Harman Kardon CDR20 Service Manual page 35

CDR20
BETA Measurement circuit ceck
After inserting Test Dise(TCD-784),
start playing.
IC401 Pin 86(RRF):3+/-1.0V?
YES
RRFIN:2+/0.7V?
(IC401 PIN85)
YES
IC405 Pin 10(CDR/RWS)="H"?
YES
IC701 Pin 78(RFBETA):
2+/-1.0V?
YES
K
NO
•Check the connection of IC401 pin 86.
•Check and replace the IC401
(CXA2551R).
•Check the connection of IC407.
NO
•Check and replace the IC407.
•Check the connection of IC701 pin 20.
NO
•Check and replace the IC701(MICOM).
NO
Is BETA signal nomal?
(IC405 pin 14)
YES
Check the replace the IC405(BU4052)
35
harman/kardon
NO
•Check the connection of IC401 pin 82.
•Check and replace the IC401.