Question about Harman Kardon AVR 510 Receiver
Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversable, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's. I've also seen variable track lights induce noise but it's usually minor.
If it still does it with no cables or anything external attached it's an internal problem.
Posted on Dec 31, 2010
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Posted on Jan 02, 2017
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