After replacing a faulty relay on the solenoid expander (which brought the spinning wheel back) the pop bumpers keep firing on their own during the game, even with the skirt switches adjusted.
Pop bumpers fire nonstop after a solenoid expander swap: board jumper set wrong
Cause: The solenoid expander board was not configured for this game. Its jumper setting must match what the game uses; on Fireball Classic the 43 V jumper is believed not to be fitted.
Checks
- Rule out the skirt switches first by gapping them and watching switch test.
- Compare the jumpers on the expander with the original board or the game's manual.
Fix
- Set the expander's jumpers to match the original board for this game (see also the expander jumper tip for the wheel motor).
Systems
Games
Related tips
- Spinning wheel never turns in a game: faulty solenoid expander
- Fuse blows when the spinning wheel motor is connected: cut the expander jumper
- Bally -35: momentary solenoids all dead but fire when grounded: solenoid driver U3
- Coil in the drop target assembly is always on: burnt trace on the solenoid driver board
- Knocker fires instead of the outhole kicker: bad solenoid driver J4 connector
- Kickout coil burns up in attract mode: driver transistor, resistor and the CA3081 at U3
- Arcing between J3 pins on the solenoid driver board and displays out
- Solenoid expander relay buzzes or does not switch
Source: Pinball Repair help group!! (Facebook group)