Dell GCR-8481B Service Manual page 12

G. During Audio CD play, LED flickers, but Speaker is silent.
Does PWM signal appear at
IC501 pin , , ,
166 167 174 175
(Refer to Fig. G-1.)
YES
Does Audio signal appear
at IC601 pin , ?
3 12
(Refer to Fig. G-2.)
YES
Does "H" signal appear at
IC501 pin ?
108
YES
Does Audio signal appear
at IC701 pin , ?
1 7
YES
Are L-ch, R-ch signals
appear at JK701 and
Audio Line out connector
each?
YES
G-1
NO
Replace IC501.
?
NO
Is the voltage of IC601
pin and
9 8
Replace IC601.
NO
Check the IC501 pin
and then replace IC501.
NO
Is the voltage of IC701
pin 2.5V?
6
Check C702.
NO
Check JK701 and
L701,L703.
NO
Check the R602.
2.5V?
YES
108
NO
YES
Replace IC701.
29