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I have a relatively new (less than 3 months old) Harmon Kardon Receiver HK3490. It turns on but immediately turns off. You can hear a clicking sound like a breaker is disengaging. The problem started when the Niles speaker selector autoformer MSA-10A that was connected to it went bad. The ac power supply on the Niles shorted out. I've tried the reset button on the receiver but this does not correct the problem. Any suggestions?

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It is a relay clicking. You will need to obtain a schematic to troubleshoot this but they are available online. The protection circuits have been degraded from the short circuit but it is still alive and the discrete components are easy to replace. I used to use Sam's Fotofax but googling your HK model will get you alot of results. Harmon Kardon is a great brand and definitely worth fixing. ~Steve Medley

Posted on Nov 08, 2008

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