Hitachi GCR-8480B User Manual page 11

G. During Audio CD play, LED flickers, but Speaker is silent.
Does Audio signal appear
at IC501 pin ,
87
(Refer to Fig. G-1.)
YES
Does "H" signal appear at
IC501 pin 113 ?
YES
Does Audio signal appear
at IC602 pin ,
1
YES
Are L-ch, R-ch signals
appear at JK701 and
Audio Line out connector
each?
YES
G-1
30
NO
Replace IC501.
?
90
NO
Check the IC501 pin
and then replace IC501?
NO
Is the voltage of IC602
? pin
7
6
NO
Check JK701 and
L701,L703.
113
NO
2.5V?
YES
Check C87.
Replace IC602.