Sony WM-EX655 User manual

Ver 1.2 2000. 03
With SUPPLEMENT 1 (9-923-312-81)
WM-EX655/EX668
AEP Model
UK Model
WM-EX668
Tourist Model
WM-EX655
CASSETTE PLAYER
SPECIFICATIONS
MICROFILM
SERVICE MANUAL
Model Name Using Similar Machanism NEW
Tape Transport Mechanism Type MT-WMEX655-125
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trademarks of
Dolby Laboratories Licensing Corporation.
Tape Player section and general
Frequency response (aNR switch off)
30 – 18,000Hz
Output
Headphones (2 REMOTE jack)
Load impedance 8 – 300ohms
Power output
4mW + 4mW at DC operation
Power requirements
1.5V DC
Rechargeable battery (NC-6WM), 1.2V, 600mAH, Ni-Cd) One R6
(size AA) battery
Battery life (Aprrox. hours)
Rechargeable NC-6WM 9
Fully charged
Sony R6P (SR) 9
Sony alkaline LR6 (WM) 36
Rechargeable NC-6WM 45
Sony alkaline LR6 (WM)
Used together
Dimensions
Approx. 108.9 x 80 x 21.3 mm (w/h/d)
Weight
Approx. 150g (Main unit)
Approx. 215g (incl. Headphones with remote control, Recharge-
able battery NC-6WM (S), Type (C-60-HF))
Supplied Accessories
• Battery charger (1)
• Rechargeable battery (NC-6WM, 1.2V 600mAh, Ni-Cd) (1)
• Battery case (1) (WM-EX655)
• Stereo earphones with remote control (1) (WM-EX655)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
• Remote control unit (RM-WME654) (1)
• Sony battery R6P (SR) (1) (WM-EX655)
• AC plug adaptor (1) (WM-EX655)
• Clip (1) (WM-EX655)
Design and specifications are subject to change without notice.
Photo :WM-EX655

– 2 –
Specifications .........................................................................1
1. GENERAL
Location and Function of Controls.........................................3
2. SERVICE NOTE ........................................................ 4
3. DISASSEMBLY
3-1. Case Assy Removal.........................................................6
3-2. Audio Board Removal.....................................................6
3-3. Cassette lid Assy Removal ..............................................7
3-4. Mechanism Deck Removal .............................................7
4. ADJUSTMENTS
4-1. Mechanical Adjustments .................................................8
4-2. Electrical Adjustments .................................................... 8
5. DIAGRAMS
5-1. Explanation of IC Terminals ...........................................9
5-2. Printed Wiring Boards...................................................12
5-3. Schematic Diagram .......................................................15
6. EXPLODEDVIEWS
6-1. Case Section ..................................................................20
6-2. Audio Board Section .....................................................21
6-3. Mechanism Deck Section (MT-WMEX655-125) .........22
7. ELECTRICAL PARTS LIST .................................. 23
TABLE OF CONTENTS
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.

– 3 –
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
Tape player section and general
rMain unit
rHeadphones with Remote Control
This section is extracted from
instruction manual.
1OPEN knob
2Contact for dry battery case
3Tape operation buttons
4Rechargeable battery case
5BL SKIP indicatior
6AVLS indicatior
7FUNCTION button
8HOLD switch
9MB/GRV (Mega Bass/Groove) indicator
0Main unit : VOLUME knob
Remote control : VOL knob
!¡ BATT indicator
!™ 2REMOTE jack
!£ a(DOLBY) NR indicator
!¢ SOUND/AVLS (Auto Volume limitter
system) switch
!∞ Micro plug
WM-EX655
!∞
33
8
!º
!¢
8
!º
Left Right Left Righ
t
WM-EX668

– 4 –
SECTION 2
SERVICE NOTE
SERVICE MODE
Mode which enables the mechanism to be operated with the AU-
DIO board opened.
This set detects the rotation of GEAR (S) using the PH701 (photo
reflector). The PH701 is mounted on theAUDIO board, and there-
fore the GEAR cannot be detected with theAUDIO board removed.
As a result, the motor cannot be controlled, causing malfunction.
Further, the S702 (FWD/REV switch) is also mounted on the AU-
DIO 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 AUDIO
board removed, follow the procedure provided below.
Note :Do not move the S702 switch position when removing the
AUDIO board.
If it is moved, the set will not be changed over to the se-
lected mode. In this case, reconnect the AUDIO board to
the set and retry the work from the beginning.
1. Setting
1) Refer to “3. DISASSEMBLY”, and remove the case and open
the AUDIO board.
2) Connect the AUDIO board to the M901 (motor) and PM901
(plunger) using a jumper wire. (See Fig- 2)
3) Short the ATS terminals (S901).
4) Press and fixed the S701 (HOLDER SW). (See Fig- 1)
[AUDIO board ] (Side B)
(Fig - 1)
5) Supply 1.5V to the battery terminals ‘and ’using a stabilized
power supply.
2. FF, REW Modes
1) Input a square wave to the TP35 (PHOTO IN). (See Fig-3)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S706 (FF) or S707 (REW).
Tape
S701
(HOLDER SW)
3. PLAY Mode
1) Input a square wave to the TP35 (PHOTO IN). (See Fig-3)
2) Press the S704 (STOP) for selecting STOP mode.
3) Press the S705 (PLAY). (Each time the switch is pressed, the
mode is chaged over.)
[AUDIO board ] (Side A)
(Fig - 2)
[AUDIO board ] (Side B)
(Fig - 3)
IC701
S704
(
p )
S705
(
9( )S706
(FF)
S707
(REW )
S708
(FUNCTION)
IC301
battery terminal
’
battery terminal ‘
connect to plunger (PM901)
ATS terminals
(S901)
connect to
motor (M901)
TP35
S702
(F/R SW)
S701
(HOLDER SW)
F side R side
Center
audio frequency
generator
square wave signal
10Hz, –3.5dB

– 5 –
LEVER (SW )
Rortation system during FF. Rortation system during REW.
Rortation system during PLAY.
side R
lever (SW)
side F
center
Gear (FR)
(FF : Left side)
Gear (Y)
Gear (NR)
Motor pully
Clutch Assy (M)
Gear (Reel)
(T side) Gear (TB)
Flywheel (N) Assy Flywheel (R) Assy Pully (Reverse
)
Gear (Reel)
(T side)
Gear (Reel)
(S side)
Gear (TA)
Gear (TB) Gear (S)
Gear (Y)
Gear (NR)
(REV : Left side/
FWD : Right side) Motor Pully
Flywheel (N) Assy
Flywheel (R) Assy Pully (Reverse)
Clutch
Assy (M)
Gear (Reel)
(S side)
Gear (FR)
(REW : Right side)
Gear (S)
Gear (Y)
Gear (NR) Motor Pully
Clutch Assy (M)
Flywheel (N) Assy
Flywheel (R) Assy Pully (Reverse)

– 6 –
1 Screw (IB lock)
1 Screws (IB lock)
2 Screws (IB lock)
3
Case assy
1 Screw
2 Screw (IB lock)
5 Remove solde
r
3 Remove solder
4 Remove solder
1 Screw
6 Head flexible board
Audio board
7
SECTION 3
DISASSEMBLY
Note:Followthedisassemblyprocedureinthenumericalordergiven.
3-1. CASE ASSY REMOVAL
3-2. AUDIO BOARD REMOVAL
r
Theequipmentcanberemo vedusingthef ollo wingpr ocedure .
Mechanism deck
Case assy Cassette lid assy
Audio board
Set

– 7 – – 8 – – 10 –– 9 –
2 Screw (IB lock)
2 Screw (IB lock)
Cassette lide assy
1 Open knob
3
Ornament, reel
Mechanism dec
k
1
3
2
4
3-3. CASSETTE LID ASSY REMOVAL
3-4. MECHANISM DECK REMOVAL
4-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Specified voltage : 1.3V.
2. Mode setting
DOLBY NR : OFF
SOUND switch : NORM
AVLS : OFF
CASSETTE SECTION
TestTape
Type Signal Used for
WS-48A 3kHz, 0dB Tape Speed Adjustment
0dB = 0.775V
Tape Speed Adjustment
Procedure :
1. Play back WS-48A (tape center part) in the FWD state and ad-
just RV601 so that the frequency counter reading becomes 3,000
± 30Hz.
2. Play back WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 1.5% of the
reading of step 1.
Adjustment Point :
[AUDIO BOARD] – Side A –
SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Before adjusting, clean the following parts with a piece of cot-
ton moistened with alcohol.
playback head pinch roller
rubber belt capstan
2. Demagnetize the playback head using a head demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound to the adjusted
parts.
5. Unless specified otherwise, use a specified voltage (1.3V) to
perform the adjustments.
Torque Measurement
Torque Torque Meter Meter Reading
FWD 16 to 30 g • cm
CQ-102C (0.23 to 0.41 oz• inch)
FWD 0.7 to 2.0 g • cm
back tension (0.01 to 0.027 oz• inch)
REV 16 to 30 g • cm
CQ-102RC (0.23 to 0.41 oz• inch)
REV 0.7 to 2.0 g • cm
back tension (0.01 to 0.027 oz• inch)
FF CQ-201B more than 40g • cm
REW (more than 0.56 oz• inch)
set
test tape
WS-48A
(3kHz, 0dB) frequency counter
+
–
J701 (headphones)
16
Ω
IC701
S704
(
p )
S705
(
9( )S706
(FF)
S707
(REW )
RV601
S708
(FUNCTION)
IC301
Pin No. Pin name I/O Description
1 M.CTL O Motor control output.
2 M.DIR O Motor rotating direction output.
3 M.BRK O Motor brake control output.
4 RESET I Reset terminal. “H” : Reset
5 TEST1 – Not used (Connect to ground).
6 TEST2 – Not used (Connect to ground).
7 TEST3 – Not used (Connect to ground).
8 L.DOLBY O Dolby LED control output.
9 L.AVLS O AVLS LED control output.
10 L.BATT O BATT LED control output.
11 L.BLSKIP O BL SKIP LED control output.
12 MUTE CTL O Audio mute control output.
13 PM CTL O Plunger control output.
14 PHOTO CTL O Rotation detect control output.
15 XTB O Crystal oscillator connect terminal (32.768kHz).
16 XT I Crystal oscillator connect terminal (32.768kHz).
17 VDD – Power supply (+1.5V).
18 VSS1 – Power supply (Ground).
19 VCM – Internal power supply STEP-UP terminal.
20 VCP – Internal power supply STEP-UP terminal.
21 VSS2 – Internal power supply STEP-UP terminal.
22 VEE – Internal power supply STEP-UP terminal.
23 SET STOP1 I Power failure detect input.
24 SET STOP2 I Power failure detect input.
25 KEY IN I Key input.
26 HOLDER SW I Holder switch input. “H” : Close
27 BEEP O Beep signal output.
28 AMS IN I Recording sound detection input.
29 RMUM I Remote control data request.
30 DATA I Remote control data input.
31 DOLBY CTL O Dolby control signal output.
32 DDC CTL O DC-DC converter control output.
33 F/R CTL O FWD/REV select signal output. “H” : FWD
34 L.MB O MEGA BASS LED control output.
35 L.GRV O GROOVE LED control output.
36 FWD SW I F/R switch input.
37 REV SW I F/R switch input.
38 PHOTO IN I Rotation detect input.
39 VDD – Power supply (+1.5V).
40 BOOST CTL O MEGA BASS ON/OFF control output.
SECTION 5
DIAGRAMS
5-1. EXPLANATION OF ICTERMINALS
IC701 MSM6576-90GS-K (SYSTEM CONTROL)
Pin No. Pin name I/O Description
41 MB/GRV CTL O MEGA BASS /GROOVE select control output.
42 LOAD CTL O Battery check load control output.
43 AVLS CTL O AVLS ON/OFF control output.
44 AMP CTL O Amplifier ON/OFF control output.

– 15 – – 16 – – 18 –– 17 –
WM-EX655/EX668
Note:
• 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.
•U: B+ Line.
•H: adjustment for repair.
• Powervoltage isdc 1.5V andfedwith regulateddc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : PLAY
• Voltagesare taken withaVOM (Inputimpedance 10MΩ).
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: PB
1
250mVp-p
32.768kHz
IC701 !∞ XTB
VOLT/DIV : 50mVAC
TIME/DIV : 10µsec
rWAVEFORM
5-3. SCHEMATIC DIAGRAM rRefer to page 19 for IC Block Diagrams.

– 21 – – 22 –– 19 – – 20 –
rIC BLOCK DIAGRAMS
IC601 MM1279XVBE
IC301 TA2103F
+
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
+
+
+
+
16
15
14
13
12
11
10
9
8
7
6
5
432
1
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
3435
36373839404142
43
44
45
46
47
48
RIPPLE
FILTER
AGC
DET BST
SW
BEEP
V-I PW
V REF
BASS
SW
AGC DET
PRE
V REF
CH-A CH-B
PRE NF-L
PRE OUT-L
MTL DRV-L
MTL DRV-R
PRE OUT-R
PRE NF-R
F/R SW
DET 1
AMS OUT
AMS HPF
PRE SW
EK IN-R
BUF IN-R
NR SW
BUF IN-L
EK IN-L
DET 2
HIGH SW
BST SW
PW IN-C
BST OUT
BST NF
EQ-R
PW NF-R VCC1 PRE GND 3 IN-R REV IN-R FWD DC SRV-R PRE VREF
DC SRV-L IN-R FWD
IN-L REV
EQ-L
PW NF-L
PW IN-L
PRE GND
PW IN-R
PW VREF
RF IN
NR OUT-R
SC IN-R
HPF-R
RECT-R
PRE GND 2
RECT-L
HPF-L
SC IN-L
NR OUT-L
AGC IN
RF OUT
BASE
VCC
PW GND
PW OUT-R
PW OUT-C
PW OUT-L
PW SW
MUTE SW
BEEP
TC
AVLS DET
AVLS IN
AVLS OUT
PRE MTL
DRV
PW C
ALC PW B PW A
EK
D
F
C
G
CH-A NR
CH-B NR
B
SW
MIX
AMS
ADD B
ADD A
SECTION 6
EXPLODED VIEWS
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. CASE SECTION
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
1 3-375-114-61 SCREW
2 X-3374-606-1 CASSET LID ASSY (BLACK) (EX655)
2 X-3374-607-1 CASSET LID ASSY (SILVER) (EX655)
2 X-3374-608-1 CASSET LID ASSY (BLUE) (EX655)
2 X-3374-609-1 CASSET LID ASSY (ORANGE) (EX655)
2 X-3375-608-1 CASSET LID ASSY (BLACK) (EX668)
2 X-3375-609-1 CASSET LID ASSY (SILVER (EX668)
2 X-3375-610-1 CASSET LID ASSY (BLUE) (EX668)
2 X-3375-611-1 CASSET LID ASSY (ORANGE) (EX668)
3 3-704-197-91 SCREW (IB LOCK)•••(SILVER,BLUE,ORANGE)
3 3-939-590-13 SCREW (IB LOCK)•••(BLACK)
4 3-015-913-01 KNOB (OPEN)
5 3-015-912-11 ORNAMENT, REEL
6 3-020-859-01 SPACER (RI)
7 3-939-590-18 SCREW (IB LOCK)•••(SILVER,BLUE,ORANGE)
7 3-939-590-19 SCREW (IB LOCK)•••(BLACK)
8 X-3374-610-1 CASE ASSY (BLACK)
8 X-3374-611-1 CASE ASSY (SILVER)
8 X-3374-612-1 CASE ASSY (BLUE)
8 X-3374-613-1 CASE ASSY (ORANGE)
9 3-015-922-01 KNOB (HOLD)(BLACK)
9 3-015-922-11 KNOB (HOLD) (SILVER)
9 3-015-922-21 KNOB (HOLD) (BLUE)
9 3-015-922-31 KNOB (HOLD) (ORANGE)
10 3-389-523-35 SCREW (IB LOCK)•••(SILVER,BLUE,ORANGE)
10 3-389-523-36 SCREW (IB LOCK)•••(BLACK)
11 3-015-924-01 PLATE, ORNAMENTAL
12 3-021-423-01 CUSHION (PI) (WM-EX655)
51 3-704-197-01 SCREW (IB LOCK)
52 X-3374-062-1 BRACKET ASSY
53 3-016-085-01 BRACKET (C)
54 3-009-662-32 COVER (A), MD (WM-EX668)
54 3-009-662-21 COVER (A), MD (WM-EX655)
55 X-3374-063-1 HOLDER ASSY, CASSETTE
56 3-366-890-01 SCREW (M1.4)
57 3-928-465-01 DETENT, CASSETTE
58 3-007-282-01 TERMINAL BOARD (MINUS),BATTERY
59 3-015-926-01 LID, BATTERY CASE (BLACK)
59 3-015-926-11 LID, BATTERY CASE (SILVER)
59 3-015-926-21 LID, BATTERY CASE (BLUE)
59 3-015-926-31 LID, BATTERY CASE (ORANGE)
60 3-375-114-71 SCREW
61 X-3374-330-1 TERMINAL BOARD ASSY (K)
62 A-3061-556-A AUDIO BOARD, COMPLETE (EX655)
62 A-3061-693-A AUDIO BOARD, COMPLETE (EX668 : FR)
62 A-3021-130-A AUDIO BOARD, COMPLETE
(EX668 : EXCEPT FR)
63 3-019-232-01 SPRING, TENSION
64 3-015-925-01 TERMINAL BOARD
65 3-016-087-02 COVER (SW)
66 3-018-159-01 SPRING, TORSION
S901 1-762-582-11 SWITCH, LEAF (ATS)
101 3-011-277-01 COVER (B) (Y), MD
6-2. AUDIO BOARD SECTION
• Accessories and packing materials are given
in the last of this parts list.
1
3
3
4
5
6
7
7
9
10
11
8
2
not supplied
12
S901
51
51
51
51
51
52
53
54
55
56
57
58
59
60
60
61
62
64
65
66
63
• Abbreviation
FR : French
102 3-704-413-31 SCREW (M1.4X7.2)
103 X-3372-850-1 PINCH LEVER (N) ASSY
104 3-007-434-01 PULLEY (REVERSE)
105 3-007-428-01 WASHER (R)
106 X-3372-851-1 FLYWHEEL (R) ASSY
107 3-007-439-01 SLIDER (LOCK)
108 3-386-694-11 WASHER
109 X-3372-852-1 FLYWHEEL (N) ASSY
110 3-007-430-01 BELT
111 3-007-960-01 SPRING (EJECT) (Y), TORSION
113 3-010-274-02 TABLE, REEL
114 3-007-436-01 SPRING (TRIGGER), TORSION
115 X-3372-848-1 CLUTCH ASSY (M)
116 3-007-435-01 GEAR (FR)
117 X-3372-853-1 LEVER (FRG) ASSY
119 3-007-432-01 SHEET (R), REFLECTION
120 3-007-427-01 SCREW (IB LOCK)
121 X-3374-094-1 CHASSIS (S) ASSY (Y)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
122 3-007-455-01 SPRING (R), TORSION
123 3-007-458-01 SPRING (H/B), TENSION
124 3-007-456-01 SPRING (N), TORSION
125 3-007-454-01 SPRING (FR), TORSION
126 3-007-457-01 SPRING (TEN), TENSION
127 X-3372-849-1 PINCH LEVER (R) ASSY
128 3-010-954-01 SPRING (BT), COMPRESSION
129 3-918-943-01 WASHER, STOPPER
130 3-366-017-01 BUSHING (CAPSTAN)
131 3-007-429-01 WASHER (R), STOPPER
132 3-932-724-21 WASHER
*133 3-010-272-01 BELT, RETAINER
134 3-569-706-01 SPACER, CASSETTE LID
HP901 1-500-280-11 HEAD, MAGNETIC (PLAYBACK)
M901 1-698-885-11 MOTOR
PM901 1-454-674-31 SOLENOID, PLUNGER
6-3. MECHANISM DECK SECTION
(MT-WMEX655-125)
HP901
PM901
M901
101
102
103
104
105
106
107
108
109 110
111
113
114
115
116
117
119
120
121
122
123
124 125
126
127
128
129
130
131
130
132
133
134
Ver 1.1 1998.10

– 23 –
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 : m , for example :
uA.... : m A.... , uPA.... : m PA....
uPB.... : m PB.... , uPC.... : m PC....
uPD.... : m PD....
• CAPACITORS
uF : m F
• COILS
uH : m H
SECTION 7
ELECTRICAL PARTS LIST
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
A-3061-556-A AUDIO BOARD, COMPLETE (EX655)
A-3061-693-A AUDIO BOARD, COMPLETE (EX668 : FR)
A-3021-130-A AUDIO BOARD, COMPLETE
(EX668 : EXCEPT FR)
**********************
< CAPACITOR >
C101 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C104 1-115-156-11 CERAMIC CHIP 1uF 10V
C105 1-162-965-11 CERAMIC CHIP 0.0015uF 10% 50V
C106 1-164-174-11 CERAMIC CHIP 0.0082uF 10% 25V
C107 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C108 1-115-156-11 CERAMIC CHIP 1uF 10V
C109 1-107-823-11 CERAMIC CHIP 0.47uF 10% 16V
C110 1-135-180-21 TANTALUM CHIP 3.3uF 20% 6.3V
C111 1-115-156-11 CERAMIC CHIP 1uF 10V
C113 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C201 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C204 1-115-156-11 CERAMIC CHIP 1uF 10V
C205 1-162-965-11 CERAMIC CHIP 0.0015uF 10% 50V
C206 1-164-174-11 CERAMIC CHIP 0.0082uF 10% 25V
C207 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C208 1-115-156-11 CERAMIC CHIP 1uF 10V
C209 1-107-823-11 CERAMIC CHIP 0.47uF 10% 16V
C210 1-135-180-21 TANTALUM CHIP 3.3uF 20% 6.3V
C211 1-115-156-11 CERAMIC CHIP 1uF 10V
C213 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C301 1-128-015-11 SOLID CHIP 22uF 20% 4V
C302 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C303 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C304 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C305 1-135-316-11 TANTAL. CHIP 22uF 20% 2.5V
C306 1-162-974-11 CERAMIC CHIP 0.01uF 50V
C307 1-135-149-21 TANTALUM CHIP 2.2uF 20% 10V
C308 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C310 1-117-578-11 TANTAL. CHIP 470uF 20% 2.5V
C311 1-115-156-11 CERAMIC CHIP 1uF 10V
C312 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C313 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C314 1-135-201-11 TANTALUM CHIP 10uF 20% 4V
C315 1-115-156-11 CERAMIC CHIP 1uF 10V
C316 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C317 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C318 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C319 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
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 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C603 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C604 1-107-826-11 CERAMIC CHIP 0.1uF 10% 16V
C605 1-115-467-11 CERAMIC CHIP 0.22uF 10% 10V
C606 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C607 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C608 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C701 1-135-151-21 TANTALUM CHIP 4.7uF 20% 4V
C702 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C703 1-162-915-11 CERAMIC CHIP 10PF 0.5PF 50V
C704 1-115-156-11 CERAMIC CHIP 1uF 10V
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
C721 1-164-156-11 CERAMIC CHIP 0.1uF 25V
CB301 1-117-968-11 CERAMIC CHIP (ARRAY) 680P
CB302 1-125-786-11 CERAMIC CHIP (ARRAY)
CB303 1-125-785-11 CERAMIC CHIP (ARRAY)
< CONNECTOR >
CN301 1-766-336-21 CONNECTOR, FFC/FPC 6P
< DIODE >
D101 8-719-423-35 DIODE MA8120-H
D201 8-719-423-35 DIODE MA8120-H
D501 8-719-049-09 DIODE 1SS367-T3SONY
D701 8-719-404-49 DIODE MA111
D702 8-719-423-35 DIODE MA8120-H
D703 8-719-423-35 DIODE MA8120-H
D704 8-719-049-09 DIODE 1SS367-T3SONY
D705 8-719-423-35 DIODE MA8120-H (EX668)
D751 8-719-051-01 LED CL-170HR-CD-T (BATT)
D752 8-719-051-01 LED CL-170HR-CD-T (MB)
D753 8-719-051-01 LED CL-170HR-CD-T (GRV)
D754 8-719-051-01 LED CL-170HR-CD-T (aNR)
D755 8-719-051-01 LED CL-170HR-CD-T (AVLS)
AUDIO
• Abbreviation
FR : French
JEW : Tourist
When indicating parts by reference num-
ber, please include the board.
The components identified by mark !
or dotted line with mark !are critical
for safety.
Replaceonly with part number specified.
Ver 1.1 1998.10

– 24 –
D756 8-719-051-01 LED CL-170HR-CD-T (BL SKIP)
< IC >
IC301 8-759-440-52 IC TA2103F
IC601 8-759-356-46 IC MM1279XVBE
IC701 8-759-479-05 IC MSM6576-90GS-K
IC702 8-759-280-85 IC PST9010NL
IC703 8-759-430-08 IC PST9008NL
IC704 8-759-469-63 IC S-81215SGUP-DQK-T1
< JACK >
J701 1-779-867-41 JACK (2REMOTE)
< PHOTO INTERRUPTER >
PH701 8-719-988-15 PHTO REFLECTOR PR-11-C
< TRANSISTOR >
Q301 8-729-230-72 TRANSISTOR 2SA1362YG
Q302 8-729-420-50 TRANSISTOR UN5215
Q303 8-729-420-50 TRANSISTOR UN5215
Q304 8-729-422-39 TRANSISTOR XN4404
Q305 8-729-420-50 TRANSISTOR UN5215
Q501 8-729-420-24 TRANSISTOR 2SB1218A-QRS
Q502 8-729-115-28 TRANSISTOR BN1L3Z-K
Q503 8-729-403-17 TRANSISTOR XN1215
Q504 8-729-030-54 TRANSISTOR MSB1218A-RT1
Q601 8-729-402-84 TRANSISTOR XN4601
Q701 8-729-422-51 TRANSISTOR UN5110-QRS
Q702 8-729-421-29 TRANSISTOR UN5216R
Q703 8-729-230-72 TRANSISTOR 2SA1362YG
Q704 8-729-030-54 TRANSISTOR MSB1218A-RT1
Q705 8-729-421-29 TRANSISTOR UN5216R
Q706 8-729-230-72 TRANSISTOR 2SA1362YG
Q721 8-729-422-18 TRANSISTOR XN4315
Q722 8-729-030-53 TRANSISTOR MSD1819A-RT1
Q751 8-729-421-77 TRANSISTOR UN5210-R-TX
Q752 8-729-022-66 TRANSISTOR XN1210-TX
Q753 8-729-022-66 TRANSISTOR XN1210-TX
< RESISTOR >
R101 1-216-812-11 METAL CHIP 180 5% 1/16W
R103 1-216-847-11 METAL CHIP 150K 5% 1/16W
R104 1-216-824-11 METAL CHIP 1.8K 5% 1/16W
R109 1-216-821-11 METAL CHIP 1K 5% 1/16W
R110 1-216-809-11 METAL CHIP 100 5% 1/16W
R111 1-216-844-11 METAL CHIP 82K 5% 1/16W
R112 1-216-793-11 METAL GLAZE 4.7 5% 1/16W
R113 1-216-805-11 METAL CHIP 47 5% 1/16W
(FR)
R113 1-216-864-11 METAL CHIP 0 (EXCEPT FR)
R201 1-216-812-11 METAL CHIP 180 5% 1/16W
R203 1-216-847-11 METAL CHIP 150K 5% 1/16W
R204 1-216-824-11 METAL CHIP 1.8K 5% 1/16W
R209 1-216-821-11 METAL CHIP 1K 5% 1/16W
R210 1-216-809-11 METAL CHIP 100 5% 1/16W
R211 1-216-844-11 METAL CHIP 82K 5% 1/16W
R212 1-216-793-11 METAL GLAZE 4.7 5% 1/16W
R213 1-216-805-11 METAL CHIP 47 5% 1/16W
(FR)
R213 1-216-864-11 METAL CHIP 0 (EXCEPT FR)
R301 1-218-891-11 METAL GLAZE 68K 0.50% 1/16W
R302 1-216-837-11 METAL CHIP 22K 5% 1/16W
R303 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R304 1-218-295-11 METAL GLAZE 43K 5% 1/16W
R305 1-216-841-11 METAL CHIP 47K 5% 1/16W
R306 1-216-793-11 METAL GLAZE 4.7 5% 1/16W
R307 1-216-849-11 METAL CHIP 220K 5% 1/16W
R308 1-216-837-11 METAL CHIP 22K 5% 1/16W
R309 1-216-821-11 METAL CHIP 1K 5% 1/16W
R502 1-216-833-11 METAL CHIP 10K 5% 1/16W
R601 1-216-849-11 METAL CHIP 220K 5% 1/16W
R602 1-216-817-11 METAL CHIP 470 5% 1/16W
R603 1-216-830-11 METAL CHIP 5.6K 5% 1/16W
R604 1-216-837-11 METAL CHIP 22K 5% 1/16W
R605 1-216-809-11 METAL CHIP 100 5% 1/16W
R606 1-216-849-11 METAL CHIP 220K 5% 1/16W
R607 1-216-849-11 METAL CHIP 220K 5% 1/16W
R608 1-216-829-11 METAL CHIP 4.7K 5% 1/16W
R609 1-216-809-11 METAL CHIP 100 5% 1/16W
R701 1-216-813-11 METAL CHIP 220 5% 1/16W
R702 1-216-857-11 METAL CHIP 1M 5% 1/16W
R703 1-216-849-11 METAL CHIP 220K 5% 1/16W
R706 1-216-845-11 METAL CHIP 100K 5% 1/16W
R708 1-216-821-11 METAL CHIP 1K 5% 1/16W
R709 1-216-001-00 METAL CHIP 10 5% 1/10W
R710 1-216-001-00 METAL CHIP 10 5% 1/10W
R711 1-216-001-00 METAL CHIP 10 5% 1/10W
R712 1-216-821-11 METAL CHIP 1K 5% 1/16W
R721 1-216-815-11 METAL CHIP 330 5% 1/16W
R722 1-216-847-11 METAL CHIP 150K 5% 1/16W
R723 1-216-849-11 METAL CHIP 220K 5% 1/16W
R731 1-218-870-11 METAL GLAZE 9.1K 0.50% 1/16W
R732 1-218-836-11 METAL GLAZE 360 0.50% 1/16W
R751 1-216-829-11 METAL CHIP 4.7K 5% 1/16W
R752 1-216-837-11 METAL CHIP 22K 5% 1/16W
< COMPOSITION CIRCUIT BLOCK >
RB301 1-233-872-21 RES, NETWORK (CHIP TYPE) 33K
RB302 1-234-085-11 RES, NETWORK
RB303 1-234-086-11 RES, NETWORK
RB701 1-233-873-21 RES, NETWORK
RB731 1-233-941-21 RES, NETWORK
RB751 1-233-414-11 RES, CHIP NETWORK 4.7K
< VARIABLE RESISTOR >
RV301 1-225-502-11 RES, VAR, CARBON 10K/10K (VOLUME)
RV601 1-223-576-11 RES, ADJ, METAL GLAZE 2.2K (TAPE SPEED)
< SWITCH >
S701 1-762-498-21 SWITCH, PUSH (1 KEY) (HOLDER)
S702 1-572-581-11 SWITCH, SLIDE (FWD/STOP/REV)
S703 1-762-078-11 SWITCH, SLIDE ($HOLD)
S704 1-771-053-21 SWITCH, KEY BOARD (p)
S705 1-771-053-21 SWITCH, KEY BOARD (œREPEAT)
S706 1-771-053-21 SWITCH, KEY BOARD (FF AMS)
AUDIO
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

– 25 –
S707 1-771-053-21 SWITCH, KEY BOARD (REW AMS)
S708 1-771-053-21 SWITCH, KEY BOARD (FUNCTION)
< THERMISTOR >
THP601 1-810-794-11 THERMISTOR, POSITIVE
< VIBRATOR >
X701 1-579-616-11 VIBRATOR, CRYSTAL (32.768kHz)
************************************************************
MISCELLANEOUS
**************
HP901 1-500-280-11 HEAD, MAGNETIC (PLAYBACK)
M901 1-698-885-11 MOTOR
PM901 1-454-674-31 SOLENOID, PLUNGER
S901 1-762-582-11 SWITCH, LEAF (ATS)
************************************************************
ACCESSORIES & PACKING MATERIALS
********************************
1-475-181-11 REMOTE CONTROL UNIT(RM-WME654)
!1-528-252-21 BATTERY CHARGER (BC-7S) (UK)
1-528-543-22 BATTERY, NI-CD (NC-6WM)
!1-528-580-21 BATTERY CHARGER (BC-7HT) (JEW)
!1-528-744-11 BATTERY CHARGER (BC-7DY) (AEP, FR)
!1-569-007-11 ADAPTOR,CONVERSION 2P (JEW)
1-759-213-21 CASE, BATTERY (WM-EX655)
3-008-521-01 CASE, BATTERY CHARGE
3-021-018-01 LABEL, FRANCE (French)
3-021-018-11 LABEL, FRANCE (French)
3-861-030-01 MANUAL, INSTRUCTION (JAPANESE,
ENGLISH, KOREAN) (JEW)
3-861-030-11 MANUAL, INSTRUCTION (ENGLISH, FRENCH,
RUSSIAN) (AEP, UK, FR)
3-861-030-21 MANUAL, INSTRUCTION (SPANISH, GERMAN,
ITALIAN) (AEP)
3-861-030-31 MANUAL, INSTRUCTION (DUTCH, SWEDISH,
PORTUGUESE) (AEP)
3-918-892-01 CASE, CARRYING
3-920-201-01 CLIP (JEW)
8-953-219-90 HEADPHONE MDR-ED132MP//K SET
(WM-EX655)
1-505-441-11 HEADPHONE MDR-WME633 (WM-EX668)
Ref. No. Part No. Description Remark
AUDIO
The components identified by mark !or dotted
line with mark !are critical for safety.
Replace only with part number specified.
Ver 1.2 2000.03

– 26 –
WM-EX655/EX668
9-923-312-11 Sony Corporation
Personal A&V Products Company
98C027551-1
Printed in Hangary © 1998.3
Published by Quality Engineering Dept.
(Shibaura)

1998. 10
WM-EX655/EX668
SERVICE MANUAL
SUPPLEMENT - 1
File this Supplement with the Service Manual.
Subject :
rNO INTERCHANGEABILITY OF MOTORS DUE TO
CHANGE OF MECHANISM DECK
rCAUTION WHEN INSTALLING A NEW MOTOR
rCHANGED PARTS LIST
(SPM-98008)
AEP Model
UK Model
WM-EX668
Tourist Model
WM-EX655

– 2 –
HP901
PM901
M901
M901
101
102
103
104
105
106
107
108
109 110
111
113
114
115
116
117
119
120
FORMER TYPE NEW TYPE
120
134
121 121
122
123
124 125
126
127
128
129
130
131
130
132
133
134
! : Changed portion
Caution : Since the new motor (M901) and chassis (S) ASSY are not compatible with the former ones, when replacing either of these
parts, replace them with the same version.
Ref. No Part No. Description Remark Part No. Description Remark
FormerType NewType
108 3-386-694-11 WASHER
109 X-3372-852-1 FLYWHEEL (N) ASSY
116 3-007-435-01 GEAR (FR)
120 3-007-427-01 SCREW (IB LOCK)
121 X-3374-094-1 CHASSIS (S) ASSY (Y)
122 3-007-455-01 SPRING (R), TORSION
124 3-007-456-01 SPRING (N), TORSION
134 –––––––––––
HP901 1-500-280-11 HEAD, MAGNETIC (PLAYBACK)
M901 1-698-885-11 MOTOR
PM901 1-454-674-31 SOLENOID, PLUNGER
3-386-694-21 WASHER
X-3372-852-4 FLYWHEEL (N) ASSY
3-016-696-01 GEAR (FRN)
3-335-797-01 SCREW (M1.4 x 2), TOOTHED LOCK
X-3374-420-1 CHASSIS (S) ASSY (M)
3-019-710-01 SPRING (R), TORSION
3-019-709-01 SPRING (N), TORSION
3-335-797-21 SCREW (M1.4 x 3), TOOTHED LOCK
1-500-537-11 HEAD, MAGNETIC (PLAYBACK)
X-3376-217-1 MOTOR ASSY
1-454-674-32 SOLENOID, PLUNGER
%
%
#
@
^
^
^
^
@
$
$
^
#
rNO INTERCHANGEABILITY OF MOTORS DUETO CHANGE OF MECHANISM DECK
MECHANISM DECK SECTION (Service Manual See page 22)
(MT-WMEX655-125)
#

– 3 –
rCHANGED PARTS LIST
Ref. No. Part No. Description Remark Part No. Description Remark
Page Before Change After Change
EXPLODED VIEWS
rCAUTION WHEN INSTALLING A NEW MOTOR
Always give a drop of Diamond Oil NT68 (7-661-018-18) to the hole of the shaft marked with ! when installing a new motor
(X-3376-217-1).
!
3 3-939-590-13 SCREW (IB LOCK) • • • (BLACK)
7 3-939-590-18 SCREW (IB LOCK) • • • (SILVER,BLUE,ORANGE)
20 7 3-939-590-19 SCREW (IB LOCK) • • • (BLACK)
10 3-389-523-35 SCREW (IB LOCK) • • • (SILVER,BLUE,ORANGE)
10 3-389-523-36 SCREW (IB LOCK) • • • (BLACK)
3-704-197-93 SCREW (M1.4 x 1.8) • • • (BLACK)
3-704-197-41 SCREW (M1.4 x 2.2) • • • (SILVER,BLUE,
ORANGE)
3-704-197-42 SCREW (M1.4 x 2.2), LOCKING • • • (BLACK)
3-704-197-61 SCREW (M1.4 x 4.0) • • • (SILVER,BLUE,
ORANGE)
3-704-197-63 SCREW (M1.4 x 4.0) • • • (BLACK)

– 4 –
54 3-009-662-21 COVER (A), MD (WM-EX655)
67 ————————————
68 ————————————
21
1-759-213-21 CASE, BATTERY (WM-EX655)
25 8-953-219-90 HEADPHONE MDR-ED132MP//K SET(WM-EX655)
1-505-441-11 HEADPHONE MDR-WME633 (WM-EX668)
21, 23
62 A-3061-792-A AUDIO BOARD, COMPLETE (EX668:EXCEPT FR)
**********************
Ref. No. Part No. Description Remark Part No. Description Remark
Page INCORRECT CORRECT
A-3021-130-A AUDIO BOARD, COMPLETE
(EX668:EXCEPT FR)
**********************
rCORRECTION
EXPLODEDVIEWS
9-923-312-81 Sony Corporation
Personal A&V Products Company
98J0251-1
Printed in Japan © 1998.10
Published by Quality Engineering Dept.
(Shibaura)
WM-EX655/EX668
3-009-662-22 COVER (A), MD (WM-EX655)
3-024-440-01 SHEET (LIGHT INTERCEPTION)
3-309-729-00 SHEET, LEAF SW • • • (BLUE, ORANGE)
1-759-213-21 CASE, BATTERY
8-953-219-90 HEADPHONE MDR-ED132MP//K SET
——————————————
! : Changed or added portion
S901
51
51
51
51
51
52
53
54
55
56
57
58
59
60
60
61
62
68
67
64
65
66
63
Ref. No. Part No. Description Remark Part No. Description Remark
Page Before Change After Change
%
#
%