Some Dr. Dude games have WPC boards

Roughly a hundred Dr. Dude games were built on the then-new WPC (alphanumeric) boards instead of System 11C. Confirm which system is in the backbox before using System 11 repair steps.

Systems

• Williams System 11C

Games

• Dr. Dude And His Excellent Ray

Related tips

• First Dude-meter lamps stay lit between games: that is normal

Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)