Mtx Thunder 2300 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th September 2006, 11:01 PM   #1
vypr is offline vypr  United States
diyAudio Member
 
Join Date: Sep 2006
Default Mtx Thunder 2300

Hi im new here. i have a problem with an mtx thunder 2300 the power supply is shot and i think the mosfets are p50n06 im not too sure cause they was all cracked, but i cant find them anywhere, I emailed mtx for the schematic cause it needs a resistor too and i got no response.
If you guys know of any replacements for the power mosfets in the power supply please tell me any help will be greatly appreciated, oh and if anybody has the schematics for that amplifier please send it to mikelee3@atlanticbb.net

Thanks and I appreciate it,
Mike
  Reply With Quote
Old 5th September 2006, 11:24 PM   #2
diyAudio Member
 
Join Date: Dec 2005
Location: Northern California
The gate resistors are either 68 or 75 ohm metal film resistors. The fets vary as I have seen from 50n06's to 60n06's, I use 75 ampere rated replacements from Intersil.
The 50n06's are listed on e-bay, but the seller believes they are made of gold by his price for them. $3.25 each + shipping
you can use just about any mosfet as long as it is rated at or above the current demand of the old ones.
If this seems fresh I just repaired a four channel MTX yesterday. Don't be suprised if a rectifier chip on the secondary side is blow also, or possible a blown output or two.
Generally speaking the power supply usually does not fail for no reason, so look around on the other side of the toroid for other issues leading to this failure.

Good luck, hope this info helps.....
  Reply With Quote
Old 6th September 2006, 12:45 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
There were a couple of versions. If the amp is like the one in the attached image, the value is 22 ohms.

I use IRF3205s as replacements for the power supply FETs.

If it has 4 power supply FETs on one side of the amp and the two rectifiers on the opposite side of the board, check the legs on the rectifiers to make sure that they're not broken. This was a very common failure.

The amps with power supply FETs on both sides of the board (6 FETs) were more reliable and had a lower incidence of broken leads on the components.

As justonemoreamp mentioned, the outputs have likely failed. Even if you don't find any failed outputs, when you initially power up the amp, do so through a current limiter. If you don't have a limiter, power it up through a 10 amp fuse. Also make sure that you have the transistors clamped down before applying power. Components can fail within seconds if there are more problems.
Attached Images
File Type: jpg mtxresistors22ohm.jpg (98.6 KB, 373 views)
  Reply With Quote
Old 6th September 2006, 01:13 AM   #4
diyAudio Member
 
Join Date: Dec 2005
Location: Northern California
On the mtx I restored yesterday a FEP16CT dual rectifier diode had failed. So it dead shorted the amp internally.
So follow Perry's recommendations about fusing and or limiter usage.
His selection of the 3205 fet is also fine, and they can be found on e-bay for 79 cents each just type the number in the ebay search bar it will come right up with at least 5 listings from Activeparts. Tom is a good supplier of fets and other devices.

Hope this is found helpful
  Reply With Quote
Old 6th September 2006, 05:41 AM   #5
vypr is offline vypr  United States
diyAudio Member
 
Join Date: Sep 2006
Hi,
hey sorry for the poor picture its from my phone the 2 resistors i need are r171 and r172 i ohmed them and they both are 19 ohms 1/4 watt i have half watt 22 ohm here will those work? oh and i checked the rectifiers and they checked good and made sure i soldered them in good the resistors are in the pic they are the 2 between the ground screw you shold be able to see them where i took them out cause they was black i am gonna order so irf540s for the outputs ill get a few of them just in case and a few of irf3205s for the power supply. the amplifier blew up when one of the subs it was driving locked up then it just kept blowing fuses i tool it apart and all 4 power supply mosfets was cracked and 2 outputs were cracked. If you guys think of any other things i should look at feel free to respond
Thanks a Million you helped me out alot
Mike
Attached Images
File Type: jpg untitled1.jpg (50.3 KB, 306 views)
  Reply With Quote
Old 6th September 2006, 05:41 AM   #6
vypr is offline vypr  United States
diyAudio Member
 
Join Date: Sep 2006
heres one more picture i dont know if it is any better

Thanks again
Attached Images
File Type: jpg untitled2.jpg (61.8 KB, 298 views)
  Reply With Quote
Old 6th September 2006, 05:41 AM   #7
vypr is offline vypr  United States
diyAudio Member
 
Join Date: Sep 2006
lol thats the same ones as in the pic .....thanks perry disregard my pics then
  Reply With Quote
Old 6th September 2006, 12:32 PM   #8
djQUAN is offline djQUAN  Philippines
diyAudio Member
 
Join Date: May 2004
Location: manila
Send a message via MSN to djQUAN Send a message via Yahoo to djQUAN
at first power up, a good idea for a simple limiter is a 60w car headlight. I use it all the time. wire it in series with the positive supply to the amp.

it allows enough current to do some low power testing or checking if the amp has an audio output. when something is wrong, the bulb will glow and limit current to the amp.
  Reply With Quote
Old 6th September 2006, 12:34 PM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If you have outputs that are cracked, they have most definitely failed. This means that you MUST replace all 4 that were in parallel with the cracked FETs. I'd strongly recommend that you replace all 8 outputs in that channel. They were all subjected to the same abuse and if they haven't outright failed, they may be weakened.

Check the 0.1 ohm 2 watt resistors near the outputs. You should remove them and check them out of the board if any are discolored.

When ordering parts, I'd suggest that you order a few each of the MPSW42 and MPSW92 transistors. If I'm not mistaken, these are used as the drivers for the outputs.

The 1/2 watt 22 ohm resistors will work but you may as well order the correct resistor since you have to the order the other parts. I'd recommend a flameproof resistor. If you don't use flameproof resistors, mount the resistor ~1/4" from the board to prevent further damage to the board (if the amp fails again).
  Reply With Quote
Old 6th September 2006, 08:35 PM   #10
vypr is offline vypr  United States
diyAudio Member
 
Join Date: Sep 2006
ok the only mpsw's i could find was the mpsw92 their a little larger and there is only 2 on each channel and there is smaller mps6523 2 connected to the heatsink when they are clamped down all 4 checked good with my fluke, ok this is odd i looked under the .1 ohm 2 watt resistors on the side that has the cracked mosfets and no black where they are connected to the board but on the other side where none are cracked 3 .1 ohm resistors have black around the solder connection should i desolder it clean it up and resolder it? , oh i also found a few mpsa06 there was others it looks like they are behind the mosfets in pairs, can i check them in circuit because there is alot of them.
Thanks Your help is Greatly Appreciated,
Mike
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sherwood S 2300 FET tuner sewerwisp Solid State 2 9th January 2010 01:20 AM
Help! Logitech z-2300 ckim8 Multi-Way 0 27th December 2008 09:20 PM
ppi 2300.2 broken MIKETRU Car Audio 45 7th September 2008 11:49 PM
Building own satellites for z-2300 fruitbooter Multi-Way 1 16th February 2008 05:32 AM


New To Site? Need Help?

All times are GMT. The time now is 05:57 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2