Three-stage drive for 50 V coils
A 2N4401 on the CPU board switches a TIP122, which switches the PPB TIP36c that grounds the 50 V coil. Every TIP36c needs its TIP122/TIP102 pre-driver. In the example in the guide, an up-kicker returns through PPB Q5 and D3 to CPU Q44, and a non-multiplexed VUK uses PPB Q2 driven by CPU Q24.
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
- Solenoid driver transistor positions on the CPU and PPB boards
- F5 blows on a flip, then slings dead: shorted drivers and a loose coil power wire
- CPU and driver board transistors by position
- Quick test for shorted TIP122/TIP102 drivers
- Replace the pre-driver along with a failed driver
- A coil or flasher comes on and stays on at power-up
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)