After a shop job and putting the playfield back together, the top popper eject and the lower left and right 3-bank target coils do nothing.
Top popper and both 3-bank coils dead after a rebuild: pinched 50 V wire, blown F104
Cause: The coils share one 50 V supply wire from J133. That wire had been pinched where the playfield meets the cabinet, shorted to ground and melted, which also blew the fuse for that coil group (F104).
Checks
- Use the manual to find what the dead coils have in common: here the same red-orange supply wire on J133 and the same fuse.
- Follow that wire and look for a crushed or melted spot, especially where the playfield pivots against the cabinet.
- Check the shared fuse by eye and with a meter.
Fix
- Cut out the damaged section, splice in new wire with solder and heat shrink, and reroute it so it cannot be pinched again.
- Replace the blown fuse with the value printed on the fuse card.
Systems
Games
Related tips
- One coil will not fire
- No coils work at all, fuses are good
- Two or more coils fire together
- A coil does nothing although its fuse is good
- Coil-not-working checklist
- Firing each coil from the WPC solenoid test
- Why WPC coil diodes are on the driver board
- A coil stays energized
Source: Pinball Repair help group!! (Facebook group)