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This set detects the rotation of the idler gear (A) (side S) using the
photo reflector (PH701). The PH701 is mounted on the MAIN
board, therefore the idler gear (A) (side S) cannot be detected with
the MAIN board removed. As a result, the motor (M601) cannot
be controlled, causing malfunction.
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 (BP1) by solder.
4) Connect the AF oscillator to the TP31 (PH-S) and the TP10
(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 (NRA) and the DIRECTION switch
(S702) are set to the center position. If not, set the preset state
as follow.
2) Move the DIRECTION switch (S702) to the side, which the
slider (NRA) is facing.
3) The slider (NRA) 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 (Component Side) –
PUSH – Y / x
>
FF
PH701
SECTION 1
SERVICING NOTES
r
.
REW
S703
jog lever
FWD
R
STOP
r
REV
S702
(DIRECTION)
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) and
the TP10 (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) and
the TP10 (GND).
3) Press the jog lever (S703) will move the slider (NRA) once
towards the side REV and then to the side FWD. Move the
DIRECTION 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)
according to the movement of the slider (NRA) 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.
– MAIN Board (Conductor Side) –
connect to the
plunger (PM701)
battery terminal #
TP31 (PH-S)
TP10 (GND)
battery terminal #
WM-EX921
[FF]
[REW]
or
.
BP
AF oscillator
+
–
square wave
(sine wave)
100 Hz, –3.5 dB
connect to the
motor (M601)
battery
terminal 3
3
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