I have a 1979 Supersonic in great condition. The game powers up fine, but blows a fuse (#f4, 5v) when I hold the right flipper in for longer than a few seconds. I checked the manual to make sure I had the proper fuse inserted, I did, but would anyone recommend where to begin in solving the problem? I've read that poor-dirty soldering can result in shorts, but any advice on troubleshooting would be greatly appreciated! Thank you! -Alex