Aiwa VX-G142 Service Manual page 51

PLAYBACK PICTURE NOISY
(EVEN AFTER CLEANING HEADS)
Is FM signal at TP4002
more than 200mVp-p?
Yes
Is there FM signal at pin 11 of
IC4001 140mVp-p?
Yes
Is VIDEO waveform at
pin 6 of IC4001 over
500mVp-p and are
there any noise?
Yes
Is VIDEO waveform at
pin 37 of IC4001 400mVp-p
are there CHROMA signal
at pins 31 of IC4001 200mVp-p
and are there any noises?
Yes
Is VIDEO waveform at
pin 9 of IC4002 600mVp-p,
are there CHROMA signal
at pin 16 of IC4002 300mVp-p
and are there any noises?
Yes
Check J4501
TROUBLESHOOTING GUIDE
No
No
No
No
No
E-20
Replace CYLINDER MOTOR.
Check Q4001,Q4016,Q4004
and the peripheral circuit.
Check pins 6 and 8 of IC4002
and the peripheral circuit.
Replace IC4001.
Replace IC4002.