Question about Yamaha DSP-A1000 5-Channel Amplifier

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I have a Yamaha Natural Sound Stereo Receiver RX-750 (purchased maybe around 1992-1993?). The input selector switch doesn't seem to be working properly. No matter which input I select, the sound is fuzzy and static-y. If I giggle the knob or press it in tightly, the sound will sometimes clear up, but often goes right back to fuzzy as soon as I remove my fingers. I have to keep playing with the knob until I finally get clear sound. Can this be repaired on a unit so old? Is this unit worth repairing? (It was quite expensive when I bought it.) Can I repair it myself if I get parts? How difficult? Thanks!

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  • Anonymous Mar 09, 2009

    Thanks for the assistance! I successfully removed the cover from the stereo and the knob from the front. However, with those removed, I am in unfamiliar territory. Where do I squirt the CRC 2-26? I am assuming it would be on the side of the front panel where the knob was removed, not from the back side. However, looking inside the hole where I took the knob off, I'm not sure where to start squirting. Here are photos:

    Photo 1
    Photo 2
    Photo 3
    Photo 4


  • Anonymous Mar 12, 2009




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Hi cfipp
You could fix this problem with a quick squirt of CRC 2-26 into the function selector switch connected to the knob you are wriggling. This will sort out the problem. If you need further advice, feel free to ask me. I will help you. 
regards robotek

Posted on Mar 08, 2009

  • 2 more comments 
  • Graeme Ross
    Graeme Ross Apr 16, 2009

    Hey no worries, the last photo of the internals shows you. The metal clad box behind the selector switch. If you can spray(literally flood) the switch with short bursts of CRC using the plastic extension straw. whilst operating the function selector switch. It is a good idea to do this with the lid removed and the amp sitting on one end. Beware as some of the spray will run out of the unit. Newspaper underneith it is a good idea. I generally do this with the lid off, a signal and speakers connected to "hear" removing the crackle. If you are not familair with mains voltage equipment, then I suggest that you DO NOT have it turned on whilst messing about with the lids off. . Good Luck! Let me know how you go. 


  • Graeme Ross
    Graeme Ross Apr 16, 2009

    Oh, and you need to spray the CRC into the selector switch at or via the slots and any holes/opening in the metal casing around it(last picture, device behind the front panel selector shaft, about middle of the last photo. . You cannot get to it from the front panel as the . 

  • Yaohsien Fu
    Yaohsien Fu Apr 15, 2016

    I can't see the photos you mentioned.

  • Yaohsien Fu
    Yaohsien Fu Apr 15, 2016

    I just ordered a new selector switch. I can't find any replacement video in Youtube so I am not sure how easy to do it myself. If not easy I may cancel the order. Please reply soon.



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