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Old 4th May 2011, 08:04 PM   #1
xradeon is offline xradeon  Mexico
diyAudio Member
Join Date: May 2011
Location: México City
Default MTX 7801 repair

Hi! I need some help with my MTX 7801 class D amp.

The other day it blew off all the 75339P fets. I've 10 of them to replace. The problem is that I can't read the value of R114 and R115 which I suppouse are the same. Here's a pic of the board.

Click the image to open in full size.

All 10 ohm resistors from fets are open. Do I need to change C116 and C117 caps too?? Anything else I should check?

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Old 4th May 2011, 09:52 PM   #2
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
The resistors are 39.2 ohms. The caps are probably OK.
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Old 5th May 2011, 04:56 AM   #3
xradeon is offline xradeon  Mexico
diyAudio Member
Join Date: May 2011
Location: México City
Thanks for the quick answer Perry!
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Old 31st December 2011, 04:54 AM   #4
diyAudio Member
Join Date: Sep 2011
repair the problem, I have the same amplifier and was the same as yours.
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