There's plenty of people that would like to help you out there, and most of them are technically inclined.
Another good site is basementarcade.com. There is a huge assortment of schematics and manuals available for arcade machines. http://www.basementarcade.com/arcade/library/index.html (scroll down for the schematics/manuals). Another thing to keep in mind is that most of the arcade machines manufactured in the 80's used similar hardware, and the parts are relatively easy to find. If you find yourself needing something, Bob roberts is the man to go to (http://www.therealbobroberts.com/).
I'm in the process of ressurecting a pac man machine myself. Maybe there is something I can help you with?
anyway, i'm having trouble locating the key for the back of the cabinet, so i can't really get in there and see what's going on yet. i'm probably going to cut it out and get a new lock since i think finding the key is pretty hopeless.