Marantz HD-DAC1, Service Manual

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35
Is the Fuse opened?
MAIN POWER PART PCB(CUP12689-1)
･ F902, F903, F904, F905
Is all AC voltage normal?
MAIN POWER PART PCB(CUP12689-1)
･
CN93 pin1-2pin : around 7V (AC)
･
CN93 pin4-5pin : around 7V (AC)
･
CN93 pin6-7pin : around 36V (AC)
Replace any fuse.
Replace main transformer.
NO
NO
YES
YES
YES NO
END
Check control signal
MAIN POWER PART PCB(CUP12689-1)
･ BN92 14pin(CTL_USB):+3.3V
Check DC voltage
SUB TRANS PCB (CUP12689-2)
･ IC91 4pin : +3.3V
MAIN POWER PART PCB(CUP12689-1)
･ IC92 4pin : +5V
･ IC93 4pin : +5V
･ IC94 2pin : +3.3V
･ IC95 2pin : +3.3V
･ IC96 2pin : +5V
･ IC97 1pin : +5V
･ Q905 Emitter : +39V
DIGITAL PCB (CUP12688)
･ IC15 3pin : +1.8V
･ IC16 3pin : +1.2V
･ Q104 1pin : +3.3V
Check control signal
DIGITAL PCB (CUP12688)
･ IC11 4pin (CTL_USB) : +3.3V
･ IC11 118pin (CTL_+3.3USBB): +3.3V
･ IC11 119pin (CTL_+1.8V USBB): +3.3V
Check Soldering IC11 or replace IC11.
Check Soldering all control line and CN11/BN92.
･ DIGITAL PCB (CUP12688)
･ MAIN POWER PART PCB(CUP12689-1)
Check Soldering or replace each device
NO
NO
YES