Denon AVR-X4200W Service Manual page 109

4.3. Analog audio
No audio output.
Is a voltage of ± 7V supplied to SIDE CNT
PCB CN64C 4-7 pin?
YES
Is there an audio signal in AMP PCB CN461?
NO
Is electron volume serial data being sent to
SIDE CNT PCB CN23C 15, 16, 17 pin?
YES
Reconnect the connectors correctly.
If the malfunctioning channel and function can be identified, check the correspond-
ing signal path.
NO
Repair the ± 7V power supply.
YES
Repair the power amplifier.
NO
Check the CPU.
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