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I have a MG50FX and almosto every time I play, I can play for about two or three minutes, then the sound gradually faints. after a while of playing on and off with the power switch, it comes to life again....for another two or theree minutes...ando so onWhat can I do?

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  • Music Master
  • 3,156 Answers

You need to take it into the shop for internal repair. Don't attempt to do it yourself for fear of shock.

Posted on May 28, 2018

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Posted on Jan 02, 2017

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user262

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SOURCE: Marshall MB4410 - Dies and comes back to life every few minutes..

Our bassplayer had the same problem with his mb4410. As it turned out, the fan was not working when the amp got hot. It did turn when cold - go figure! Swap the fan for a good quality (Pabst, Sunon) 80mm pc fan with 2-wire connection. Three or four wire fans will not work w/out modding. See your local pc guy and ask for an unregulated, silent 24/7 fans. He will know. Our bassplayer sold the P.O.S. while still in warranty. HTH.

Posted on Sep 07, 2010

Testimonial: "Thanks for the reply."

Fred Yearian

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SOURCE: FM 65R plays and sounds

Also the volume will probably be lower going into the line level PA input... If the amp is shutting down for thermal reasons, driving it less might not get to the point of shutdown. The schematic shows a temp sensor that reduces and shuts down the amp if the heatsinks get to hot. Possibly you are driving the amp harder than it is intended, If it is as loud (I doubt it) driving the PA input, then I would expect it to shutdown, but you would probably have to drive it harder than your guitar because guitar levels are well below line level. The amp claims 65 watts... don't believe everything you read in spec sheets... You should be able to generate 100 Db of sound with it... The more distortion you use will drive the amp harder and heat the heatsinks faster.

Posted on May 13, 2011

markmayes66

mark mayes

  • 786 Answers

SOURCE: Fender power chorus .

Sounds like a resister is bad..

Posted on Aug 16, 2012

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