The right flipper sometimes stayed in the up position, even after the game was switched off, and usually freed itself after a few seconds.

Flipper sometimes sticks up, even with power off: replace the coil sleeve

Cause: A worn coil sleeve was letting the plunger bind in the coil.

Checks

• With the game off, push the flipper up and let go; it should snap back freely.
• Check the coil sleeve, the coil stop for mushrooming, and the return spring.

Fix

• Replace the coil sleeve (and the return spring if weak). A full flipper rebuild kit is a good idea on a game new to you.

Systems

• Data East CPU Version 1/2

Games

• Time Machine

Related tips

• Checking a pre-solid-state flipper coil
• Flipper coil runs very hot (Time Machine and earlier)
• Flipper circuit on Laser War to Time Machine
• Weak flipper on Time Machine and earlier: pitted switch contacts
• Pre-solid-state flipper keeps blowing its fuse
• Flipper flutters when held (Time Machine and earlier)
• Flipper stuck up with power off: binding or worn pawl
• Flippers die after being held a few seconds, then recover

Source: Pinball Repair help group!! (Facebook group)