Question about Onkyo TX-SR606 Receiver

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A couple of weeks after initial setup of my brand new Onkyo XT-SR606 receiver, I noticed a loud buzzing noise that starts up approximately 10 min after the receiver is turned on. The buzzing is definitely coming from the receiver and NOT the speakers. The receiver is exposed to ambient air in a large cabinet, and does not appear to be overheating. The buzz does not go away after clearing the custom settings and going to stand by. Disconnecting the speaker and component inputs/outputs has no effect. The buzzing is still present. What's going on???

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The "buzz" you hear is a power hum made by the power supply transformer. It's technically called "Lamination hum" caused by the revering of electrical current through the power supply transformer. In some cases the hum can vibrate the chassis causing other loose material to vibrate. If you can, go to your dealer and check to see if other units of this same type typically make a hum this loud, and if not, see if he can solve the problem for you.

Posted on Feb 27, 2009

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