Quoted from Mistermoberg:
Issue with the ball kicker immediately where a ball drains. It constantly fires. Obviously can’t play a game like that. Looked at the switch, it seems fine. Wiring is nice and tight. What would typically cause this?
Do you mean that when you turn the machine on without a ball sitting there it fires? If it fires and re-fires, it's the switch or something related to it - if it fires and stays locked on, it's likely something with a driver transistor for the outhole coil.
If you mean it continuously fires after it activates, moving the ball over, but then continuously firing, it's likely a switch adjustment.