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My Marantz PM-45 integrated amplifier will occasionally cut out by switching off a relay.

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Hi HouseofBlues

The problem you are facing is the speaker protection is turning on to prevent the amplifier from damaging your speakers. It will need some service work done to it to prevent it from happening. I suggest you get it attended to sooner than later, as the problem will be caused by dry solder joints that will need to resoldered, or a semicinductor that is failing. If you are a gun with a soldering iron, you could do this yourself. Check about parts of the amp that runs hot, particularly transistors and resistors in the output stages. resolder all output transistors, and any parts that are mounted to a heatsink. Also focus on areas of the PCB that has discoloured. This is often where the problems occur.
I am more than happy to answer any other questions you may have about it, just give me a hoy :)
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Posted on Jun 02, 2008

  • Graeme Ross
    Graeme Ross Jun 05, 2008

    Hi, just a quick followup to see how you got on with your
    problem. If you still havent got it sorted, let me know, I am happy to
    do some more research and offer some more information and solutions. If its fixed...
    excellent!! A FixYa rating from you will close this unrated solution
    for me. Thanks for using FixYa. I am happy to answer any other
    questions you may have.



    regards

    robotek


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