Denon AVC-4310 - Analog Audio Troubleshooting; Troubleshooting No Sound on 8 U-210063 Audio Board

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AVR-4310CI/AVR-4310/AVC-4310
5. Analog audio
5.1. 8U-210063
No sound is output
YES
Is the voltage of ± 7V supplied to 8U-
210063 CY073?
NO
The power supply of ±7V is repaired.
YES
Is the audio signal transmitted to 8U-
210063 CY192?
YES
The power amplifier is repaired.
NO
Is the connector correctly connected
with ucom board (8U-210064)?
NO
Connect the connectors properly.
Is the serial data for electronic volume
transmitted to 8U-210063 CW132?
NO
YES
YES
The ucom board (8U-210064) is
repaired.
Once more, checking the connection of the connector.
When can specify the trouble of the channel and function, check the signal route where it
corresponds.