WM-EX651
3
SECTION 1
SERVICE NOTE
[Service Mode]
The service mode enables to operate the mechanism of WM-EX651
while the MAIN board is opened.
Rotation of the idler gear (A) (S side) is detected using the photo-
reflector (PH701) in the WM-EX651. PH701 is located on the
MAIN board, therefore the rotation of the idler gear (A) (S side)
cannot be detected by PH701 when the MAIN board is removed.
As a result, the motor cannot be controlled and cannot run correctly.
To repair the machine after the MAIN board is removed while the
main power is turned on, follow the procedures as described below.
1. Setting
1)
Remove the cabinets referring to section “3. DISASSEMBLY”.
Open the MAIN board.
2)
Connect the motor (M901) and the plunger solenoid (PM901)
to the MAIN board using the jumper wires. When the
extension jig (1-769-143-11) (10 wires as a set) is used, they
can be connected easily.
3)
Short the TAPE DETECT switch (S901-1) and the ATS switch
(S901-2).
4)
Connect an AF oscillator to TP53 (P. IN) and TP14 (GND).
5)
Connect DC 1.3 V from external regulated power supply to
3
and
#
terminals of the battery.
2. PRE-SET status
The PLAY, FF and REW modes can be entered only from the PRE-
SET status.
1)
Check that the slider (NR) is in the center position (S701)(See
page 4 for illustration), and the FWD/REV switch (S701) is
also in the center position. When these switches are not in the
center position, set them to the PRE-SET status as follows.
2)
Move the FWD/REV switch (S701) to the same position as
the slider (NR) is set.
3)
The slider (NR) can be moved when the main power of the
regulated power supply is turned OFF once then back ON.
Move the FWD/REV switch (S701) to the center position in
synchronism with the timing when the slider (NR) is moved.
3. FF, REW modes
1)
Check that the PRE-SET status is set.
2)
Connect square wave or sine wave to TP53 (P. IN) and TP14
(GND). (See illustration below)
3)
Press the
x
switch (S703) to enter the STOP mode.
4)
Press the FF/CUE switch (S705) or REW/REVIEW switch
(S706).
4. PLAY mode
1)
Check that the PRE-SET status is set.
2)
Connect square wave or sine wave to TP53 (P. IN) and TP14
(GND). (See illustration below)
3)
Press the
x
switch (S703) to enter the stop mode.
4)
When the
nN
switch (S704) of the MAIN board is pressed,
the slider (N/R) moves once to the F side then moves to the R
side. When the FWD/REV switch (S701) is pressed in the
synchronism with the above timing, the machine can enter
the PLAY (R side) mode. Press the
nN
switch (S704)
again, and move the FWD/REV switch (S701) in the
synchronism with the motion of slider (NR). It enables the
machine to enter into the PLAY (F side) mode. (See page 4
for illustration)
Note 1:
When you fail to enter the PLAY mode, re-start from step 2)
PRE-SET status.
Note 2:
Regarding the
nN
(S704),
x
(S703), FF/CUE (S705) and
REW/REVIEW (S706) switches, use these switches of the
remote control unit as much as possible.
Note 3:
If a headphones are used, the beep sound shows the timing of the
FWD/REV switch (S701).
– MAIN BOARD
(SIDE B) —
TAPE DETECT
SWITCH
(S901-1)
ATS
SWITCH
(S901-2)
Plunger (PM901)
Short
AF OSC
Battery
terminal
#
Battery terminal
3
TP14
(GND)
S701
FWD
←
STOP
→
REV
x
TP53
(P.IN)
PH701
M901
Square-wave
(sine wave)
10 Hz, -3.5 dB
M
