Add power and fire LEDs to a pop bumper driver board

Steps

• Get two LEDs, two 270 to 470 ohm resistors and a 1N4004; drill four 1/16" holes for the LEDs.
• +5 V LED: flat lead to ground, round lead through a resistor to the +5 V trace; it should stay lit whenever the board is powered.
• Fire LED: flat lead to the header pin going to the coil's ground side; round lead through a resistor to the banded end of the 1N4004, whose other end goes to +5 V. It flashes when the board fires.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• How the pop bumper driver board fires its coil
• How the System 80 pop bumper driver board works
• A pop bumper doesn't work at all
• Bench check of a pop bumper driver board
• Common failures on the pop bumper driver board
• Mandatory pop bumper driver board update
• A pop bumper never fires
• Original pop bumper driver board values (A-19741)

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)