Well after that little setback I decided to borrow the Alltek MPU from my Stern Stingray to see this game up and running for the first time in who knows how many years. Booted up straight away but had a continuous tone coming from the speaker, which I eventually worked out was the sound circuit that generates the falling pitch sound when the ball hits the bumper on most of these boards/games, ended up being a 0.1uF cap (C10) on the sound board causing the problem.
By this stage most of the game was working, except for a couple of solenoids. I had the game in solenoid test going over the board with the logic probe, when the power transformer board started to arc up and smoke poured out of it.. not good! After that I had no feature lamps and no displays.
If you look at the 3rd pic of the damage, it had arced up between the fuse holder for the display circuit (and blew the fuse) and the ground track for the bridge for the feature lamps. Once again I decided to repair this board just for originality sake, and because it was my own game (id have replaced the board for a customers pin). I cleaned up as much of the carboned up mess as I could with my Dremel, and cut away completely the ground track for the bridge. Instead of reinserting the ground lead of the bridge back into the board I placed a couple of layers of heatshrink over it and resoldered it to the top of the board, right away from the hv fuse and the burnt area. Last pic shows the bridge ready to go back in.
