Not sure if I'd break down technical help so far....(software problems, display problems, sound problems, etc)...seems like there will be some overlap, and some problems are misleading. (For example, I had a Twilight Zone with a "Sound Board Interface Error" that had nothing to do with the sound board).
If you have to break down the tech help sections, I would suggest to do it by era (DMD, Alphanumeric, early 80's solid state, etc etc).
Maybe create a spot for people to throw all of their "Game X Owners Club" posts, too.
Manufacturers: At some point, you just need a generic "Other Manufacturers" section that can be used for anyone new that pops up.
Otherwise, I'm kind of with The_Gorilla. Don't mess with stuff too much...it's already pretty awesome.