Question about Onkyo HTR500 Receiver
Hey there...my 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?
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.
Posted on Jan 04, 2009
SOURCE: Onkyo tx-sr606 receiver buzz
This kind of noise can be caused by a transformer that was poorly made.
Iron core transformers are normally 'potted' in a vacuum so that epoxy (or lacquer) is forced into the laminations to prevent them from trying to vibrate with the line frequency.
If you are adventurous, remove the housing, turn on the power and using an insulating probe such as a plastic rod (a plastic picnic knife will work), place the tip of it on any larger parts you see and place the other end behind your ear. This will carry the sound in a more directional manner to your ear. You should be able to locate the source of the buzz.
If you can, and it turns out to be a transformer, it will probably have a metal shield around it so it might not be possible to gain access to the laminations. If the shield isn't ultra tight, you might be able to flow some 'Super Glue' into the cracks and with luck, 'glue' the laminations together. Super Glue (or equivalent) is a good insulator so will not cause any electrical problems but take care not to get it on any plastics that are exposed with the housing on, it will cloud them forever.
Posted on Feb 27, 2010
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