Video Circuit Troubles; Ee Screen Doesn't Appear; Playback Picture Doesn't Appear - Sanyo DVR-V100E Service Manual

TROUBLESHOOTING
3. VIDEO circuit
A. EE screen doesn t appear
EE MODE Picture NG
YES
NO
Is Video signal input at
Check IF and SCART 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 #58,66,67
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.
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B. Playback picture doesn t appear
1) No VCR Playback Picture
PB video signal missing.
YES
Is Envelope output from IC301 NO
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?
YES
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
Check PATTERN
NO
Replace X301.
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