A flipper does not return, or its return spring is broken.

Jurassic Park, Last Action Hero: flipper return springs break

Cause: A crimp at the spring's mounting point on these games makes the spring snap easily.

Checks

• Check the return spring and its anchor.

Fix

• Replace the spring and remove the cause at the anchor as described in service bulletin 46.

Systems

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

Games

• Jurassic Park
• Last Action Hero

Related tips

• Jurassic Park, Last Action Hero, Tales from the Crypt: flipper dead from its EOS switch
• Jurassic Park, Last Action Hero, Tales from the Crypt: random resets in play
• Last Action Hero: CPU and display EPROM types and latest versions
• Jurassic Park can have either PPB
• Last Action Hero / Guns N' Roses: magnet dead or locked on
• Last Action Hero: flasher test fires coils instead
• Jurassic Park: "six balls missing"
• Jurassic Park: CPU code 5.10 protects the T-Rex motor

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