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Old 5th March 2010, 09:01 PM   #21
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Spooney, I'm going to surprise you here but I have a MTX2300 thats broken in the exact same way as yours. Check the pics! Mine blew when the Eclipse Titanium sub I was driving popped its voice coil.
I'm no electrical engineer, I'm mechanical and my knowledge extends to knowing that a mosfet is a type of transister, and a transister is a high speed electrical switch. But, I can use a soldering iron and I really want my MTX back working! I blew it 5 years ago and the soundstream, although excellent, just isn't a ballsy.
Do you think you could guide me through it?

The three pictures show 1. Burned out resistors, 2. Swollen capacitor. 3. Two of the fets, fet 4 and fet 7, have holes burned in them.

Can you tell me what components you replaced, or how to check the transisters one by one? Any help would be greatly appreciated.
Jon
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File Type: jpg DSCN1468.JPG (168.6 KB, 125 views)
File Type: jpg DSCN1469.JPG (158.5 KB, 122 views)
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Old 6th March 2010, 12:02 AM   #22
spooney is offline spooney  United States
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I'd be happy to try and help you out. If you do a search in this forum for mtx thunder 2300 you will find quite a few threads with some very useful info as well. Can you get me a picture of the entire circuit board of your amp? Also curious to know if you have read Perry Babin's basic amp repair tutorial. It is a must read if you are going to attempt to fix this amp.
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Old 6th March 2010, 12:06 AM   #23
spooney is offline spooney  United States
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I was just looking at your pics and based on the date on the circuit board at least our circuit boards were produced on the same day. Crazy.
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Old 6th March 2010, 12:32 AM   #24
spooney is offline spooney  United States
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For starters in your first pic those burnt resistors are 22 ohm but I cant remember right this second the wattage rating of them. I think they were 1/4 watt but I believe I used 1/2 watt as replacements but it is going to be a pain to replace them as most likely at least one of the through holes has been completely burned out of the board. I had to solder one leg of the gate resistors into one of the through holes along with the gate leg for the ps fets. the four transistors to the right of those burned resistors are most likely defective as well. Not sure what the originals were but I know I used IRF3205 as a replacement in the power supply. Also I can see you need to replace all of the outputs in at least one of the channels(looks like the right channel?). The originals were IRF540. I used IRF540A as replacements with no issue and they may be easier to find than the IRF540 but either should be fine. Also expect to pull and either check or just completely replace all of the small transistors in that defective channel. Also there is two small driver transistors for the power supply that need to be checked/replaced(I think they are Q52 and Q53). I could ramble all night. Is any of this making any sense to you?

Last edited by spooney; 6th March 2010 at 12:49 AM.
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Old 6th March 2010, 12:43 AM   #25
spooney is offline spooney  United States
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Another thing to check would be the rca inputs. This series of amps was notorious for breaking the connections on the rca jacks where they go into the circuit board. Also if you know what they are check the legs of the rectifiers(the two heatsink mounted parts closest to the speaker inputs). These commonly fail as well.
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Old 6th March 2010, 04:19 AM   #26
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You might also wanna check the diodes in the right channel as i have a mtx 2300 im rebuilding right now. And all of the diodes (1n4150) were blown in the amp i have. Also i have it apart right now so if u need to know the values of any of the resistors. All i need is the board locations. And ill try to help u as well
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Old 6th March 2010, 09:08 AM   #27
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Right! Great response guys. I'm on it. I've attached some full shots of the circuitboard for you Spooney. And I've created an actions list for myself.
1. Search and read frelevant posts on MTX2300
2. Read Perry Babins basic amp repair tutorial
3. Replacement parts list
1. 2 x 22 ohm 1/2watt resistors
2. 4 transisters to right of burned resistors - IRF3205
3. Replace output fets - IRF540A
4. Replace all small transistors
5. replace driver transistors Q52 and Q53
6. Check RCA's are still soldered to board
7. Check rectifier legs
8. Check all of the diodes function.
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File Type: jpg DSCN1475.JPG (198.7 KB, 108 views)
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Old 6th March 2010, 08:18 PM   #28
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Quote:
Originally Posted by mike49504 View Post
You might also wanna check the diodes in the right channel as i have a mtx 2300 im rebuilding right now. And all of the diodes (1n4150) were blown in the amp i have. Also i have it apart right now so if u need to know the values of any of the resistors. All i need is the board locations. And ill try to help u as well
Cheers Mike, I might take you up on that, in fact, can you check the number of the small white boxed capacitor nect to RECT2? Mine is blown and reads 153J100 - I think.
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Old 6th March 2010, 08:33 PM   #29
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Well, I've started taking the amp apart, as the transisters I've measured are faulty if what I'm doing is right. I'm measuring across the transister legs and hoping to see very high resistance.
RECT 1 & 2 : The two Rectifier diode components (FEP16CT and FEN16CT)do have a 0.5V drop across them in the indicated direction so I assume they are good?

POWER SUPPLY
FET 9. 1-2=17OHM, 2-3=OPEN CIRCUIT, 1-3=OPEN CIRCUIT
FET 10. 1-2=21OHM, 2-3=146OHM, 1-3=167OHM
FET 11. 1-2=OPEN CIRCUIT, 2-3=OPEN CIRCUIT, 1-3=OPEN CIRCUIT
FET 12. 1-2=OPEN CIRCUIT, 2-3=OPEN CIRCUIT, 1-3=OPEN CIRCUIT

AUDIO RIGHT CHANNEL
FET 18. 1-2=OPEN CIRCUIT, 2-3=10MOHMS, 1-3,OPEN CIRCUIT

I've run out of time tonight so I'll keep checking tomorow. I'm enjoying this problem solving. Is that wrong?
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Old 7th March 2010, 12:05 AM   #30
spooney is offline spooney  United States
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if I remember correctly those white square capacitors read 123j100. At least on mine they were. They were .012 uF 100 volt caps i believe. If you can wait till tomorrow i will get you the exact number i ordered fr mouser.
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