NAD C660 Service Manual page 15

Spindle operation is abnormal.
Is there Spindle
control signal input?
(IC202 pin 22)
YES
Is there Spindle
drive voltage output?
(IC202 pin 2,4,7)
YES
•Check the spindle Connector
(PN202)
•Replace the Spindle Motor.
NO
Is there DMO signal input?
(IC207 pin5)
YES
Is there Spindle
control signal output?
(IC207 pin 7)
YES
Replace the IC206 (BU4053).
NO
Is SPNON signal "H"?
(IC202 pin 23)
YES
Is SBRK signal "L"?
(IC202 pin 18)
YES
Is there
a SPNFG signal input?
(IC320 pin 95, IC301
pin 7)
YES
OK
-15-
NO
•Check the connection of IC301 pin2.
•Replace the IC301 (OTI-9790)
NO
•Replace the IC207 (NJM3404).
NO
•Check the connection of IC320 pin98.
•Replace the IC320 (MICOM)
NO
•Check the connection of IC320 pin94.
•Replace the IC320 (MICOM)
NO
•Check the connection of IC202 pin19.
•Replace the IC501 (BA6664FM)