Marantz PM7000N Service Manual page 43

TROUBLE SHOOTING
1. The power cannot be turned on
(STANDBY LED is not lit(STANDBY MODE))
Check insertion of the connector of the SMPS PCB.
Check insertion of the connector of the DIGITAL PCB.
Check the [CN1800 : 1pin ST+6.8V] of SMPS PCB.
2. The power cannot be turned on
(STANDBY LED is lit → light flashes)
Check insertion of each connector.
Check conduction of FUSE [F1801]
Check the conduction of the MAIN TRANS winding.
Check the conduction of [D8509 - 8518].
No voltage
Failure of the SMPS PCB.
Check the [CN103 : 1pin P3V3_UCON] of DIGITAL PCB
With voltage
No conduction.
Broken wire in FUSE [F1801].
No conduction.
Broken wire in MAIN TRANS.
No conduction.
Broken wire in [D8509 - 8518].
STANDBY LED flashes on/off every 0.5 seconds.
It conducts.
Check the conduction of the MAIN TRANS winding.
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No voltage
Disconnection of MAIN PCB [BN712], malfunction of [IC718] or
disconnection of 7P CARD WIRE inserted in [CN103].
[IC105] or [IC104] failure of DIGITAL PCB.
With voltage
Failure of the DC OFFSET DETECT.
Failure of the OVER HEAT DETECT.
Failure of the OVER CURRENT DETECT.
Failure of the P_DWN detection.
Malfunction of [U101].
Failure of the power amplifier circuit.
Failure of the power supply circuit.