No flipper works in any game.

Flippers never work: flipper relay RY1 not pulling in

Cause: Cold solder joints on RY1 or a failed Q80 (2N4401) driver.

Checks

• Listen for RY1 clicking at game start.
• Test Q80.
• Inspect the relay joints.

Fix

• Reflow RY1's joints and replace Q80 if bad.

Systems

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

Related tips

• CPU flipper enable relay RY1
• Three-stage drive for 50 V coils
• Flash lamp stuck on and melting plastics on L/R reversed games
• Quick test for shorted TIP122/TIP102 drivers
• How a coil or flasher is switched: PIA to TTL to pre-driver to driver
• A coil or flasher comes on and stays on at power-up
• Solenoid driver transistor positions on the CPU and PPB boards
• Replace the pre-driver along with a failed driver

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