JVC KW-XC407

1-18 (No.MA235)
5.5 Signal processing section
No sound from either
channel.
Is 9V present at pin 40
of IC151?
Compare the L-ch and
R-ch to locate the
defective point.
Is the sound output from
both channels (L, R)?
YES
NO
Is the audio signal
(including sampling
output components)
output to pins 1 and 7 of
IC572 during playback?
Is the audio signal output
at pin 36 and pin 37 of
IC151 during playback?
Normal
YES
NO
YES YES
NO
Check IC572 and its
peripheral circuits.
NO
Check IC151 and its
peripheral circuits.
YES
Check the power
amplifier IC181.
NO
Is 9V present at pin 10
of IC901?
YES
Check the connections
between pin 40 of IC151
and pin 10 of IC901.
NO
Check IC901 and its
peripheral circuits.