Correct wiring of an under-playfield 2N5875
Previous repairers sometimes miswire these. Base (two wires: the white/red/red one to the driver board plus a 4.7k pull-up resistor to +24 V) goes to the driver board; emitter goes to the coil lug on the unbanded side of the diode (the banded side goes to +24 V); the case (collector) takes the green ground wire.
Systems
Related tips
- Replacements for the under-playfield 2N5875
- Replacements for the 2N5875 under-playfield power transistors
- Testing a playfield-mounted 2N5875/2N5879 with a meter
- Under-playfield pop bumper driver boards protect the coils
- Which wire goes where on a playfield 2N5879
- Pop bumper board wiring is in each game manual
- Playfield coil chart: resistance and use
- Adding the 4.7k base pull-up to playfield power transistors
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)