Sony WM-EX570 User manual

MICROFILM
SERVICE MANUAL
CASSETTE PLAYER
AEP Model
E Model
Tourist Model
SPECIFICATIONS
WM-EX570
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-WMEX550-125
Photo: Black model
Ver 1.0 1999. 02

– 2 –
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 3
2. GENERAL ................................................................... 5
3. DISASSEMBLY ......................................................... 6
4. MECHANICAL ADJUSTMENTS....................... 11
5. ELECTRICAL ADJUSTMENTS......................... 11
6. DIAGRAMS
6-1. Block Diagram ................................................................ 12
6-2. Printed Wiring Board ...................................................... 14
6-3. Schematic Diagram ......................................................... 17
6-4. IC Pin Function Description ........................................... 23
7. EXPLODED VIEWS................................................ 25
8. ELECTRICAL PARTS LIST ............................... 28
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

– 3 –
SECTION 1
SERVICING NOTES
1. Setting
1) Refer to “3. DISASSEMBLY”, and remove the cabinet and
open the MAIN board.
2) Connect the MAIN board to the M901 (motor) and PM901
(plunger) using jumper wires.
3) Short the ATS terminals.
4) Press and fixed the S701 (CASSETTE HOLDER).
5) Supply 1.5V to the battery terminals ‘and ’using a stabi-
lized power supply.
2. FF, REW Modes
1) Input a square wave to the TP35 (PHOTO IN) and TP23
(GND). (See figure below)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S706 (FF) or S707 (REW).
3. PLAY mode
1) Input a square wave to the TP35 (PHOTO IN) and TP23
(GND). (See figure below)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S705 (PLAY). (Each time the switch is pressed, the
mode is changed over)
This set detects the rotation of GEAR (S) using the PH701 (photo
reflector). The PH701 is mounted on the MAIN board, and there-
fore the GEAR cannot be detected with the MAIN board removed.
As a result, the motor cannot be controlled, causing malfunction.
Further, the S702 (FWD/REV switch) is also mounted on the MAIN
board, and with the board removed, the mechanism position
cannnot be detected and the operation is not changed over.
Therefore, when the voltage check is executed with the MAIN
board removed, follow the procedure provided below.
Note : Do not move the S702 swithc position when removing the MAIN
board.
If it is moved, the set will not be changed over to the selected mode.
In this case, reconnect the MAIN board to the set and retry the
work from the beginning.
— MAIN BOARD (Side B) —
AF
oscillator
square wave
10 Hz, – 3.5 dB
S702
IC701
S705 (PLAY)
S704 (STOP)
TP23
(GND)
FWD
→ REV
S706 (FF)
S707 (REW)
RV601
connect to
M901 (motor)
battery terminal
PH701
TP35
PHOTO
IN
battery terminal
ATS terminals
(to S901)
connect to
PM901 (plunger)
S701
CASSETTE
HOLDER
–
+

– 4 –
Lever (SW) Rotation system
Rotation system during PLAY.
Rotation system during FF. Rotation system during REW.
senter
lever (SW)
side R side F
Pulley (reverse)flywheel (R) assy
flywheel (N) assy
gear (Y)
gear (TA)
gear (TB) gear (S) motor pulle
y
gear (REEL)
(S side)
gear (NR)
(REV: right side/
FWD: left side)
gear (REEL)
(T side)
clutch assy (M)
gear (TB)
gear (REEL)
(T side)
gear (Y)
gear (NR) motor pulley
pulley (reverse)
clutch assy (M)
flywheel (R) assy
flywheel (N) assy
gear (FR)
(FF: left side)
gear (NR)
gear (Y)
gear (S)
flywheel (N) assy flywheel (R) assy pulley (reverse)
clutch assy (M)
motor pulley
gear (REEL)
(S side)
gear (FR)
(REW: right side)

– 5 –
SECTION 2
GENERAL This section is extracted from
instruction manual.

– 6 –
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
•This set can be disassembled in the order shown below.
LID ASSY, CASSETTE
Case AssySet
Lid Assy,
Cassette Ornament Assy Belt
Holder
Motor (Capstan/Reel)
(M901)
Head, Magnetic
Main Board,
Note for Installation
1 Open the cassette lid assy
3 Remove the cassette lid assy to
direction of the arrow
A .
A
2
screw
(M1.4
× 1.6)
2 screw
(M1.4
× 2.0)

– 7 –
CASE ASSY
ORNAMENT ASSY
3 case assy
2 two claws
1 two screws
(M1.4
× 2.2)
1 two screws
(M1.4
× 2.2)
4 Remove the reel ornament to
direction of the arrow
B .
2 Push to the direction of the arrow A ,
remove the claw of knob (OPEN).
1 four claws
3
B
A

– 8 –
BELT
HOLDER
1 belt
1 Remove two
solders of battery terminal.
2 screw
3 two claws
4 holder

– 9 –
MAIN BOARD
NOTE FOR INSTALLATION
•MAIN BOARD
On installation MAIN board adjust
the S702 and lever (SW)
1 Remove four
solders of motor.
3 screw
(M1.4
× 1.6)
4 MAIN board
2 flexible boar
d
(CN301)
3 three screws
1 Remove two
solders of
plunger solenoid.
lever (SW)
S702

– 10 –
MOTOR (CAPSTAN/REEL) (M901)
HEAD, MAGNETIC
1 two screws (M1.4)
2 Remove the motor (M901) t
o
direction of the arrow.
1 two pinch levers
3 bracket ass
y
6 head, magnetic
(HP901)
4 flexible board
(CN301)
5 two screws
(M1.4
× 7.2)
2 screw
(M1.4
× 1.6)

WM-EX570
– 11 – – 12 – – 13 –
6-1. BLOCK DIAGRAM
SECTION 6
DIAGRAMS
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab: playback head pinch roller
rubber belts capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
FWD 18 – 30 g•cm
CQ-102C (0.25 – 0.41 oz•inch)
FWD 0.7 – 2.0 g•cm
Back Tension (0.006 – 0.027 oz•inch)
REV 18 – 30 g•cm
CQ-102RC (0.25 – 0.41 oz•inch)
REV 0.7 – 2.0 g•cm
Back Tension (0.006 – 0.027 oz•inch)
FF, REW CQ-201B more than 35 g•cm
(more than 0.49 oz•inch)
Tape Speed Adjustment
Procedure:
PRECAUTION
1. Specified voltage : 1.3 V (DC)
2. Setting
BL SKIP : OFF
SOUND MB/GRV : OFF
AVLS : OFF
aNR : OFF
Test tape
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Values: 2,990 to 3,010 Hz
3. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.5%
(approx.75 Hz) of the reading of step 1.
Adjustment Point:
– MAIN BOARD (Side B) –
+
–
set
Test tape
WS-48A
(3 kHz, 0 dB) frequency counte
r
16 Ω
2
REMOTE jack (J701)
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
J701
RV601
+
–
PREAMP
AGC
DET
BEEP ALC
EQ
METAL
CONTROL
SPEED
CONTROL
DIRECTION CONTROL
LED DRIVE
Q503-2
PHOTO REFLECTOR
SWITCH & BUFFER
Q701-1, 709
PLUNGER
DRIVE
Q702, 703
MUTING
CONTROL
SWITCH
Q708
LEVEL
CONTROL
Q302
MUTING
Q305
RIPPLE FILTER
Q304
RIPPLE FILTER
RESET SWITCH
Q704 RESET SIGNAL
GENERATOR
IC703
REGULATOR
IC704
MOTOR
CONTROL SWITCH
Q601, 602-1
MOTOR
BRAKE SWITCH
Q602-2
ROTATION DETECT
SENSOR
PH701
CAPSTAN/REEL
MOTOR DRIVE
IC601
SYSTEM CONTROLLER
IC701
S704 – 708
S701
(CASSETTE HOLDER)
M901
(CAPSTAN/REEL)
HP901
(PLAYBACK)
AUDIO MASTER AMP
IC301
•SIGNAL PATH
: PLAYBACK
R-CH: Same as L-CH
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
LED DRIVE
Q707-1
LED DRIVE
Q707-2
LED DRIVE
Q705
LED DRIVE
Q706-1
LED DRIVE
Q706-2
DOLBY NR AMP
CIRCUIT
AMS
MEGABASS/GROOVE
SWITCHING
Q301-2
N.F.
AVLS CONTROL
SWITCH
Q303-2
SWITCHING
REGULATOR
Q502-1
POWER CONTROL
CIRCUIT
Q501, 502-2,
Q503-1, 504
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
1PC. 1.5V
LOAD CONTROL
SWITCH
Q711
BATT B+ (1.5V)
D501
BATT B+
Q710
VOLTAGE DETECT
IC702 BATT B+
B+ (2.5V)
B+ (2.5V)
X701
32.768kHz
THP601
TAPE SPEED
RV601
START
VREF
IN+
COMPARATOR
VSP
OUT
05
VCC
DATA
REMO
GND
BATT B+
BATT B+
BATT B+
B+
BASE
PW OUT L
PW OUT R
PW OUT C
AVLS
IN
POWER
AMP
BASS BOOST
AMP
PW IN L
VOLUME
RV301
HOLD
S703
2REMOTE
J701
BUF
IN L NR OUT L
S901
(ATS)
PRE
OUT L
MTL
DRV L
IN L
FWD
IN L
REV
L-CH
R-CH
FWD
L-CH
R-CH
REV
R-CH
BLANK SKIP AMS
LEVEL CHANGE SWITCH
Q301-1
AVLS ON/OFF
SWITCH
Q303-1
R-CH
ADD ADD
R-CH
R-CH
R-CH
S702
(DIRECTION)
BATT B+
R-CH
R-CH
R-CH
R-CH
BUFFER
MIX AMP
F/R SW
PRE SW DET1 AMS OUT
4
8
7
DR
6
10
9
11
W
3
V
1
U
WV
U
19
XTB
15
XT
16
M.BRK 3
34
L.DOLBY
L.AVLS
8
L.BLSKIP
9
52
PW VCC
53
RF OUT
51
57
55
56
63
BST SW
62
AGC IN
BST IN
50
BEEP IN
60
3
PW IN C
BST
OUT
MUTE SW
46
45
59
18 1631
30
2226
F/R CTL
33
REV SW
37
FWD SW
36
AMS IN
28
DOLBY CTL
31
MUTE CTL
12
MB/GRV
CTL
41
BOOST CTL
40
M.CTL
1
L.BATT
10
VCM
•
VCP
BEEP
27
AVLS OUT PW SW
64
AVLS CTL
43
58
AMP CTL
44
DATA
30
RMUM
29
HOLDER SW
26
KEY IN
25
34
33
25 24
NR SW
19
47
ADD OUT
48
+
+
+
FWD
REV
OFF HOLD
D703
BATT
D708
aNR
D707
AVLS
D706
BL SKIP
L.MB
11
L.GRV 35
PHOTO IN 38
PHOTO CTL 14
PM CTL PM901
(PLUNGER)
Q701-2
13
M.DIR 2
B+
D705
SOUND MB
D704
SOUND GRV
SET STOP2
24
DDC CTL
32
LOAD CTL
42
RESET
Q712
19, 20
PHOTO SENSOR
CIRCUIT B+
J801
DC IN 1.5V
–+

WM-EX570
– 17 – – 18 – – 19 –
6-3. SCHEMATIC DIAGRAM • See page 20 for Waveforms, and See page 21 for IC Block Diagrams.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
•U: B+ Line.
•H: adjustment for repair.
• Total current is measured with no cassette installed.
• Powervoltageisdc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PLAYBACK
• Voltagesare takenwithaVOM(Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
E: PLAYBACK

– 20 – – 21 – – 22 –
• Waveforms
1IC701 #• (PHOTO IN)
500 mV/DIV, 50 ms/DIV
2IC701 !∞ (XTB)
200 mV/DIV, 10 µs/DIV
100 ms
1.4 Vp-p
1 Vp-p
32.768 kHz
3IC704 !§ (XT)
200 mV/DIV, 10 µs/DIV
4IC704 @º (VCP)
500 mV/DIV, 500 µs/DIV
0.7 Vp-p
32.768 kHz
1.5 Vp-p
980 µ s
5Q504 Base
200 mV/DIV, 500 µs/DIV
6Q504 Collector
200 mV/DIV, 500 µs/DIV
0.6 Vp-p
980
µ s
1.3 Vp-p
980
µ s
7Q502-1 Collector
200 mV/DIV, 500 µs/DIV
8IC601 5(OSC)
10 mV/DIV, 1 ms/DIV
1.3Vp-p
980
µ
s
21 mVp-p
1.6 ms
• IC Block Diagrams
IC301 TA2072AF
DET 2
AGC IN
RF OUT
BASE
PW VCC
PW GND
PW OUT R
PW OUT C
PW OUT L
PW SW
MUTE SW
BEEP IN
TC
BST SW
ALVS IN
AVLS OUT
BST SW
BASS
BOOST
AMP
PW
R-CH
ADD-R
ADD-L
PW
L-CH
PW C
DOLBY NR
L-CH
DOLBY NR R-CH
L-CH
R-CH
PREAMP
PREAMP
G
G
MIX AMP
EK IN L
ADD OUT BST IN PW IN C BST OUT BST NF EQ R PW NF R
RECT L
HPF L
SC IN L
NR OUT L
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
42
PRE VCC
41
PRE GND 3
40
IN R REV
39
IN R FWD
38
DC SRV R IN L FWD
37
PRE VREF
36 34
DC SRV L
35
IN L REV
3345 44 4348 4647
13
RECT R
11
PRE GND 2
12 14
HPF R
10 15
SC IN R
916
NR OUT R
8
RF IN
7
PW VREF
6
PW IN R
5
PRE GND 1
4
PW IN L
3
PW NF L
2
EQ L
1
17
BUF IN L
18
EK IN R
21
PRE SW
22
AMS HPF
23
AMS OUT
24
DET 1
25
F/R SW
26 PRE NF R
27 PRE OUT R
28
MTL DRV R
29
MTL DRV L
30
PRE OUT L
31
PRE NF L
32
NR SW
19
BUF IN R
20
C
C
D
D
B
B
H
H
EK
EK
+ – + –
+
–
+
–
+
–
PW
VREF
SW
AMS
METAL
CONTROL
PRE
VREF
RIPPLE
FILTER
AGC
DET
SW
ALC
BEEP
+ +
IC601 MM1279XVBE
V1
PW 2
W3
GND 4
OSC 5
DR 6
VREF 7
START 8
VSP 9
IN+ 10
PV
20 U
19
PU
18 GND
17 VCC
16 FC
15
TC1
14 TC2
13
R1
12 OUT
11
MOTIVE
CONTROL
CIRCUIT
MOTIVE/
OSC MOTIVE
LOGIC SOFT SWITCH
PRE DRIVER
INVERTER
BIAS
REFERENCE
VOLTAGE
SPEED
CONTROL CURRENT
CONTROL
OUTPUT
BIAS
+
–

– 23 –
6-4. IC PIN FUNCTION DESCRIPTION
•MAIN BOARD IC701 MSM6576-83GS-K (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 M.CTL O The output terminal for the control signal to start the motor
Turn the motor when set to “H”
2 M.DIR O The output terminal for selecting the rotating direction of the motor
Turn the motor counterclockwise when set to “H”, and clockwise when set to “L”
3 M.BRK O The output terminal for the brake signal to be applied to the motor
Turn the brake on when set to “H”
4 RESET I System reset signal input from the reset signal generator (IC703) “H”: reset
5 TEST1 I
6 TEST2 I The input terminal for the test (fixed at “L”)
7 TEST3 I
8 L.DOLBY O The output terminal for the LED drive signal of the aNR indicator (D708)
“H”: LED on
9 L.AVLS O The output terminal for the LED drive signal of the AVLS indicator (D707) “H”: LED on
10 L.BATT O The output terminal for the LED drive signal of the BATT indicator (D703) “H”: LED on
11 L.BLSKIP O The output terminal for the LED drive signal of the BL SKIP indicator (D706)
“H”: LED on
12 MUTE CTL O The output terminal of the muting signal “L”: mute on
13 PM CTL O The output terminal for the plunger drive signal “H”: plunger on
14 PHOTO CTL O Control signal output to the motor rotation detect circuit “H”: rotation detect circuit on
15 XTB — Connected to crystal oscillator (X701 32.768 kHz) for the system clock
16 XT — Connected to crystal oscillator (X701 32.768 kHz) for the system clock
17 VDD — Power supply terminal (+1.5V)
18 VSS1 — Ground terminal
19 VCM —
20 VCP —
21 VSS2 —
22 VEE —
23 SET STOP1 I Battery voltage detect input terminal Middle point voltage (+0.75V) input in this set
24 SET STOP2 I Battery voltage detect input terminal
25 KEY IN I Key input terminal (A/D input)
26 HOLDER SW I Cassette holder open/close detect switch (S701) input terminal
“H”: cassette holder close, “L”: cassette holder open
27 BEEP O Beep sound signal output terminal (frequency: 1.6 kHz)
28 AMS IN I AMS (Automatic Music Sensor) control signal input from the TA2072AF (IC301)
29 RMUM I Communication request signal input from the remote commander
30 DATA O Serial data output to the remote commander
31 DOLBY CTL O Dolby NR on/off control signal output to the TA2072AF (IC301) “H”: dolby NR on
32 DDC CTL O Control signal output to the DC/DC converter circuit “H”: power on
33 F/R CTL O FWD/REV selection signal output to the TA2072AF (IC301) “H”: FWD, “L”: REV
34 L.MB O The output terminal for the LED drive signal of the SOUND MB indicator (D705)
“H”: LED on
35 L.GRV O The output terminal for the LED drive signal of the SOUND GRV indicator (D704)
“H”: LED on
36 FWD SW I Tape direction switch (S702) input terminal “H”: FWD
37 REV SW I Tape direction switch (S702) input terminal “H”: REV
38 PHOTO IN I Detection signal input from the motor rotation detect circuit
Increases power supply voltage

– 24 –
Pin No. Pin Name I/O Description
39 VDD — Power supply terminal (+1.5V)
40 BOOST CTL O Bass-boost on/off control signal output to the TA2072AF (IC301)
41 MB/GRV CTL O MEGA BASS/GROOVE selection signal output to the TA2072AF (IC301)
42 LOAD CTL O Load control signal output terminal
43 AVLS CTL O AVLS (Automatic Volume Limiter System) on/off control signal output to the TA2072AF
(IC301)
44 AMP CTL O Amp on/off control signal output to the TA2072AF (IC301)

– 25 –
(1) CASE SECTION
SECTION 7
EXPLODED VIEWS
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories and packing materials are given
in the last of the electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑↑
Parts Color Cabinet's Color
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
• Abbreviation
EE : East European model
FR : French model
JE : Tourist model
1 X-3376-591-1 CASE (EX) ASSY (B) (BLACK) (EE)
1 X-3376-592-1 CASE (EX) ASSY (S) (SILVER) (EE)
1 X-3376-593-1 CASE (EX) ASSY (L) (BLUE) (EE)
1 X-3376-594-1 CASE (EX-CE) ASSY (B) (BLACK) (AEP, E, FR)
1 X-3376-595-1 CASE (EX-CE) ASSY (S) (SILVER) (AEP, E, FR)
1 X-3376-596-1 CASE (EX-CE) ASSY (L) (BLUE) (AEP, E, FR)
1 X-3376-597-1 CASE (EX-J) ASSY (B) (BLACK) (JE)
1 X-3376-598-1 CASE (EX-J) ASSY (S) (SILVER) (JE)
1 X-3376-599-1 CASE (EX-J) ASSY (L) (BLUE) (JE)
2 3-009-676-01 ORNAMENT, REEL (GRAY)...(SILVER, BLUE)
2 3-009-676-11 ORNAMENT, REEL (BLACK)...(BLACK)
3 3-930-794-11 KNOB (HOLD) (GRAY)...(SILVER, BLUE)
3 3-930-794-21 KNOB (HOLD) (BLACK)...(BLACK)
4 3-009-677-01 KNOB (OPEN)(GRAY)...(BLACK, SILVER, BLUE)
5 X-3377-126-1 LID ASSY (570/B), CASSETTE (BLACK)
5 X-3377-127-1 LID ASSY (570/S), CASSETTE (SILVER)
5 X-3377-128-1 LID ASSY (570/L), CASSETTE (BLUE)
6 3-015-995-01 SPACER (CASSETTE)
7 X-3374-205-1 HOLDER ASSY, CASSETTE (JE)
7 X-3374-439-1 HOLDER ASSY, CASSETTE (EXCEPT JE)
8 3-009-668-01 PLATE, C LOCK
9 3-704-197-41 SCREW (M1.4X2.2)(SILVER)...(BLUE, SILVER)
9 3-704-197-42 SCREW (M1.4X2.2), LOCKING
(BLACK)...(BLACK)
10 3-704-197-01 SCREW (M1.4X1.6), LOCKING
(SILVER)...(BLUE, SILVER)
10 3-704-197-02 SCREW (M1.4X1.6), LOCKING
(BLACK)...(BLACK)
11 3-704-197-11 SCREW (M1.4X2.0), LOCKING
(SILVER)...(BLUE, SILVER)
11 3-704-197-12 SCREW (M1.4X2.0), LOCKING
(BLACK)...(BLACK)
12 3-355-424-01 SCREW, TAPPING (SILVER)...(BLUE, SILVER)
12 3-355-424-71 SCREW, TAPPING (BLACK)...(BLACK)
MT-WMEX550-125
12
9
8
1
9
7
10
11 6
5
10
4
3
2
10
A
A
B
B
not supplied

– 26 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
(2) MAIN BOARD SECTION
51 3-009-669-01 TERMINAL (+), BATTERY
52 3-375-114-11 SCREW
53 3-009-670-01 TERMINAL (-), BATTERY
54 3-009-675-01 HOLDER
55 A-3061-413-A MAIN BOARD, COMPLETE (JE)
55 A-3061-558-A MAIN BOARD, COMPLETE (AEP, EE, E)
55 A-3061-606-A MAIN BOARD, COMPLETE (FR)
56 3-015-313-01 SHEET
57 3-010-520-01 COVER, SW
58 3-328-483-11 SHEET
59 3-928-465-01 DETENT, CASSETTE
60 3-012-423-01 COVER (GX), MD (EE, E, JE)
60 3-012-423-11 COVER (GX), MD (AEP, FR)
61 X-3372-850-1 PINCH LEVER (N) ASSY
62 X-3372-849-1 PINCH LEVER (R) ASSY
63 X-3373-172-1 BRACKET ASSY (JE)
63 X-3374-438-1 BRACKET ASSY (EXCEPT JE)
64 3-009-667-01 SPRING, TENTION
65 3-011-277-01 COVER (B) (Y), MD
66 3-019-716-01 SCREW (M1.4), P LOCK ACE (EXCEPT JE)
66 3-704-413-31 SCREW (M1.4X7.2) (JE)
67 3-704-197-41 SCREW (M1.4X2.2) (SILVER)...(BLUE, SILVER)
67 3-704-197-42 SCREW (M1.4X2.2), LOCKING
(BLACK)...(BLACK)
68 3-704-197-01 SCREW (M1.4X1.6), LOCKING
(SILVER)...(BLUE, SILVER)
68 3-704-197-02 SCREW (M1.4X1.6), LOCKING
(BLACK)...(BLACK)
HP901 1-500-536-11 HEAD, MAGNETIC (PLAYBACK)
J801 1-779-080-11 JACK, DC (POLARITY UNIFIED TYPE)
(DC IN 1.5 V)
S901 1-762-793-11 SWITCH, LEAF (ATS) (JE)
S901 1-762-793-21 SWITCH, LEAF (ATS) (EXCEPT JE)
not supplied
J801
S901
HP901 not supplied
62
66
64
63
68
61
60
59
68
57
55
52
54
53
52
51
67
58 65
56

– 27 –
(3) MECHANISM DECK SECTION
(MT-WMEX550-125)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
101 X-3374-094-1 CHASSIS (S) ASSY (Y) (JE)
101 X-3374-440-1 CHASSIS ASSY (J2) (EXCEPT JE)
102 3-007-457-01 SPRING (TEN), TENSION
103 3-010-954-01 SPRING (BT), COMPRESSION
104 3-010-274-11 TABLE, REEL
105 3-019-710-01 SPRING (R), TORSION
106 3-007-458-01 SPRING (H/B), TENSION
107 3-019-709-01 SPRING (N), TORSION
108 3-007-454-01 SPRING (FR), TORSION
*109 3-010-272-01 BELT, RETAINER
110 3-366-017-01 BUSHING (CAPSTAN)
111 3-007-429-01 WASHER (R), STOPPER
112 3-918-943-01 WASHER, STOPPER
113 3-007-960-01 SPRING (EJECT) (Y), TORSION
114 3-007-439-01 SLIDER (LOCK)
115 3-007-436-01 SPRING (TRIGGER), TORSION
116 X-3372-848-1 CLUTCH ASSY (M)
117 3-932-724-21 WASHER
118 3-386-694-21 WASHER
119 X-3372-852-1 FLYWHEEL (N) ASSY (JE)
119 X-3374-751-1 FLYWHEEL (N) ASSY (EXCEPT JE)
120 3-007-430-01 BELT
121 3-007-428-01 WASHER (R)
122 X-3372-851-1 FLYWHEEL (R) ASSY (JE)
122 X-3374-750-1 FLYWHEEL (R) ASSY (EXCEPT JE)
123 3-007-434-01 PULLEY (REVERSE)
124 3-029-765-01 SCREW (M1.4), TOOTHED LOCK
125 X-3372-853-1 LEVER (FRG) ASSY
126 3-007-435-01 GEAR (FR) (EXCEPT JE)
126 3-016-696-01 GEAR (FRN) (JE)
127 3-007-432-01 SHEET (R), REFLECTION
PM901 1-454-674-31 SOLENOID, PLUNGER
M901 1-698-885-11 MOTOR (CAPSTAN/REEL) (JE)
M901 1-698-885-21 MOTOR (CAPSTAN/REEL) (EXCEPT JE)
120
124
123
126
127
125
108
109
102
104
104 103
103
105
106
107
113
114
116
117
115
118
119
101
111
112
110
110
122
121
PM901
M901
not supplied
not supplied

– 28 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
A-3061-413-A MAIN BOARD, COMPLETE (JE)
A-3061-558-A MAIN BOARD, COMPLETE (AEP, EE, E)
A-3061-606-A MAIN BOARD, COMPLETE (FR)
*********************
< CAPACITOR >
C101 1-162-963-11 CERAMIC CHIP 680PF 10% 50V
(EXCEPT JE)
C101 1-164-473-11 CERAMIC CHIP 820PF 10% 50V (JE)
C102 1-162-963-11 CERAMIC CHIP 680PF 10% 50V
(EXCEPT JE)
C102 1-164-473-11 CERAMIC CHIP 820PF 10% 50V (JE)
C103 1-128-024-11 ELECT CHIP 4.7uF 20% 10V
C104 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C105 1-164-677-11 CERAMIC CHIP 0.033uF 10% 16V
C106 1-115-156-11 CERAMIC CHIP 1uF 10V
C107 1-162-965-11 CERAMIC CHIP 0.0015uF 10% 50V
C108 1-128-014-11 ELECT CHIP 10uF 20% 4V
C109 1-164-174-11 CERAMIC CHIP 0.0082uF 10% 25V
C110 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C111 1-107-823-11 CERAMIC CHIP 0.47uF 10% 16V
C112 1-115-156-11 CERAMIC CHIP 1uF 10V
C113 1-115-156-11 CERAMIC CHIP 1uF 10V
C114 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C115 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C116 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C117 1-115-156-11 CERAMIC CHIP 1uF 10V
C201 1-162-963-11 CERAMIC CHIP 680PF 10% 50V
(EXCEPT JE)
C201 1-164-473-11 CERAMIC CHIP 820PF 10% 50V (JE)
C202 1-162-963-11 CERAMIC CHIP 680PF 10% 50V
(EXCEPT JE)
C202 1-164-473-11 CERAMIC CHIP 820PF 10% 50V (JE)
C203 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C204 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C205 1-164-677-11 CERAMIC CHIP 0.033uF 10% 16V
C206 1-115-156-11 CERAMIC CHIP 1uF 10V
C207 1-162-965-11 CERAMIC CHIP 0.0015uF 10% 50V
C208 1-128-014-11 ELECT CHIP 10uF 20% 4V
C209 1-164-174-11 CERAMIC CHIP 0.0082uF 10% 25V
C210 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C211 1-107-823-11 CERAMIC CHIP 0.47uF 10% 16V
C212 1-115-156-11 CERAMIC CHIP 1uF 10V
C213 1-115-156-11 CERAMIC CHIP 1uF 10V
C214 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C215 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C216 1-115-156-11 CERAMIC CHIP 1uF 10V
C217 1-115-156-11 CERAMIC CHIP 1uF 10V
C220 1-162-953-11 CERAMIC CHIP 100PF 5% 50V
C301 1-135-316-11 TANTALUM CHIP 22uF 20% 2.5V
C302 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C303 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C304 1-128-024-11 ELECT CHIP 4.7uF 20% 10V
C305 1-135-316-11 TANTALUM CHIP 22uF 20% 2.5V
C306 1-110-423-11 ELECT CHIP 2.2uF 20% 25V
C307 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C308 1-135-180-21 TANTALUM CHIP 3.3uF 20% 6.3V
C309 1-115-156-11 CERAMIC CHIP 1uF 10V
C310 1-115-156-11 CERAMIC CHIP 1uF 10V
C311 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C312 1-109-935-11 TANTALUM CHIP 4.7uF 20% 4V
C313 1-135-201-11 TANTALUM CHIP 10uF 20% 4V
C314 1-107-823-11 CERAMIC CHIP 0.47uF 10% 16V
C315 1-115-156-11 CERAMIC CHIP 1uF 10V
C316 1-115-156-11 CERAMIC CHIP 1uF 10V
C317 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C318 1-135-149-21 TANTALUM CHIP 2.2uF 20% 10V
C319 1-107-688-11 TANTALUM CHIP 1.5uF 20% 10V
C320 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C321 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C322 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C323 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C324 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C325 1-162-953-11 CERAMIC CHIP 100PF 5% 50V
C326 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C327 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C501 1-135-201-11 TANTALUM CHIP 10uF 20% 4V
C502 1-135-201-11 TANTALUM CHIP 10uF 20% 4V
C601 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C602 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C603 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C604 1-107-826-91 CERAMIC CHIP 0.1uF 10% 16V
C605 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C606 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C607 1-107-826-91 CERAMIC CHIP 0.1uF 10% 16V
C608 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C701 1-115-156-11 CERAMIC CHIP 1uF 10V
C702 1-115-156-11 CERAMIC CHIP 1uF 10V
SECTION 8
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts speci-
fied in the diagrams or the components used
on the set.
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
• Abbreviation
EE : East European model
FR : French model
JE : Tourist model
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order-
ing these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA. . : µA. . uPA. . : µPA. .
uPB. . : µPB. . uPC. . : µPC. .
uPD. . : µPD. .
• CAPACITORS
uF: µF
• COILS
uH: µH
The components identified by
mark !or dotted line with mark
!are critical for safety.
Replace only with part number
specified.
When indicating parts by reference
number, please include the board.
MAIN