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Problem for MTX Thunder 4250D Car Audio Amplifier

Mtx amp thunder 4250d blow the fuses

By maab_92231 on Feb 16, 2009

" "

I check the fets and I think they are in short but I can`t find the fet, the number is FB42N20D and MUR1620C and 75339P,
can somebody help me to find them?

Comments:

Feb 17, 2009

- thank you pbabin. you are right the MUR1620C appear be in good condition, but the 75339p apper be in short I thing this is why the fuses blow up, when I install the new mosfet 75339p I will can recheck the amplifier and I will add a comment about this, and another thing this problem is common in this amplifier?

Feb 23, 2009

- thank pbabin for your information I fund it very useful.

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Clarification Request

Posted by pbabin on Feb 17, 2009

If the amp blows fuses only after the remote voltage is applied, the problem is generally shorted output transistors (IRFB42N20D in this amp?). Shorted outputs can cause the power supply FETs (75339s) to fail. Before you power it up, read through the following page (or at least the information in the yellow box).

Amplifier Repair Primer

Posted by pbabin on Feb 16, 2009

http://octopart.com/search?q=IRFB42N20D

http://octopart.com/search?q=huf75339p

The MUR1620 rectifier isn't likely to be defective.

email me if you need help.
babin_perry@yahoo.com

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