Sony WMEX-651 Service manual
WM-EX651
SERVICE MANUAL
Ver 1.0 2004.09
Model Name Using Similar Mechanism WM-EX631
Tape Transport Mechanism Type MT-WMEX610-162
SPECIFICATIONS
E Model
Chinese Model
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
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.
9-879-142-01
2004I02-1
© 2004.09
CASSETTE PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
WM-EX651
N
TABLE OF CONTENTS
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
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.
otes 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
WM-EX651
[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 photoreflector (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
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.
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
Note 3: If a headphones are used, the beep sound shows the timing of the
REW/REVIEW (S706) switches, use these switches of the
remote control unit as much as possible.
FWD/REV switch (S701).
TAPE DETECT
SWITCH
(S901-1)
Short
ATS
SWITCH
(S901-2)
Plunger (PM901)
Battery
terminal
#
FWD
PH701
x
TP53
(P.IN)
S701
←
STOP →REV
– MAIN BOARD (SIDE B) —
AF OSC
Square-wave
(sine wave)
10 Hz, -3.5 dB
M
TP14
(GND)
Battery terminal
3
M901
3
WM-EX651
)
)
[ 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)
Clutch Assy (F)
Insert Flywheel (N)
Tape drive mechanism in FF mode Tape drive mechanism in REW mode
Gear (REEL) (S side)
Motor Pulley
Pulley (Reverse
Insert Flywheel (R)
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
HOLD
VOL*
SECTION 2
GENERAL
Plug in firmly.
WM-EX651
This section is extracted
from instruction manual.
REV
FWD
HOLD
VOL
REW/REVIEW•FF/CUE
bB PLAY/REPEAT**
x STOP
SPEED CONTROL
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.
REW (–)
FF (+)
SOUND
MODE
bB•x**
5
WM-EX651
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
MAIN BOARD
(Page 7)
(Page 8)
CASE ASSY
(Page 6)
ORNAMENT
(OPEN) ASSY
(Page 9)
SET
CASSETTE
LID ASSY
Note: Follow the disassembly procedure in the numerical order given.
3-2. CASE ASSY
claw
HOLDER (FS)
ASSY
(Page 9)
BELT (F4)
(Page 7)
PINCH LEVER
(N)/(R) ASSY
(Page 10)
MOTOR (CAPSTAN/REEL) (M901)
(Page 8)
MAGNETIC, HEAD
(HP901)
(Page 10)
1
lid,battery case
2
screw
(M1.4
×
2.5)
4
two screws
(M1.4
×
2.5)
3
(M1.4
5
Remove the case assy
in the direction of the arrow.
two screws
×
2.5)
6
3-3. MAIN BOARD
2
from the head flexible boards.
3
Remove soldering (four points)
from the leaf switch.
Remove soldering (six points)
4
Remove soldering (two points)
from plunger solenoid.
WM-EX651
8
MAIN board
7
(M1.4)
1
shielded sheet
screw
head flexible board
S701
6
two screws
5
Remove soldering (four points)
from motor.
SLIDER
Note : When assembling the MAIN board,
align the slider with the position of S701.
3-4. 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-EX651
3-5. MOTOR (CAPSTAN/REEL) (M901)
2
motor (capstan/reel)
(M901)
1
two screws
(M1.4)
3-6. CASSETTE LID ASSY
2
two screws
×
(M1.4
2.0)
2
screw (M1.4 × 2.0)
4
cassette lid assy
1
Open the cassette lid.
3
shaft
8
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