NAD C660 Service Manual page 18

Disc recognition is abnormal
Is
CDR/RW signal input
normal? (IC301 pin 33)
YES
Go to "Track Servo is unstable"
RF output is abnormal
Is
PICK UP(A,B,C,D) output
normal? (PN101 pin 8,9,
14,15)
YES
Is RRF signal
output normal? (IC108 pin 86)
•First Recognition try : Over 1.7 Vpp
•Second Recognition try :
Over 0.5 Vpp
YES
OK
Is
NO
RECD1, RECD2 signal
output normal? (IC108 pin
80,81)
YES
Replace IC320 (MICOM)
NO
•Check the PICK UP FFC.
•Replace the PICK UP
•Check the connection between
NO
PN101 and IC108.
•Replace the IC108 (CXA2551R).
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NO
Go to "RF output is abnormal"
NO
Go to "Laser is abnormal"