Analog Audio - Marantz AV7703 Service Manual

4.2. Analog audio

No audio output.
Are the CN64C 4-7 pins in the SIDE CNT circuit
board receiving ± 7V?
YES
Is serial data for electronic volume transmitted to
SIDE CNT PCB [CN23C 4, 5 pin] and FRONT CNT
PCB [CN26C 14, 15 pin]?
YES
Reconnect the connectors correctly.
If the malfunctioning channel and function can be identified, check the corresponding signal path.
NO
Repair the ± 7 V power supply.
NO
Check the CPU.
86