I'm working on a Bally Midway's Black Pyramid and it's doing something very strange.
When I finally get the game to boot up and start a game, the ball eject will not kick the ball into the shooter lane, the left pop-bumper works fine, the right slingshot works fine, the right pop up-bumper triggers the left slingshot, the saucer (kick out) triggers the knocker and the left slingshot switches also fire the knocker????
I've re-flowed all off the connections and I'm waiting on parts to rebuild the Power board but this thing has me really stumped. I've checked all of my cables and connections (they seem correct) When I do the test on the coils they all fire in correct order as stated on the list in the manual. I've also replaced the driver transistor for the knocker because it stuck on and almost fried that coil.