Denon AVR-1613 Service Manual page 71

4.3. Analog audio
No sound is output
Is the voltage of ±12V supplied to
DIGITAL B'D CN893?
YES
Is the audio signal transmitted to
INPUT B'D CN892?
NO
Is the serial data for electronic volume
transmitted to DIGITAL B'D IC891?
YES
Once more, check the connection of the connector.
When you can specify the troubled the channel and function, check the corresponding
signal route where it corresponds.
NO
The power supply of ±12V is repaired.
YES
The power amplifier is repaired.
NO
Check the CPU.
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