Solenoid numbers above 28 and the 8-driver auxiliary board

The driver board itself handles solenoids 1-28. Numbers 29-36 use the Fliptronics section: on a two-flipper game the unused flipper power (TIP36) and hold (TIP102) transistors run other devices. Indiana Jones, Twilight Zone, Demolition Man, Road Show and Star Trek: The Next Generation add an 8-driver auxiliary board with eight more TIP102s for solenoids or flashers 37-44; on STNG, Twilight Zone and Indiana Jones it also provides a ninth switch-matrix column.

Systems

• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)

Games

• Indiana Jones: The Pinball Adventure
• Red & Ted's Road Show
• Star Trek: The Next Generation
• Twilight Zone

Related tips

• All flippers fire at power-up and blow the 50 V fuse: aux board ribbon upside down
• Right flippers energized at power-up: replace the ribbon cables
• Ninth switch column on Twilight Zone, Indiana Jones and STNG
• Twilight Zone ninth switch column (clock switches)
• Indiana Jones ninth switch column
• Star Trek: The Next Generation ninth switch column (gun switches)
• No coils, lamps, GI or flashers but display and sound work: check blanking
• Aux 8-driver boards must be jumpered for their game

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)