Special solenoid signal paths SS1-SS6 on the CPU board
On revision 3 boards each special solenoid runs PIA -> 7407 at 11C -> 7402 -> 2N4401 -> TIP122 -> CN19. SS1: PIA 8H pin 19, 12A, Q2, Q8, CN19-3. SS2: 9B pin 19, 12A, Q3, Q9, CN19-4. SS3: 11D pin 39, 12A, Q4, Q10, CN19-6. SS4: 8H pin 39, 12A, Q5, Q11, CN19-7. SS5: 11D pin 19, 12B, Q6, Q12, CN19-8. SS6: 9B pin 39, 12B, Q7, Q13, CN19-9.
Systems
Related tips
- Logic chips for the special solenoid transistor pairs
- A coil or flasher comes on and stays on at power-up
- Flippers and special coils all dead
- How a coil or flasher is switched: PIA to TTL to pre-driver to driver
- Diverter coils dead and flippers live at game over: 7402 at U50
- Special solenoids: switch-fired on CPU Rev 1/2, CPU-fired on Rev 3
- Right sling locks on at power-up and a pop is dead: bad 7402 at U45
- Stern SB-100 sound board screeches until a game sound plays
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)