NAD C660 Service Manual page 16

Focus Actuator operation
is abnormal
Is there
Focus Search control signal
input? (IC203 pin 3)
(FAO)
YES
Is there Focus Search
drive voltage output?
(IC203 pin 13,14)
YES
•Check the connection of PN101 Pin 1,4.
•Check the Pick-up Connector.
Replace the Pick-Up.
Spindle control is abnormal 1
Does FOCUS Servo
operate normally?
YES
Is there
RFAC(EFM)signal input?
(IC301 pin 163)
YES
Go to "Spindle operation is
abnormal"
•Check the connection of IC301 pin207.
NO
•Check the communication line between
IC301 and IC320
•Replace the IC301 (OTI-9790)
NO
Is Act_Mute signal "L"?
(IC203 pin 9)
YES
Replace the IC203 (BA5983).
NO
Go to "Focus Servo is unstable"
NO
Is there a output normally?
(IC108 pin 71, 72)
YES
Replace the IC103 (EL2245).
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•Check the connection of IC320
NO
pin26.
•Replace the IC320 (MICOM)
NO
Replace the IC108 (CXA2551R).