Remove the original DataSentry battery from every System 80 CPU board
Every System 80 CPU board has a rechargeable 3.6 V NiCad "DataSentry" pack. Unused, it leaks caustic electrolyte that eats CPU board parts and connectors, so it must come off. Z3 (7404), Z2 (7474) and crystal Y1 near the battery are often the first damaged.
Battery leakage is caustic (potassium hydroxide); wear gloves and eye protection when handling a leaked battery and corroded parts.
Systems
Related tips
- Clean up battery corrosion on a System 80 CPU board
- Parts typically ruined by battery leakage on a System 80 CPU board
- Where the battery-area parts sit on the System 80 CPU board
- Resistor values in the CPU battery corrosion area
- Parts usually replaced in the CPU battery corrosion area
- Using a memory back-up capacitor instead of a battery
- Clean battery corrosion before fitting new parts
- Orientation and static care when rebuilding the battery area
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)