Sony Walkman WM-EX422 User manual

WM-EX422
SERVICE MANUAL
SPECIFICATIONS
E Model
Model Name Using Similar Mechanism NEW
MD Mechanism Type MF-WMFX495-147
9-877-095-02
2003L02-1
© 2003.12
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
CASSETTE PLAYER
Ver 1.1 2003.12
• Frequency response
Playback: 30 - 18 000 Hz
• Output
Headphones (i) jack Load impedance 8 - 300 Ω
• Power requirements
1.5V DC, battery R6 (AA) x 1
• Dimensions (w/h/d)
Approx. 111.2 x 81.1 x 29.5 mm (4 1⁄2x 3 1⁄4x1 3⁄16 in.), excl.
projecting parts and controls
• MassApprox. 124 g (4.4 oz) (main unit only)
• Supplied accessories
Stereo headphones or earphones (1)
Hand strap (1) (European model only)
Carrying pouch (1) (Asian model only)
Design and specifications are subject to change without notice.
Battery life* (approximate hours)
Sony alkaline LR6 (SG)** Sony R6P (SR)
Tape playback 35 9
* Measured value by the standard of JEITA (Japan Electronics and
Information Technology Industries Association).
(Using a Sony HF series cassette tape)
**When using a Sony LR6(SG) “STAMINA” alkaline dry battery
(produced in Japan).
Note
• The battery life may be shorter depending on the operating condition, the
surrounding temperature and battery type.

2
WM-EX422
Specifications ........................................................................... 1
1. SERVICING NOTE ...................................................... 3
2. GENERAL ...................................................................... 4
3. DISASSEMBLY
3-1. Cabinet (Front)Sub Assy ............................................ 5
3-2. Main Board ................................................................. 6
3-3. Mechanism Deck ........................................................ 6
3-4. Cassette Holder Sub Assy ........................................... 7
4. ADJUSTMENTS
4-1. Mechanical Adjustments ............................................ 8
4-2. Electrical Adjustments ................................................ 8
5. DIAGRAMS
5-1. Block Diagram ............................................................ 9
5-2. Printed Wiring Boards .............................................. 10
5-3. Schematic Diagram ....................................................11
5-4. IC Block Diagrams ................................................... 12
6. EXPLODED VIEWS
6-1. Cabinet Section ......................................................... 13
6-2. Mechanism Deck Section
(MF-WMFX495-147) ....................... 14
7. ELECTRICAL PARTS LIST ................................... 15
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270°C during
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

3
WM-EX422
SECTION 1
SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S) using the
photo reflector (PH751). The PH751 is mounted on the MAIN
board, therefore the idler gear (A) (side S) cannot be detected with
the MAIN board removed. As a result, the motor (M601) cannot
be controlled, causing malfunction.
Further, the MD switch (S601) is also mounted on the MAIN board,
and with the board removed, the mechanism position cannot 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.
1. Setting
1) Refer to “3. DISASSEMBLY”, and remove the MAIN board.
2) Connect the MAIN board to the motor (M601) using jumper
wires. These can be connected easily with the use of the
extension tool (Part No. 1-769-143-11) (ten in one set).
3) Connect the AF oscillator to the TP52 and the BT401 (BATT–
).
4) Supply 1.5 V to the battery terminals using the regulated power
supply.
2. Preset state
To set the PLAY, FF, REW modes, the preset state must be set.
1) Check that the slider (NRA) and the MD switch (S601) are set
to the center position. If not, set the preset state as follow.
2) Move the MD switch (S601) to the side, which the slider (NRA)
is facing.
3) The slider (NRA) will move when the regulated power supply
switch is set to OFF once and then set to ON. Move the MD
switch (S601) according to this timing and set to the center
position.
3. FF, REW modes
1) Check that the preset state is set.
2) Input the square wave or sine wave to the TP52 and the BT401
(BATT–).
3) Press the [FF] button or [REW] button .
4. PLAY mode
1) Check that the preset state is set.
2) Input the square wave to the TP52 and the BT401 (BATT–).
3) Press the Ybutton will move the slider (NRA) once towards
the side REV and then to the side FWD. Move the MD switch
(S601) according to this timing will set the PLAY mode (side
FWD). Press the Ybutton another time for a second and
move the MD switch (S601) according to the movement of
the slider (NRA) will set the PLAY mode (side REV).
Note 1: If the above fails, perform from preset again.
Note 2: When using headphones, the timing for move the MD
switch (S601) can be determined from the beep sound.
S601
(MD CONT)
BT401
FF
FWD
t
RVS
REW
tt
PH751
TP52
(PHOTO)
connect to themotor (M601)
battery
terminal
3
battery terminal #
AF oscillator
square wave
2 Hz, 2 VdB
2Vp-
p
— MAIN Board (Component Side) — — MAIN Board (Conductor Side) —

4
WM-EX422
SECTION 2
GENERAL
This section is extracted from
instruction manual.
OPEN
AVLS
BATT
VOL**
FF
Y•DIRECTION***
HOLD
MEGA BASS
x
REW
*Supplied with the European model only.
** There is a tactile dot beside VOL to show the direction to turn up the volume.
*** The button has a tactile dot.
i
To attach the hand strap*

5
WM-EX422
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (FRONT) SUB ASSY
zThe equipment can be removed using the following procedure.
MAIN boardCabinet center
Cassette holder sub assy
Mechanism deck
Set
Cabinet (front) sub assy
8 Cabinet (front) sub ass
y
6 Claws
5 Claws
7
1
2 Screw (B 1.7 × 9), tapping
4 Claws
3 Screw (B 1.7 × 9), tapping
Cabinet center

6
WM-EX422
3-3. MECHANISM DECK
3 Mechanism deck
Cabinet (center) ass
y
1 Claws
2
3-2. MAIN BOARD
Cabinet (center) assy
1 Unsolder HEAD flexible board
3 Screw (1.7 × 2.5), tapping
2 Unsolder leads from moto
r
(four places)
6 MAIN board
5
4 Claws

7
WM-EX422
3-4. CASSETTE HOLDER SUB ASSY
Cassette holder sub assy
Cabinet center
3 Spring (lid up)
4 Cassette holder sub ass
y
Cabinet center
• Use caution when installing the cassette holder assy
Install the cassette holder sub assy with the spring (lid up)
as shown below in the drawing so that it fits into the holes
on the cabinet center. Once installed, fit the left and right
pieces on.
• Press on the left & right clips from the rear of the
cabinet center and remove the boss.
2
1

8
WM-EX422
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head pinch roller
capstan rubber belt
2. Demagnetize the playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
3. These measurement and adjustment should be performed with
the rated power supply voltage (1.5 V) unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
FWD
1.97 – 4.11 mN • m
20 – 42 g • cm
(0.28 – 0.58 oz• inch)
FWD
CQ-102C less than 0.19 mN • m
less than 2 g • cm
back tension (less than 0.027 oz• inch)
1.97 – 4.11 mN • m
REV 20 – 42 g • cm
(0.28 – 0.58 oz• inch)
REV
CQ-102RC less than 0.19 mN • m
less than 2 g • cm
back tension (less than 0.027 oz• inch)
FF, REW CQ-201B
more than 5.89 mN • m
more than 60 g • cm
(more than 0.84 oz• inch)
SECTION 4
ADJUSTMENTS
4-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
•Supplied voltage : 1.5V.
•Switch and control position
MEGA BASS : NORMAL
VOLUME control (RV301) : maximum
AVLS : OFF
HOLD : OFF
PB EQ : NORMAL
TAPE SECTION
Test Tape
Type Signal Used for
WS-48A 3kHz, 0dB Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
1. Playback WS-48A (tape center part) in the FWD state and ad-
just RV601 so that the frequency counter reading becomes
2,985Hz.
Standard value : 2,970–3,000Hz
2. Playback WS-48A (tape center part) in the REV state.
Check that frequency counter reading is within ±1.5% of the
reading of step 1.
Adjustment Location :
0 dB = 0.775V
MAIN BOARD (SIDE B)
RV601 : Tape speed adjustmen
t
set
test tape
WS-48A
(3kHz, 0dB)
frequency counte
r
16 Ω
phones jack (J301)

99
WM-EX422
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAMS
Q302
REF
MOTOR BLEAK
SWITCH
Q600–602
MUTE
RF & RET
37
829 19
10
22
7
41
42
16
39
29
28
36
9
12 12
13
11
15
38
13
5
21 18
30
4
1
5
25 16
16
26
VBAT
VBAT
Q703
VBAT
VCC
W
START
V
U
W
COM
V
U
VCC
L-CH
R-CH
FWD
R-CH
L-CH
REV
3
1
19
DRIVER
CONTROL
PRE
DRIVER
10 7
8
VREF
VREF
Q101
Q305
AVLS
IC301
PRE/POWER
AMP
Q201
Q202
Q102
Q604
INA
INB
RF
OUT
VREF
BASE VCC
VREF
Q301
INV.
PRE
OUTA
PRE
OUTB
RV301
VOL
R-CH
PW
IN A
PW
IN C
BST OUT
BST SW PW NFA
PW NFB
OUTA
OUTC
PW MUTE
PRE MUTE
R-CH
MUTE
F/R CTRL
BATT DET
14
BATT RET
BATT IN
TAPE DET
21
VDD1
23
VDD
VCC
IC701 (2/2)
SYSTEM
CONTROL
IC703
RESET
IC701 (1/2)
SYSTEM
CONTROL
IC601
CAPSTAN/REEL
MOTOR DRIVE
IN-PHOTO
1FWD SW
2FF SW
3REW SW
4REV SW
+2.5V
BATT_CTL2
BATT_CTL3
NC
KEY_IN
ENDRESS MODE
XTO
XTI
BEEP
Q303
EQ SWITCH
X701
32.768KHz
R-CH R-CH
RV601
TAPE SPEED
S705
REW
S704
FF
S702
x
S703
Y
DIRECTION
S701
HOLD B
ON
R
OFF
IN+
M601
CAPSTAN/REEL
MOTOR
S301
TAPE DET
BATT 1.5V
DRY BATTERY
SIZE"AA"
(IEC DESIGNATION LR6)
1PS,1.5V
HP601
PLAY BACK HEAD
J301
i
VBAT
17 AMP_CTRL
10 PRE-AMP CTRL
6MOTOR CTRL
8MOTOR SPEED
7MOTOR BLK
Q603
4OUT
3
CE
4
LX
IC702
+2.5V
SWITCHING REG
2VOUT
2
VIN
IC704
+1.3V REG
3VCEN
VBAT
+2.5V
+2.5V
+1.3V
+1.3V
+1.3V
43
+2.5V
D701
(BATT)
VBAT
S302
AVLS
OFF tON
S303
MEGA BASS
ON tOFF
S601
(MD CONT)
FWD
r
FF
r
REW
r
REV
GATE
Q751
+2.5V
PH751
9PHOTO CTRL
VBAT VBAT
• Signal Path
: PB
• R-CH is omitted due to same as L-CH.

1010
WM-EX422
12
(12)
1-687-633-
MAIN BOARD (SIDE B)
12
(12)
1-687-633-
(SIDE A)
MAIN BOARD
TP15
TP57
TP610
BP1
R734
D711
S704
FF
R312
R719
C703
S601
(MD CONT)
S303
MEGA BASS
IC701
RV601
R112
C708
C704
C705
C707
R718
R717
R731
R714
R726
R715
R721
R707
R728
C706
Q202
Q600
R730
R709
R704
R701
R724
R705
IC703
C711
R740
R741
C111
R702
X701
Q601
S701
D713
R729
FB101
R114
R723
R727
R708
R732
R716
1
12
13
24
25 36
37
48
R302
R706
R338
R722
C331
Q101
Q602
R733
R213
R303
FB301
R212
R301
R742
FB201
R337
R214
R113
D701
Q301
R713
S705
REW
Q201
R710
Q102
R336
R725
D702
C701
R700
L701
C702
IC702
IC704
S703
CN101
S702
C709
C211
RB601
Q603
BT401
RV301
J301
L
FWD
R
L
REV
R
HP601
PLAYBACK
HEAD
ON
OFF
t
B
HOLD
W
V
U
COM
M601
CAPSTAN/REEL
MOTOR
FF
FWD
t
RVS
REW
tt
ON OFF
t
ON
OFF
t
S302
AVLS
x
B
B
B
B
DIRECTION
i
C323
R610
R605
R611
S301
(TAPE SW)
C608
R209
PH751
R207
C106
C201
C103
R751
R208
C110
R720
R305
R211
C322
R107
C610
R603
R110
1
15
16
30
C108
C107
R204
C310
R109
Q302
R311
C109
C207
C104
C308
C203
R206
C330
C312
R755
R210
R106
Q703
Q303
C304
IC301
C306
C208
C316
R111
R203
C325
R103
C210
R306
R330
C301
R104
R108
R609
C101
R105
C204
C324
Q305
BEB
C C
C305
R333
C307
C209
R331
C206
R205
C601
IC601
C605
R602
C604
C602
R604
C603
TH601 Q604
C309
R601
Q751
C606
110
11
20
R752
R310
C607
RB102
RB101
C311
C100
123
54
N
VOL
1
1
3
3
4
4
5
5
TP52
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION LR6)
1PC, 1.5V
23 4 5 6 7 89 10
A
1
B
C
D
E
F
G
5-2. PRINTED WIRING BOARDS
Ref. No. Location
zSemiconductor
Location
D701 D-9
D702 F-8
D711 E-6
D713 B-9
IC301 C-2
IC601 F-2
IC701 E-7
IC702 F-7
IC703 F-7
IC704 F-7
PH751 D-2
Q101 D-6
Q102 D-6
Q201 D-6
Q202 D-6
Q301 D-6
Q302 B-1
Q303 B-3
Q305 D-2
Q600 E-9
Q601 E-9
Q602 E-9
Q603 E-8
Q604 F-2
Q703 B-1
Q751 E-2
zSee page 12 for Notes.

1111
WM-EX422
5-3. SCHEMATIC DIAGRAM zSee page 12 for Notes.
R338
R337
R336
Q101
Q201
Q202
Q102
R302
R301
R303
RB102 RB101
R207
R108
R107
R206
C203
R204
C204
R203
R103
R106
C103
C322 C324
R112
C106 C206
C208
C108
C330
R210
R110
R311
R333
R331
R330
C323
C101
C201 R211
R111
Q305
C308
C309
C307
C306
C304
C312
C325
R312
R113 R213
C331
FB 201
FB 101
FB 301
R728 D713
R611
R610
R609
C608
C606
C604
R602
C602
C603
R601
C601
C607
Q604
TH601
C605
D712
Q600
Q602
Q601
RB601
R721
R722
C100
R734
R720
C709
R717
R730 R731 R732 R733
R718
R716
R708
R700
S704 S705
R715
R729
R713
R709
R710
R719
R714
R706
R707
X701 C703
C705
C704
TP51
TP45
R701
R702
C711
R705
TP16
PH751
R751
C708
D702
C702
C301
C109
R109
R310
R209
C209
C310
C706
C707
D711
R704
TP60
R755 R752
R740
R742
R741
R724
R726
R725
C211
C111 C107
C207
CN101
S703
DIRECTION
S702
S701
HOLD
J301
R723
L701
100µH
R114
R214
C316
S302
D701
C305
R208
R104
C104
C311
C110 C210
R603
C701
IC301
IC703
IC702
IC704
IC701
Q603
Q302
Q303
Q751
M601
TP 52
Q301
RV301 S303
R305
C610
R604
R605
RV601
Q703
S301
S601
R212
IC601
R727
C314
R205
R105
1k
10k
10k
2A136 2-Y
2A1362-Y
2SA1362-Y
2SA1362-Y
100k
100k
100k
47k 22k
22k
10k
22k
100k
4700p
470
22
4V
470k
470k
100k
4700p
1000p 22
4V
1k
11
1000p
1000p
1
1k
1k
100k
22
1k
1k
2.2
470p
470p 100k
100k
XP1116-TX
AVLS CONTROL
SWITCH
0.22
0.1
1
2.2
10
6.3V
2.2
2.2
10k
4.7k 4.7k
0.047
0MA8062
220k
220k
220k
0.01
0.01
0.1
100
0.1
0.22
22k
1
0.01
UN5215
SPEED CONTROL
SWITCH
3.3K
0.1
MA8062
2SA1036KT146Q
2SA1036KT146Q
2SA1036KT146Q
470
10k
100k
330
2V
0
1k
2.2
470k
0.5%
470k
(0.5%)470k
(0.5%)
470k
(0.5%)
220k
(0.5%)
470k
0.5%
100k
0.5%
220k
0.5%
100k
0.5%
FF REW
4.7k
(0.5%)
220
(0.5%)
1k
(0.5%)
1k
(0.5%)
4.7k
(0.5% )
2.2k
(0.5%)
1k
(0.5%)
100k
(0.5%)
10k
(0.5%)
32.768KHz 10p
1
0.1
RESET
BEEP
220k
(0.5%)
470k
(0.5%)
1
10k
VDD
NJL5197K-W
ROTATION DEFECT
SENSOR
2.2k
1
ISS367-T3SONY
10
10V
22
4V
0.22
4.7
4.7
4.7
0.22
0.22
1
1
MA8062
470k
ENDLESS MODE
220k 470k
4.7k
1k
2.2k
470k
470k
470k
2.2
2.2 2.2
2.2
470k
0
0
1
SML-310LTT86
0.1
10k
470
22
4V
4.7
11
10k
22
6.3V
TA2160FN
PRE/POWER
AMP
PST9008
RESET
XC6371C251PL
+2.5V
SWITCHING REG
S-81211SG
+1.3V REG
ML63512-CFX1749
SYSTEM CONTROL
UN5216-(TX)
INV.
2SA1362-Y
REF
FMW1T148
EQSWITCH
U5215
GATE
PHOTO
2SC2712-YG-TE85L
10k/10k
470k
1
1k
4.7k
4.7k
2SB815B7-TB
B+ SWITCH
(TA PE DET)
(MD CONT)
1k
MM1279XVBE
CAPSTAN/REEL
MOTOR DRIVE
1k
2.2
100
100
0uH
0uH
0uH
AVLS
BATT
HEAD
PLAYBACK
HP601
FWD/REV
SWITCH
MOTOR
CAPSTAN/R
EEL
Q101,102,201,202,301
VOL MEGA BASS
TAPE
SPEED
DRY BATT
ERY
SIZE"AA"
(IEC D
ESIGNATION LR6)
1PC,1.5V

1212
WM-EX422
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 speci-
fied.
•C: panel designation.
•: B+ Line.
•H: adjustment for repair.
•Power voltage is dc 1.5V and fed with regulated dc power
supply from battery terminal.
•Voltages and waveforms are dc with respect to ground under
no-signal (detuned) conditions.
•no mark : PLAY
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
•Circled numbers refer to waveforms.
•Signal path.
E: PB
Note on Printed Wiring Board
•X: parts extracted from the component side.
•a: Through hole.
•: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
zWaveforms
1
IC701 9VOLT/DIV : 1V AC
TIME/DIV : 20msec
PHOTO CTRL
1.0 Vp-
p
125msec
2
IC701 wl
XT1
VOLT/DIV : 0.5V AC
TIME/DIV : 10 µsec
1.3Vp-p
32.768 kHz
5-4. IC BLOCK DIAGRAMS
IC301 TA2160FN (EL)
12 13 14
19
15
8910
PRE OUT B
BST SW
PW INA
PW NFB
PW INB
PW MUTE
PRE MUTE
AGC DET
PW GND
PW NFA
14
2356
PRE NFB
PRE NFA
PRE OUT A
VREF
PRE GND
7
RF & REF
BST SW
AGC DET
AGC
18 17 16
20
LPF
VREF IN
BSF NF
IN B
IN A
RF IN
BASE
BST OUT
PW INC AGC IN OUT A OUT C OUT B VCC
RF OUT
30 29 27
28 23
24
25
26 22 21
11
PRE B PRE A
BST
PW A PW B
PW C
IC601 MM1279XVBE
+
11
13
14
15
16
17
18
20
1
2
3
4
5
6
7
8
9
10
19
12
PRE
DRIVER
SOFT
SWITCH
MOTIVE
LOGIC
MOTIVE
/OSC
BIAS
REFERENCE
VOLTAGE
MOTIVE
CONTROL
CIRCUIT
INVERTER
SPEED
CONTROL
CURRENT
CONTROL
OUTPUT
BIAS
PV
V
PW
W
GND
OSC
DR
VREF
START
VSP
IN+
U
PU
GND
VCC
FC
TC1
TC2
R1
OUT

WM-EX422
13
SECTION 6
EXPLODEDVIEWS
NOTE :
•-XX, -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
•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 number in the
exploded views are not supplied.
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
6-1. CABINET SECTION
13 19
17
18
11
10
98
6
5
14
3
423
22
MF-WMFX495-147
not
supplied
12
16
15
12
20
21
13-252-515-01 KNOB, AVLS
23-252-514-01 KNOB, MEGA BASS
3A-3608-881-A CABINET (FRONT) SUB ASSY
43-252-498-01 LID, BATTERY
5X-3383-898-1 LEVER OPEN ASSY
63-349-825-11 SCREW
83-022-856-01 SPRING (KNOB), TENSION
93-704-197-91 SCREW (M1.4X1.8), LOCKING
10 3-019-422-03 JOINT
11 3-252-499-01 KNOB, OPEN (SILVER)
11 3-252-499-11 KNOB, OPEN (BLUE)
12 3-252-500-01 KNOB (HOLD) (SILVER)
12 3-252-500-11 KNOB (HOLD) (BLUE)
13 3-252-494-21 CABINET CENTER (SILVER)
13 3-252-494-31 CABINET CENTER (BLUE)
14 3-318-203-91 SCREW (B1.7X9), TAPPING
15 X-3383-384-1 HOLDER SUB ASSY, CASSETTE (SILVER)
15 X-3383-385-1 HOLDER SUB ASSY, CASSETTE (BLUE)
16 3-025-276-02 SPRING (LID UP)
17 3-039-661-01 LOCKER (OPEN)
18 3-375-114-21 SCREW (1.7X2.5), TAPPING
19 3-245-293-01 SPRING (CASSETTE)
20 3-252-508-01 TERMINAL BATTERY (+)
21 3-252-510-01 TERMINAL BATTERY (-)
*22 A-3683-587-A MAIN PC BOARD ASSY
23 3-010-838-22 LOCK, SERRAT IB
•Hardware (# mark) list and accessories and
packing materials are given in the last of
this parts list.
Ver 1.1

14
WM-EX422
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
6-2. MECHANISM DECK SECTION
(MF-WMFX495-147)
103
102
102
104
117
106
105
117
107
108
109
110
120
111
112
118
119
M601
113
114
116
116
119
118
115
101
HP601
not supplied
not supplied
101 X-3375-020-2 PINCH LEVER (N-F) ASSY
102 X-3372-619-3 WHEEL ASSY (NP), CAPSTAN
103 3-354-868-01 BELT
104 3-021-950-02 GEAR (DF)
105 3-021-982-01 SPRING (MODE), COMPRESSION
106 X-3375-024-4 CLUTCH ASSY (F)
107 3-021-951-02 GEAR (CAM)
108 3-348-953-21 WASHER
109 3-021-979-02 SPRING (UDF), COMPRESSION
110 3-021-949-01 GEAR (BF)
111 X-3375-022-7 CHASSIS ASSY (F)
112 3-021-974-04 SPRING (HEAD BASE)
113 3-704-197-01 SCREW (M1.4), SPECIAL HEAD
114 X-3375-021-3 PINCH LEVER (R-F) ASSY
115 3-704-197-71 SCREW (M1.4)
116 3-921-797-01 WASHER
117 3-338-647-31 WASHER (1.0-2.5)
118 3-022-100-01 SPRING (B.T.), COMPRESSION
119 3-024-223-11 GEAR (REEL-2)
120 X-3375-268-1 GEAR (AF-SV) ASSY
HP601 1-500-648-11 HEAD, MAGNETIC (PLAYBACK)
M601 1-763-798-11 MOTOR, DC (CAPSTAN/REEL)

15
WM-EX422
SECTION 7
ELECTRICAL PARTS LIST MAIN
NOTE :
•Due to standardization, replacements in the
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
•-XX, -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
•Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
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
When indicating parts by reference num-
ber, please include the board.
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
*A-3683-587-A MAIN PC BOARD ASSY
*****************
< CAPACITOR >
C100 1-126-236-11 ELECT 330uF 20% 2V
C101 1-162-962-11 CERAMIC CHIP 470PF 10% 50V
C103 1-162-968-11 CERAMIC CHIP 0.0047uF 10% 50V
C104 1-104-847-11 TANTAL. CHIP 22uF 20% 4V
C106 1-115-156-11 CERAMIC CHIP 1uF 10V
C107 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C108 1-115-416-11 CERAMIC CHIP 0.001uF 5% 25V
C109 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C110 1-164-227-91 CERAMIC CHIP 0.022uF 10V
C111 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C201 1-162-962-11 CERAMIC CHIP 470PF 10% 50V
C203 1-162-968-11 CERAMIC CHIP 0.0047uF 10% 50V
C204 1-104-847-11 TANTAL. CHIP 22uF 20% 4V
C206 1-115-156-11 CERAMIC CHIP 1uF 10V
C207 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C208 1-115-416-11 CERAMIC CHIP 0.001uF 5% 25V
C209 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C210 1-164-227-11 CERAMIC CHIP 0.022uF 10V
C211 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C301 1-104-847-11 TANTAL. CHIP 22uF 20% 4V
C304 1-104-851-11 TANTAL. CHIP 10uF 20% 10V
C305 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C306 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C307 1-125-837-91 CERAMIC CHIP 1uF 10% 6.3V
C308 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C309 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C310 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C311 1-117-720-11 CERAMIC CHIP 4.7uF 10V
C312 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C316 1-115-156-11 CERAMIC CHIP 1uF 10V
C322 1-115-416-11 CERAMIC CHIP 0.001uF 5% 25V
C323 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C324 1-104-847-11 TANTAL. CHIP 22uF 20% 4V
C325 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C330 1-115-156-11 CERAMIC CHIP 1uF 10V
C331 1-165-176-11 CERAMIC CHIP 0.047uF 10% 16V
C601 1-125-837-91 CERAMIC CHIP 1uF 10% 6.3V
C602 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C603 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C604 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C605 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C606 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C607 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C608 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C610 1-115-156-11 CERAMIC CHIP 1uF 10V
C701 1-119-750-11 TANTAL. CHIP 22uF 20% 6.3V
C702 1-104-851-11 TANTAL. CHIP 10uF 20% 10V
C703 1-162-915-11 CERAMIC CHIP 10PF 0.5PF 50V
C704 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C705 1-115-156-11 CERAMIC CHIP 1uF 10V
C706 1-115-156-11 CERAMIC CHIP 1uF 10V
C707 1-115-156-11 CERAMIC CHIP 1uF 10V
C708 1-115-156-11 CERAMIC CHIP 1uF 10V
C709 1-135-834-91 CERAMIC CHIP 2.2uF 6.3V
C711 1-115-156-11 CERAMIC CHIP 1uF 10V
< DIODE >
D701 8-719-064-07 DIODE SML-310LTT86 (BATT)
D702 8-719-049-09 DIODE 1SS367-T3SONY
D711 8-719-422-58 DIODE MA8062
D713 8-719-422-58 DIODE MA8062
< FERRITE BEAD >
FB101 1-469-125-21 FERRITE 0UH
FB201 1-469-125-21 FERRITE 0UH
FB301 1-469-125-21 FERRITE 0UH
< IC >
IC301 6-701-831-01 IC TA2160FN(EL)
IC601 8-759-356-46 IC MM1279XVBE
IC701 6-802-989-01 IC ML63512-CFX1749
IC702 8-759-566-77 IC XC6371C251PL
IC703 8-759-430-08 IC PST9008NL
IC704 8-759-280-84 IC S-81211SG-QA-T1
< JACK >
J301 1-580-680-11 JACK (i)
< COIL >
L701 1-412-032-11 INDUCTOR CHIP 100uH
< REFLECTOR >
PH751 8-749-016-61 REFLECTOR NJL5197K-W-F20(TE1)
< TRANSISTOR >
Q101 8-729-230-72 TRANSISTOR 2SA1362YG
Q102 8-729-230-72 TRANSISTOR 2SA1362YG
Q201 8-729-230-72 TRANSISTOR 2SA1362YG
Q202 8-729-230-72 TRANSISTOR 2SA1362YG
Q301 8-729-230-49 TRANSISTOR 2SC2712-YG

16
WM-EX422
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
MAIN
Q302 8-729-230-72 TRANSISTOR 2SA1362YG
Q303 8-729-903-10 TRANSISTOR FMW1
Q305 8-729-425-94 TRANSISTOR XP1116-TXE
Q600 8-729-901-97 TRANSISTOR 2SA1036K-Q
Q601 8-729-901-97 TRANSISTOR 2SA1036K-Q
Q602 8-729-901-97 TRANSISTOR 2SA1036K-Q
Q603 8-729-421-28 TRANSISTOR UN5216
Q604 8-729-420-50 TRANSISTOR UN5215
Q703 8-729-800-71 TRANSISTOR 2SB815B7-TB
Q751 8-729-420-50 TRANSISTOR UN5215
< RESISTOR >
R103 1-216-853-11 METAL CHIP 470K 5% 1/10W
R104 1-216-817-11 METAL CHIP 470 5% 1/10W
R105 1-216-817-11 METAL CHIP 470 5% 1/10W
R106 1-216-845-11 METAL CHIP 100K 5% 1/10W
R107 1-216-837-11 METAL CHIP 22K 5% 1/10W
R108 1-216-833-11 METAL CHIP 10K 5% 1/10W
R109 1-216-793-11 METAL CHIP 4.7 5% 1/10W
R110 1-216-821-11 METAL CHIP 1K 5% 1/10W
R111 1-216-845-11 METAL CHIP 100K 5% 1/10W
R112 1-216-821-11 METAL CHIP 1K 5% 1/10W
R113 1-216-829-11 METAL CHIP 4.7K 5% 1/10W
R114 1-216-864-11 SHORT 0
R203 1-216-853-11 METAL CHIP 470K 5% 1/10W
R204 1-216-817-11 METAL CHIP 470 5% 1/10W
R205 1-216-817-11 METAL CHIP 470 5% 1/10W
R206 1-216-845-11 METAL CHIP 100K 5% 1/10W
R207 1-216-837-11 METAL CHIP 22K 5% 1/10W
R208 1-216-833-11 METAL CHIP 10K 5% 1/10W
R209 1-216-793-11 METAL CHIP 4.7 5% 1/10W
R210 1-216-821-11 METAL CHIP 1K 5% 1/10W
R211 1-216-845-11 METAL CHIP 100K 5% 1/10W
R212 1-216-821-11 METAL CHIP 1K 5% 1/10W
R213 1-216-829-11 METAL CHIP 4.7K 5% 1/10W
R214 1-216-864-11 SHORT 0
R301 1-216-845-11 METAL CHIP 100K 5% 1/10W
R302 1-216-845-11 METAL CHIP 100K 5% 1/10W
R303 1-216-845-11 METAL CHIP 100K 5% 1/10W
R305 1-216-853-11 METAL CHIP 470K 5% 1/10W
R310 1-216-793-11 METAL CHIP 4.7 5% 1/10W
R311 1-216-845-11 METAL CHIP 100K 5% 1/10W
R312 1-216-833-11 METAL CHIP 10K 5% 1/10W
R330 1-216-821-11 METAL CHIP 1K 5% 1/10W
R331 1-216-821-11 METAL CHIP 1K 5% 1/10W
R333 1-216-801-11 METAL CHIP 22 5% 1/10W
R336 1-216-833-11 METAL CHIP 10K 5% 1/10W
R337 1-216-833-11 METAL CHIP 10K 5% 1/10W
R338 1-216-821-11 METAL CHIP 1K 5% 1/10W
R601 1-216-837-11 METAL CHIP 22K 5% 1/10W
R602 1-216-809-11 METAL CHIP 100 5% 1/10W
R603 1-216-833-11 METAL CHIP 10K 5% 1/10W
R604 1-216-821-11 METAL CHIP 1K 5% 1/10W
R605 1-216-829-11 METAL CHIP 4.7K 5% 1/10W
R609 1-216-849-11 METAL CHIP 220K 5% 1/10W
R610 1-216-849-11 METAL CHIP 220K 5% 1/10W
R611 1-216-849-11 METAL CHIP 220K 5% 1/10W
R700 1-218-895-11 METAL CHIP 100K 0.5% 1/10W
R701 1-218-903-11 METAL CHIP 220K 0.5% 1/10W
R702 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R704 1-216-853-11 METAL CHIP 470K 5% 1/10W
R705 1-216-833-11 METAL CHIP 10K 5% 1/10W
R706 1-218-895-11 METAL CHIP 100K 0.5% 1/10W
R707 1-218-871-11 METAL CHIP 10K 0.5% 1/10W
R708 1-218-903-11 METAL CHIP 220K 0.5% 1/10W
R709 1-218-847-11 METAL CHIP 1K 0.5% 1/10W
R710 1-218-863-11 METAL CHIP 4.7K 0.5% 1/10W
R713 1-218-847-11 METAL CHIP 1K 0.5% 1/10W
R714 1-218-847-11 METAL CHIP 1K 0.5% 1/10W
R715 1-218-863-11 METAL CHIP 4.7K 0.5% 1/10W
R716 1-218-895-11 METAL CHIP 100K 0.5% 1/10W
R717 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R718 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R719 1-218-855-11 METAL CHIP 2.2K 0.5% 1/10W
R720 1-216-821-11 METAL CHIP 1K 5% 1/10W
R721 1-216-833-11 METAL CHIP 10K 5% 1/10W
R722 1-216-845-11 METAL CHIP 100K 5% 1/10W
R723 1-216-853-11 METAL CHIP 470K 5% 1/10W
R724 1-216-853-11 METAL CHIP 470K 5% 1/10W
R725 1-216-853-11 METAL CHIP 470K 5% 1/10W
R726 1-216-853-11 METAL CHIP 470K 5% 1/10W
R727 1-216-841-11 METAL CHIP 47K 5% 1/10W
R728 1-216-864-11 METAL CHIP 0 5% 1/10W
R729 1-218-831-11 METAL CHIP 220 0.5% 1/10W
R730 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R731 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R732 1-218-911-11 METAL CHIP 470K 0.5% 1/10W
R733 1-218-903-11 METAL CHIP 220K 0.5% 1/10W
R740 1-216-829-11 METAL CHIP 4.7K 5% 1/10W
R741 1-216-825-11 METAL CHIP 2.2K 5% 1/10W
R742 1-216-821-11 METAL CHIP 1K 5% 1/10W
R751 1-216-825-11 METAL CHIP 2.2K 5% 1/10W
R752 1-216-845-11 METAL CHIP 100K 5% 1/10W
R755 1-216-849-11 METAL CHIP 220K 5% 1/10W
< NETWORK RESISTOR >
RB101 1-233-416-11 RES, CHIP NETWORK 22K (3216)
RB102 1-233-578-11 RES, CHIP NETWORK 47K
RB601 1-233-577-11 RES, CHIP NETWORK 470
< VARIABLE RESISTOR >
RV301 1-225-362-11 RES, VAR, MAIN CARBON 10K/10K ( VOL)
RV601 1-223-258-11 RES, CARBON ADJ VAR 4.7K (TAPE SPEED)
< SWITCH >
S301 1-771-040-21 SWITCH, PUSH (TAPE DET)
S302 1-786-526-11 SWITCH, SLIDE (AVLS)
S303 1-786-526-11 SWITCH, SLIDE (MEGA BASS)
S601 1-771-598-11 SWITCH, SLIDE (MD CONT)
S701 1-572-922-11 SWITCH, SLIDE (HOLD) (HOLDN)
S702 1-771-851-21 SWITCH, TACTILE (SMD) (x)
S703 1-771-851-21 SWITCH, TACTILE (SMD) (bB,DIRECTION)
S704 1-771-851-21 SWITCH, TACTILE (SMD) (FF)
S705 1-771-851-21 SWITCH, TACTILE (SMD) (REW)
< THERMISTOR >
TH601 1-810-794-21 THERMISTOR, POSITIVE 3.3K
< VIBRATOR >
X701 1-579-258-11 VIBRATOR, CRYSTAL (32.768kHz)
******************************************************

17
WM-EX422
Ref. No. Part No. Description Remark
MISCELLANEOUS
*************
HP601 1-500-648-11 HEAD, MAGNETIC (PLAYBACK)
M601 1-763-798-11 MOTOR, DC (CAPSTAN/REEL)
******************************************************
ACCESSORIES
***********
3-220-749-01 CASE, CARRYING
3-253-260-41 MANUAL, INSTRUCTION
(ENGLISH, TRADITIONAL CHINESE)
8-954-008-93 RECEIVER,EAR MDR-E808LP

WM-EX422
REVISION HISTORY
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver. Date Description of Revision
1.0 2003.02 New
1.1 2003.12 Change of exploded views (Ref. No. 5). (RPC-03002)