WPC solenoid driver groups

Solenoids 1 to 8 are high power: +50 V, a TIP36 driver with a TIP102 and a 2N5401 pre-driver, typically an AE-26-1200 coil. Solenoids 9 to 16 are low power: +50 V, TIP102 driver, typically AE-26-1500. Drivers 17 to 20 are flashers on +20 V with no diode. Drivers 21 to 28 are general purpose: coils on +50 V with a diode, or flashers on +20 V without one, depending on the harness.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Firing each coil from the WPC solenoid test
• Why WPC coil diodes are on the driver board
• The four groups of WPC coil outputs
• Grounding test for WPC coils 1-8
• One coil does nothing in the solenoid test
• A solenoid will not fire in the solenoid test
• No coils work at all, fuses are good
• WPC coils need no diode except the flippers

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