The lamps under both slingshots never light, even with new bulbs and good fuses. Unplugging J12 on the interconnect board makes them come on, and they go off again when it is plugged back in.
Lamps under the slingshots out: wire in the wrong position in interconnect plug J12
Cause: One wire had been pinned into the wrong position in the J12 housing, probably during an earlier repair.
Checks
- Pull and meter the fuses rather than checking by eye.
- Compare each wire in J12 against the schematic, wire colour by colour.
- Note that the manual's wiring tables have known errors, so compare with another game of the same model if something doesn't match.
Fix
- Move the misplaced wire back to its correct position in J12.
Systems
Games
Related tips
- The interconnect board (Banzai Run and later)
- GI out on Banzai Run and later: burnt interconnect connector 2J6
- Repairing a burnt GI connector properly
- Lane change not working on Taxi and later System 11 games
- Coin door test buttons won't enter diagnostics: jumper test at the CPU plug
- Interconnect board and flipper power board fuses
- Flash lamp dead on an early System 11 game
- Mystery wheel loses its place: wheel motor control board diodes or opto
Source: Pinball Repair help group!! (Facebook group)