Williams WPC
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Introduction
Put system info here
Games
Put list of games that used this system here (including anything that might not have been pinball)
Technical Info
Problems and Fixes
Power Driver Issues
This may not apply to some, as MPU might have been part of it.
The WPC System Boardset and History
MPU Issues
Power Supply Issues
Display Driver Board
Possibly doesn't apply to some, can't think of an example.
Game Specific Problems and Fixes
Doctor Who
The time expander in Doctor Who can be very problematic - the opto boards crack and prevent the mushroom targets on the 2nd level of the time expander from working properly. Often the boards can be fixed with jumper wires and resoldering, and there are aftermarket boards available to replace both. Additionally, the plastic carrier the optos are attached too can warp, preventing the warped section from working. Finally, there is a cardboard shield attached to the carrier that prevents stray light leakage from affecting the optos (most notably during the Davros rounds). If it is missing usually you cannot complete the round as the light from the lock lamps prevents the optos from turning off.
Star Trek: TNG
There is a thin wire running from the 8 driver board (right side of backbox) to the single drop target reset coil on the playfield. Make sure this wire is present and secure, as coils will lock on if not. Replace this wire with a thicker variant to help prevent it breaking from vibration and stress.
Repair Logs
Did you do a repair? Log it here as a possible solution for others.