Using a memory backup capacitor instead of batteries

A 1 farad memory capacitor never leaks, but needs about 8 hours on to charge at first and about an hour a month after; how long it holds varies with the RAM chip. The stripe marks negative and the board marks "+" for the positive hole.

Systems

• Gottlieb System 1

Related tips

• Clearing audit memory after a battery job
• Repairing battery corrosion on the CPU board
• Move the batteries off the board
• Changing batteries without losing settings
• Joker Poker: game PROM letter
• Dragon: game PROM letter
• Charlie's Angels: game PROM letter
• Solar Ride: game PROM letter

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)