Has the pop bumper board factory fix been done?
Early boards (Haunted House and earlier) have a design error that Gottlieb fixed by service bulletin, but many games shipped without it. A board with two diodes, CR1 and CR2, is the original design; one diode (CR2) and a jumper in place of CR1 means it has been updated.
Systems
Related tips
- 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
- Pop bumper board wiring is in each game manual
- Common failures on the pop bumper driver board
- Use a TIP102 in place of the pop bumper board's 2N6057
- How the pop bumper driver board fires its coil
- Snappier pops: the System 80B pop bumper board values
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)