The held flipper chatters.

Solid state flipper flutters when held

Cause: A flipper board fuse, a TIP32C hold transistor, or on Phantom of the Opera and earlier, dirty leaf-type cabinet switches.

Checks

• Check the flipper board fuses.
• Diode-test the TIP32C hold transistors.
• Inspect the cabinet buttons; enclosed microswitches replaced leaf switches during Phantom of the Opera production.

Fix

• Replace the fuse or transistor, or clean (or upgrade) the cabinet switches.

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

• Flipper stuck up with power on (Playboy and later)
• Solid state flipper goes up but will not stay up
• Solid state flipper stays up only after the button is first pressed
• Solid state flipper does not work: fuses and fuse clips
• Solid state flipper has no power though fuses are good
• Solid state flipper very weak: power side has failed
• Protect the flipper boards when lifting the playfield
• Solid state flipper board versions

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