Solenoid driver transistor positions on the CPU and PPB boards
TIP122 drivers on the CPU board: Q39-Q46 (bank-switched through the L/R relay), Q8-Q13 (special solenoids), Q23-Q30 (constant-power coils) and Q72-Q79 (lamp matrix row returns). 2N4401 pre-drivers for them sit at Q2-Q7, Q15-Q22 and Q31-Q38. TIP36c high-power drivers are Q1-Q5 on the PPB board; Laser War and Secret Service have no PPB board and so no TIP36c.
Systems
Related tips
- 50 V coils use PPB TIP36c transistors, pre-driven from the CPU board
- How a coil or flasher is switched: PIA to TTL to pre-driver to driver
- Three-stage drive for 50 V coils
- CPU and driver board transistors by position
- F5 blows on a flip, then slings dead: shorted drivers and a loose coil power wire
- Replace the pre-driver along with a failed driver
- Quick test for shorted TIP122/TIP102 drivers
- Where the TIP122 drivers are on the CPU board
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)