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Marantz AV550 problem

My marantz av550 pre amp keeps cutting out and when I turn it back on it buzzes loudly inside the pre amp and through the speakers.

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  • ssryan2 Jan 28, 2009

    After the buzzing stops the audio goes on and off repeatedly at a very low level. I have to turn it way up to hear anything.

  • ssryan2 Jan 28, 2009

    I don't see any loose wires or bad solder. It is a really loud noise that starts when i power it up and lasts about 3 seconds. there is the initial click, then the buzz and then nothing. there should be another click i think.
    any help is appreciated.

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How old is this amplifier and pre-amp?

Posted on Feb 12, 2009

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Hi and welcome to FixYa,

The only possible source of the buzzing sound in a pre-amp would be relay(s). Since there are no high power components, this could either be a faulty relay trigger transistor or leaky capacitor either in the power supply circuit of the pre-amp or mainboard. It is also possible that other connectors could be loose and/or cold solder issues. Best approach would be to open the unit up for a look & see.

Good luck and thank you for using FixYa.

Posted on Jan 28, 2009

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Check you fuse resistance with an ohmeter. Also check for any loose or broken wires and solder pieces. It is possble you could have positive and negative wires on backwords in your speakers? I would check speaker wiring as well

Posted on Jan 28, 2009

  • Nate Stansfield
    Nate Stansfield Jan 28, 2009

    sounds like one of your resistors or transforemers have burnt out.

  • Nate Stansfield
    Nate Stansfield Jan 28, 2009

    the powersupply could be bad. when they start to go they usually send a higher voltage than they were designed to

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I find it some internal connections problem.just check is there any short tracking inside .

Posted on Jan 27, 2009

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Strip it andclean it with a old toothbrush and put it back 2 gether again

Posted on Jan 27, 2009

  • Claire Mc Cauley Jan 27, 2009

    strip it andclean it with a old toothbrush and put it back 2 gether again

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1 Answer

Mod 2245 marantz no sound right or left.


Hello,

Do you hear the relay click when you turn the unit on? If not you have a issue with one or both amps. If you do get a relay click, check your pre-amp out/main amp in connections on the back. You may want to also play with your controls, dirty controls can cause this condition as well. If you would like to have the unit serviced, check out my website, I have a lot of experience with the vintage Marantz units.

Thanks

Willie

www.back2lifeelectronics.com

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