Aux 8-driver boards must be jumpered for their game

The 8-driver auxiliary boards are the same hardware across titles but carry four jumpers that differ by game. When moving one between games, for example from Demolition Man to STNG, set the jumpers for the new game.

Systems

• WPC DCS

Games

• Star Trek: The Next Generation

Related tips

• Underplayfield diverter coil burns and locks on: shorted Q15 on the aux 8-driver board
• Solenoid numbers above 28 and the 8-driver auxiliary board
• Testing a coil diode on the driver board
• Taking the power driver board out of the backbox
• Learn the power driver board layout first
• 20-second test for shorted coil driver transistors
• Testing a 74LS374 driver latch with the diode setting
• Replace the pre-driver along with a failed driver transistor

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