Using a memory back-up capacitor instead of a battery
A 1 farad memory capacitor in the battery position never leaks or wears out. It needs about 8 hours of power to charge at first, and the game must be on about an hour a month to keep it charged. Results vary with the RAM chip on the board. The negative lead is marked only by a stripe; the board marks the "+" hole. Check Z5 pin 22 for voltage afterwards.
Systems
Related tips
- Clean up battery corrosion on a System 80 CPU board
- Clean battery corrosion before fitting new parts
- Remove the original DataSentry battery from every System 80 CPU board
- Resistor values in the CPU battery corrosion area
- Orientation and static care when rebuilding the battery area
- Parts typically ruined by battery leakage on a System 80 CPU board
- Parts usually replaced in the CPU battery corrosion area
- Where the battery-area parts sit on the System 80 CPU board
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)