No Sound, Noise Generated - Marantz HD-DAC1 Service Manual

3. No Sound, Noise generated

3.1. COMMON
Is the Fuse opened?
MAIN : AUDIO PART PCB (CUP12689-1)
F951
F952
F953
Is the wire properly inserted ?
MAIN : AUDIO PART PCB (CUP12689-1)
CN98
Check DC voltage
MAIN : AUDIO PART PCB (CUP12689-1)
IC98 3pin : +5V
IC99 2pin : +3.3V
Q955 emitter : +13.5V
Q958 emitter: -13.5V
CN62 4pin, 5pin : +18.5V
CN62 1pin, 2pin : -18.5V
Has the mute drive been cut in the playback mode?
MAIN : AUDIO PART PCB (CUP12689-1)
Q645 Corector : -7.5V
END
NO
YES
YES
YES
YES
Replace each Fuse.
NO
Insert the wire properly.
NO
Check Soldering or replace each device.
NO
Check the control signal in playback mode?
MAIN : AUDIO PART PCB (CUP12689-1)
WF61 5pin : playback mode : +3.3V
YES
Check soldering or replace.
Q645, Q646
38
NO
Check Soldering or replace
DIGITAL PCB (CUP12688)
IC11 or IC55