Question about MB Quart RAA1000 Car Audio Amplifier

2 Answers

Amp powers on, but stays in protect mode

Hi, I have a MBQuart RAA1000 mono amp, It powers on, but stays in protect mode. I have checked all the wiring and everything is fine. I have tried for almost 2 years to find a solution to this problem and cant seem to find a cause for this, or anyone that will fix an amp. If anyone has any idea what could cause this, please let me know. Also I feel I am a very technical person and would be comfortable fixing the amp myself if someone could point me in the right direction to get started. Thanks

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  • sneeedle Apr 18, 2008

    I took several pictures of the inside of the amp, along with a closer shot of a transistor I think may be bad? I have a multimeter, but not 100% sure im doing it right. The link to view the pictures is:
    http://myweb.usf.edu/~lmcgrego/amp_pics/

  • Anonymous Jan 29, 2009

    the protect light keeps going when i hit a small bump and sometimes it just doesnt go on. Sometimes both rights are never on and the amplifier isnt even working.

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Shorted output transistors are the most common reason for amplifiers to go into protect. How much do you know about electronics/electronic components?

If you're a newbie, read THIS page.

Would it be possible to send me a set of high quality photos of the amp's internals?

Posted on Apr 17, 2008

  • Perry Babin Apr 18, 2008

    sneeedle,



    That was my post (guest). I didn't realize that I wasn't logged in.

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In that group of transistors, measure the resistance from the center leg to the outer legs on each of the individual transistors. If you find any that read near 0 ohms, you need to remove them from the board and test them again. If they still read near 0 ohms, they're defective.

The SSP45N20B are difficult to find. The SSS45N20B should be a good substitute.

Posted on Apr 18, 2008

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Posted on Jan 02, 2017

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