No sound from input terminal.
Confirm the symptom by
re-connection or change the cable
from PC, COAX IN or OPT IN.
Not detected.
Connection failure or Cable Failure.
Detected.
Is FFC between
Main PCB and Digital PCB
damaged?
YES
Replace FFC.
NO
Replace Main PCB.
Still not remedy.
YES
Replace FFC.
Is the correct voltage
presented at Pin 1 of P4551
on Main PCB?
Normal: +14.5V
Replace AMP PCB.
Replace SMPS PCB.
Is the correct voltage
presented at Pin 30 of P6502
on AMP PCB?
Normal: +14.5V
NO
Replace FFC.
NO
YES
Is the correct voltage
presented at Pin 5 of P6001
on AMP PCB?
Normal: +14.5V
YES
YES
NO
Replace Digital PCB.
YES
NO
Is the correct voltage
presented at P9503 on Digital PCB?
Between
Pin 7 and 30: +3.3V
Pin 8 and 30: +1.8V
Pin 9/10 and 30: +1.2V
NO
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