I acquired a FBC not to long ago and just got around to shopping it out and getting it running again. It looks very nice and seems to be playing fine but there is one thing I'm curious about. There is a pulsating type of background sound that plays constantly, even in attract mode - very annoying. Is this normal? I wouldn't think it was supposed to play in attract mode. If so, is there anyway to turn it off? I have found the service bulletin about dip switch 30 but it does not seem to make a difference. Any suggestions?

Ok, thanks. I will check those this evening and see what I find.

Yes it is the "Wha wha wha" background sound that is supposed to play during the game.

Upon closer inspection, after taking the board out to examine the headers, it appears that the cap at C10 is bad. Could that possibly be the culprit of the constant background sound?

Well, I replaced C10 and C22 because I read that C22 is also on the unregulated 12V supply and has a tendency to go bad or explode. C22 did seem to be shorted when I tested it. I figured I would give it a whirl in the machine to make sure it was still functioning as good or better than it was before I replaced those. Lo and behold, replacing those two caps seems to have fixed the constant background noise. Yahoo! Thanks for everyones help.