Question about B&K AVR-307 Receiver

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Making a loud buzzing noise coming from the receiver AVR307 not through the speakers??

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  • rhecht May 29, 2010

    So how do you look for the fault inside the receiver? Anything noticeable?

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 Either some shielding baffles are loose and are vibrating or the transformer itself is generating too much sound . This happens when the power extracted thru it exceeds its capacity - there's a fault/short somewhere in the electronics. You will gonna have to open it and check for the fault.

Posted on May 29, 2010

Testimonial: "I will check it out and see if I can figure it out. Thanks for your help..."

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  • Azrael SRL May 29, 2010

    First of look for deformed capacitor or something that has a darkened color - signs of overheating. If you find some try to replace the damaged parts.
    Next put a pair of rubber gloves (some thicker ones) and start touching components to feel the ones that vibrates the most - if it's a baffle look at its fixings, they are probably loose; if it's the transformer then it's overstressed, you will have to test the voltages to identify witch part takes more power than it should (the voltage of the line powering that part will be lower than normal) then fix it.

  • Nessy Oct 13, 2011

    Did you fix it? I have the same problem.

  • connie Oct 16, 2012

    I have the same problem too

  • connie Oct 16, 2012

    Can anyone remcommend any place to fix this problem? I am not handy to fix it myself, I did open the box, and find a bad caps, but the posistion of the buzzing sound come from the speaker input side, not the transformer. I am confused.

  • Azrael SRL Oct 16, 2012

    When the cap is damaged it's no longer performing its duties - to filter the current. Because of that thecurrent that goes to the amplifier, and from there to the speakers, is full of ripples from the mains = hence the buzzing. All capacitors (not just the visibly dead one) must be replaced. It's a simple job that can't be too expensive - any person with basic soldering skills can do it.

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