Sony WMEX-631 Service manual
WM-EX631
SERVICE MANUAL
Ver 1.2 2004.03
Model Name Using Similar Mechanism WM-EX621
Tape Transport Mechanism T ype MT -WMEX610-162
SPECIFICATIONS
AEP Model
UK Model
E Model
Chinese Model
Tourist Model
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
Load impedance 8 - 300 Ω
Power requirements
1.5 V
Rechargeable battery
One R6 (size AA) battery
Dimensions (w/h/d)
Approx. 77.1 × 108.1 × 20.4 mm (excl. projecting parts and
controls)
Mass
Approx. 142 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.
9-874-181-03
2004C16-1
© 2004.03
CASSETTE PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
WM-EX631
TABLE OF CONTENTS
1. SERVICE NOTE ······························································· 3
2. GENERAL ·········································································· 5
3. DISASSEMBLY
3-1. Case Sub Assy································································· 6
3-2. Main Board ····································································· 7
3-3. Belt (F4) ·········································································· 7
3-4. Motor (Capstan/Reel) (M901) ········································ 8
3-5. Lid Assy, Cassette ··························································· 8
3-6. Ornament, Reel ······························································· 9
3-7. Holder (FS) Assy ···························································· 9
3-8. Lever (N)/(R) Assy, Pinch ············································· 10
3-9. Head, Magnetic (HP901) ·············································· 10
4. MECHANICAL ADJUSTMENT ································ 11
5. ELECTRICAL ADJUSTMENT ·································· 11
6. DIAGRAMS
6-1. Block Diagram ······························································ 12
6-2. Note For Printed Wiring Boards and
Schematic Diagrams ····················································· 13
6-3. IC Block Diagrams ······················································· 13
6-4. Schematic Diagram – MAIN Board – ·························· 14
6-5. Printed Wiring Board – MAIN Board –························ 15
6-6. IC Pin Function ····························································· 16
7. EXPLODED VIEWS
7-1. Cabinet Block ······························································· 17
7-2. Main Board Block ························································· 18
7-3. Mechanism Block – 1 (MT-WMEX610-162) ··············· 19
7-4. Mechanism Block – 2 (MT-WMEX610-162) ··············· 20
8. ELECTRICAL PARTS LIST ······································· 21
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.
Notes on the AC power adaptor
•Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
Polarity of
the plug
•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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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
PUBLISHED BY SONY.
2
SECTION 1
SERVICE NOTE
[Service Mode]
The service mode enables to operate the mechanism of WM-EX631
while the MAIN board is opened.
Rotation of the idler gear (A) (S side) is detected using the photoreflector (PH701) in the WM-EX631. 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 3
and # terminals of the battery.
2. PRE-SET status
The PLAY, FF and REW modes can be entered only from the PRESET 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.
WM-EX631
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 x switch (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 x switch (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).
TAPE DETECT
SWITCH
(S901-1)
Short
ATS
SWITCH
(S901-2)
Y
(S704)
REPEAT
Plunger (PM901)
Battery
terminal
FF/CUE
(S705)
#
FWD
x
(S703)
PH701
S701
←
STOP →REV
– MAIN BOARD (SIDE B) —
AF OSC
Square-wave
(sine wave)
10 Hz, -3.5 dB
TP53 (P.IN)
REW/REVIEW
(S706)
M
TP14
(GND)
Battery terminal
3
M901
3
WM-EX631
)
)
[ Slider (NR) ] [ Tape drive mechanism ]
Tape drive mechanism in PLAY mode
Gear (FR)
(REW:Right side)
Idler Gear (A) (S side)
Slider (NR)
Cam Gear
F side R side
Center
Gear (Y)
Insert Flywheel (N)
Clutch Assy (F)
Insert Flywheel (R)
Tape drive mechanism in FF mode Tape drive mechanism in REW mode
Gear (REEL) (S side)
Motor Pulley
Pulley (Reverse
Idler Gear
(A) (T side)
Gear (REEL) (T side)
Cam Gear
Gear (Y)
Insert Flywheel (N)
Gear (FR)
(FF:Left side)
Clutch Assy (F)
Motor Pulley
Pulley (Reverse)
Insert Flywheel (R)
Gear (NR)
(FWD:Left side
Idler Gear
(A) (T side)
Gear
(REEL) (T side)
Cam Gear
Gear (Y)
Insert Flywheel (N) Insert Flywheel (R)
REV:Right side)
Clutch Assy (F)
Idler Gear (B)
Idler Gear (A) (S side)
Gear (REEL) (S side)
Motor Pulley
Pulley (Reverse
4
SECTION 2
GENERAL
REV
FWD
Plug in firmly.
WM-EX631
This section is extracted
from instruction manual.
HOLD
HOLD
VOL*
SPEED CONTROL
Y•REPEAT**
x
FF/CUE•AMS
REW/REVIEW•AMS
OPEN
* 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.
VOL
REW (–)
FF (+)
SOUND
MODE
Y•x**
5
WM-EX631
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure as shown in the flow chart below.
SET
LID ASSY,
CASSETTE
CASE SUB
ASSY
ORNAMENT,
REEL
MAIN BOARD
HOLDER (FS)
ASSY
Note : Follow the disassembly procedure in the numerical order given.
3-1. Case Sub Assy
claw
BELT (F4)
LEVER (N)/(R)
ASSY, PINCH
MOTOR (CAPSTAN/REEL) (M901)
HEAD, MAGNETIC
(HP901)
1
lid,battery case
2
screw
(M1.4
×
2.5)
4
two screws
(M1.4
×
2.5)
5
Remove the case sub assy
in the direction of the arrow.
S707
3
two screws
(M1.4
knob (HOLD)
Note : When assembling the case
sub assy,align the knob (HOLD)
with the position of S707.
×
2.5)
6
3-2. MAIN Board
3
Remove soldering (four points)
from the leaf switch.
2
Remove soldering (six points)
from the head flexible boards.
4
Remove soldering (two points)
from plunger solenoid.
WM-EX631
8
MAIN board
1
shielded sheet
7
screw
(M1.4)
head flexible board
S701
SLIDER
Note : When assembling the MAIN board,
align the slider with the position of S701.
6
two screws
5
Remove soldering (four points)
from motor.
3-3. Belt (F4)
belt (F4)
insert flywheel
(R)
pulley (reverse)
insert flywheel (N)
motor
pulley
2
terminal board
(battery
3
belt (F4)
1
Remove soldering from
the battery terminal board.
#
)
7
WM-EX631
3-4. Motor (Capstan/Reel) (M901)
2
motor (capstan/reel)
(M901)
1
two screws
(M1.4)
3-5. Lid Assy, Cassette
2
two screws
(M1.4
×
2.0)
2
screw (M1.4 × 2.0)
4
lid assy, cassette
1
Open the cassette lid.
3
shaft
8
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