JVC KD-SHX751 Service Manual page 30

5.5 Signal processing section
Is the sound output from
both channels (L, R)?
YES
Normal
1-30 (No.MA163)
NO
No sound from either
channel.
YES
Is 9V present at IC165
/IC265 pin 16?
YES
Is 5V present at IC365
pina 2, 3, 9 and 10?
YES
Is 7V present at IC951
pina 3, 5, 7, 9, 17, 19
21 and 23?
YES
Check the speaker
connector and its
connection.
Compare the L-ch and
NO
R-ch to locate the
defective point.
NO
Is 9V present at IC901
pin 10?
YES
Check the connection
between IC901 pin10
and IC165/IC265 pin
16.
NO
Check the vicinity of
IC365.
NO
Check the power amp.
IC951.
NO
Check IC901 and its
peripheral circuits.