Question about Harman Kardon AVR 500 Receiver
Of late I have been getting an annoying hum on the RLC channels of AVR500. The SRSL channels seems to have no hum.
I have replaced the power strip with a high quality Belkin power strip
I have removed all the input sources and it still appears
When switching from source to source, the hum disappears briefly
I have uncoiled all the wires and laid it out straight
I have tried grounding the unit properly
I have tried grounding the Black terminal of the speaker
I am willing to open the Revceiver and replace any parts myself if I have enough info to try it out.
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Posted on Jan 02, 2017
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Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
Reverse the cables Left to Right to see if it stays with the cable or the input channel. Follow it back to the source, isolating in the same manner. Eventually you will find the entrance point of the hum. Freqquently a cable
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