Harman Kardon CDR20 Service Manual page 24

CDR20
TROUBLESHOOTING GUIDE FOR CD-RW BOARD
Reset or Power Check.
•Is the Pin 1, 3 of PN105 5V?
•Is the Pin 5 of PN105 12V?
YES
Does the pin1
of IC101 change 0V to 5V at the power
supply initial input mode?
YES
Are the X701 and X301 oscillating?
YES
•Is the pin4 of IC103 3.9V?
•Is the Pin32 of IC401 2.0V?
•Is the Pin4 of IC102 3.3V?
YES
•Is the Pin7 of IC514 2.5V?
•Is the pin1 and 2 of IC514 2.0V?
YES
•Is the pin1 of IC511 8.0V?
•Is the pin1 of IC512 8.0V?
YES
OK
NO
• Check the PN105.
• Check the SMPS board.
• Check the IC101(RESET IC).
NO
• Check the IC301(HD64F3062),
IC301(XC10TQ80)
NO
•Check the X701, X301.
•Check the IC701, IC301.
•Check the IC103(BA3939).
NO
•Check the IC401(CXA2551R).
•Check the IC102(BA033S).
NO
Check the IC514(NJM3414).
NO
•Check the IC511(NJM7808).
•Check the IC512(NJM7808).
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harman/kardon