A flipper moves but very weakly, or both flippers are weak.

Solid state flipper very weak: power side has failed

Cause: Each flipper has a power fuse and a hold fuse; with the power fuse blown it runs on the 7 V hold only. A shorted TIP36 blows that fuse instantly. A blown 50 V fuse on the PPB board weakens both flippers. The S2800B SCRs can also fail.

Checks

• Check both fuses for each flipper on the flipper board, and the 50 V fuses on the PPB board.
• If a new power fuse blows at once, the TIP36 for that flipper is shorted.
• Check the S2800B SCRs.

Fix

• Replace the fuse, the TIP36 or the SCR as found.

Systems

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

Games

• Adventures of Rocky and Bullwinkle and Friends
• Back to the Future
• Batman
• Batman Forever
• Baywatch
• Checkpoint
• Guns N' Roses
• Hook
• Jurassic Park
• Last Action Hero
• Lethal Weapon 3
• Mary Shelley's Frankenstein
• Maverick
• Phantom of the Opera
• Robocop
• Star Trek
• Star Wars
• Tales from the Crypt
• Teenage Mutant Ninja Turtles
• The Simpsons
• The Who's Tommy Pinball Wizard
• WWF Royal Rumble

Related tips

• Solid state flipper has no power though fuses are good
• Solid state flipper stays up only after the button is first pressed
• Flipper stuck up with power on (Playboy and later)
• 50 V coils use PPB TIP36c transistors, pre-driven from the CPU board
• Three-stage drive for 50 V coils
• 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
• Solid state flipper does not work: fuses and fuse clips

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