Marantz NR1605/U1B Service Manual page 86

4.3. Analog audio
No audio output.
Is a voltage of ±7V supplied to AV
PCB CP5201?
YES
Is there an audio signal in AV PCB
CN4801?
NO
Is electron volume serial data being
sent to AV PCB CP5200?
YES
Once more, connect the connectors correctly.
If the malfunctioning channel and function can be identified, check the corresponding
signal path.
NO
Repair the ±7V power supply.
YES
Repair the power amplifier.
NO
Is the connector correctly connected
with HDMI PCB?
86
NO
Connect the connectors correctly.
YES
Repair the HDMI PCB.