Use the manual coil table and wiring diagrams to find a coil's transistors

The game manual lists each coil with its driver transistors in the flash lamp/coil test part of the diagnostics chapter. The yellow schematic pages add a "Playfield Coil/Flash Lamp Wiring Diagram" and a "Playfield Special Coil Diagram". Keep these at hand before chasing a coil fault.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• Use the manual's coil/flasher chart to find driver transistors
• Wiring a replacement coil the right way round
• Always check the coil diode when a driver transistor has failed
• Checking for voltage at a coil
• Testing a coil diode
• What the coil diode does and how a bad one shows up
• Check every coil's resistance before first power-up
• Why a locked-on coil goes low resistance

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)