Denon AVR-X1200W Service Manual page 80

4.3. Analog audio
No audio output.
Is a voltage of ± 12 V supplied to
DIGITAL PCB CN823?
YES
Is there an audio signal in DIGITAL
PCB CN822?
NO
Is the serial data for electronic volume
sent to the IC821 of DIGITAL PCB?
YES
Reconnect the connectors correctly.
If the malfunctioning channel and function can be identified, check the correspond-
ing signal path.
NO
Repair the ± 12V power supply.
YES
Repair the power amplifier.
NO
Check the CPU.
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