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TROUBLESHOOTING
3. VIDEO circuit
A. EE screen doesnÕt appear
EE MODE Picture NG
YES
NO
Is Video signal input at
Check IF and SCART JACK.
IC301 pin#48,50,52,54?
YES
NO
Is 5V supplied at
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 #58,66,67
YES
NO
Check IC301
Is signal output from pin#65 of
pin#62 Q-V Sync.
IC301?
YES
NO
Is signal input into pin#13
Check PCB Pattern.
of P100?
YES
NO
Is signal output from pin#1
Check MPEG circuit.
of P100?
YES
NO
Is signal input at IC301
Check PCB Pattern.
pin#56?
YES
Is signal output at IC301
NO
pin#61?
Check IC301.
YES
Check PCB Pattern & LINE
Check RF Output.
out.
12
B. Playback picture doesnÕt appear
1) No VCR Playback Picture
PB video signal missing.
YES
NO
Is Envelope output from IC301
Is 5V supplied at IC301 pin#91?
pin#79?
YES
Is SW Pulse input at IC301
pin#70?
YES
Is Y SIGNAL output at IC301
Is 5V obtained at IC301 pin#24,
NO
pin#46?
42,55,72,91?
Check and Replace IC301.
YES
Does X301(4.43MHz)
NO
oscillate?
Is Y SIGNAL input at IC301
NO
Check PATTERN
pin#43?
YES
Is VIDEO SIGNAL output at IC301
NO
Check and replace IC301.
pin#65?
YES
Same as EE MODE check.
TROUBLESHOOTING
NO
Check POWER 5V.
NO
Check IC501 pin#18.
YES
Clean head or Replace head.
NO
Check POWER 5V.
YES
YES
Check PATTERN
NO
Replace X301.
13
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