NAD C660 Service Manual page 17

Spindle control is abnormal 2
(CD-RW Disc)
Is there
RRF signal input?
(IC103 pin 3)
YES
Is there
RFDC signal input?
(IC108 pin 85)
YES
Does Tracking
Servo operate normally?
YES
Go to "Disc recognition is abnormal"
Spindle control is abnormal 3
Is there WBLIN signal
input? (IC301 pin 132)
YES
Is there DMO signal
output? (IC301 pin 2)
YES
Go to "Spindle operation is
abnormal"
NO
Go to "RF output is abnormal"
NO
Replace the IC103 (EL2245).
NO
Go to "Track servo is unstable"
NO
Is there ATFM signal
output? (IC108 pin 25)
YES
Replace the IC108 (CXA2551R).
NO
Replace the IC301 (OTI-9790).
-17-
NO
Go to "RF output is abnormal"