Denon Pma-655r User Manual -

| Problem | Likely Cause (from manual) | Solution | | :--- | :--- | :--- | | | Power cord disconnected, or AC outlet dead. | Check cord. Reset the circuit breaker. | | No sound (protection mode) | Speaker wire shorting, or overheating. | Turn off amp. Check speaker wires. Wait 10 minutes. Turn on with volume at minimum. | | Hum in phono input | Turntable not grounded. | Connect ground wire to GND terminal. | | No digital signal | Incorrect input assignment. | Press DIGITAL/AUTO/ANALOG button until "DIGITAL" appears. | | One channel silent | Balance control turned fully, or faulty interconnect. | Center the BALANCE knob. Swap left/right RCA cables to test. | | Remote not working | Dead batteries, or sensor blocked. | Replace batteries (2x AA). Ensure no direct sunlight on the IR receiver. |

: Ensure all cables are securely connected and that the volume is not set to extreme levels that cause clipping. Denon Pma-655r User Manual

Denon no longer supports this model directly, but the manual is widely available online: | Problem | Likely Cause (from manual) |