Servicing Notes - Sony WM-FX522 Service Manual

This set detects the rotation of the idler gear (A) (side S) using the
PH701 (photo reflector). 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 (M901) cannot
be controlled, causing malfunction.
Further, the DIRECTION switch (S703) 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 (M901) and the
plunger (PM901) 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 TAPE DETECT switch (S901-1) terminals and the
ATS switch (S901-2) terminals.
(4) Connect the AF oscillator to the TP40 (PHOTO IN) and the
TP2 (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
(S1) are set to the center position. If not, set the preset state
as follow.
(2) Move the DIRECTION switch (S703) to the side, which the
slider (NRA) is facing.
(3) The slider (NRA) will move when the regulated power sup-
ply switch is set to OFF once and then set to ON. Move the
DIRECTION switch (S703) according to this timing and set
to the center position.
– MAIN BOARD –
square wave
(sine wave)
10 Hz, – 3.5 dB
TP2
(GND)
TP40
(PHOTO IN)
PH701
SECTION 1

SERVICING NOTES

AF oscillator
+
–
S703
DIRECTION
FWD
R
STOP
r
REV
3. FF, REW modes
(1) Check that the preset state is set.
(2) Input the square wave or sine wave to the TP40 (PHOTO IN)
and the TP2 (GND).
[RADIO OFF ]
(3) Press the
mode.
[FF AMS]
(4) Press the button (S707) or the
ton (S708).
4. PLAY mode
(1) Check that the preset state is set.
(2) Input the square wave or sine wave to the TP40 (PHOTO IN)
and the TP2 (GND).
[RADIO OFF ]
(3) Press the
mode.
[ REPEAT]
(4) Press the
Y
(NRA) once towards the side R and then to the side F. Move
the DIRECTION switch (S703) according to this timing will
set the PLAY mode (side F). Press the
(S710) another time and move the DIRECTION switch
(S703) according to the movement of the slider (NRA) will
set the PLAY (R mode).
Note 1: If the above fails, perform from preset again.
[ REPEAT]
Note 2: Use the
(S710)
Y
[REW AMS]
(S707), and
ler as much as possible. If no remote controller, do not touch the
buttons with your hands, but using a stick with a round tip.
Note 3: When using headphones, the timing for move the DIRECTION
switch (S703) can be determined from the beep sound.
TAPE DETECT
REPEAT
(S710)
REW AMS
(S708)
RADIO OFF
(S709)
connect to the
motor (M901)
WM-FX522
button (S709) to set the STOP
x
[REW AMS]
x button (S709) to set the STOP
button (S710) will move the slider
[ REPEAT]
Y button
, [RADIO OFF ] [FF AMS]
x (S709),
(S708) buttons on the remote control-
(S901-1)
ATS
(S901-2)
FF AMS
(S707)
connect to the plunger
(PM901)
battery
terminal 3
battery
terminal #
but-
3