Question about Marantz Audio Players & Recorders

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Hello I have Marantz PM673 and it turns and function fine but suddenly it volumes down and finally no sound, if stays turned on soun come back. If any one may guess what is the problem it will be of great help.

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  • leksandor
    leksandor Jun 04, 2011

    I opened it and there is no unusual dust, but I saw 4-5 parts resistors or diodes, 4 in a row and one big resistor with black burn stains. Is there a way of posting photos here?

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  • Master
  • 8,546 Answers

I'd guess something heat-related.

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 28, 2011

  • 1 more comment 
  • leksandor
    leksandor May 28, 2011

    Thanks, for quick answer, I will open it and dust it then see what is happening.
    Also I read on this forum that "poor solder at the molex type connectors" may be the problem.

  • leksandor
    leksandor Jun 04, 2011

    I opened it up and there is no unusual dust, but I saw 4-5 parts, resistors or diodes, 4 in row and one bigger resistor for sure, with black burn stains. Is there a way of posting photos here?

  • David Dunn
    David Dunn Jun 04, 2011

    I'm sure there are ways to post photos somewhere on the web and postng a link to them but the bottom line is that you can't SEE the root cause of WHY they're burnt. Many posters take a swing at replacing the low-hanging fruit components they can see, then they're back here asking us why it still doesn't work. Online technology hasn't yet advanced to the point where we can see, smell, hear and manipulate the patient device.

    A hands-on tech would have a better chance of resolving the problem with some confidence.

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