Sharp VT-3448X, Service Manual

Page: 59 / 144

VCR SOUND TROUBLESHOOTING
No Sound.
FLOWCHART NO.
No E-E signal.
.
Is there an Audio
signal at pin
of
NO
?
Check parts around the
audio inputs jack, and
around the audio
output circuit in TV tuner.
I
I
YES
Is there supply
voltage of feed to
pin of ?
YES
Are there the serial
date and clock
signal at pins
and
?
YES
Check between pins
NO
and of and all
the way to pins and
of
Is voltage of pins and
of normal ?
YES
Is there level at pin
of
NO
Check A-MUTE
I
line.
YES
Replace
No record.
1
I I
YES YES
Is there a signal at pin
of ?
Is the operate of
normally ?
YES YES
Replace
I
I I
Is there supply voltage of NO
feed to at pin of
Check PC line.
?
Is there a signal
at pin
Check harness
of connector AA.
and head.
NO
No playback.
Is there an Audio signal at
pin
of ?
YES
Is there level at
pin of ?
Check BIAS
line.
YES
YES
I
1
I
Clean A/C head.
I
1
YES
Check line between pin of and the audio
speaker output.
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