JVC KD-G120 Service Manual page 16

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5.1.5 Signal processing section 3 7 63 1515 0
Is the sound output from
both channels (L, R)?
NO
No sound from either
channel.
NO
Compare the L-ch and
R-ch to locate the
defective point.
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YES
Normal
YES
Is 9V present at pin 26
of IC301?
NO
Is 9V present at pin 10
of IC901?
NO
Check IC901 and its
peripheral circuits.
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Is the audio signal
(including sampling
YES
output components)
output to pins 1 and 7 of
IC151 during playback?
NO
Check IC151 and its
peripheral circuits.
YES Check the connections
between pin 26 of IC301
and pin 10 of IC901.
Q Q
3 6 7 1 3
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.
2 9 9 4 2 8
Is the audio signal output
YES
at pin 22 and pin 25 of
IC301 during playback?
NO
Check IC301 and its
peripheral circuits.
Check the power
amplifier IC321.
1 5 0 5 8 2 9 9 4
m
co
9 9
YES
2 8 9 9