1978 Gottlieb Gemini
Replay unit would decrement ALL credits on the credit wheel instead of just 1 credit on game start. I purchased this game out of Florida and it must have been operated by the beach based on the amount of rust on the mechanisms, with the credit unit no exception. While the unit’s themselves all look okay, the springs are all rusty and one broke on the credit unit. Quick check in the 1978 Gottlieb Parts Catalog revealed where the broken spring attached. Fortunately I had one in stock to replace the broken spring. Now credit unit only decrements 1 credit at a time as designed.
1972 Bally Fireball
Zipper Flippers not opening via mushroom bumpers or end of ball in play. Armature that allows flippers to open badly tweaked to compensate for an incorrect, underpowered, presumably in-the-field replacement coil. I did not have a correct coil so I decided to make this one work by tightening up the gap on the mb’s switches and associated relays. Now the flippers open as designed but would not stay closed. Uff Da.
I had to move the underpowered coil within the armature housing back to its previous position which allowed the flippers to stay in the closed position until mb’s or end of ball in play opened them. Now works as designed.