fix two fried amps?

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i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 19, 2007 at 9:36 PM / IP Logged

I have worked on one of those MTX amps, it has been a long time. Is the status LED green for power and red for protect?

You need to check the Transistors and see if any are shorted.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 22, 2007 at 11:52 PM / IP Logged

I will wait till I fix this one before I get to the mtx but yes thats right.

Ok, I soldered in the 2 mosfet power supplies on the left and right. I also soldered in the 4 up top. Now I think Mouser sent me the wrong resistors, the ones on the amp read "101". the ones from mouser are "1000". Can you give me a direct link to them? These are the only thing I lack.

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 23, 2007 at 12:25 AM / IP Logged

Use an ohm meter to check them. They may be 100 ohms. The last number may be the multiplier. It would be 100 with 0 0's at the end.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 24, 2007 at 11:50 AM / IP Logged

Cool, for some reason I didnt even think of that, lol

Ok so I have everything soldered in. I have the bottom 2 (on each side) mosfets, the 100ohm resistors (2 on each side) and the 4 transistors located on the north side 355*. How should I test this? Also I tested the mosfets and I got a reading of 455+ on them. Is that normal?

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 24, 2007 at 2:23 PM / IP Logged

You replaced all 4 of the transistors north of the transformer? Do not turn the amp on untill you answer the preceeding question.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 24, 2007 at 3:48 PM / IP Logged

fix two fried amps? - Page 5 -- posted image.

I replaced all 4 of these.

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 24, 2007 at 4:14 PM / IP Logged

Do not try to turn the amp on. You were supposed to change only 2 of them. There are 2 NPNs and 2 PNP transistors. The NPNs rarely fail like 1 in every 100. The PNP transistors fail about 90 out of 100 times. When I go back to work Wednesday I will get you a part number so you can order the right ones.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 24, 2007 at 4:42 PM / IP Logged

I still have them! Where do they go?

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 24, 2007 at 4:46 PM / IP Logged

They are labeled from left to right: q4,q5,q1,q2

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 24, 2007 at 4:46 PM / IP Logged

You will have to re-read the thread and see which of the 2 you were supposed to replace. Then you will have to figure out which of the 2 went in the spot you were not supposed to replace. You will have to use a meter and figure out the 2 that are opposite of the ones that you bought.

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