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A. b. AV1 E-E
No sound in AV1 E-E
mode.
YES
Is there Audio IC252 pin#2,15?
YES
Is RF Audio signal output at
IC252 pin#3,13?
YES
C at Q904 is L or H?
L
Check Output JACK.
NO
NO
IC601 pin#27
H
Check
H
A.Mute is L or
IC601.
H?
L
Check
Q904,Q905,R9
37,R938,R939
Check Input JACK.
Is 12V obtained at IC252
pin 16?
YES
IC601 pin#31 is H,
pin#21is L?
YES
Is about 8V obtained at
IC252 pin#9?
Is about 3.5V obtained
at IC252 pin #10?
YES
Replace IC252.
17
TROUBLESHOOTING
NO
Check POWER circuit.
NO
Check IC601.
NO
Check R646, R647, R911,
R913.
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