Question about Denon AVR-1600 Receiver

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Denon DRA 335R changes from tuner to phono by itself or turns off by itself

I have removed the batteries from the remote control and no change.

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  • pagedouglas Nov 11, 2008

    I tried this and am waiting for the results as the problem is very sporatic and unpredictable. I don't have alot of faith in the solution as the unit is plugged into a switchable outlet that occationally get turned off anyway. But I appreciate the response.



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One thing that may help you with the problem is to power the amp right down by disconnecting from the wall socket, and then power up again 30 mins later. This will allow for a complete reset of the microprocessor stages of the unit. Try this and let me know how you get on. If the problem does not go away, happy to talk to you more about it.


Posted on Nov 09, 2008

  • Graeme Ross
    Graeme Ross Nov 12, 2008

    ok, initially it just sounded a lot like a corrupted program counter to the firmware controlling front panel operations, If it always switches to phono when the problem occurs, what happens with audio, and can you just reselect tuner after the problem occurs.

    Sometimes this condition can be caused by a collapsed tact switch for the source being ghost selected. Or broken plastic button press assemblies to the front escutcheon. . Usually these problems can be ascertained by the "feel" of the button.

    If the unit actually locks out to the phono input, and wont allow you to select anything else, it can relate to a faulty reset device to the front panel processor, or even a hair line fracture to the front panel PCB. Attempting to get the unit to fault with external stimulus is the approach to take on the bench to fix it. Things like mechanical tapping, application of heat and cooling, this sort of approach. I have also seen some units that use a serial bus to control input stage switching IC's where the input IC's can be damaged(intermittently switching) by a static discharge from connecting switch mode power supply equipment like TV, video, and VCR's. They can out of the blue change sources, although the front panel indication often stays, just the audio switches.

    Can you let me know a little more about the circumstances surrounding the occurrence of the problem.






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