Question about Harman Kardon AVR 500 Receiver

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A/c Hum on r + l + c

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.

Posted by on

  • burgard2004 Nov 25, 2008

    My avr 500 makes a hum or buzz noize,more of a hum though.I've diconnected every thing from receiver,amps and all.Reconected it to other outlet with speaker and still get it.I,ve looked up a lot of information on buzzing/hum but it sounds like a ground loop problem.Is it an easy fix?Thanks steve

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  • 2,296 Answers

The hum noise you are getting it could be producing due to a poor DC filtering due to leaky or dry capacitor(s) in the power supply section.
Pay attention to the biggest capacitors for bulging or leaky conditions.
Let me know if you need further assistance.

Posted on Jul 21, 2008

  • Jaime Hernandez Jul 21, 2008

    The capacitors could have a value of 10000uF/63v and you could also find 2200uF/35v but I would keep an eye on the bigger ones.

    Good Luck.

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