WPC power driver board versions and where they fit
A-12697-1 (5763-12405-00) has the flipper enable relay and works in every WPC-89 and WPC-S game, Funhouse to Who Dunnit. A-12697-3 (from mid Twilight Zone) lacks the relay, so it only suits Fliptronics games, Addams Family to Who Dunnit. A-12697-4 changes one solenoid fuse from 3 A to 5 A and drops the line-level circuit; it swaps with -3 and appears only on Who Dunnit. A-20028 (5763-14525-06) is WPC-95 only.
Systems
Related tips
- Where the WPC coil and lamp drivers sit
- Taking the power driver board out of the backbox
- Learn the power driver board layout first
- How a WPC coil, flasher or lamp driver chain works
- Testing a coil diode on the driver board
- Coil locks on as soon as the coin door closes: transistor shorted by the old coil
- 20-second test for shorted coil driver transistors
- Testing a 74LS374 driver latch with the diode setting
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)