Playfield switches, most often the slingshot switches, stop working.
Broken thin switch wires under the playfield, especially at the slingshots
Cause: Capcom used very fine gauge wire for the switches under the playfield, and it breaks easily, especially where slingshots shake it.
Checks
- Inspect the wires at the dead switch for breaks at the solder lug or inside the insulation.
- Check continuity from the switch back to the switch board.
Fix
- Splice or replace the broken wire and resolder it to the switch lug, with some slack so it does not flex at the joint.
Systems
Source: Capcom Pinball Problems/Solutions