JVC KD-G120 Service Manual page 19

5.2.5 Signal processing section
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.
YES
Normal
YES
Is 9V present at pin 32
of IC171?
NO
Is 9V present at pin 13
of IC901?
NO
Check IC901 and its
peripheral circuits.
Is the audio signal
(including sampling
YES
output components)
output to pins 1 and 7 of
IC581 during playback?
NO
Check IC581 and its
peripheral circuits.
YES Check the connections
between pin 32 of IC171
and pin 13 of IC901.
Is the audio signal output
YES
at pin 14,pin 15, pin 18
and pin 19 of IC171 during
playback?
NO
Check IC171 and its
peripheral circuits.
YES
Check the power
amplifier IC301.
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