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AV Receiver buzzing with nothing connected

Hey refurbished Onkyo receiver buzzes with or without anything connected to it and at various times. It'll be fine one minute and the next it will be buzzing like crazy. The buzz is coming directly from the unit and not going through the speakers when connected.

Can anyone tell me what is going on with it and what I can do to remedy the buzzing?

Thanks! I just opened my tx sr606 and I have the same problem. It seems to only start when the receiver warms up. It starts of low and gets louder. It makes the noise even without anything hooked up and the volume all the way down.

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Do you have any warranty on the refurbished unit? I would be first attempting to pursue the supplier that sold it to you to resolve the problem. 
If not.... the buzzing is caused by a loose lamination in the power transformer. Replacing the transformer will solve the drama. there are a few things that you can do to attempt a repair.  These are the measures that I have found to  have worked in the past when repairing this sort of problem. 

  1. Check and tighten all the casing and transformers mounting hardware/screws. Tighten any screws that pass through the transformer also. Try the amp to see what happens. If still buzzing, onto the next step.
  2. To settle the loose lamination, you can try to "Tap" the outside metal parts of the transformer about the laminations from several different directions   with a ball peen hammer (round end). You could also use a center punch to do this to produce a mechanical dent that puts pressure onto the laminations to resolve the problem.BEWARE- DO NOT HIT THE WINDINGS OR PLASTIC PARTS OF THE TRANSFORMER. The amount of force that you use here is up to you. don't go overboard, and watch your aim, don't hit anything but the transformer. It will often take some "denting" to produce the result we are looking for. Try it and see what happens
  3. Put a spacer under one mounting tab of the transformer to "flex" the casings. You may need to try all corners. 
Keep trying different combinations of the above, and hopefully you will be able to resolve it. Sometimes, there is nothing you can do but replace the transformer. I would spend at least 1 hour mucking around with it in the fashion described above, and you should be able to stop the buzzing. , I hope that you get it sorted. I have many times in the past. Good luck, let me know how you get on. Cheers
regards robotek

Posted on Jan 04, 2009

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