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IE. Calculator Service Bulletin No.ED3-04

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SERVICE MANUAL- PARTS

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LMan
MONROE Th. Calculator Company
Service Operations Deportment - Technical Publications - Orange, N. J., U.S.A.

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 CONTENTS
1. Specifications

2. Photograph

3. Diagrams

3 1 Schematic Diagram

32 Printed Circuit Board

33 PCB Wiring Diagram

34 Exploded Drawing

4. Adjustments

4 1 Mechanical system

5. Maintenance

6. Parts list

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 1.SPECIFICATIONS
SPECIFICATIONS
Type Phillips cassette data recorder
Tape Speed 1 - 7/8 ips
Power Source External power supply
Track system 4 - track, 2 - channel
Write system DC saturating bias
Bit Density 550 flux reversals per inch per channel
Data transfer rate maximum of 100 flux reversals per second per channel
Cassette used C- 30 and endless cassette (1 minute)
Fast forward time 120 sec with C - 60 cassette
Rewind time 120 sec with C - 60 cassette
Wow & flutter 0.45% RMS

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 2. Photograph

Counter @

Cover@

Read from tape button

/
Stop button @
Forward button @

Ready button @

Rewind button @

Record button @

Eject button @

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 Ass'y Reel Rest for take up (j])

Pinch roller @

Motor@---..,

Idler@ 2~~~nel
00\ @
Counter7§, Ass'y Reel Rest for Supply@l

Flywheel/capston assembly ®

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51 IRllE
nnll-~'-4V
VJ
QIBASE
........=
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oC oC oC
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01 COll£CTDR
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'" '" '" II
/1 N55sev 02 COllECTOR
H)-i)-i
i r; r : t~ 6V
01 2SA 120
4J ~l
5101\. Tfl ruu-L-=:J 16V
11 (110 J IDATA 401
47V RI
fBHl 1~!
~4,-,I,-,-V ,. RHO ClOe! 11/01 14
INTI
READ
13 IllOli DATi 41)
02 2SA 72a ~! 84
3M
~-:~--"""----3.2-V"'(O"'ff""J~ READ DATA All/D) 11
TP-I\--\-t1s~:r--a-k,\V [IVi 0 3V
fBHI
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I ' I I

IRIT PERM OV H- 720 --'O'-'V_.o--~) INTERRUPT EN 110)

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-(IV , I I
IN84 3V
FBl40V -
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10 (1/0i lOAfABOI 4.7V (ON) : f-- : :-:
fBH8
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-11V
5V
ftAf=---.1.
I

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l3V - 11V
fBH4
1
II 110) IDATA BI~;::==~4~7~V =----"t::::;)~~+~~
BIW HEAD B SHiElD -(-----~

RIW HEAD B SHiElD -E'(C'-----------------'

RII HEAD B SHlllD «0---------- _~----J""""_ _'---_-1-
'Rm
1..
I
r-------------~
/.::>.-...... -' BITT-
(1/0) (CASSETH MOTI +- ---"4"-lV~ C>--~
RElD-__ WRITE INTERN
II
07 2SA 720'-"--J-.l!L-=-.------'~__.~
MOTH "o('----------=--!-----+'*-
0 ~ 53 • ) WRITE PERM
INHRN
READ
o • ) WRITE EN IB

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'WE PERMISSON INtiZ
= . 002V
NC V NOT-
INHRN
NO [DEVICE AVAil)
11 (110) BATT H 19
HEAD ENGAGE INHI
-12V (,HOWN IN DISENGAGE POSITION)
(1/01 veG
CII
23 (1 /01 VDO _001
VDD
Cl -3V
25 ,110) VSs I 111 VSS
+ CI CID
,I/OJ VSS2
(I/01GND I :
111
-1 1. 00 '1 ) 3VCND ' - - - - - - - - - - - - - ; . VSS
GNO 2 . CASSETTE KEY BOARD CASSETTE SWITCH WIRING

NOTE:

1. ALL VOLTAGE READINGS ARE OBTAINED WITH 3. TRANSISTOR 2N4401 :S AN ACCEPTABLE SUB.
CASSETTE TAPE DRIVE IN STANDBY AND GND STITUTE fOR TRANSI~IOR 2SC1318 (06 AND
REFERENCE OF THE VOLT METER CONNECTED Q8) •
TO GND.
4. DIODE 1N4148 IS AN ACCEPTABLE SUBSTITUTE
2. TRANSISTOR 2N4403 IS AN ACCEPTABLE SUB- FOR DIODE 51BOI-02 (CR2-CR4).
STITUTE FOR TRANSISTOR 2SA720 (QI-Q5 AND
Q7).

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 3.2 Printed Circuit Board
MOT -I BAT'- vss FBL4 Y3

FBLa •-I
vss

VGG -.·1 K X4

K Xl

FflH2

F BHl

FAH4

FRH8

VDD

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 3.3 PCB Wiring Diagram

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z z

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 3.4 Exploded Drawing

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(I, i
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....-----.-

J 1.--. "
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- -------.--

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 'S II
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d1< .......,

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 10

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 4.ADJUSTMENTS
4.1 MECHANICAL SYSTEM
4.1.' Adjusting the posItIon of the leaf switch
') Set the unit in the Stop mode Loosen the Leaf sWitch holding screw (90) and adjust so that the
leaf sWitch plastic plate is just in contact with the brake plate
21 The position of the leaf sWitch is normal if the fixed contact can be moved by an additional
'.0 - 2.0mm when it is engaged with the movable contact in READY, REWIND and FORWARD.

38

4.1.2 Adjusting the flyweel thrust

Loosen the thrust screw (plastIc screw) (63) and adjust so the thrust of the flywheel (60) IS between
0.1 - 04mm. After adjustment, fasten the thrust screw

62
63

\ o I 0 4

60

, 1

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 4.1.3 Adjusting the position of the capstan pulley
Loosen the :>crews fastenmg the pulley. While turning the flywheel put it in contact
Lower the capstan pulley as far as you can. then raise it by 03 - 05mm. FIX it
with the capstan pulley fastening screws.

4.1.4 Adjusting the height of the motor pulley

Loosen the tV'. a screws holding the motor pulley and adjust the height of the motor
motor shaft I'lfotrudes 1 -- 15mm from the top surface of the motor pulley. Aft!
fasten the m"tor pulley fastening screws

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4.1.5 Adjusting the position of the pinch roller

1) Set the unit in READY mode.
Adjust the position of the pinch roller by bending the plOch roller stopper (part)
so that the gap between the pinch roller arm (14) and the pinch roller stopper
2) After adj'Jstment check that when the READY button is pressed. take-up reel res
the pinch roller engages with the capstan.
3) Bend pinch roller arm (14) so that the plOch roller IS parallel to the capstan.

19
60

NOT CORRECT CORRECT

12

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 4.16 Adjusting the pinch roller pressure
Set the unit in the READY mode Mea~ure the pinch roller pressure at the moment when the pinch

roller (19) comes into contact with the capstan

The pinch roller pressure should be 250 - 380g

4.1 7 Adjusting the brake

(1) Set to the READY mode. Adjust by bending the brake (12) sc that the gaps between the brake
and the supply reel rest (101 and the brake and the: take up reel rest (11) are both 1 5 --- 2. Omm.
(2) Adjust by bending the brake In dlrectlO\l A so the slack In the tape is minimized when the unit is
sWitched from READY to STOP
(3) Adjust by bending the brake plate In direction B so the slack In the tape is minimized when the
unit IS sWitched from REWIND to STOP
(4) After adjustment check\hat the brake plate does not touch the reel rest during READY, FORWARD
and REWIND \ ,

I s- 20
10

.... -

13

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 5.MAINTENANCE
Maintenance of the STC-55 should be done periodically according to the following standard:
o Head clean once/day
o Pinch rolier clean once/day
0 Belt replace every 200nr
0 Pinch roller replace every 200hr
0 Idler replace every 300hr
0 Head replace every 500hr
0 Motor replace every 500hr
0 Pulley arm assembly replace every 500hr
0 REW pulley replace every 500hr
0 Reel rest replace every 500hr

CAUTION:
o Do not leave the recorder in the READY mode for more than 5 hours
o Press the STOP button Immediately when the tape has finished.
o Avoid uSing the recorder in extreme conditions.
o Use alcohol for cleaning.
o Do not use benzine or thinner for cleaning.

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 6. PARTS LIST
REF
PART NUMBER OEseR I PTI ON
NO.
1 KGC07708 Ass'y Cabinet. Upper
KGE 7961 Reflection Plate
GS-04-00053-00 Name Plate (Model No)
(,5-04-00055-00 Name Plate ( MON ROE)
2 KGB14361 Cabinet Bottom
3 KGD07726 Ass'y Cassette Door
4 KGE07727 Ass'y Bracket
5 KGE14392 Knob for Momentary Switch
6 STC14601 Screw Pan Head M3 ., 30 (ISO)
7 STC14554 Screw Bmd Head M2.6 '>( 8
8 KGE13586 Pole
9 KGC07720 Ass'y Chassis Fixing
10 KGE03406 Ass'y Reel Rest for Supply
11 KGE02624 Ass'y Reel Rest for Take up
12 KGE01818 Ass'y Brake
13 KGD07721 Ass'y Head Base Fixing
14 KGE02568 Ass'y Pinch Arm FlxlIlg
15 KGE01415 Ass'y Idler Bracket
16 KGE40827 Head 4 Track - 2 channel
17 KGE 3354 Spring
18 KGE12873 Pressure Plate for Cassette
19 KGE13934 Pinch Roller
20 KGE14396 Sprinq for pinch Arm
21 KGE07703 \ Button for Ready
22 KGD14397 \, Button
23 KGE 8155 Button Rod
24 PBEl1965 Spring for Stop Button
25 KGE 8163 Spring for Eject Button
26 KGE12653 Spring for F. F. Button
27 KGE 9763 Washer
28 KGE11632 Bracket for Motor
29 PBE11045 Washer Gum
30 PBE11121 Collar for Motor
31 KGE40562 Motor
32 KGE07151 Pulley for Motor
33 KGE11831 SWitch Rod
34 KGE13924 Rod Holder
35 KGEl1642 Inter Rock Plate
36 PBE11963 Spring for Inter Lock Plate
37 KGE13327 Spring Plate
38 KGE42083 Leaf switch
39 KGE12459 Pressul'"e- Plate for Head Base
40 KGE07422 Ass'y Idler
41 KGE02574 Ass'y Rew. PulleyLever
42 KGE13921 Spring
43 KGE01413 Ass'y Pulley Arm

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 REF
NO.
PART NUMBER DEseRI PTION

44 KGE 8081 Spring

45 KGE07413 Ass'y Rew. Lever
46 KGE 8386 Spring
47 KGE12713 Spring
48 KGD01412 Ass'y F. F. Lever
49 KGEl1957 Spring
50 KGD 7368 Inter Lever
51 PBE12018 Spacer
52 KGE14395 Spring for Slide Switch
53 KGE 8065 Eject Rod
54 KGE12707 Spring for Inter Lever
55 KGE 8405 Spring for Eject Rod
56 KGE 8406 Spring for Lach Lever
57 KGDl1646 Button Stopper
58 PBE12475 Spring for Button stopper
59 PBE11841 Eject Lever
60 KGE03424 Flywheel
61 STC19086 Screw Pan Head with Washer
62 KGE13014 Bracket for Flywheel \-
63 KGE14112 Screw Plastic
64 KGE14161 Collar
65 STC14599 Screw Flat Head M3 )( 30 (ISO)
66 KGE14055 Motor Belt
67 KGE02659 Ass'y Capstan Pulley
68 KGD14398 Skelten Switch
69 KGD14370 Bracket for Counter
70 KGE12345 Slide SWitch
71 KGE14458 Bracket for PWB
72 KGE13033 Holder for Latch lever
73 KCD13074 Counter
74 KGE14373 Counter Belt
75 KGE 1122 Washer Plastic Film
76 STC22135 Retaining Ring E2
77 STC22030 Washer 2.3 y 8 x 0.5
78 STCn147 Retaining Ring E4
79 KGE 8108 Washer Plastic Film
80 STC19077 Screw Pan Head with Washer M2 x 6
81 STC14276 Screw Pan Head M2 x 5
82 KGE15352 Washer Plastic Film
83 PBEll144 Real Cap
84 KGE 7841 Collar
I 85 STC22137 Washer 2.9 75 . 05
86 STC14269 Screw Pan Head M26 4
87 KGE 3172 Spring
88 STC22094 Washer Spring 26
89 STCn058 Washer 29 . 5 x 05
90 STC14542 Screw Pan Head M26 x 10
91 ST<...19017 Screw Pan Head with Washer M26 x 4

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 REF
NO.
PART NUMBER DESCRIPTION

92 srC22132 Wast1er 45 8 OS
93 STC22140 Retaining Ring E3
94 KGE 6778 Sp"n~ for Head Base
95 srC22134 Retaining Ring E1 5
96 STC15029 Screw Cylinder Head M2 8
97 srC70014 Terminal
98 srC19034 Screw Pan Head with Wastier M2 6
99 srC13052 Screw Self Tapping 26 6
100 srC19CJ16 Screw Pan Head with Washer M3 , 6 1150)
101 STC14543 Screw Pan Head M26 9
102 srC19015 Screw Pan Head with Washer M3 , 5 (ISOI
103 srC19026 Screw Pan Head with Washer M26 5
104 srC14250 Screw Pan Head M2 3
105 srC19077 Screw Pan Head with Washer M2 6
106 STC14540 Screw Pan Head M26 5
107 SBE 3472 Washer Fiber
lOa KGE07723 Assy PWB
KGC14402 Printed Wiring Board
KGE46103 IC N5558 V (MC1458CP) CD
KGE41379 Transistor 2SC131a@
KGE41388 Transistor 2SA 720 Q)
KGE41001 Oiode slBa 1 -02 @
KGE14454 Terminal for Test POint
KGE 6626 ReSistor Fixed Carbon Film 1 4W150 ~!J

KGE220f:s6 1 4'N510 ,!J

KGE21753 1 4W 1K,!J
KGE21761 1 4W 22K~!J

KGE'22102 1 4W 24K';J'
KGE10162 1 4W 15K"J
KGE21 793 1 4W 47K'2J
KGE22151 1 4W270K"J
KGE34067 Capacitor E!ectrolytlc 47."F 25WV
KGEJ\078 Capacitor Electrolytic 1."F 50WV
KG[32\,~ Capacitor Fixed Mica 220PF 50V
KGE33867 Capacitor CeramiC YYO 01"F 50V
KGE34732 Capacitor Ceramic YPO 01"F 50V
KGE31148 CapaCitor PlastiC Film o 11,F 50V
109 KGD07707 Assy Connector
KGD14400 Connector CANNON OB-25P
KGE14401 Junction Shell OP 51213- 1
KG014441 Cable
110 KGE14375 Bushing
111 KGE14374 Binder for Cable
112 STC19028 Screw Pan Head with Washer M3 8 (ISOi
KGE07724 Ass'y Momentary SWitch (Write On Tape)
KGE07725 Ass'y Momentary SWitch (Read On Tape)
KGE14379 Name Plate
GS-04- 00057 -00 Name Plate (serral No plate)
113 STC14254 Screw Pan Head M2 4
' - - - - _ . - - - _ . _ - - - - - - - - - ' - - _ . _.-- . . . _- .------_. __ ._-----------'
Q) IC N5558V (CD044008l) is an acceptable substitute for IC MC 1458CP
or N5558V (KGE46103).

QD Transistor 2N440l (CD1730258) can be used to substitute transistor

2SC1318 (KGE41379).

CD Transistor 2N4403 (CDl730308) can be used to substitute transistor

2SA720 (KGE41388).

~ Diode IN4148 (CD0610014) can be used to substitute diode SIBOI-02

(KGE41001).

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