Question about Denon AVR-4806 Receiver

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Denon AVR-4806 I work for RAC natnl. Product Service and my receiver has static in all channels and will flair up and put the unit into shutdown. I can scope the input caps at all the volume control IC's and the signal is clear from like the tuner but at the output of the volume controller IC's, you can see the static and flairing up. Seems to be all channels. Is there a fix or do I need to persue a new Audio Unit board? Is one available?

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The most likely cause of this is a failing transistor or two in the pre-amp section. There should be a pair of transistors in what is caled a dif-amp setup. These are the most likely candidates for replacement. They may be in a single 5 pin package. If you can, try hitting some of the transistors with freeze spray when the problem occurs. If the problem goes away, the last part hit with the spray is the likely faulty component.

Dan

Posted on Jun 11, 2008

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