I recently picked up a Williams 21 which is in really bad shape. I got it to turn on and a handful of lights on the back glass and on the play field light up. The machine is missing its coin door, however I think I found the correct wires to trigger the start of a game.
Whenever I do trigger the start of a game, the ball release coil energizes and releases the balls, and the back most relay which I believe is the game over relay stays on and buzzes. The only issue is none of the flippers work. Plus the score reels never reset either.
I think the machine is stuck in a state where it can’t finish the initial startup sequence due to something being in the wrong position. However, I can’t seem to find schematics anywhere for this machine to determine which items need to be reset to trigger the game to start.
Any help would be greatly appreciated!!