Philips CDR779 Service Manual page 54

GB 54 7. CDR779
CD MODULE PLAYBACK
PRESS <PLAY>
AUDIO?
YES
DISTORTION?
NO
AUDIO
CD OUT PCB?
YES
PLAYBACK CD
MODULE OK
Faultfinding trees
•
DAC 7309
TESTPOINTS 20, 21, 22 : I 2 S AT INPUT OF DAC 7309
⇒
⇒
CHECK POWER SUPPLY PINS 4, 13
NO
⇒
CHECK CLK11 AT PIN 6 : 11.2896MHz
⇒
PIN 11 : MUTE HIGH?
⇒
TESTPOINTS 23, 24 : ANALOG OUTPUT?
⇒
REPLACE DAC 7309
•
OPAMP 7120
⇒
TESTPOINTS 23, 24 : ANALOG OUTPUT?
⇒
POWER SUPPLY: PIN 8→12V
⇒
REPLACE OPAMP 7120
YES
•
DAC 7309
•
OPAMP 7120
NO
•
FLEX TO CDR MAINBOARD
•
FLEX TO CD OUT BOARD
•
CHECK I/O BOARD, CD OUT BOARD
Figure 7-6
CL 96532086_031.eps
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