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Old 15th January 2008, 07:09 AM   #1
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Default Mtx Amp 100

I recently acquired an MTX AMP 100 subwoofer and it has a loud buzzing sound when powered up. Does anyone know where I could get a schematic and possible trouble-shooting help with this. The circuit board is labeled SUNBOW SP-600.

Any help would be greatly appreciated.
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Old 16th August 2008, 02:23 AM   #2
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Default MTX Amp 100

Hi,
Did you ever get this fixed. I have the same problem, and cant find any help.
Thanks
Robert
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Old 2nd February 2009, 09:55 PM   #3
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It appears my sub just started doing the same thing. It still works but obviously there is a short in the circuit board or something that is causing the hummmm or buzzzzz.

Any thoughts/help/advice???

Thanks
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Old 10th September 2013, 07:19 PM   #4
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I just got one to fix with the same problem, I need to know the value of Di04, and Di03, I will share infomation as I progress.Thanks
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Old 11th February 2015, 10:13 PM   #5
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Location: Indiana
Quote:
Originally Posted by AgentGx44 View Post
I just got one to fix with the same problem, I need to know the value of Di04, and Di03, I will share infomation as I progress.Thanks

I know this is an old post, but I am dealing with the same power amp myself.

D103 / D104 are Zener diodes P/N 1N4744a which is a 15 volt, 1 watt. They seem to run very hot as my board is roasted in this area. The resistors next door are 1.7K.

Any luck with your unit? Mine had roasted PS caps, power amp is coming up, but only have audio briefly when the power supply drains off. So I am looking in the same area and at the preamp stage.
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