Cleaning gold leaf switches

Steps

• Close the switch on a clean business card and pull the card through one to three times.
• Do not file low-voltage gold contacts: filing removes the plating.
• Only file the high-voltage flipper cabinet switches and flipper EOS switches.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Cleaning leaf switch contacts
• Which switches are not in the switch matrix
• Switch test and audit display behaviour
• The switch test cannot check pop and sling trigger switches
• Board or playfield? The switch test jumper method
• Column 1 switches and switch wire colours
• Logic-probe the switch matrix
• Switch matrix connector pins and their chips

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)