MTX 2300 X

mike49504 · 10th November 2010, 12:08 AM

Im in the process of bringing this amp back to life. The modle i have is the 2300x Black heatsink with gold lettering.

I have a couple questions

Wondering what is a good power supply fet for this amp?? Since the fets are missing.

There is a resistor thats to burnt to tell the value wondering if anyone knows the value of R429 located in front of the rectifier.

And what transistor goes in Q220's spot since its missing

Dr Zeus · 10th November 2010, 01:05 AM

This is an image from an MTX Thunder 4320. Perhaps is close to what you are missing?

The resistor on mine is 2k ohms.

Perry Babin · 10th November 2010, 06:41 AM

Does the amp have both rectifiers together or does it have one on each side?

mike49504 · 10th November 2010, 02:28 PM

Amp has 1 on each side.

Perry Babin · 10th November 2010, 02:34 PM

The photo I have isn't too very good but it appears that Q220 is an MPSA42. Since the circuit board designations are under the components, I can't tell which is R429. Look at the photos.

mike49504 · 03:15 PM

The resistor thats missing in mine is the 1 closet to the cap in the row with 4 resistors. It looks like a 22.1 ohm resistor from what i can see is this correct?

Also i have another 2300 amp but the board is totally different.

The one im repairing is the 2300x and the other one i have is a thunder 2300 is there a difference in output of theese amps or about the same?

Perry Babin · 10th November 2010, 03:17 PM

The ones closest to the caps are 22.1 ohms.

The power output is essentially the same (as far as I know) but the one with the 6 power supply FETs is probably more reliable. Most have labels on the back of them that give the power ratings.

mike49504 · 10th November 2010, 03:27 PM

I also noticed this amp has the same problems as the other 2300 i have,The 1N4148 diodes by the output transistors are shorted is this a common problem when the outputs go?

Also im gonna be fixing alot of problems in the output section since i found someone tryed repairing this amp themselfs and had 540's on 1 side for the outputs and irfz48's on the other side , Gotta love it

Perry Babin · 10th November 2010, 03:31 PM

Are you sure that they're 1N4148s?

mike49504 · 10th November 2010, 03:40 PM

Ok maybe i was wrong . I cant make out 1 of the numbers on it .

It says 1N4150 or 1N4450 do either of thoose sound familar?

10th November 2010, 12:08 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	MTX 2300 X Im in the process of bringing this amp back to life. The modle i have is the 2300x Black heatsink with gold lettering. I have a couple questions Wondering what is a good power supply fet for this amp?? Since the fets are missing. There is a resistor thats to burnt to tell the value wondering if anyone knows the value of R429 located in front of the rectifier. And what transistor goes in Q220's spot since its missing

10th November 2010, 06:41 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the amp have both rectifiers together or does it have one on each side? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th November 2010, 03:17 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The ones closest to the caps are 22.1 ohms. The power output is essentially the same (as far as I know) but the one with the 6 power supply FETs is probably more reliable. Most have labels on the back of them that give the power ratings. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th November 2010, 03:31 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure that they're 1N4148s? __________________ 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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10th November 2010, 01:05 AM	#2
Dr Zeus diyAudio Member Join Date: Oct 2010	This is an image from an MTX Thunder 4320. Perhaps is close to what you are missing? The resistor on mine is 2k ohms.

10th November 2010, 02:28 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	Amp has 1 on each side.

10th November 2010, 03:27 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	I also noticed this amp has the same problems as the other 2300 i have,The 1N4148 diodes by the output transistors are shorted is this a common problem when the outputs go? Also im gonna be fixing alot of problems in the output section since i found someone tryed repairing this amp themselfs and had 540's on 1 side for the outputs and irfz48's on the other side , Gotta love it

10th November 2010, 03:40 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok maybe i was wrong . I cant make out 1 of the numbers on it . It says 1N4150 or 1N4450 do either of thoose sound familar?

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