The four groups of WPC coil outputs

The board has 28 outputs that all switch to ground, and any of them can drive a coil, flash lamp or motor. Outputs 1-8 are high-power (TIP36C with a TIP102 pre-driver), 9-16 low-power with the diode to +50 V, 17-20 flash lamp outputs fed from +20 V with no diode, and 21-28 general purpose for coils or flash lamps.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)

Related tips

• Where the WPC coil and lamp drivers sit
• How a WPC coil, flasher or lamp driver chain works
• Which transistor drives which WPC solenoid and lamp circuits
• A coil or flasher energizes as soon as the game is turned on
• Fliptronics flipper coil wired wrongly
• How Fliptronic flipper drive works
• Electronic spares worth keeping for System 11 boards
• CPU and driver board transistors by position

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer