Every so often the lower right flipper stops completely and there is no voltage at the coil, then comes back after the buttons are played with, lasting a few games before failing again. Fuses are fine.

Lower right flipper cuts out for a few games at a time: faulty EOS switch

Cause: On these Data East games the EOS switch is normally closed and is part of the coil's power path. The switch looked fine but was not making reliable contact.

Checks

• Clip a jumper across the EOS switch, or hold its contacts together by hand, and see if the flipper works every time.
• Also check the flipper board fuse clips and header joints, which often crack on this board.

Fix

• Replace the EOS switch; fit a new coil sleeve and return spring while the flipper is apart.

Systems

• Data East CPU Version 3

Games

• Jurassic Park

Related tips

• Upper flipper dead and its flipper board LED never lights: dirty cabinet button switch
• Solid state flipper has no power though fuses are good
• Flipper sometimes stays up until power off: broken coil diode
• Flipper EOS switch role from Jurassic Park on
• Measuring voltage at a solid state flipper coil
• Flippers die after being held a few seconds, then recover
• Solid state flipper stays up only after the button is first pressed
• Lower flipper dead on Jurassic Park, Last Action Hero or Tales from the Crypt

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