-defective FRU.

• Reseat the three keyboard cables.
• Replace the keyboard.
• Replace the interposer card.
• Replace the system board.

Do the following to run the audio tests.

NOTE: Refer to 'Product Overview' to see whether the audio card is standard or not.

1. Power-off the computer.

2. Insert the ThinkPad 750Ce hardware maintenance diskette into diskette drive A and power-on the computer.

   NOTE: You can use this maintenance diskette for all Models.

   • Select the Audio Diagnostics from the main menu.

   • Select Tests from the menu bar and press Enter.

   • Select All tests from the pull-down menu and press Enter.

     Run options are set to test once and stop on error as defaults.  Other options can be selected by the pull-down menu of Setting-up .

     • Follow the instructions that  appear on the screen to proceed with the tests.
     • If the tests end and no errors are detected,  the “All tests passed OK message appears.
     • If an error is detected, the FRU code and error description message  appear.  Go to 'FRU Codes' and replace the FRU.
     • To exit from the test screen, press Esc .

Do the following to isolate the problem to a controller, drive, or diskette. A scratch, write enabled, non-defective 2HD diskette is required.

**Make sure that the diskette does not have more than one label attached to it.

Multiple labels can cause damage to the drive or can cause the drive to fail.

1. Do the following to select the test device:

2. Select the advanced diagnostic mode and  select Tool ,- Select the icon FDD-1 or FDD-2 and  press the space key.

   NOTE: Remember that removing the hard disk drive, an IC DRAM card, or any adapter or device, might cause configuration errors. Ignore error code 174.

• Two types of LCDs are available for the Model 755C: one with a contrast control  and one without. Make sure that you replace the LCD with the correct type.
• The LCD for the Model 370C does not have a contrast control.

1 When replacing the LCD ground-terminal screw, do not pull or push the LCD cables.

2 When removing the LCD cables, pull the connector straight up. Incorrect handling can damage the connector.

NOTE: For the color models, make sure the indicator does not catch the right LCD connector when replacing the status indicator.

3 Remove the screw.

4 Remove the right hinge cover.

5 When removing the left hinge cover, use a small screwdriver as shown to release the latch from the rear base cover. Pull the hinge cover slightly upward to keep it unlatched.

6 From the front side, remove the latch with a small screwdriver as shown to remove the cover. Be careful not to scratch the surface of the computer when you use a screwdriver to remove the latches.

7 Remove the four screws.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	LCD ground-terminal (1)	4 mm
3	LCD hinge cover, right (1)	4 mm
7	LCD hinge (4)	4 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

please READ - see >>

Caring for the LCD

• When cleaning of the LCD becomes necessary,  gently wipe the LCD with a dry, soft cloth.  Do not use alcohol or detergent to clean the LCD.
• To avoid damaging the LCD,  do not scratch or apply any force to its surface.
• Do not put anything on the surface of the LCD.

1. Diskette Drive Cover
2. Power Switch
3. Microphone/Line-In Jack
4. Headphone Jack

   NOTE: Not all models have jacks 3 and 4.

5. Power Jack
6. Serial Connector
7. Parallel Connector
8. External Display Connector
9. Reset Pushbutton
10. System Expansion Connector

Model 355x does not have this connector.

A multimedia portable expansion unit, port replicator, or port replicator with PCMCIA can be connected to this interface to support the following features.

• 16-bit AT-bus interface
• Serial port
• Parallel port
• Keyboard and mouse
• HDD connection
• LED control signals
• Visual signals
• Audio signals
• FDD signals
• PCMCIA signals
• Power controls
• Power line

11 Connector Door

12 Rear Door

1. Power-On Password Connector
2. Backup Battery Connector
3. Standby Battery Connector
4. IC DRAM Card Connector
5. Processor Card Connector (750Ce, 755C, 755Cs)

1. System Board Connector

DC/DC Card - Top View

1. External Power Jack
2. Battery Pack Terminal

Models 355x, 360x

Models 370C, 750x, 755x

1. LCD Connector, Color
2. LCD Connector, Pen
3. LCD Connector, Monochrome and Color
4. LCD Power Connector, Color
5. Status Indicator Connector
6. Keyboard TrackPoint II Connector
7. Keyboard Signal Connector
8. Keyboard Signal Connector
9. LCD Open Detect Switch

Miscellaneous Parts.

	FRU P/N
AC Adapter (35 W, 3-pin)	85G1952
For Japan (2-pin)	85G6669
AC Adapter (40 W, 3-pin)	49G2196
For Japan (2-pin)	49G2197
AC Adapter (40 W, 3-pin, U.S. only)
(not for 370C)	84G4320
Foot (right or left)	84G4326
Miscellaneous Parts Kit
(Includes DC-in holder, spacer, warning label)
For Models 750x	66G5039
For Models 355x, 360x, 370C, 755C, 755Cs	84G2254
PC Card Locking Bar	85G8625
Screw Kit	66G5124
Includes:
10-2.5 x 4 mm, 10-2.5 x 6 mm
10-2.5 x 8 mm, Flat head
10-2.5 x 8 mm, 10-2.5 x 16 mm
10-hex stud I/O, 10-hex stud bus
2-washer for hex stud bus)
IC DRAM CARD - Eject Tape	53G9318
ThinkPad 370C/755 Memory
DIMM Memory Module Adapter
(OPT P/N TOMMADP)	84G4322
4MB DIMM Module (OPT P/N TOMMD04)	84G4323
8MB DIMM Module (OPT P/N TOMMD08)	84G6545
16MB DIMM Module (OPT P/N TOMMD16)	85G0193
	84G4324

1. When you replace the AC adapter or the Quick Charger with a new one, use the one for the country you are in even if the system is from different country.
2. The warranty for the system unit is not applied to all options.

Options

	FRU P/N
Audio Cable	66G5180
Car Battery Adapter
( 48G9203 label sealed)	49G1148
Car Battery Adapter
( 66G9984 label sealed)	84G4359
Diskette Drive Attachment Unit	66G5069
IC DRAM CARD 2MB	07G1414
IC DRAM CARD 4MB	07G1415
IC DRAM CARD 8MB	07G1416
IC DRAM CARD 16MB	66G0094
Microphone	66G7871
PS/2 Miniature Mouse	95F5723
Port Replicator
(Model-II 760 / 765 /765L)	66G3575
Port Replicator with PCMCIA
(Model-I 760 / 765 /765L)	66G3574
Quick Charger (3-pin)	66G2815
For Japan (2-pin)	66G2816

Model Unique Options

Models 355x, 360x, 370C

	FRU P/N
4MB IC DRAM CARD (no parity)	84G5724
8MB Basic IC DRAM CARD (no parity)	84G5725
16MB IC DRAM CARD (no parity)	84G5726
Internal Modem Card
(U.S./Canada/Latin America)	84G5917
Telephone Cable
(U.S./Canada/Latin America)	84G8254
Telephone Wall Plug	85G2367

Model 370C

	FRU P/N
Audio Card	66G5037
4MB IC DRAM CARD (no parity)	84G5724
8MB Basic IC DRAM CARD (no parity)	84G5725
16MB IC DRAM CARD (no parity	84G5726
Diskette Drive (4-mode)
Supported in U.S. only.	66G5060

Model 750x

	FRU P/N
AC Adapter (35 W, 3-pin)	85G1952
For Japan (2-pin)	85G6669
AC Adapter (40 W, 3-pin, U.S. only)	84G4320
AC Adapter (40 W, 3-pin)	49G2196
For Japan (2-pin)	49G2197

Model 755C, 755Cs

	FRU P/N
DIMM 4MB	84G4323
DIMM 8MB	84G6545
DIMM 16MB	84G4324
DIMM Adapter Card	84G4322
Diskette Drive (4-mode)
Supported in U.S. only.	66G5060

Numeric Keypad

	FRU P/N
Belgian	95F5741
Canadian French	95F5466
Danish	95F5467
Dutch	95F5467
French	95F6313
German	95F6314
Greek	95F5467
Hebrew	95F5741
Icelandic	95F5467
Italian	95F6316
Japanese	79F6401
Norwegian	95F5467
Spanish	95F6315
Swedish/Finnish	95F5468
Swiss/French	95F5711
Swiss/German	95F5715
Turkish	95F5467
U.K. English	95F5741
U.S. English	95F5741

Accessories

	FRU P/N
Keyboard/Mouse Cable	54G0444

Tools

	FRU P/N
Tri-Connector Wrap Plug	72X8546
PC Test Card	35G4703
Screwdriver Kit	95F3598
ThinkPad 750Ce	82G3891
Hardware Maintenance Diskette
(This diskette is common for
all models of ThinkPad.)

Power Cords

Use the power cord certified for your country.

Ref.	Country	30/40W	35W
1	Colombia, U.S., Venezuela	13F9959	25H2207
1	Japan, 2-pin	6454377	85G6665
1	Japan, 3-pin	65F0031
2	Hong Kong, Singapore, U.K.	14F0033	25H2215
3	France, Germany, Spain	13F9979	25H2209
4	Italy	14F0069	25H2223
5	Australia, New Zealand	13F9940	25H2205
6	Denmark	13F9997	25H2211
7	Israel	14F0087	25H2225
8	Bangladesh, Pakistan, Sri Lanka, South Africa	14F0015	25H2213
9	Switzerland	14F0051	25H2221
10	Thailand	1838574	25H2219

NOTE:

• Models 370C, 755C, and 755Cs do not support the  30W AC adapter.
• The 30/40W cord is 1.8m (6 ft.) long, the 35W cord is 0.15m (6-Inch).

Use the chart to match the size and shape of the screws in the computer you are servicing.

Remove the center latch 1 , then remove the rear connector door by flexing it 2

To replace the foot:

• Align the foot in the open position with one  pivot in its hinge in the base cover
• Press the other pivot point into position with your thumb or finger

1. Do not apply any extra force to  the hard disk drive when removing it. Remove the hard disk drive exactly as shown in the figure.
2. Do not drop or apply any shock to the hard disk drive. The hard disk drive is sensitive to physical shock.  Incorrect handling can damage it or  cause permanent loss of data.  Before removing the hard disk drive, have  the user make a backup copy of all information on the hard disk.  Never remove the hard disk drive while the system is operating or is in  suspend mode.

After replacing the hard disk drive, latch the removal strap into the correct position.

The IC DRAM card is sensitive to physical shock. Incorrect handling of the card can damage it. The eject tape ( P/N 53G9318 ) must be used to remove the card.

1 When replacing the LCD ground-terminal screw, do not pull or push the LCD cables.

2 When removing the LCD cables, pull the connector straight up. Incorrect handling can damage the connector.

NOTE: For the color model, make sure the indicator does not hook the most right LCD connector when replacing the status indicator.

3 Remove the screw.

4 Remove the right hinge cover.

5 When removing the left hinge cover, use a small screwdriver as shown to release the latch from the rear base cover. Pull the hinge cover slightly upward to keep it unlatched.

6 From the front side, remove the latch with a small screwdriver as shown to remove the cover. Be careful not to scratch the surface of the computer when you use a screwdriver to remove the latches.

7 Remove the four screws.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	LCD ground-terminal (1)	4 mm
3	LCD hinge cover, right (1)	4 mm
7	LCD hinge (4)	4 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

please READ - see >>

Caring for the LCD

• When cleaning of the LCD becomes necessary,  gently wipe the LCD with a dry, soft cloth.  Do not use alcohol or detergent to clean the LCD.
• To avoid damage to the LCD,  do not scratch or apply any force to its surface.
• Do not put anything on the surface of the LCD.

1095 Interposer Card

Carefully remove any metal particles that might have flaked off. Be careful not to damage it with a screwdrivers, screws, or other objects.

2 When replacing the speaker shield, insert it under the projection at the left, rear corner of the computer base.

NOTE: The shaded part in the figure is attached to the speaker shield assembly with light adhesive. This is a separate FRU from the speaker shield assembly.

3 When raising the speaker shield assembly, make sure that the shield assembly does not hook the three flexible cables of the keyboard.

For Model 360 , gently raise the speaker shield assembly to avoid damaging the speaker cable. (For Models 355 and 355Cs, skip step 3 , the speaker cable has already been removed.)

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1a	Speaker shield (1)	4 mm
1b	Hard disk drive connector (2)	6 mm
1c	System board (1)	16 mm
1d	System board, spacer (1)	16 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

Verify that the spacer 1d is in the correct position.

2 is a shield for radio frequency interference.

The EEPROM on the system board contains the vital product data (VPD), that is, system unit serial number, system board serial number, and other computer unique data. When the system board is replaced, the system unit serial number must also be restored. Use the Set system identification * utility on the maintenance diskette to restore the number.

Do not power-off the computer when restoring the VPD.

The serial number label is attached to the bottom cover.

NOTE:

1. Before removing and replacing the system board, make sure that the  PCMCIA  cards are removed and the eject levers are not sticking out.
2. When replacing  the system board assembly, align the power-key slide  hub with the power-switch actuator by moving the power-key in  the direction of the arrow.  See the large circle in the figure.  Before tightening  any screws, check that the power-switch operates correctly.
3. Do not pull the PCMCIA slot assembly while removing the system board.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	Hinge bracket (4)	4 mm
2	Base cover, lower shield (1)	4 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

The system board can be damaged if the lower shield touches the system board components. Carefully follow the next instruction.

In step 4 , gradually raise the system board from the lower shield until all the components of the system board just clear the tabs of the lower shield. Be careful not to raise it too far. While keeping the clearance to a minimum, separate the system board from the lower shield by moving the system board straight forward as shown by step 2

NOTE:

1. When handling the PCMCIA slot assembly,  be careful not to disassemble any part of it.  The slot assembly is not solidly fixed when it is removed from the  system board or the FRU.
2. The screw stand-off located each corner of  the PCMCIA slot, is easy to remove.  Make sure that the screw stand-off is positioned when replacing  the slot. Do not replace the slot without the screw stand.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	PCMCIA slot, upper (2)	12 mm
2	PCMCIA slot, lower (2)	14 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

Remove the center latch 1 , then remove the rear connector door by flexing it 2 .

To replace the foot:

• Align the foot in the open position with one  pivot in its hinge in the base cover
• Press the other pivot point into position with your thumb or finger

1. Do not apply any extra force to the  hard disk drive when removing it. Remove the hard disk drive exactly as shown in the figure.
2. Do not drop or apply any shock to the hard disk drive. The hard disk drive is sensitive to physical shock.  Incorrect handling can cause damage it,  and cause permanent loss of data on the hard disk.  Before removing the hard disk drive, have  the user make a  backup copy of all the information on the hard disk.  Never remove the hard disk drive while the system is operating or is in  suspend mode.

After replacing the hard disk drive, latch the removal strap into the correct position.

For Models 370C, 755C and 755Cs, one of two types of memory card can be used, IC DRAM card or DIMM card.

The IC DRAM card is sensitive to physical shock. Incorrect handling of the card can damage it. The eject tape ( P/N 53G9318 ) must be used to remove the card.

NOTE: For Models 370C, 755C and 755Cs, one of the following combinations occupies the slot depending on the configuration.

• IC DRAM card + IC DRAM card base
• DIMMs on DIMM adapter

Press both locks at the same time and remove the DIMM.

While holding the strap 1 , pull the DIMM adapter toward the front 2 to remove it.

NOTE:

1. If the IC DRAM cards or the DIMM are not installed and  the base plate is installed instead of these card,  remove the plate as follows:
2. Pinch the projection 1 on the left side of the plate,  then pull the plate slightly toward the front 2 .
3. Raise the rear portion of the plate 3 and remove it.

   

   When inserting the DIMM into either connector

   on the DIMM adapter: 1. Locate the triangle A on the right side of the  socket.

   With the notched end of the DIMM B toward the triangle,  insert the DIMM into the socket.

   Pivot the DIMM until it snaps into place.

   If you have another DIMM to install, insert it in the other socket the same way.

   

2080 Speaker Shield Assembly

Models 750x, 755C, and 755Cs

and Model 370C

1. Carefully remove any metal particles that might have flaked off.
2. The shaded part in the figure is attached  to the speaker shield assembly  with light adhesive. This FRU is a separate FRU  from the speaker shield assembly.

1 Remove the screws.

2 Gently raise the speaker shield assembly to avoid damaging the speaker cable and make sure that the shield assembly does not hook the three flexible cables of the keyboard.

3 Disconnect the speaker connector.

When Disconnecting the Connector

• Do not pull the speaker cable before the audio card is removed.
• Be careful not to damage the speaker with screwdrivers, screws,  or other objects. A scratch will damage the speaker.
• When replacing the speaker shield, insert it  under the projection at the left, rear corner of the computer base.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1a	Speaker shield (4)	4 mm
1b	Hard disk drive connector (2)	6 mm
1c	System board (1)	16 mm
1d	System board, spacer (1)	16 mm
1e	Diskette drive connector (2)	6 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

1d shows the correct position of the spacer.

2 is a shield for radio frequency interference.

The EEPROM on the system board contains the vital product data (VPD), that is, system unit serial number, system board serial number, and other computer unique data. When the system board is replaced, the system unit serial number must also be restored. Use the Set system identification * utility on the maintenance diskette to restore the number.

Do not power-off the computer when restoring the VPD.

The serial number label is attached to the bottom cover.

NOTE:

1. For Model 755C, there are two types the system boards.  Make sure the correct system board by checking the part number  in the part list.  After replacing the system board, run the display test  from the Easy-Setup and  use the Pause button to check the color graduations  that are displayed after the Video Page screen.  If the color blocks in one column are all the same color,  replace the system board.
2. Before removing and replacing the system board, make sure that the  PCMCIA  cards are removed and the eject levers are not sticking out.
3. When replacing  the system board assembly, align the power-key slide  hub with the power-switch actuator by moving the power-key in  the direction of the arrow.  See the large circle in the figure.  Before tightening  any screws, check that the power-switch operates correctly.
4. Do not pull the PCMCIA slot assembly while removing the system board.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	Hinge bracket (4)	4 mm
2	Base cover, lower shield (1)	4 mm

NOTE: Make sure you use the correct screw. Screw Size Chart

The system board can be damaged if the lower shield touches the system board components. Carefully follow the next instruction.

In step 3 , gradually raise the system board from the lower shield until all components of the system board just clear the tabs of the lower shield. Be careful not to raise it too far. While keeping the clearance to a minimum, separate the system board from the lower shield by moving the system board straight forward as shown by step 3

NOTE: In step 1 , each screw has a flat washer and a lock washer. When reinstalling the screws, make sure that the lock washer is placed next to the head of the screw. Incorrect washer placement can cause metal to flake.

Turn the system board upside down. Remove the screws 4 and 5 . Models 370C, 755C and 755Cs have only the screw on the right side in step 5 .

1. In step 1 , use 5.0 mm and 5.5 mm hex head screwdrivers.  To remove the processor card, gently lift  the area shown by 3 straight up.  Do not pull the other areas.
2. In step 6 , pull both edges of the bracket at the same time.  Do not pull the center of the bracket.

Use the following table for reference when replacing parts.

Step	Location (Quantity)	Length
1	Expansion bus, lower shield (2)	Hex head
1	I/O connector, lower shield (6)	Hex head
4	Processor card (1)	6 mm
5	Processor card connector 750x - (2), 370C, 755C, 755Cs - (1)	4 mm

NOTE: Make sure you use the correct screw. Screw Size Chart