Sharp VC-90ET

MECHANISM TROUBLESHOOTING
1. FF/REW FAILURE (NO TAPE WINDING)
Remove cassette
controller, turn
pepe on and press
F key.
Disconnect and
reconnect FFC.
(AM-MA, MC, MF)
Is
brake
shifter
at
ts
12V
applied
at
FF (REW) position?
Is brake solenoid
attracted ? solenoid terminal
(check with tester) ?
YES
Areidiergearand [yo
reel disk FF gear in
mesh?
Check for broken
solenoid lead (turn
power off,
disconnect FFC and
check with tester).
Clean solenoid
Brake shifter i
i while attracted, or
deformed. Replace
replace it.
YES
roken
lead)
Replace idler
assembly.
Are AT 12V and PC [NO
5V applied ?
Is capsten OD
f Reptace solenoid.
MOTOR turning?
YES YES
Disconnect and
reconnect FFC,
(AM-MA, MC, MF)
ls FF brake torque
between 10 and
20 g-cm?
Replace capstan
DD. MOTOR.
Replace FF brake
assembly.
Tape travel is
presumabl
overloaded due to
damage on tape.
Damaged tape is
to be out of use.
2. REC/PLAY FAILURE (MODE RELEASE)
Remove cassette
controller, turn
poe on and press
B key.
Is brake shifter at
PLAY (REC)
position?
Are idler gear and
reel disk PB gearin ne
mesh?
YES
Is take-up reel disk [NO
pulse outputted ?
YES
Check SYSCON-
SERVO PWB. Reel
pulse AT pin G9
of IC801H-SW-
Pulse AT pin @ of
1C801.
LOOHS F18NOUL
Brake shifter is
deformed.
Replace.
is brake shifter at
PLAY position ?
Replace relay
shifter.
Replace idler
assembly.
Disconnect and
reconnect FFC.
(AM-MA, MC, MF)
Is capsten DD
MOTOR turning ?
NO; AreAT12V and PC |NO
5V applied ?
YES > YES
Replace capstan
Is ATSV applied at | NO DD. MOTOR.
reel PWB?
Disconnect and
reconnect FFC.
Replace reel
sensor.
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