Problem: The track-ball intermittently loses control of the shooter.
Solution: If you have a game with PCB revision A-C, replace R130-R133 with
3.3k resistors. If you have a cocktail game with PCB revision A-C, you must
also replace R83-R86 with 3.3k resistors. If you have a game with PCB
revision D-F, replace R151-R154 with 3.3k resistors. If you have a cocktail
game with PCB revision D-F, you must also replace R143-R146 with 3.3k
resistors. For games with PCB revision G-J, these modifications have
already been made.