HARMAN KARDON CDR20
Manual de Servicio

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

NO

� Check the PN105. � Check the SMPS board.

Does the pin1 of IC101 change 0V to 5V at the power supply initial input mode? YES

NO

� Check the IC101(RESET IC). � Check the IC301(HD64F3062), IC301(XC10TQ80)

Are the X701 and X301 oscillating?

NO

�Check the X701, X301. �Check the IC701, IC301.

YES

�Is the pin4 of IC103 3.9V? �Is the Pin32 of IC401 2.0V? �Is the Pin4 of IC102 3.3V? YES

NO

�Check the IC103(BA3939). �Check the IC401(CXA2551R). �Check the IC102(BA033S).

�Is the Pin7 of IC514 2.5V? �Is the pin1 and 2 of IC514 2.0V? YES

NO

Check the IC514(NJM3414).

�Is the pin1 of IC511 8.0V? �Is the pin1 of IC512 8.0V? YES OK

NO

�Check the IC511(NJM7808). �Check the IC512(NJM7808).

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