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    Repairing an MTX TE1501d

    My buddy wants me to fix this amp for him...I have good enough skills with a soldering iron, but no skills with electrical components. I don't know how to test transistors, resistors, etc. I have a radioshack dmm to work with.

    He told me that the amp went up in smoke on him, and sure enough, there were 5 roasted transistors inside. They are 75339p transistors. It doesn't appear that they blew up the surrounding resistors, but I know that looks can be deceiving.

    My question: What else on the board should I check to see if it's blown, how do I check them, and what should I replace the bad transistors with?









    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior




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    Re: Repairing an MTX TE1501d

    you should replace them with 75339p transistors. LOL




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    Re: Repairing an MTX TE1501d

    set your meter on ohms and check the reading on those 5 resistors right inline with the fets. make sure they all read the same.




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    Re: Repairing an MTX TE1501d

    also check those insulators for damage , if the new fet's ground out because of a bad insulator you will be buying more fets.




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    Re: Repairing an MTX TE1501d

    After I cleaned the top side:




    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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    Re: Repairing an MTX TE1501d

    why is it missing caps? 2 large ones are missing from the board , yet the board is clearly marked for them.




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    Re: Repairing an MTX TE1501d

    Quote Originally Posted by Bassin Buick View Post
    also check those insulators for damage , if the new fet's ground out because of a bad insulator you will be buying more fets.
    The reason I asked which fets to replace them with is because sometimes there are different fets that will do the same job but are more reliable/cheaper/easier to find.

    I will go check the resistors now.

    What are the insulators?

    ---------- Post added at 10:38 PM ---------- Previous post was at 10:37 PM ----------

    Quote Originally Posted by Bassin Buick View Post
    why is it missing caps? 2 large ones are missing from the board , yet the board is clearly marked for them.
    Like MMats, they use the same chassis and different boards for that specific line of amps.



    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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    Re: Repairing an MTX TE1501d

    Quote Originally Posted by Suicide Bobb View Post
    The reason I asked which fets to replace them with is because sometimes there are different fets that will do the same job but are more reliable/cheaper/easier to find.

    I will go check the resistors now.

    What are the insulators?

    ---------- Post added at 10:38 PM ---------- Previous post was at 10:37 PM ----------



    Like MMats, they use the same chassis and different boards for that specific line of amps.
    the pieces of what looks like medical tape covered in thermal compound , it seperates the backs of the fet's from the metal heatsink , allows heat transfer without grounding the fets.




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    Re: Repairing an MTX TE1501d

    All resistors around the fets read 10.5

    ---------- Post added at 10:44 PM ---------- Previous post was at 10:43 PM ----------

    Quote Originally Posted by Bassin Buick View Post
    the pieces of what looks like medical tape covered in thermal compound , it seperates the backs of the fet's from the metal heatsink , allows heat transfer without grounding the fets.
    OH

    What should I replace them with that is easy to get ahold of?



    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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    Re: Repairing an MTX TE1501d

    Quote Originally Posted by Suicide Bobb View Post
    All resistors around the fets read 10.5

    ---------- Post added at 10:44 PM ---------- Previous post was at 10:43 PM ----------



    OH

    What should I replace them with that is easy to get ahold of?
    just inspect them for burnthough or slices from too much mounting pressure. If you cant see any rips or holes they should be fine.




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    Re: Repairing an MTX TE1501d

    Quote Originally Posted by Bassin Buick View Post
    just inspect them for burnthough or slices from too much mounting pressure. If you cant see any rips or holes they should be fine.
    Oh alright.

    So if the resistors measure normal and the insulators are fine, all I need to do is replace the fets? I heard in a different forum that I also need to readjust the bias afterwards...



    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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    Re: Repairing an MTX TE1501d

    probably do , i never thought of that , could be why my usacoustics has a turn on pop in the channel i repaired. Hmm??? you got me thinkng i may check all of my amps now , it made a HUGE sq difference in my home reciever.




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    Re: Repairing an MTX TE1501d

    I'm having a helluva time finding those transistors...on this site, I believe it's saying that the HUF75339P3 is a suitable replacement: 75339P datasheet, Pinout ,application circuits 75A, 55V, 0.012 Ohm, N-Channel UltraFET Power MOSFETs



    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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    Re: Repairing an MTX TE1501d

    just thought of something , thats the power supply section you are working on not the output section. bias shouldnt need touched.

    ---------- Post added at 01:53 AM ---------- Previous post was at 01:52 AM ----------

    try the cross reference dealy on parts express




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    Re: Repairing an MTX TE1501d




    Quote Originally Posted by benbenondatrack View Post
    when i see small subs i just think of a girl, 12s = teenagers, 15s = man, 18 = King Kong Mandingo Warrior

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