One pop bumper coil never energizes.
A pop bumper never fires
Cause: A blown under-playfield fuse, a misadjusted cup switch, an open coil or bad diode, or a failed pop bumper driver board.
Checks
- Check the fuses under the playfield.
- Adjust the pop bumper cup switch: it must rest open and close then reopen when the skirt is hit.
- Check the coil and its diode.
Fix
- Replace the pop bumper driver board under the playfield if the rest is good.
Systems
Related tips
- A pop bumper doesn't work at all
- How the pop bumper driver board fires its coil
- Pop bumper locks on as soon as a game starts
- Pop bumper fires erratically or several times
- Add power and fire LEDs to a pop bumper driver board
- Under-playfield pop bumper driver boards protect the coils
- Pop bumpers fire on their own or work only sometimes
- How the System 80 pop bumper driver board works
Source: System 80 Service Manual, Gottlieb