Question about Harman Multimedia Harman Kardon HK 3490 Stereo Receiver

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Hk3490 check amp amp protect why does this occur?

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Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Posted on May 24, 2011

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This amplifier can go into protection if one of the low ohm resistors on the power module that is soldered to the transformer is defect. Check out R951 and R952, they are both 0R47 (0,47ohm). They are often broken and measure some kilo ohms.

Posted on Nov 27, 2013

  • James Chavez
    James Chavez Jan 04, 2016

    Are these resistors linked separately to the left and right channels? My receiver goes into amp protect mode only when a speaker is hooked up to the either spk 1 or 2 right channel. I've tried this with many different speakers, including the ones that I can hook up to the left side without it going into amp protect.

    Thanks!

  • berggei Jan 04, 2016

    This resistor are commen for both channels. So not linked separately to left and right channel. I would check and see if you have DC on right channel speaker output.

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Hi I have same problem what could be the issue?

Posted on Mar 03, 2013

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The examples provided assume a properly working/functioning circuit breaker protection. However, if the circuit breakers are faulty, it is possible to recieve much higher vlotages and Amps, since there would be no protective circuit breaker that could trip the power off. In that case, the Main circuit breaker becomes the fail-safe protective device and that could have a much higher Amp rating, thus the maximum Voltage/Amps would be limited by the Main electrical ciruit breaker and electrical supply available at the location where the short circuit occurs.

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If the amp continues to go into protect with no external connections (other than B+, remote and ground) and the voltage remaiins above 11v, the amp is defective.

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