Hi guys. Working on a Thunder 2301. It has a SMD transistor marked 1GM that puffs smoke every time I apply the remote. ??? What is a 1GM and have you seen this before?
Thanks,
Roger
Thanks,
Roger
The SMD Code Book
MMBTA06
If no one can answer your question, post a photo of the entire board and another of the area with the burns.
MMBTA06
If no one can answer your question, post a photo of the entire board and another of the area with the burns.
I have an amp here with the same transistor blown. It may take a day or two to study the circuit. If someone has a diagram for it, please post it.
The following is from a 5601. It should be similar to your amp. I can't see how that transistor could burn, even though the one in this amp has also failed. I don't see any other failed components. You can right-click to zoom in on the photos.
http://www.bcae1.com/temp/mtx5601overcurrentprotection01.swf
http://www.bcae1.com/temp/mtx5601overcurrentprotection01.swf
I agree. There seems to be no reason for it to cook. I had a thought, though. This one came in with the 2 voltage regulators on the heatsink fried. One was a 317T. The other was melted to the point that I couldn't read it. Do you think it could have been different and using a 317 is causing the problem? I ordered a new transistor that will be here today. I will replace it tonight and see what happens.
I hadn't thought of that. DOH! But I can't see where that would burn the transistor. Does the board you have use a 317 and a 337?
Okay. I'm going to put a 337 in place of the one that cooked and replace the transistor that burned. Let you know how it turns out. Thanks a bunch!
I don't have anything on the 2301. Before ordering the part, look up the datasheet and confirm that the input, output and adjust correspond to those on the 337.
Well it turns out that it was suppose to be an LM337T. I replaced it and the transistor that cooked. Powered it up and another SMD transistor fried. I believe the owner is going to call it a wash on this one. But, just to try, I've emailed MTX to inquire about a schematic. Not much hope for that happening, though.
Which other transistor failed?
If you're successful in getting a diagram from MTX, you'll be the first. When working on car amps, you have to expect not to be able to get diagrams except from Rockford and the Japanese manufacturers.
If you're successful in getting a diagram from MTX, you'll be the first. When working on car amps, you have to expect not to be able to get diagrams except from Rockford and the Japanese manufacturers.
The transistor that failed is on the opposite side of the board. I will shoot a picture of it, this evening.
I wasn't expecting a response from MTX. But I figured it wouldn't hurt to send an email. I really never expect to find much in in the line of documentation on anything 12 volt. It's sad that a company can build a product but not provide support information for it. But that's another thread, I guess.
I wasn't expecting a response from MTX. But I figured it wouldn't hurt to send an email. I really never expect to find much in in the line of documentation on anything 12 volt. It's sad that a company can build a product but not provide support information for it. But that's another thread, I guess.
