JVC KD-G120 Service Manual page 19

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5.2.5 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 32
of IC171?
NO
Is 9V present at pin 13
of IC901?
NO
Check IC901 and its
peripheral circuits.
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2 9
8
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.
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
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.
Check the power
amplifier IC301.
0 5 8 2 9 9 4 2 8
m
(No.MA233)1-19
9 9
YES
9 9