How flipper power is routed by generation

On System 3 and 4, +28 V goes straight from the solenoid bridge to the flippers through a fuse under the playfield. On System 6 and 7 it passes through the power supply board, fused by F4. Firepower II, Laser Cue and Star Light take flipper power from the separate 50 V flipper supply board.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Games

• Firepower II
• Laser Cue
• Star Light

Related tips

• Three flipper mechanism generations
• Second-generation flipper rebuild: assemblies
• 50 volt flipper power supply on the last three System 7 games
• Where flipper power comes from
• Where the flipper fuse is by generation
• Weak flippers
• Improving first-generation System 3/4 flippers
• Power at the flipper coil but no flip

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)