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R15AAC/AAU (vs15)
11. Audio no signal output
Check the audio signal input from the audio
source.
OK
NG
Failure Point
1) No audio signal from the audio source.
2) Audio cable is failure.
Check audio signal input of the I312
TDA7496SA pin5 .
Failure Point
1) FB322, FB323, R372, R373 are open. C385
C387, C391, C392 are short.
2) Audio output wire is disconnected from the
interface board P309 and key function board
P601.
3) Printed wire broke between P601 and J600 of
the function board.
NG
OK
Check I312 pin13 have 12V power.
NG
OK
Check I3132 pin2 is 2V power
Next Page
NG
OK
Failure Point
1) FB303 is open.
2) +12V of power board output
failure
Check Q302 pin2 is TTL high level
NG
OK
Failure Point
1) R382 is open.
2) I307 failure
Check I313 pin1 is TTL low level
NG
OK
Failure Point
1) R560, R387, R381 are open.
Failure Point
1) I313 failure.
2) L301 is open.
