Marantz HD-DAC1 - TROUBLE SHOOTING; Power Not Turning On

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TROUBLE SHOOTING
1. Power not turn on.
Is the connector properly connected ?
･
WF94/CN94
Check +3.3ST output voltage
･
MAIN POWER PART (CUP12689-1)
･
BN92 10pin
Has the power relay switched?
･
SUB TRANS PCB (CUP12689-2)
･
RY91
Replace IC91.
Is the control signal (STB_CNT) for the power
relay drive circut nomal ?
･
BN92 11 pin (3.3V) or
･
D907 anode low signal (0V)
Check the signal line from the u-com
(IC11 90pin) of the DIGITAL PCB,
and the soldering of the surrounding
circuits. Replace the u-com if any
abnormalities are foound.
･
IC11 pin90
If the power relay control circuit is normal,
replace ther power relay.
･
RY91
Next page
Is the Fuse opened?
･
SUB TRANS PCB (CUP12689-2)
･
F901
Replace F901.
Connect the connector
properly.
Is IC91 5 pin around 5.3V?
･
SUB TRANS PCB (CUP12689-2)
Replace T901 or D901/D902/
D903/D904.
Is IC91 4pin 3.3V ?
･
SUB TRANS PCB (CUP12689-2)
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES YES