(No.YA712<Rev.002>)1-21
5.3 Audio Signal Section
Check SP801,SP802 and their periphery circuit,
and service it if defective.
Are the audio(L/R) signals inputted to the Pin
(1, 44)
of IC801?
Are the audio(L/R) si
gnals inputted to the Pin(3, 5)
of IC871?
Ye s
Ye s
Audio is not outputted normally.(Audio input)
FLOW CHART NO.1
Are the audio(L/R) signals inputted to Pin(2, 15)
of IC771?
Check the line between Pin(2, 15) of IC771 and
input terminal(JK753, JK754), and service it if
defective.
Ye s
No
No
No
Are the audio(L/R) signals outputte
d to the Pin(1, 2)
of CN801 and CN802?
Are the audio(L/R) signals outputte
d to the audio
output ter
minal?
Check IC801 and their periphery circuit, and
service it if def
ective.
CN802: SP(L)
CN801: SP(R)
JK871: AUDIO(L)-OUT
JK872: AUDIO(R)-OUT
No
Ye s
Are the audio(L/R) si
gnals inputted to each pin of
CN301?
Replace Digital Main
PWB Unit.
Check the line between Pin(6, 8) of CN301 and
Pin(1, 44) of IC801, and
service it if de
fective.
Check the line betw
een Pin(2, 4) of CN301 and
Pin(3, 5) of IC871, and service it if de
fective.
No
Check the line betw
een Pin(1,
7) of IC871 and audio
output terminal(JK871, JK872), and service it if
defective.
Pin(6) :
Pin(8) :
Pin(2) :
Pin(4) :
AMP(L)-OUT
AMP(R)-OUT
AUDIO(L)-OUT
AUDIO(R)-OUT
No
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