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TROUBLESHOOTING GUIDE
PLAYBACK PICTURE IS NOISY
(EVEN AFTER CLEANING HEADS)
Yes
No
Is FM signal at TP4001
more than 200mVp-p ?
Check HEAD AMP and interchange
adjustments.
No
Yes
Is FM signal at pin 72 of
IC4001 200mVp-p ?
Yes
No
No
Yes
Replace IC4001.
Check Q4011, Q4212 and peripheral
circuit.
Check pin 74 of IC4001 and
peripheral circuit.
Replace IC4001.
Is VIDEO waveform at pins
20 and 21 of IC4001 about
450mVp-p, and are there
any noises ?
Is VIDEO waveform at pin
29 of IC4001 2V, and are
there any noises ?
E-11