Why coil drivers are Darlingtons
A Darlington is two transistors in one package giving very high gain, which is why it is the usual coil driver (TIP102, TIP122). The tab is the collector, which is the point you ground when testing a driver.
Systems
- Williams System 3
- Williams System 4
- Williams System 6 / 6A
- Williams System 7
- Williams System 9
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
- WPC Fliptronics
- WPC DCS
- WPC-Security (WPC-S)
- WPC-95
- Bally MPU AS-2518-17
- Bally MPU AS-2518-35
- Stern MPU-100
- Stern MPU-200
- Bally 6803
- Gottlieb System 1
- Gottlieb System 80
- Gottlieb System 80A
- Gottlieb System 80B
- Gottlieb System 3
- Data East CPU Version 1/2
- Data East CPU Version 3
- Data East/Sega CPU Version 3b
- Capcom
Related tips
- Testing the 2N6043 coil drivers
- Testing a coil diode on the driver board
- How driver board coil transistors are switched
- How many coils the driver board can fire
- Which driver transistor fires which coil
- TIP102 is a good substitute for SE9302 coil drivers
- Solenoid driver board: how the MPU selects a coil
- Driver board A3-J4 coil outputs
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer