Sanyo HV-DX4EV, Service Manual

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11
TROUBLESHOOTING
10
TROUBLESHOOTING
F. DRUM Motor stops
G. CAPSTAN doesn t rotate
CAPSTAN doesn t rotate.
Is EVER 14V voltage obtained
at P501 pin#2?
YES
NO
NO
NO
YES
YES
Is Capstan PWM fit to
IC501 pin#77?
Is 3.2V voltage obtained
at P501 pin#5?
Is 2.7V voltage obtained
at P501 pin#9?
Check P501 Connector and
Capstan Motor.
Check EVER 14V.
(Q850)
Check Capstan FG
(IC 501 pin# 87).
Check
R541,R540,R539,R538,C518
Check R537,R536,C521
DRUM Motor stops.
Is 14V voltage obtained at P501
pin#8?
YES
NO
NO
NO
YES
YES
Is DRUM PWM fit to IC 501
pin#76?
Is 2.6V voltage obtained at
P501 pin#12?
Check Capstan Motor and
DRUM Motor.
Check EVER 14V
(Q850).
Check DRUM PG/FG
(IC 501 pin# 90).
Check R534,R535,C519,C520.
NO
3. VIDEO circuit
A. EE screen doesn t appear
EE MODE Picture NG
Is Video signal input at
IC301 pin#48,50,52,54?
Is 5V supplied at
pin#42,55,72,91of IC301?
Is C.S, DATA, CLOCK signal
input pin#67,68,69 of IC301?
Check IF and LINE IN JACK.
Check POWER circuit.
Check IC501
pin #58,71,72.
NO
YES
YES
NO
NO
YES
Is signal output from pin#65 of
IC301?
YES
NO
Check IC301
pin#62 Q-V Sync.
Is signal input into pin#50
of IC501?
YES
NO
Check PCB Pattern.
Is signal output from
pin#52 of IC501?
YES
NO
Is 5V supplied to pin#53, 98,
99 of IC501?
Is signal output at IC301
pin#61?
YES
NO
Check PCB Pattern
Q309, Q310.
Check IC 501
YES
Check POWER circuit.
NO
Is signal input at IC301
pin#56?
Check RF Output.
Check PCB Pattern & LINE
out.
YES
YES
Check IC301.
NO