Common failures on the pop bumper driver board
The male header pins crack free of their solder, especially pin 1, which connects to Q1's case. Traces on the single-sided board break near parts. Q1 (2N6057/2N6059) often fails, leaving the pop dead or locked on. C4 (47 mfd 10 V by the header) dries open, and the 74LS121 and 74LS16 chips can fail.
Systems
Related tips
- How the System 80 pop bumper driver board works
- Bench check of a pop bumper driver board
- Mandatory pop bumper driver board update
- How the pop bumper driver board fires its coil
- Using a pop bumper driver board as a timer for motors and toys
- Original pop bumper driver board values (A-19741)
- Add power and fire LEDs to a pop bumper driver board
- Under-playfield pop bumper driver boards protect the coils
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)