Flippers do not work in play, and some or all of the pop bumpers and slingshots are dead too, though the fuses are good.
Flippers and special coils all dead
Cause: A failed 7402 at 12B (sometimes 12A). The 12B chip also gates blanking, so when it fails the CPU may not even boot properly.
Checks
- Check the 7402s at 12A and 12B with a logic probe.
Fix
- Replace 12B (and 12A if bad) with socketed 7402s.
Systems
Related tips
- Logic chips for the special solenoid transistor pairs
- How a coil or flasher is switched: PIA to TTL to pre-driver to driver
- Special solenoid signal paths SS1-SS6 on the CPU board
- A coil or flasher comes on and stays on at power-up
- Right sling locks on at power-up and a pop is dead: bad 7402 at U45
- Diverter coils dead and flippers live at game over: 7402 at U50
- Damage after the black and white plugs were swapped
- Coil fires when tested but not in game play: TTL driver chip
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)