JVC KW-XC404 Service Manual page 46

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5.5 Signal processing section 3 7 63 1515 0
YES
Is the sound output from
both channels (L, R)?
NO
YES
No sound from either
channel.
NO
Compare the L-ch and
R-ch to locate the
defective point.
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Normal
YES
Is 9V present at pin 40
of IC151?
NO
YES Check the connections
Is 9V present at pin 10
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
IC572 during playback?
NO
Check IC572 and its
peripheral circuits.
between pin 40 of IC151
and pin 10 of IC901.
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
Is the audio signal output
at pin 36 and pin 37 of
IC151 during playback?
NO
Check IC151 and its
peripheral circuits.
YES
Check the power
amplifier IC181.
0 5 8 2 9 9 4 2 8
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9 9
9 9