In attract mode the display blanks for 15 to 30 seconds, and only the first coin inserted gives a credit.

Jurassic Park: display blanks in attract, only first coin credits

Cause: A communication fault between the CPU and display processors puts the CPU into a wait that takes that long to time out.

Checks

• Check the CPU game ROM version.

Fix

• Install CPU game ROM version 5.10.

Systems

• Data East CPU Version 3

Games

• Jurassic Park

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