Question about Denon AVR-3300 Receiver

3 Answers

Buzz or hum

Recently the AVR-3300 starting outputting a 60 cycle buzz to all surround sound speakers. You can hear normal audio but there is a constant annoying buzz in the background. Buzz is present right at start-up of AVR and stays constant; never goes away, until AVR is turned OFF.

Buzz is present in all modes; DVD player, Tivo, and radio.

AVR has been disconnected. TV sound system is being used.

Does this sound like a power supply capacitor problem? I can replace capacitor(s) or other componets. I just need to know which ones.

Any assistance would be appreciated.

Thank you.

papaten@comcast.net

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3 Answers

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Here's a simple fix to this very common problem. The problem is most often caused by a groung loop between audio components. Try this, Get a piece of wire long enough to go from your receiver to the rest of the components. Strip the ends of the wire bare and touch the back or a bare metal (unpainted) spot on the receiver. While keeping the wire attached to the receiver, touch a bare spot on the other components. 9 out of ten times the hum will disappear. If / when it disappears, wrap the wire around a screw on the component and tighten it as well as on the offending component to make it a more permanent fix. Or,, get fancy and crimp proper lugs on the wire and make the connection that way. Looks better and will be more reliable. Just make sure both ends of the wire are touching clean unpainted metal on all offending components.

Posted on Jul 27, 2012

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Mine did the same.
The cause was the system that controls the fan. I had to bypass it and run the fan always. Probably finding what between the components that control the fan was better, but not for this old amp (at least for me). The fan that cool finals works with signal output and temperature, if temp is high but signal is low, fan stop, maybe something on this system was broken and the fan never started, making some caps too hot (we changed) and probably final stages too hot and buzzing.
Hope it helps (sorry for my bad english)
temp934-siemens@yahoo.com

Posted on Feb 14, 2008

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My guess would be +and -12v supply to preamp opamps has ripple. (drycaps or bad solder). I may be able to get you a pdf service manual if needed. kstahl65@att.net

Posted on Jan 31, 2008

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