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Amp trips out over heating - Technics Audio & Video Receivers

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  • squirrel52 Oct 19, 2008

    hi robotek

    switch on, 2 records on radio shuts down, think fan is not working, feels pretty hot for such a short time, everything else works, tape, radio, cd, just the amp not working properly, running low volume

  • Graeme Ross
    Graeme Ross May 11, 2010

    Hi squirrel



    Can you tell me a bit more about what is happening when it is overheating, what circumstances cause it to over heat, how often it does it, what levels you are running it at. Cheers



    regards

    robotek

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  • 1,512 Answers

. Some models the fan only comes on when higher levels are employed, this generally to limit the fan noise from becoming background noise imposing on your listening pleasure. Who wants to here a fan going in quiet passages. The fan may well be faulty also. You will need to check to see that it is operating, and also not clogged up with dust (or cat hair is another common one)

I forgot to ask you what model the amp is, as some of the Technics range run rather hot due to class A output stages. But having said that, it should not be going into protection mode. It is highly likely that you have cracked/heat stressed solder joints about the output and or power regulator stages in the amp. The fact that it runs ok, then shuts down would point to this. The same dry solder joints could be causing the amp to overheat also, exacerbating the problem. Fault producing excessive heating of the output stages , that heat stresses stages causing more problems and the the ultimate killer of transistorised output stages, thermal runaway.

If you are able to solder well, I can talk you through resoldering the output stages, although it is really just that. resoldering anything that looks suspect. If you don't feel confident to do this yourself,a repair shop could do the work for you at a modest fee. Expect to pay for 1-1.5 hours of work to strip, resolder and soak test the amp. If the fan has failed, then add the cost of that too, as i can predict to you that if it has been running hot, then there WILL be some resoldering required anyway as preventative maintenance, allowing the tech to put a warranty on the repairs for you with confidence.

regards
robotek

Posted on Oct 20, 2008

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