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Skew 12th March 2011 03:11 AM

Amp repair question - MTX 1501D
I have an MTX 1501D amplifier that does not work. The amp has been used very little, and worked fine for me while I had it. I sold the amp to a friend, and he may have damaged it trying to install it and gave it back.

I opened the case and did not find any discolored or burnt components. Are there problems that usually occur with these amps, or any ideas on what to check? I am good with electronics but I do not have an oscilloscope. Any diagrams, guides, or advice would be very much appreciated.

Perry Babin 12th March 2011 03:58 AM

Is the older model or the newer model (with the LED display on it)?

Skew 12th March 2011 05:14 PM

There is a small LED on the top of the amplifier. I believe this LED turns on but no sound comes out of the subwoofers when everything is connected.

Perry Babin 13th March 2011 05:17 AM

Is LED238 lighting up inside the amp?

Skew 4th April 2011 05:20 PM

I do not believe LED238 lights up, but LEDs 399 (highlighted by green box) and the large 463 that shows from the outside near the MTX logo both light up when the 12V and REM terminals are supplied with 12 volts. There is also a faint high-pitched tone that the amplifier emits as soon as it is connected to power, followed by a low volume hissing and crackling sound that continues until power is disconnected. I have attached some pictures of the amplifier. Any help or advice would be great. Thank you.

Perry Babin 4th April 2011 07:31 PM


I do not believe LED238 lights up
That's not definitive. Check it again. It may take several seconds for it to light up.

Gunman 11th May 2011 04:55 AM

Hello, dear friends! I'm from Russia, sorry foe my english:)
I have a problem with me 1501, do You have a circuit diagram (basic electric scheme, circuit scheme or electrical scheme)? Or may be You can take pictures of the elements (parts) inside it so close, so I can see numbers and letters on all elements?

Perry Babin 11th May 2011 06:05 AM

Which parts do you need to see?

Gunman 11th May 2011 06:22 AM


Originally Posted by Perry Babin (
Which parts do you need to see?

all You can give to me :(
a half of an amp has burned:(
Can You help me?

Perry Babin 11th May 2011 06:48 AM

Post photos of the burned areas/parts.

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