NAD C660 Service Manual page 11

TROUBLESHOOTING GUIDE FOR CD-RW BOARD
Reset or Power Check.
•Is the Pin 1, 3 of PN403 5V?
•Is the Pin 5 of PN403 12V?
YES
Does the pin1
of IC326 change 0V to 5V at the power
supply initial input mode?
YES
Are the IC405 Pin 4
and X302 oscillating?
YES
•Is the pin4 of IC305 3.9V?
•Is the Pin32 of IC108 2.0V?
•Is the Pin4 of IC414 3.3V?
YES
•Is the Pin7 of IC210 2.5V?
•Is the pin1 and 2 of IC210 2.0V?
YES
•Is the pin1 of IC204 8.0V?
•Is the pin1 of IC205 8.0V?
YES
OK
NO
• Check the PN403.
• Check the SMPS board.
NO
• Check the IC326 (RESET IC).
•Check the X302, IC405.
NO
•Check the IC320 (µ-COM), PN402,
Pin 7 (33M).
•Check the IC305 (BA3939).
NO
•Check the IC108 (CXA2551R).
•Check the IC414 (BA033S).
NO
Check the IC210 (NJM3414).
NO
•Check the IC204 (NJM7808).
•Check the IC205 (NJM7808).
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