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.

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Re: Buzz or hum

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

Re: Buzz or hum

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)

Posted on Feb 14, 2008

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Re: Buzz or hum

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.

Posted on Jan 31, 2008

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2 Answers

Hum created by Denon AVR-3300

Look for bad electrolytic capacitors. Swollen up on top or leaking, puffed out on bottom. If they look alright, you will need a capacitor tester to see if any have dried up. That's the first thing I check for hum.

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I have an older model Harman Kardon AVR and have started hearing humming from the speakers that are attached to it. Is my receiver going bad or is there something else I need to do to fix this problem?

you may have a bad Earth power 110 V AC cable connection which makes such hum / buzz even nothing connected..
Check the connections between components and make sure they are secure before proceeding to the next Step. Sometimes, loose connections can cause a hum.
  • Separate the audio cables from the power cables; electromagnetic interference from the power cables can cause stereo hum. Use cable ties to secure the audio cables away from the power cables.
  • Plug in a surge protector to the outlet, and then plug all the components into that surge protector
  • Connect a ground plug to the surge protector and then plug the ground plug into the main outlet. A ground plug is available at any hardware store, and turns a three prong connection into a two prong. Ground plugs help eliminate 60 cycle hum.
  • 5 Connect the ground wire from your turntable to the ground wire connection on the receiver. If this doesn't work, looking on the back there should be a grounding point,

    Unplug your receiver.. Split a wire and attach one of the splits to the receiver where you will see the text, "ground" or something similar. Attach the other end to something metal such as a pipe that goes into the ground. Secure with electrical tape. Plug in.
    connect the ground wire to a screw on the electrical outlet.

    Read more: How to Fix a Hum on a Stereo Receiver '

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    I have a buzz / static that appears for the first 15 minutes.


    I just opened up an AVR3300..It's trouble is that it goes into stndby
    at once.
    The BIG power supply caps are VERY swelled at the top.

    That would be my informed view on why it's bad.

    I suggest you look at that being your possible trouble too.

    Scott in Vermont

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