Servicing Notes - Sony WALKMAN WM-EX910 Service Manual

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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.
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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.
– MAIN BOARD
(Side A) –
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SERVICING NOTES

PUSH – Y / x
r
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REW FF
S703
jog lever
PH702
PH701 FWD
R
STOP
r
REV
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S702
y
(DIRECTION)
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SECTION 1
2 9
8
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
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.
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– MAIN BOARD (Side B) –
TP (GND)
co
.
battery terminal #
– 3 –
9 4 2 8
[FF] [REW]
or
0 5 8 2 9 9 4 2 8
connect to the
plunger (PM701)
AF oscillator
TP32 (PH-T)
TP31 (PH-S)
square wave
(sine wave)
100 Hz, –3.5 dB
m
connect to the
motor (M601)
battery
terminal 3
9 9
.
9 9
BP701
+
–