Sony Walkman WM-EX651 User manual

WM-EX651
E Model
Chinese Model
SERVICE MANUAL
CASSETTE PLAYER
SPECIFICATIONS
Model Name Using Similar Mechanism WM-EX631
Tape Transport Mechanism Type MT-WMEX610-162
Ver 1.0 2004.09
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-879-142-01
2004I02-1
© 2004.09
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (ijack)
Load impedance 8 - 300 Ω
Power requirements
• One rechargeable battery: 1.2V DC x 1
• One R6 (size AA) battery: 1.5 V DC x 1
For charging stand (DC IN 3 V jack)
• AC power adaptor
Dimensions (w/h/d)
Approx. 76.4 x 108.9 x 21.8 mm(excl. projecting parts and
controls)
Mass
Approx. 140 g (main unit only)
Supplied accessories
• Battery case (1)
• AC power adaptor (1)
• Charging stand (1)
• Stereo headphones or earphones with remote control (1)
• Rechargeable battery (NH-10WM, 1.2 V, 900 mAh (MIN), Ni- MH) (1)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
• AC plug adaptor (1) (“Sony world model” only)
Design and specifications are subject to change without notice.

WM-EX651
2
TABLE OF CONTENTS
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of 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.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40°C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to
be applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set
to about 350°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder
may also be added to ordinary solder.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON 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
PUBLISHED BY SONY.
N
otes on the AC power adaptor
•Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
•Connect the AC power adaptor to an easily accessible
AC outlet. Should you notice an abnormality in the AC
power adaptor, disconnect it from the AC outlet
immediately.
•Do not touch the AC power adaptor with wet hands.
Polarity of
the plug
1. SERVICE NOTE ................................................................ 3
2. GENERAL ........................................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ························································ 6
3-2. Case Assy ····································································· 6
3-3. Main Board ·································································· 7
3-4. Belt (F4) ······································································· 7
3-5. Motor (Capstan/Reel) (M901) ····································· 8
3-6. Cassette Lid Assy ························································· 8
3-7. Ornament (Open) Assy ················································· 9
3-8. Holder (FS) Assy ·························································· 9
3-9. Pinch Lever (N)/(R) Assy ·········································· 10
3-10. Magnetic Head (HP901) ············································ 10
4. MECHANICAL ADJUSTMENT ................................. 11
5. ELECTRICAL ADJUSTMENT................................... 11
6. DIAGRAMS
6-1. IC Block Diagrams ····················································· 12
6-2. Block Diagrams ·························································· 13
6-3. Schematic Diagram – Main Section (1/2)– ················ 14
6-4. Schematic Diagram – Main Section (2/2)– ················ 15
6-5. Printed Wiring Boards – Main Section (Side A)– ······ 16
6-6. Printed Wiring Boards – Main Section (Side B)– ······ 17
6-7. IC Pin Function Descriptions ····································· 18
7. EXPLODED VIEWS
7-1. Case Section ······························································· 19
7-2. Main Board Section ··················································· 20
7-3. Mechanism Deck Section-1 ······································· 21
7-4. Mechanism Deck Section-2 ······································· 22
8. ELECTRICAL PARTS LIST........................................ 23

WM-EX651
3
SECTION 1
SERVICE NOTE
[Service Mode]
The service mode enables to operate the mechanism of WM-EX651
while the MAIN board is opened.
Rotation of the idler gear (A) (S side) is detected using the photo-
reflector (PH701) in the WM-EX651. PH701 is located on the
MAIN board, therefore the rotation of the idler gear (A) (S side)
cannot be detected by PH701 when the MAIN board is removed.
As a result, the motor cannot be controlled and cannot run correctly.
To repair the machine after the MAIN board is removed while the
main power is turned on, follow the procedures as described below.
1. Setting
1) Remove the cabinets referring to section “3. DISASSEMBLY”.
Open the MAIN board.
2) Connect the motor (M901) and the plunger solenoid (PM901)
to the MAIN board using the jumper wires. When the
extension jig (1-769-143-11) (10 wires as a set) is used, they
can be connected easily.
3) Short the TAPE DETECT switch (S901-1) and the ATS switch
(S901-2).
4) Connect an AF oscillator to TP53 (P. IN) and TP14 (GND).
5) Connect DC 1.3 V from external regulated power supply to
3and #terminals of the battery.
2. PRE-SET status
The PLAY, FF and REW modes can be entered only from the PRE-
SET status.
1) Check that the slider (NR) is in the center position (S701)(See
page 4 for illustration), and the FWD/REV switch (S701) is
also in the center position. When these switches are not in the
center position, set them to the PRE-SET status as follows.
2) Move the FWD/REV switch (S701) to the same position as
the slider (NR) is set.
3) The slider (NR) can be moved when the main power of the
regulated power supply is turned OFF once then back ON.
Move the FWD/REV switch (S701) to the center position in
synchronism with the timing when the slider (NR) is moved.
3. FF, REW modes
1) Check that the PRE-SET status is set.
2) Connect square wave or sine wave to TP53 (P. IN) and TP14
(GND). (See illustration below)
3) Press the xswitch (S703) to enter the STOP mode.
4) Press the FF/CUE switch (S705) or REW/REVIEW switch
(S706).
4. PLAY mode
1) Check that the PRE-SET status is set.
2) Connect square wave or sine wave to TP53 (P. IN) and TP14
(GND). (See illustration below)
3) Press the xswitch (S703) to enter the stop mode.
4) When the nN switch (S704) of the MAIN board is pressed,
the slider (N/R) moves once to the F side then moves to the R
side. When the FWD/REV switch (S701) is pressed in the
synchronism with the above timing, the machine can enter
the PLAY (R side) mode. Press the nN switch (S704)
again, and move the FWD/REV switch (S701) in the
synchronism with the motion of slider (NR). It enables the
machine to enter into the PLAY (F side) mode. (See page 4
for illustration)
Note 1: When you fail to enter the PLAY mode, re-start from step 2)
PRE-SET status.
Note 2: Regarding the nN (S704), x(S703), FF/CUE (S705) and
REW/REVIEW (S706) switches, use these switches of the
remote control unit as much as possible.
Note 3: If a headphones are used, the beep sound shows the timing of the
FWD/REV switch (S701).
– MAIN BOARD (SIDE B) —
TAPE DETECT
SWITCH
(S901-1)
ATS
SWITCH
(S901-2)
Plunger (PM901)
Short
AF OSC
Battery
terminal
#
Battery terminal
3
TP14
(GND)
S701
FWD
←
STOP
→
REV
x
TP53
(P.IN)
PH701
M901
Square-wave
(sine wave)
10 Hz, -3.5 dB
M

WM-EX651
4
[ Slider (NR) ] [ Tape drive mechanism ]
Tape drive mechanism in PLAY mode
Tape drive mechanism in FF mode Tape drive mechanism in REW mode
Insert Flywheel (N) Insert Flywheel (R)
Pulley (Reverse
)
Clutch Assy (F)
Gear (Y)
Cam Gear
Gear (REEL) (S side)
Motor Pulley
Idler Gear (A) (S side)
Gear (FR)
(REW:Right side)
Insert Flywheel (N) Insert Flywheel (R)
Pulley (Reverse)
Clutch Assy (F)
Gear (Y)
Cam Gear
Gear (REEL) (T side) Motor Pulley
Idler Gear
(A) (T side)
Gear (FR)
(FF:Left side)
Insert Flywheel (N) Insert Flywheel (R)
Pulley (Reverse
)
Clutch Assy (F)
Idler Gear (B)
Gear (Y)
Cam Gear
Gear
(REEL) (T side) Gear (REEL) (S side)
Motor Pulley
Idler Gear
(A) (T side) Idler Gear (A) (S side)
Gear (NR)
(FWD:Left side
REV:Right side)
Slider (NR)
F side R side
Center

WM-EX651
5
SECTION 2
GENERAL This section is extracted
from instruction manual.
*There is a tactile dot beside VOL on the main unit to show the direction to turn up
the volume.
** The button has a tactile dot.
SPEED CONTROL
OPEN
x STOP
bB PLAY/REPEAT**
REW/REVIEW•FF/CUE
VOL*
HOLD
Plug in firmly.
FWD
HOLD
VOL
REW (–)
FF (+)
SOUND
MODE
bB•x**
REV

6
WM-EX651
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-2. CASE ASSY
CASE ASSY
(Page 6)
CASSETTE
LID ASSY
(Page 8)
ORNAMENT
(OPEN) ASSY
(Page 9)
BELT (F4)
(Page 7)
HOLDER (FS)
ASSY
(Page 9)
MAIN BOARD
(Page 7)
MAGNETIC, HEAD
(HP901)
(Page 10)
PINCH LEVER
(N)/(R) ASSY
(Page 10)
MOTOR (CAPSTAN/REEL) (M901)
(Page 8)
SET
1 lid,battery case
claw
2 screw
(M1.4
× 2.5)
3 two screws
(M1.4
× 2.5)
4 two screws
(M1.4
× 2.5)
5 Remove the case assy
in the direction of the arrow.
3-1. DISASSEMBLY FLOW
Note: Follow the disassembly procedure in the numerical order given.

7
WM-EX651
3-3. MAIN BOARD
3-4. BELT (F4)
SLIDER
Note : When assembling the MAIN board,
align the slider with the position of S701.
head flexible board
1 shielded sheet
7 screw
(M1.4)
8 MAIN board
2 Remove soldering (six points)
from the head flexible boards.
3 Remove soldering (four points)
from the leaf switch.
4 Remove soldering (two points)
from plunger solenoid.
S701
6 two screws
5 Remove soldering (four points)
from motor.
3 belt (F4)
motor
pulley
insert flywheel
(R)
insert flywheel (N)
pulley (reverse)
2 terminal board
(battery
# )
1 Remove soldering from
the battery terminal board.
belt (F4)

8
WM-EX651
3-5. MOTOR (CAPSTAN/REEL) (M901)
3-6. CASSETTE LID ASSY
2 motor (capstan/reel)
(M901)
1 two screws
(M1.4)
2 two screws
(M1.4
× 2.0)
2 screw (M1.4 × 2.0)
4 cassette lid assy
1 Open the cassette lid.
3 shaft

9
WM-EX651
3-7. ORNAMENT (OPEN) ASSY
3-8. HOLDER (FS) ASSY
1 two claws
5 ornament (open) assy
3 boss
4 two claws
2 claw
9 Remove soldering from
six head flexible boards.
0 Remove the holder (FS)
assy in the direction of
the arrow.
8 shielded sheet
1 two screws
(ib lock)
3 lock lever (B)
2 shaft
7 bracket (cassette) assy
6 shaft
4 screw (M1.4
)
5 shaft

10
WM-EX651
3-9. PINCH LEVER (N)/(R) ASSY
3-10. MAGNETIC HEAD (HP901)
1 claw
2 Remove the pinch lever (R)
assembly in the direction of
the arrow.
4 Remove the pinch lever (N)
assembly in the direction of
the arrow.
holder (FS) assy
3 claw
1 two claws
2 Remove the magnetic head.
(HP901)
holder (FS) assy

WM-EX651
1111
WM-EX651
PRECAUTION
1. Specified voltage: 1.3 V (DC)
2. Switch position
HOLD : OFF
Test Tape
Tape Speed Adjustment
Procedure:
1. Enter the FWD playback mode.
2. Adjust RV601 so that the value of the frequency counter
reading becomes 3,000 Hz.
Specification value:
Frequency counter
2,970 Hz – 3,030 Hz
3. Check that the frequency deviation at the beginning and ending
of a tape is within 1.5 % (45 Hz).
Adjustment Point:
[MAIN BOARD] — SIDE B —
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. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
• Torque Measurement
Mode Torque Meter Meter Reading
14.7 to 24.5 mN•m
FWD CQ-102D (15 to 25 g•cm)
(0.22 to 0.34 oz•inch)
FWD 0.294 to 1.96 mN•m
Back Tension CQ-102D (0.3 to 2.0g•cm)
(0.007 to 0.020 oz•inch)
14.7 to 24.5 mN•m
REV CQ-102C (15 to 25 g•cm)
(0.22 to 0.34 oz•inch)
REV 0.294 to 1.96 mN•m
Back Tension CQ-102C (0.3 to 2.0 g•cm)
(0.007 to 0.020 oz•inch)
More than 34.3 mN•m
FF, REW CQ-201B (More than 35 g•cm)
(More than 0.69 oz•inch)
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
3
RV601
Signal
3 kHz, 0 dB
Used for
Tape Speed Adjustment
Tape
WS-48A
Test tape
WS-48A
(3kHz, 0dB)
Set
iREMOTE jack (J301)
16 Ω
Frequency counte
r
+
–
MEMO

WM-EX651
1212
WM-EX651
For schematic diagrams.
Note:
•All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
•%: indicates tolerance.
•C: panel designation.
•A: B+ Line.
•H: adjustment for repair.
•Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
no mark : PLAY
•Voltages and waveforms are dc with respect to ground in
playback mode.
•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
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
Caution:
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•x: parts extracted from the conductor side.
•®: Through hole.
•: Pattern from the side which enables seeing.
6-1. IC BLOCK DIAGRAMS
IC301 TA2123AF (EL)
PRE A PRE B
MIX
PW B
PW A
PW C
BST
MT TC
BASE
RF IN
PW GND
PW OUT-R
PW OUT-C
PW OUT-L
VCC
RF OUT
REF OUT
BST NF
BST OUT
PW IN C
LPF
EQ-L
PW NF-L PW IN-L
PW IN-R
PW NF-R
3
REV IN-L
5
PRE NF-L
6
PRE OUT-L
7
MTL DRV-L
8
MTL DRV-R
9
PRE OUT-R
10
PRE NF-R
11
AMS IN
12
REV IN-R
4
FWD IN-R
2
FWD IN-L
1
21
20
19
18
17
GND
16
AMS DET
15
AMS MIX
14
AMS SW
13
22
23
24
38
CAMP SW
37
PW SW
42
MT SW
41
F/R SW
44
BST SW
43
M/N SW
46
PRE GND
47
VREF IN
48
PRE SW
45
AMS OUT
40
BEEP
39
262728293031323334
AGC DET
36
AGC IN
35
+
–
+ –
+ –
+ –
+
–
+
–
EQ-R
25
RIPPLE
FILTER
AGC
DET
BEEP
VREF
SWITCH COMPARATOR
MTL DRV
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
+
–
SECTION 6
DIAGRAMS
• Waveforms
30 Vp-p
10 µ sec
1.3 Vp-p
30
µ sec
20 mVp-p
1.5 m sec
1V/DIV, 5 µ s/DIV
0.5V/DIV, 10
µ s/DIV
20mV/DIV, 0.5 ms/DIV
1 IC702 4 LX
2 IC701 wk XTO
3 IC601 5 OSC

WM-EX651
1313
WM-EX651
6-2. BLOCK DIAGRAM
+
–
PREAMP
AMS
AGC
DET
BEEP
V/I
EQ
METAL
CONTROL
SPEED
CONTROL
DIRECTION CONTROL
PHOTO REFLECTOR
SWITCH & BUFFER
Q702
PLUNGER
DRIVE
Q701
AVLS CONTROL
SWITCH
Q304
MEGA BASS/GROOVE
SWITCHING
Q303
RIPPLE FILTER
Q301
RESET SIGNAL
GENERATOR
IC703
REGULATOR
IC704
Q604
MOTOR
CONTROL SWITCH
ROTATION DETECT
SENSOR
PH701 CAPSTAN/REEL
MOTOR DRIVE
IC601
SYSTEM CONTROLLER
IC701
M901
BATT B+
(CAPSTAN/REEL)
HP901
(PLAYBACK)
AUDIO MASTER AMP
IC301
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
REVIVE/GROOVE
SWITCHING
Q302
DC/DC
CONVERTER
IC702 DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
1PC. 1.5V
BATTERY PACK
(NI-CD)
(NC-10WM 1.2V)
VDD B+
DDC B+
BATT B+
BATT
B+
X701
32.768kHz
Q603
CUE/REVIEW
SWITCH
Q605
FF/REW CTL
SWITCH
TH601
TAPE SPEED
RV601
SPEED CONTROL
RV602 FAST
SLOW
START
VREF
IN+
COMPARATOR
VSP
OUT
VCC
DATA
REMOTE
GND
BATT B+
BATT B+
BASE
PW OUT-L
PW OUT-R
PW OUT-C
POWER AMP
POWER AMP
POWER AMP
PW
NF-L
BASS BOOST
AMP
PW
IN-L
PW
IN-C
BST
OUT
VOL
RV301
HOLD
S707
i
J301
S901-2
(ATS)
PRE
OUT-L
MTL
DRV-L
FWD
IN-L
REV
IN-L
L-CH
R-CH
FWD
L-CH
R-CH
REV
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
S701
(DIRECTION)
OSC
RESTART MOTOR
MOTOR DIR
AMS OUT
F/R SW
M/N SW
35
8
7
5
DR
6
10
9
11
W
3
V
1
U
WV
U
19
48
XT0
28
XT1
29 46
18
VCC
19
RF OUT
17
20
22
21
29
EQ-L 30
40
BST SW
43
AGC IN
35
BEEP
39
28
32
33
AMS
IN
12
7
8
4644
F/R CTL
9
CASSETTE SW
5
REV SW
4
CENTER SW
3
FWD SW
2
AUDIO ATT
AVLS
CTL
38
R-CH
47
MEGA BASS CTL
8
AMS IN
39
BOOST CTL
10
REVIVE
CTL
FF/REW CTL
7
1
SPEED CTL
44
MOTOR CTL
45
VDD
23
SET STOP 1
13
BEEP
36
MT SW
41
MUTE CTL
19
PW SW
42
AMP CTL
11
DATA/RMUM
6
KEY IN
16
HOLD
12
K2 (IN 2)
43
KO1 (OUT 1)
40
KO2 (OUT 2)
41
K1 (IN 1)
42
1
5
S901-1
(TAPE DETECT)
+
+
+
FWD
STOP
REV
OFF ON
IN PHOTO 37
PHOTO CTL 18
PM CTL PM901
(PLUNGER)
17
DDC B+
DDC
B+
SET STOP 2
14
BATT DET
15
SPCON C
20
RESET
+
CUE REVIEW
VOLUME SWITCH
Q306
S706
REW/REVIEW
S703
x
S704
Y
S705
AMS
FF/CUE
•R-ch is omitted due to same as L-ch.
•Signal path
E: PLAYBACK

WM-EX651
1414
WM-EX651
6-3. SCHEMATIC DIAGRAM – MAIN SECTION (1/2) – •See page 12 for IC Block Diagrams.
R101
R201 C201
R203
R106
R206
C109
C209
R103
C319
C320
C302
R302
C304
R213
R113
J301
D710
R726
R208
C203
C103 R108
R305
C307
C309
C312
C311
R307
R309
C310 C326
C308
FB101
FB201
CB303
R112
R212
Q304
R211 R111
C207 C107
R215 R115
R114
R214
C102
C202
C111
C211
C315 C317
C306
R306
C305
C303
R303
R304
CB301
C301
C325
R102 R120
R202
R207
R107
R220
C208
R205
R105
JC301
D712
C314
C313
C316
R109
R209
R717
C712
C101
R104 C108
C321
Q301
R204
Q302
Q303
Q306
IC301
RV301
S901
TP60
220k
220k 47
4V
100
1k
1k
0.047
0.047
100
0.1
4700p
0.1
220k
1
470k
470k
MA8062
1k
2.2
1
12.2
22k
0.22
0.22
1
0.1
2.2k
470k
2.2
6.3V 0.22
0.1
0
0
0.022
220
220
RT2N20M
4.7k 4.7k
0.22 0.22
220 220
470k
470k
1
1
1000p
1000p
2.2 2.2
4.7
4V
4.7
220
2V
4.7
4V
10k
22k
470P
47
2.5V
220p
47k 4.7k
47k
22k
22k
4.7k
0.022
1k
1k
MA8062
2.2
6.3V
4.7
4V
1
1k
1k
1k
1
47
4V
2.2k 0.022
1000p
2SB815B7-TB
RIPPLE
FILTER
2.2k
RT2P20M
REVIVE/GROOVE
SWITCHING
RT2P20M
MEGA BASS/GROOVE
SWITCHING
RT2N20M
CUE REVIEW
VOLUME SWITCH
TA2123AF (EL)
30k/30k
REVIVE
MEGA BASS
VCC
GND
CASSETTE
GND 2
DATA/RMUM
AUDIO
AVLS
REMOTE
BEEP
AMS
MUTE
BOOST
F/R
AMP
A1
A2
A3
A4
A1
A2
A3
A4
HEAD
HP901
PLAYBACK
R-CH
L-CH
R-CH
L-CH
BOARD
MAIN
(2/2)
(Page15)
VOL
-2
-1
(TAPE DETECT)
(ATS)

WM-EX651
1515
WM-EX651
6-4. SCHEMATIC DIAGRAM – MAIN SECTION (2/2) – •See page 12 for IC Block Diagrams. • See page 11 for Waveforms.
C608
C606
C604
C603
R602
C602
C601
R601
C709
R714
PH701
R801
R701
PM901
R703
L701
C607
IC701
R802
Q702
JC601
RV601
R603
JC702
JC901
JC701
S703
R727
R728
R729
R730
C701
R704
R705
R706
R707
R709
R738 R715
R741
S707
R747
R748
C710
X701
C703
C704
C705
D711
C706
C707
R733 R720
R721
R734
R735
IC703
R731
R712
C708
C711
R732
R832
R605 R609
C327
TH601
C605
R718
RB601
R702
C702
S701
R708
R713 R710
R711 C609
R739
R746
S705
RV602
R608
Q604
TP53
D701
D702
IC601
IC702
IC704
Q701
S704
M901
Q603
0.01
0.01
0.1
0.22
100
0.1
1
22k
1
22
PR-20-T
2.2k
4.7k
470k
0.01
ML63512
-133TBZ020
1M
DTC114TUA
4.7k
2.2k
10k
10k
10k
10k
22
6.3V
470k
470k
470k
470k
100k
100k 220k
100k
10k
1k
1000p
32.768kHz
10p
0.1
1
MA8062
1
1
100k 10k
470
2.2k
4.7k
PST9008NL
10k
470k
1
1
470k
220k
1k 4.7k
1000p
0.1
1k
220k
2.2M
10
10V
220k
47k 470k
470k 4.7
4V
470k
1M 4.7k
(SPEED CONTROL)
470
DTC114TUA
MOTOR
RESEART
(P.IN)
MA111-TX
MA2ZD14001S0
MM1279XVBE
XC6371C251PL
S-817B11AMC
-CWAT2G
2SA1362YG
PLUNGER DRIVE
RT2N20M
QUE/REVIEW
SWITCH
MEGA BASS
REVIVE
VCC
GND
CASSETTE
GND 2
DATA/RMUM
AUDIO
AVLS
REMOTE
BEEP
AMS
MUTE
BOOST
F/R
AMP
HOLD
IN PHOTO
KO1
KO2
K1
K2
SPEED CTL
MOTOR CTL
MOTOR DIR
AUDIO ATT
RESTART MOTOR
AMS IN
VDDH
VDD
VSS
VDD1
SPCON C
MUTE CTL
PHOTO CTL
PM CTL
KEY IN
BATT DET
SET STOP 2
SET STOP 1
BEEP
RESET
OSC1
OSC0
OSCM
TST2B
TST1B
XT1
XT0
VDDL
CB2
CB1
CENTER SW
REV SW
CASSETTE SW
FF/REW CTL
DATA/RMUM
RWVIVE CTL
MEGA BAS CTL
BOOST CTL
AMP CTL
HOLD
F/R CTL
FWD SW
ON
OFF
(BATTERY CASE)
BATTERY
(NICKEL-CADMIUM)
RECHARGEABLE
BOARD
MAIN
(1/2)
(Page14)
NH-10WM 1PC,1.2V MOTOR
CAPSTAN/REEL
AVLS CTL

WM-EX651
1616
WM-EX651
6-5. PRINTED WIRING BOARD – MAIN SECTION (SIDE A) – : Uses unleaded solder.
E
E
E
EE
E
13
54
112
13
24
48
37
36 25
112
13
24
48
37
36 25
13
54
-1
-2
C703
C315
C317
C316
C710
C308 C326
C309
C304
C312
C102
C202
C305
X701
R832
R731
R710
R732
R718
R712
C601
RB601
CB303
C605
C607
C709
C711
C707
C708 C705
PH701
R603 R703 R701
R801
R702 R802
R711
R609
R608 R605 R601
C602
C604
R602
R611
Q603
C609
C702 IC702
S701
(DIRECTION)
REV T STOP T FWD
S707
C701
C310
C306
C303
RV301
Q604
Q301
Q702
RV601
(TAPE SPEED)
TH601
D702
L701
D711
R717
R307
R746
R748
R747
R209 R109
R733 R720
R726
D710
D712
IC703
IC701
IC301
Q303 Q302
N
VOL
OFF
ON
11
(11)
1-864-362-
i
J301
MAIN BOARD (SIDEA)
HOLD
23 4 5 6 7 8
A
1
B
C
D
E
F
Ref. No. Location
D702 E-3
D710 A-7
D711 B-5
D712 A-7
IC301 D-7
IC701 C-5
IC702 E-3
IC703 C-4
Q301 D-7
Q302 C-7
Q303 C-7
Q603 C-2
Q604 C-2
Q702 C-3
•Semiconductor Location

WM-EX651
1717
WM-EX651
6-6. PRINTED WIRING BOARD – MAIN SECTION (SIDE B) – : Uses unleaded solder.
E
E
13
54
110
20 11
1
1234562
3
4
5
6
L-CH
R-CH
R-CH
L-CH
FWD
REW
FF/
CUE
REW/
REVIEW
PLAY/
REPEAT
x
STOP
PM901
PLUNGER
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
1PC, 1.5V
BATTERY PACK
(NICKEL-CADMIUM)
NH-10WM 1PC,1.2V DC IN 1.5V
VCC
W
V
U
V
W
U
VCC
M901
CAPSTAN/REEL
MOTOR
B B
HP901
PLAY BACK
HEAD
C603
C606
C608
C327
C207
C325
C107
C211 C319
C320
C311
C307
C111
C706
C704
C712
C203
C103
C321
TP35
TP11
TP56
TP12
TP10
TP60
TP8
TP9
TP44
TP4
TP5
TP3 TP2 TP1
TP40
TP37
TP38
TP39
TP36
TP23
TP55
TP34
SL301
SL302
CB301
C101
C201
C313
C301 C314
R111
R211
C108
C109
R120
R104
R105 C209
C208
C302
R204
R201R202
R205
R102
R735
R714
R208
R108
R112 R212 R215
R704
R707 R715
R115
R729
R728
R730
S704
S703
R713
R727
R741
R734
R721
R103 R101
R207
R107 R302 R304
R309
R303
R203
R305
R220 R206
R106
R739
R706
R705 R708
R709 R738
R213
R214
R114
R306
R113
FB201
FB101
Q304 Q306
D701
Q701
TP31
TP46
TP45 TP24 TP51
TP51 TP52
TP53
(P.IN)
TP54
TP58
TP18
TP19 TP17
TP22
TP13
TP25 TP26
TP27
TP20
TP59
TP21
TP14
(GND)
TP28
TP16
TP15
TP42
RV602
(SPEED CONTROL)
TP43
TP32TP33
TP29
TP30
S705
IC704
IC601
S901-2
ATS SW
S901-1
TAPE DETECT
SWITCH
11
(11)
1-864-362-
MAIN BOARD (SIDE B)
23 4 5 6 7 8
A
1
B
C
D
E
F
Ref. No. Location
D701 B-3
IC601 C-6
IC704 E-5
Q304 C-2
Q306 C-2
Q701 B-3
•Semiconductor Location

WM-EX651
1818
WM-EX651
Pin No. Pin Name I/O Description
1FF/REW CTL O Motor speed control signal output “H”: FF/REW
2 FWD SW I Direction switch signal input “L”: FWD
3 CENTER SW I Direction switch signal input “L”: CENTER
4REV SW I Direction switch signal input “L”: REV
5CASSETTE SW I
Cassette detection switch signal input
“L”: with cassette “H”: without cassette
6DATA/RMUM I/O
Serial data output of communication with the remote commander having phone, and the
remote control sensing signal input from remote commander having phone
7REVIVE CTL O
Tone selection signal output to TA2123AF
“L”: REVIVE “H”: OFF/MEGA BASS/GROOVE
8MEGA BASS CTL O
Tone selection signal output to TA2123AF
“L”: MEGA BASS “H”: OFF/REVIVE/GROOVE)
9 F/R CTL O FWD/REV head selection signal output to TA2123AF “L”: FWD “H”: REV
10 BOOST CTL O Power supply ON/OFF control signal output to TA2123AF “L”: OFF “H”: ON
11 AMP CTL O
power supply ONPower supply ON/OFF control signal output to TA2123AF
“L”: power supply OFF “H”: power supply ON
12 HOLD I HOLD switch detection signal input “L”: HOLD ON
13 SET STOP 1 I Battery voltage detection input when the machine is stopped. (A/D input)
14 SET STOP 2 I Reference voltage input when the machine is stopped. (A/D input)
15 BATT DET I Battery voltage detection input (A/D input)
16 KEY IN I Key signal input from remote commander (A/D input)
17 PM CTL O Plunger drive signal output “L”: plunger ON
18 PHOTO CTL O
Control signal output to the rotation detection circuit of the capstan/reel
“L”: rotation detection circuit ON
19 MUTE CTL O
Audio mute control signal output to TA2123AF
“L”: mute ON “H”: mute OFF
20 SPCON C O
Motor speed control cancel signal output
“high impedance”: cancel, “L”: normal
21 VDD1 — Power supply (+2.5 V)
22 VSS — Ground
23 VDD — Power supply (+1.1 V)
24 VDDH — Step-up power supply terminal for back-up
25 CB1 — Terminal to which capacitor for step-up power supply is connected
26 CB2 — Terminal to which capacitor for step-up power supply is connected
27 VDDL — Power supply terminal for internal logic
28 XT0 O Crystal oscillator output (32.768 kHz)
29 XT1 I Crystal oscillator input (32.768 kHz)
30 TST1B I Test input (Not used) (Connected to VDD)
31 TST2B I Test input (Not used) (Connected to VDD)
32 OSCM — Not used (open)
33 OSC0 — Not used (open)
34 OSC1 O Not used (open)
35 RESET I System reset signal input “L”: reset
36 BEEP O Beep signal output to TA2123AF
37 IN PHOTO I Rotation detection input of capstan/reel
38 AVLS CTL O AVLS ON/OFF control signal output “L”: AVLS OFF, “H”: AVLS ON
39 AMS IN I AMS detection signal input from TA2123AF
40 KO1 (OUT 1) O Key matrix signal output
6-7. IC Pin Function Descriptions
• IC701 ML63512-133TBZ020 (SYSTEM CONTROL) (MAIN BOARD)
Pin No. Pin Name I/O Description
41 KO2 (OUT 2) O Key matrix signal output
42 K1 (IN 1) I Key matrix signal input
43 K2 (IN 2) I Key matrix signal input
44 SPEED CTL O Tape speed control signal output
45 MOTOR CTL O Motor start control signal output to MM1279XVBE “H”: motor ON
46 MOTOR DIR O
Motor direction control signal output to MM1279XVBE
“L”: clockwise “H”: counter-clockwise
47 AUDIO ATT O
Audio attenuation ON/OFF control signal output
“L” : OFF “H” : ON
48 RESTART MOTOR O Signal output for motor start-up status control to MM1279XVBE

19
WM-EX651
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SECTION 7
EXPLODED VIEWS
7-1. CASE SECTION
NOTE:
•-XX, -X mean standardized parts, so they may
have some differences from the original one.
•Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
•Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑ ↑
Parts of Color Cabinet’s Color
•The mechanical parts with no reference number
in the exploded views are not supplied.
•Hardware (# mark) list and accessories are
given in the last of this parts list.
1
2
3
3
3
4
5
6
7
8
9
10
11
12
13
13
14
15
16
17
18
19
20
21
22
23
24
main board block
12-188-343-01 SPEED, BRACKET (SILVER)
12-188-343-11 SPEED, BRACKET (BLUE)
12-188-343-21 SPEED, BRACKET (PINK)
22-188-351-01 KNOB (SPEED) (SILVER)
22-188-351-11 KNOB (SPEED) (BLUE)
22-188-351-21 KNOB (SPEED) (PINK)
33-225-996-11 SCREW (M1.4) (EG), PRECISION PAN
42-188-355-01 BUTTON (PLAY) (SILVER)
42-188-355-11 BUTTON (PLAY) (BLUE)
42-188-355-21 BUTTON (PLAY) (PINK)
52-188-359-01 SHEET (PLAY), ADHESIVE
6 2-188-356-01 BUTTON (STOP) (SILVER)
62-188-356-11 BUTTON (STOP) (BLUE)
62-188-356-21 BUTTON (STOP) (PINK)
72-189-000-01 SHEET (STOP), ADHESIVE
82-188-354-01 PLATE, ORNAMENTAL
92-188-353-01 RACK (SPEED)
10 2-189-001-01 SHEET (ORNAMENTAL PLATE)
11 3-225-873-09 SCREW (M1.4)
12 2-188-357-01 LID, BATTERY CASE (SILVER)
12 2-188-357-11 LID, BATTERY CASE (BLUE)
12 2-188-357-21 LID, BATTERY CASE (PINK)
13 3-704-197-11 SCREW (M1.4X2.0), LOCKING
14 X-2023-852-1 LID ASSY (S), CASSETTE (SILVER)
14 X-2023-853-1 LID ASSY (L), CASSETTE (BLUE)
14 X-2023-854-1 LID ASSY (P), CASSETTE (PINK)
15 2-514-392-11 COVER, MD
16 2-188-340-01 CASE (SILVER)
16 2-188-340-11 CASE (BLUE)
16 2-188-340-21 CASE (PINK)
17 2-189-003-01 PLATE (HOLD), ORNAMENTAL (SILVER)
17 2-189-003-11 PLATE (HOLD), ORNAMENTAL (BLUE)
17 2-189-003-21 PLATE (HOLD), ORNAMENTAL (PINK)
18 2-188-350-01 KNOB (HOLD) (SILVER)
18 2-188-350-11 KNOB (HOLD) (BLUE)
18 2-188-350-21 KNOB (HOLD) (PINK)
19 2-188-346-01 CAM (HOLD)
20 2-188-349-01 SPRING (HOLD)
21 2-188-348-01 SPRING (FR)
22 2-188-352-01 KNOB (FR) (SILVER)
22 2-188-352-11 KNOB (FR) (BLUE)
22 2-188-352-21 KNOB (FR) (PINK)
23 2-188-345-01 CAM (FR)
24 2-188-344-01 BRACKET (FR) (SILVER)
24 2-188-344-11 BRACKET (FR) (BLUE)
24 2-188-344-21 BRACKET (FR) (PINK)

20
WM-EX651
7-2. MAIN BOARD SECTION
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
51
52
53
54
51
55
56
70
57
58
59
60
61
62
63
64 65 66
S901
67
68
69
mechanism deck section-1
(MT-WMEX610-162)
51 3-375-114-71 SCREW
52 A-1078-710-A MAIN BOARD COMPLETE
53 2-188-347-01 GEAR (SPEED)
54 3-345-648-71 SCREW (M1.4), TOOTHED LOCK
55 3-029-213-01 TERMINAL BOARD, BATTERY
56 3-038-056-11 TERMINAL BOARD (MINUS) (/M)
57 3-031-460-01 SHEET (BT)
58 X-3383-152-2 TERMINAL BOARD ASSY, BATT
59 3-365-630-41 SCREW (M1.4)
60 X-3377-719-1 BRACKET (CASSETTE) ASSY (/M)
61 X-3377-718-1 LEVER (A) ASSY (/M), LOCK
62 3-224-837-01 SHEET (ATS)
63 3-038-054-02 LEVER (B) (/M), LOCK
64 3-939-590-05 SCREW (IB LOCK)
65 X-3377-717-5 BRACKET ASSY (/M)
66 3-389-523-02 SCREW (IB LOCK)
67 3-221-628-41 ORNAMENT (OPEN) (SILVER)
67 3-221-628-51 ORNAMENT (OPEN) (BLUE)
67 3-221-628-61 ORNAMENT (OPEN) (PINK)
68 3-029-220-11 SPRING, TENSION
69 3-221-629-11 KNOB (OPEN) (SILVER)
69 3-221-629-21 KNOB (OPEN) (BLUE)
69 3-221-629-31 KNOB (OPEN) (PINK)
70 3-032-323-01 PAPER (A), SHIELD
S901 1-762-553-11 SWITCH, LEAF (ATS/TAPE DET)