JVC KD-AR260 Service Manual page 26

5.5 Signal proccessing section
Is the sound output from
both channels (L, R)?
Normal
1-26 (No.MA111)
NO
No sound from either
YES
Is 9V present at IC301 pin
Is the audio signal
(including sampling output
components) output to
IC151 pins 1 and 7 during
Is the audio signal output
at IC301 pins 3 and 30
during playback?
Check the muting circuit.
NO
channel.
YES
NO
31?
YES
NO
playback?
YES
NO
YES
Compare the L-ch and
R-ch to locate the
defctive point.
Check the viciniyt of the
Q321 audio power
supply.
Check IC151 and its
peripheral circuits.
Check IC301 and its
peripheral circuits.