Harman Kardon Avr 510 Buzzing - AVS Forum
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Old 03-26-2006, 04:32 PM - Thread Starter
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I have a Harman kardon Avr 510 that works perfect when i start it up but after a few minutes of loud listening or half hour normal listening the coil in the inside of the receiver starts to buzzzzzzzzzzzzzzzzzzzzzzzz it's not very loud and sounds almost like a razor, everything works fine, speakers sound perfect, but the buzz stays untill the receiver's shut off for a few minutes, is there a connection lose or is the coil malfunctioning? where would I find a new coil for it?
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Old 03-29-2006, 10:26 PM
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Not sure what 'coil' you're referring to...do you mean the power supply? Perhaps the
capacitors are getting old (I know mine did) and are starting to leak but this will usually send any buzzing out to the speakers. Do you see any problems using the OSD like wavy lines, text or ascending/descending bands of color?

My old 510 has had the caps replaced but my 310 is starting to show the problems described above. Whenever the unit is powered off and then on again the buzz takes a good while to cease. It disappears when the OSD has returned to normal.

If your problem is not Cap related you might just want to open the case and operate the unit using common sense precautions to identify as closely as possible where the problem lies. It may simply be a heat expansion issue which could be easily remedied.
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