mtx 300xd help

mjrpainless · 3rd January 2009, 10:01 AM

I recently bought a MTX 300xd Amp but it doesnt put out any sound.

I have oppened it up, doesnt look to be any burn marks, or anything of that sort. So i pull all the mosfets off, and the rectifier. Tested them all, and they all check out.

Not to sure of any history on the amp. any suggestions would be greatly appreciated.

Thanks

Perry Babin · 3rd January 2009, 11:04 AM

With all of the components in the circuit was it producing rail or regulated voltage?

Can you post (or email me) at least one photo of the inside of the amp?

babin_perry@yahoo.com

mjrpainless · 3rd January 2009, 06:50 PM

here is a photo of the amp, i will also send one to the email you provided.

I didnt check the voltages, where would i check them from?

Also i dont know if it would matter but im kinda of using a micky mouse set up. I bought a ac-dc converter, but its only rated at 8.5 amps.

My thinking is that it SHOULD work, as im not looking to produce large amounts of sound. Just so that i know if its functioning.

Also just off to the right of D3 there are exposed copper tracings, NOT sure if that would be a problem

1moreamp · 3rd January 2009, 07:33 PM

LOL LOL It does not put out any sound cause there are NO power devices mounted to the board on the far side. Not one output or even a power supply fet are left in that amp.

That is why your amp is not working. its been stripped of all of it power devices.

I Am An Idiot · 3rd January 2009, 08:00 PM

Quote:

Originally posted by mjrpainless
So i pull all the mosfets off, and the rectifier. Tested them all, and they all check out.

1moreamp · 3rd January 2009, 09:36 PM

LOL LOL well it won't work till he puts them all back now that is for sure...

mjrpainless · 4th January 2009, 01:18 AM

.......thanks......if ya read the original post I pulled them off and tested them......any other ideas?

mjrpainless · 4th January 2009, 01:18 AM

it was broken, there was no sound output or dc voltage comming out.

I Am An Idiot · 4th January 2009, 02:22 AM

He was asking about the + & - voltage supplying voltage to the output transistors. And also the + & - 15 volts on the op-amps in the preamp section. Neither of these "Come Out" of the amplifier.

3rd January 2009, 10:01 AM	#1
mjrpainless diyAudio Member Join Date: Jan 2009	mtx 300xd help I recently bought a MTX 300xd Amp but it doesnt put out any sound. I have oppened it up, doesnt look to be any burn marks, or anything of that sort. So i pull all the mosfets off, and the rectifier. Tested them all, and they all check out. Not to sure of any history on the amp. any suggestions would be greatly appreciated. Thanks

3rd January 2009, 11:04 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With all of the components in the circuit was it producing rail or regulated voltage? Can you post (or email me) at least one photo of the inside of the amp? babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

4th January 2009, 02:22 AM	#9
I Am An Idiot diyAudio Member Join Date: Mar 2007	He was asking about the + & - voltage supplying voltage to the output transistors. And also the + & - 15 volts on the op-amps in the preamp section. Neither of these "Come Out" of the amplifier. __________________ If it ain't broke Don't fix it

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3rd January 2009, 06:50 PM	#3
mjrpainless diyAudio Member Join Date: Jan 2009	here is a photo of the amp, i will also send one to the email you provided. I didnt check the voltages, where would i check them from? Also i dont know if it would matter but im kinda of using a micky mouse set up. I bought a ac-dc converter, but its only rated at 8.5 amps. My thinking is that it SHOULD work, as im not looking to produce large amounts of sound. Just so that i know if its functioning. Also just off to the right of D3 there are exposed copper tracings, NOT sure if that would be a problem

3rd January 2009, 07:33 PM	#4
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	LOL LOL It does not put out any sound cause there are NO power devices mounted to the board on the far side. Not one output or even a power supply fet are left in that amp. That is why your amp is not working. its been stripped of all of it power devices.

3rd January 2009, 09:36 PM	#6
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	LOL LOL well it won't work till he puts them all back now that is for sure...

4th January 2009, 01:18 AM	#7
mjrpainless diyAudio Member Join Date: Jan 2009	.......thanks......if ya read the original post I pulled them off and tested them......any other ideas?

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