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Old 6th December 2009, 09:26 PM   #1
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Default mtx amp not working

mtx 7801 thunder amp d class humming loud noise weather rca signal input are hooked up or not need help what too repair
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Old 6th December 2009, 10:51 PM   #2
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Moved to car audio. Troubleshooting is for forum related problems.
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Old 6th December 2009, 11:28 PM   #3
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Before you do anything...
* You MUST have the transistors clamped tightly to the heatsink when the amp is powered up.

* You should also insert a 15 amp fuse in the B+ line feeding the amp to help protect it if there is a problem (or accident) that causes excessive current draw.

* When probing any points with a meter or scope, be VERY careful not to let the probe slip and short between adjacent pins.



Do you have a multimeter or an oscilloscope?

Remove the top cover (screws on bottom around perimeter -- leave the ones in the center) and unplug the preamp board from the main board. Does it still make noise when powered up?
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