MTX 7801 repair

xradeon · 4th May 2011, 08:04 PM

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.

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

Thanks!

Perry Babin · 4th May 2011, 09:52 PM

The resistors are 39.2 ohms. The caps are probably OK.

xradeon · 5th May 2011, 04:56 AM

Thanks for the quick answer Perry!

sultanes · 31st December 2011, 04:54 AM

repair the problem, I have the same amplifier and was the same as yours.
??????????????????

4th May 2011, 08:04 PM	#1
xradeon diyAudio Member Join Date: May 2011 Location: México City	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. All 10 ohm resistors from fets are open. Do I need to change C116 and C117 caps too?? Anything else I should check? Thanks!

4th May 2011, 09:52 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The resistors are 39.2 ohms. The caps are probably OK. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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5th May 2011, 04:56 AM	#3
xradeon diyAudio Member Join Date: May 2011 Location: México City	Thanks for the quick answer Perry!

31st December 2011, 04:54 AM	#4
sultanes diyAudio Member Join Date: Sep 2011	repair the problem, I have the same amplifier and was the same as yours. ??????????????????

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