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I have a Denon PMA-880R Integrated Stereo Amplifier that has suddenly stopped working. One minute everything is fine, next nothing.

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4 Suggested Answers

  • 88 Answers

SOURCE: Denon 528 amplifier cuts out after a few minutes

disconnect the speakers and see if amp will stay on. if this the case maybe suspect one of the o/p amps

Posted on Feb 08, 2010

dunnbiker
  • 8546 Answers

SOURCE: i have a fisher ca-9335

Something doesn't add up. You mention two connections to the speakers - CA-9335 and a "simple jvc cd player". Is that true? If so, you might want to UNconnect the CD from the speakers and run it into the receiver where it belongs. An amp isn't designed to share the load with another live device; or even have electrical contact with anything BUT speakers.


Did you actually find documentation that supports this hook-up? Or just winging it?

Posted on Feb 21, 2011

Testimonial: "thank you it works great now "

dunnbiker
  • 8546 Answers

SOURCE: My denon pma 355 keeps

You might want to get an understanding of why it gets so hot. It's not toaster. Repeated thermal stress wil eventually kill it.

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.

Posted on Jun 04, 2011

  • 1039 Answers

SOURCE: I have a Technics SU-G75

Try Panasonic.com

Posted on Jun 08, 2011

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dennyls@yahoo.com. Please put DENON in subject line.

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