Service Note - Sony WM-FX700 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 (M601) cannot
be controlled, causing malfunction.
Further, the DIRECTION switch (S801) is also mounted on the
MAIN board, and with the board removed, the mechanism position
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
(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 (S501-1) terminals and the
ATS switch (S501-2) terminals.
(4) Connect the AF oscillator to the TP36 (P. IN) and the BATT#
terminal.
(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 (S801)
are set to the center position. If not, set the preset state as follow.
(2) Move the DIRECTION switch (S801) 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
DIRECTION switch (S801) according to this timing and set to
the center position.
TAPE DETECT
SWITCH ATS SWITCH
(S501-1) (S501-2)
Short
SECTION 1

SERVICE NOTE

3. FF, REW modes
(1) Check that the preset state is set.
(2) Input the square wave or sine wave to the TP36 (P. IN) and the
BATT # terminal.
(3) Press the x button (S703) to set the STOP mode.
(4) Press the FF AMS button (S708) or the REW AMS
button(S707).
4. PLAY mode
(1) Check that the preset state is set.
(2) Input the square wave or sine wave to the TP36 (P. IN) and the
BATT # terminal.
(3) Press the x button (S703) to set the STOP mode.
(4) Press the n N REPEAT button (S709) will move the slider
(NR) once towards the side R and then to the side F.
Move the DIRECTION switch (S801) according to this timing
will set the PLAY mode (side F). Press the n N REPEAT
button (S709) another time and move the DIRECTION switch
(S801) according to the movement of the slider (NR) will set
the PLAY (R mode).
Note 1: If the above fails, perform from preset again.
Note 2: Use the n N REPEAT (S709), x (S703), FF AMS
Note 3: When using headphones, the timing for move the
– MAIN BOARD (SIDE B) —
Plunger (PM901)
Battery terminal #
ENTER
(S702)
Y REPEAT
(S709)
SET
(S705)
MENU
RADIO ON/
(S706)
BAND
(S704)
FWD ← STOP → REV
WM-FX700/FX890/FX900
(S708), and REW AMS (S707) buttons on the remote
controller as much as possible. If no remote controller, do
not touch the buttons with your hands, but using a stick
with a round tip.
DIRECTION switch (S801) can be determined from the
beep sound.
OSC
Sine wave
10 Hz, -3.5 dB
FF/PRESET+
(S708)
R710
(Side A)
REW/PRESET–
(S707)
(S801)
x RADIO OFF
(S703)
M
M601
3