JVC KD-G311 Service Manual page 27

5.5 Signal processing section
Is the sound output from
both channels (L, R)?
NO
No sound from either
channel.
YES
Normal
Is 9V present at IC161
pin 32?
Is the audio signal
(including sampling
output components)
output to IC581 pins 1
and 7 during playback?
Is the audio signal
output at IC161 pins 15
and 18 during playback?
Check the power amp.
IC301.
Compare the L-ch and
NO
R-ch to locate the
defective point.
YES
Check the vicinity of the
NO
IC901 audio power
supply.
YES
NO
Check IC581 and its
peripheral circuits.
YES
NO
Check IC161 and its
peripheral circuits.
YES
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