Denon AVR-4520CI Service Manual page 112

4.3. Analog audio
No sound is output
Is the voltage of ±7V supplied to
A POWER B'D N3902 1-3pin?
YES
Is the audio signal transmitted to
AMP CONNECT B'D N9002,N9016?
NO
Is the serial data for electronic volume
transmitted to CONNECT B'D N3002
6,7pin?
YES
Once more, checking the connection of the connector.
When can specify the trouble of the channel and function, check signal route where it
corresponds.
NO
The power supply of ±7V is repaired.
YES
The power amplifier is repaired.
NO
Is the connector correctly connected
with DIGITAL B'D?
112
NO
Connect the connectors properly.
YES
The DIGITAL B'D is repaired.