Question about Onkyo TX-SR803 Receiver

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Onkyo integra a-809 amplifier

Sometimes this amplifier will switch by itself from cd to tv to etc., etc. without being directed to. It will play uninterrupted at times for and hour or so and then "go crazy". Other times it will only play a few minutes before switching from input to input. We think we have eliminated potential problems - such as over heating (it is not) and have pulled some inputs to see if they were a problem - they weren't. Do you have any ideas?

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  • midipiano Jan 16, 2008

    We think we fixed the problem. Our Onkyo amp is connected to an Onkyo CD player. There is a small blue cord marked R-1 that hooks the two together so that the amp's remote will also work the cd player. We determined that the infrared signals were feeding back off each other. Taped a piece of paper over one of the infrared sensors and now the amp is behaving!!

  • Anonymous Jun 03, 2008

    I have the same exact problem with my A-809


  • happythecat Dec 31, 2008

    Same problem here. How do you get at the input switch on the A-809? I opened up the amp and could not find a way to get at the back of the switch to DeOxit it. Any suggestions?


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I recently had an extended episode solving a distortion issue with my Onkyo A-807. I also asked my repairman about the spontaneous switching of the output selector. He told me the output is managed by a motor driven selector located in the back of the unit, not where the dial is, so I don't expect cleaning the contacts at the knob to help. The idea of protecting the remote cable, if you use it, seems more plausible. The contacts at the knob are very difficult to access, and according to my repairman, the motor is in a sealed compartment - so I think remedies other than protecting the remote cable will be difficult.
Just FYI, my distortion problem was from the record selector position "Source". It goes away when the selector is in the "Off" position, or when I disconnect the cable going from my CD recorder to the DAT "REC" jack in the back. I spent a lot of time and money figuring this out. I suspect it is an issue with more than just my unit. If you don't have anything plugged into the DAT jack, or leave the record source on off , you'll never notice this and enjoy a happier listening experience.

Posted on Apr 24, 2010

  • babyrea Apr 12, 2016

    Update: There is a post on Youtube currently where the fellow does what JohnShultz below recommends. I did this and have enjoyed a couple of weeks of no auto-switching. I had more trouble removing the knob than he did, even using the rubber band helper. When I put the knob back on, I didn't push it in too hard. Perhaps the knob being pushed in over time contributed to the problem or maybe it just needed cleaning. I used a Radio Shack product on mine.


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Use Deoxit on the switch. It is a contact cleaner available at Radio Shack and Fry's. Exercise the knob well. It worked for me on my newly acquired Onkyo A809.

Posted on Jul 30, 2008

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Disable wire from back of the selector motor which has four wire ribbon (Jumper 211) for the A809. Something wrong with logic chip which control the motor. After that it works fine on my A809.Hope this will help.

Posted on Sep 21, 2010

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I have had this switching problem on my Onky Amplifier Integra A-807 with only 5 years of usage. Apart from that the tape deck, Onkyo TA-207 would start recording on a protected tape at odd times once the amplifier switches on.

So, sorry that I have not a solution for this, but I wonder, is not Onkyo a good HI-FI brand?

Posted on Dec 27, 2009

I had this problem with the Onkyo A809 just rec'd from ebay. I used Deoxit contact cleaner on the input selector switch and exercised the control well. The problem disappeared. Deoxit is sold at Radio Shack.

Posted on Jul 30, 2008

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I have the same exact problem with my A-809. Started today. The input switch gotes nuts. Would love to see some ideas.

Posted on Jan 16, 2008

  • theruleris
    theruleris Apr 01, 2013

    Had the same problem, it is the source selection rotary switch itself. I de-soldered it completly and the problem went away. I can only switch the input source by remot control. Not really a problem for me. BTW I found it not so hard to reach, carefull with unplugging connectors though, pry them loose don't pull.


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