Daewoo SD-8100, Service Manual

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22
TROUBLESHOOTING
Is playback audio signal output
at IC252 pin#3,13?
Is 12V obtained at IC252
pin#16?
Replace IC252.
NO
IC601 pin#31 is L, pin#21 is
L?
Check IC601.
NO
Is there playback audio signal
at IC251 pin#16,17?
Replace IC251.
NO
Is there Audio at IC252
pin#1,12?
Check signal flow circuit
from IC251 to IC252.
NO
Check POWER circuit.
NO
YES
YES
C at Q904 is L or H?
Check MUTE circuit.
H
L
YES
YES
YES
Check OutputJACK.
B. No Hi-Fi playback audio (PLAY MODE)
Is there A.SW signal at IC251
pin#41?
Check A.SW at IC601 pin#19.
NO
Is about 3.5V obtained at
IC252 pin#9, 10?
Check R646, R647, R911,
R913
NO
YES