Rockford Fosgate replacement fets

A few years back a friend brought me 2 of his Fosgate amps. One was a

40i or something like that and the other was a 200DSM or some such thing (it's been a while since I looked at the docs I have). Anyway, I emailed the company and they sent me the pdf files of the schematics. Just in case the file I have for the 40i is the same as what you might need I can always email it to you if you wish. Getting the transistors off those rails was actually quite easy. I recall just removing a few screws and then the whole rail would pull away from the transistors and you could handle them with a regular 32W iron quite easily.

Cheers, Lawrence

That's great news. I figured with it being designed to dissipate heat the whole rail would suck the heat away. I'll have to give it a shot. I'll have to email them and see if they'll email it to me.

Thanks, Steve

I looked at the picture and although I don't work on car amps anymore, I remember ones that looked like this used a big aluminum bar laid across the transistors and screwed down on top of them to secure them down.

Having said that, I would cut the transistor leads and pull them out individually while heating with a soldering iron. You'll need the main board out, of course...

Mark Z.

Most of the amps I've worked on work just like how you stated. On this one, however, they solder the tabs of the transistors to the board. You can see the extra pads on the side on the four corners. They state it helps dissipate the heat beter than the traditional clamp down bar on top. I have no idea which is better.

Thanks, Steve