SERVICE MANUAL
Ver 1.1 2001.01
9-873-015-12
Sony Corporation
2001A0500-1
Audio Entertainment Group
C
2001.1
General Engineering Dept.
CASSETTE PLAYER
AEP Model
E Model
Chinese Model
Tourist Model
SPECIFICATIONS
WM-EX910
Photo: Blue model
Manufactured under license from Dolby Laborato-
ries.
"Dolby" and the double-D symbol are trademarks of
Dolby Laboratories.
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MT-WMEX910-162
Battery life
(Approx. hours)
(in playback)
(EIAJ*)
Rechargeable NC-6WM
20
fully charged
Sony alkaline LR6 (SG)**
66
Rechargeable NC-6WM
84
Sony alkaline LR6 (SG)
used together
* Measured value by the standard
of EIAJ (Electronic Industries
Association of Japan). (Using a
Sony HF series cassette tape)
**When using a Sony LR6 (SG)
"STAMINA" alkaline dry battery
(produced in Japan).
Frequency response(Dolby NR off)
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
Load impedance 8 - 300
Power requirements
1.5 V
One rechargeable battery
One R6 (size AA) battery
Dimensions(w/h/d)
Approx. 76.3
× 108.4 × 17.6 mm
(31/
8 × 4
3/
8 x
23/
32 inches)
Mass
Approx. 140 g (5.0 oz.)
Supplied accessories
Battery case (1)
Stereo headphones or earphones with
remote control (1)
Battery charger (1)
Rechargeable battery (NC-6WM, 1.2V,
600 mAh, Ni-Cd) (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
Design and specifications subject to
change without notice.
2
WM-EX910
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ................................................................... 5
3.
DISASSEMBLY ......................................................... 6
4.
MECHANICAL ADJUSTMENTS ....................... 11
5.
ELECTRICAL ADJUSTMENTS ......................... 11
6.
DIAGRAMS
6-1. Block Diagram ................................................................ 13
6-2. Printed Wiring Board ...................................................... 14
6-3. Schematic Diagram ......................................................... 15
6-4. IC Pin Function Description ........................................... 16
7.
EXPLODED VIEWS ................................................ 18
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 dam-
aged by heat.
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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.
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 PUB-
LISHED BY SONY.
3
WM-EX910
SECTION 1
SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S and side
T) using the photo reflector (PH701, 702). The PH701, 702 are
mounted on the MAIN board, therefore the idler gear (A) (side S
and side T) cannot be detected with the MAIN board removed. As
a result, the motor (M601) cannot be controlled, causing malfunc-
tion.
Further, the DIRECTION switch (S702) is also mounted on the
MAIN board, and with the board removed, the mechanism posi-
tion cannot be detected and the operation is not changed over.
Therefor, 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) and the plunger
(PM701) 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) Short the lands by solder.
4) Connect the AF oscillator to the TP31 (PH-S), TP32 (PH-T)
and the TP (GND).
5) Supply 1.3 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 (NR) and the DIRECTION switch (S702)
are set to the center position. If not, set the preset state as fol-
low.
2) Move the DIRECTION switch (S702) to the side, which the
slider (NR) is facing.
3) The slider (NR) will move when the regulated power supply
switch is set to OFF once and then set to ON. Move the DI-
RECTION switch (S702) 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 TP31 (PH-S), TP32
(PH-T) and the TP (GND).
3) Move the jog lever (S703) toward [FF] or [REW].
4. PLAY mode
1) Check that the preset state is set.
2) Input the square wave or sine wave to the TP31 (PH-S), TP32
(PH-T) and the TP (GND).
3) Press the jog lever (S703) will move the slider (NR) once to-
wards the side REV and then to the side FWD. Move the DI-
RECTION switch (S702) according to this timing will set the
PLAY mode (side FWD). Press the jog lever (S703) another time
for a second and move the DIRECTION switch (S702) ac-
cording to the movement of the slider (NR) 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 DIRECTION
switch (S702) can be determined from the beep sound.
+
PUSH Y/ x
r
PH702
S703
jog lever
S702
(DIRECTION)
BP701
FWD
R
STOP
r
REV
PH701
>
REW
.
FF
MAIN BOARD
(Side A)
MAIN BOARD (Side B)
connect to the
plunger (PM701)
TP32 (PH-T)
TP (GND)
TP31 (PH-S)
AF oscillator
square wave
(sine wave)
100 Hz, 3.5 dB
connect to the
motor (M601)
battery
terminal 3
battery terminal #
4
WM-EX910
Slider (NR)
Rotation system
Rotation system during PLAY.
Rotation system during FF.
Rotation system during REW.
slider (NR)
side F side R
center
insert flywheel (N)
insert flywheel (R)
reverse pulley
clutch assy (F)
gear (Y)
cam gear
gear (REEL) (side T)
motor pulley
idler gear (A) (side T)
gear (FR)
(FF: left side)
insert flywheel (N)
insert flywheel (R)
reverse pulley
clutch assy (F)
idler gear (B)
gear (Y)
cam gear
gear (REEL) (side T)
gear (REEL) (side S)
motor pulley
idler gear (A) (side T)
idler gear (A) (side S)
gear (NR)
(FWD : left side/
REV : right side)
insert flywheel (N)
insert flywheel (R)
reverse pulley
clutch assy (F)
gear (Y)
cam gear
gear (REEL)
(side S)
motor pulley
idler gear (A)
(side S)
gear (FR)
(REW: right side)
5
WM-EX910
SECTION 2
GENERAL
This section is extracted from
instruction manual.
A
UK, Australian, and Hong Kong
model
Modèle pour le Royaume-Unie,
l'Australie et Hong-Kong
Modell für GB, Australien und
Hongkong
Other models
Autres modèles
Andere Modelle
1
2
3
4
B
VOL
AVLS
OPEN
C
D
Y · x
FF(+)
REW ()
Jog lever
Levier Jog
Jog-Hebel
FWD
REV
HOLD
Plug in firmly.
Branchez fermement.
Fest einstecken.
Hold shutter
Cache de
verrouillage
Schutzschieber
Jog lever
Levier Jog
Jog-Hebel
FF
REW
E
HOLD
MODE
SOUND
F
G
OPEN
Hold shutter
Cache de
verrouillage
Schutzschieber
VOL
AVLS