Sanyo HV-DX4EV Service Manual page 7

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