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Posted on Aug 30, 2008
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Sir,I have a marantz pm-5 amplifier that the speakers cutout at about 1/2 volume which I beleave is the protection circuit. Below that volume it plays.This happens when first started up cold.I'm playing it thru ar-915 speakers or sansui. Thanks DAVE

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  • terryb164 Aug 30, 2008

    It's not a connection problem. All inputs act the same. There is a protection circuit, What sets it off or activates it?

  • terryb164 Aug 30, 2008

    I'll try what you said about the voltage and accept it. If this doesn't fix it, am I charged again for more assistance?

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1 Answer

Anonymous

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  • Posted on Aug 30, 2008
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Connection problem.please check

  • 2 more comments 
  • Anonymous Aug 30, 2008

    same problem like you to another user.

    I came across a PM-5 amp, and it looks like it was in a basement for a while collecting moisture and getting surface corrosion. The unit powers on, but I do not hear the speaker relay click I am familiar with on my other Marantz units. There is no output, should I be taking it apart to clean the relays. Are there relays? Should I be looking for other stuff?
    Thanks



    what he did.

    the company tech told him.

    Yes there is a relay.
    Clean it and also a good idea is to clean all pots and switches.

  • Anonymous Aug 30, 2008

    If a relay doesn't click then it tell's you that the protection circuit is messuring a to high or to low dc-offset beyond approx 700mV + or -

  • Anonymous Aug 30, 2008

    black box is a relay. Should have 6 connections on bottom. 2 for coil, 2 for R&L in(amp side) and 2 for R&L out. Check DC offeset from the bottom of the board at the relay terminals on the amp side.

    If DC looks good check for sound by connecting a junker speaker -ve to ground and +ve to amp side relay terminal.

  • Anonymous Aug 30, 2008

    thanks.please rate the solution .sir.

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