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Marantz Amp I have a Marantz 6010OSE KI signature amplifier that has a problem. Whenever the amplifier is moved, the left channel stops working, or will only emit very weak sound with no bass. If I tap the side or top of the case eventually it will start working again. Sometimes it will start working again straight away, and at other times it will take quite a few taps before its right. Any ideas?

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  • 3 more comments 
  • wadden Mar 28, 2008

    No, it is still just out of the right channel when I turn it up

  • wadden Mar 29, 2008

    Thanks for the help Graeme, I had the top and back off the amp last night and checked everything. There was nothing obvious regarding the soldering, but when I put it all back together, there was no sound out of either channel, until I pressed the source direct button, then perfect sound on both channels. Does this suggest it might be something to do with the balance control (there are no tone controls)?



    Many thanks

  • wadden Mar 31, 2008

    Thanks Graeme, I will give that a go and hopefully all will be ok.

  • Graeme Ross
    Graeme Ross May 11, 2010

    Ah, could have been a speaker protection relay, but this fault often clears when you turn up the volume.

    Sounds like dry solder joints in the amp. Have you removed the covers and checked about the power stages for dry solder joint, or cracked heat stressed connections about output stages and power supply. 90% of problems in audio output stages are generated by fry joints and soldering failure. I often blanket resolder every joint, to ensure that there are never any again in the future.

    Gte back to me here and we can go further after you have checked for soldering problems.

    regards
    Graeme

  • Graeme Ross
    Graeme Ross May 11, 2010

    Hi there, a question for you.,.. what happens when you turn the vol up, does the audio clean up and come good?

    regards
    Graeme

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  • 1,512 Answers

Hi, well done in diagnosing your problem:) From what you have just told me, the amp has noisy source selector switching, and may even have more than one switch or control causing the problem. Start with the source/direct button.
To resolve this, best bet is to "flood" the internals of the switch or control with CRC 2-26 . This will clean the contacts and leave a layer of lubricant to prevent the problem reoccurring, Getting the spray into the controls is the hard part. Check out what you find by way of entry points that you can get a the delivery straw into to spray. Sometimes you can use the a hole on the top of the switch, or "click" the top of it a little, enough to get the sray in. If the switch is a hermitcally sealed type, i have in the past used a pin vice and a very small drill to make a hole at the very back of the switch creating a place to get the spray in. Check it out and see how you go.

regards
Graeme

Posted on Mar 29, 2008

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