A coil does not fire in play.

Coil does not work: quick checklist

Cause: Usually a wiring, fuse or coil fault at the playfield; less often the driving transistor.

Checks

• If it is stuck on instead (heat, smoke, smell), switch off and check its driver transistor.
• WWF Royal Rumble and later: coin door closed?
• Wires still on the lugs? Winding still attached to its lug? Coil damaged?
• Voltage at the coil? If not, check its fuse and whether other coils sharing its power wire colour also fail.
• Continuity from the coil to the correct CPU connector pin.
• Test the driver transistor.

Fix

• Repair whatever check fails.

Systems

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

Related tips

• A solenoid does not fire in the diagnostic coil test
• Only flash lamps work when a game starts (L/R reversed games)
• Version 3 CPU fires special coils once per switch closure
• A coil has power but never fires
• 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

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