Harman Kardon CDR20 Service Manual page 31

CDR20
Disc recognition is abnormal
Is there
CDR/RW signal input
normally?(IC601 pin 33)
YES
Go to "Track Servo is unstable"
RF output is abnormal
Is there
PICK UP(A,B,C,D) output
normally? (CN401 pin 8,9,
14,15)
YES
Is RRF signal
output normal?(IC401 pin 86)
•First Recognition try : Over 1.7 Vpp
•Second Recognition try :
Over 0.5 Vpp
YES
OK
Is there
NO
RECD1, RECD2 signal
output normally? (IC401 pin
48,49)
YES
Replace IC701 (MICOM)
NO
•Check the PICK UP FFC.
•Replace the PICK UP
•Check the connection between
NO
CN401 and IC401.
•Replace the IC401(CXA2551R).
31
harman/kardon
NO
Go to "RF output is abnormal"
NO
Go to "Laser is abnormal"