Cleaning leaf switch contacts
Steps
- Solid-state games: wipe the contacts with an alcohol-dampened swab, or close the blades lightly on a business card and draw it through. Do not file gold-plated contacts.
- EM games: put a flexstone file, emery board or flat point file between the contacts, press lightly and file until clean; blow off any dust.
- Some people use an old toothbrush dipped in alcohol; do not bend the blades with it.
- If a switch sparks when it operates, file and adjust it until it stops, as sparking burns the contacts.
Systems
- Williams System 3
- Williams System 4
- Williams System 6 / 6A
- Williams System 7
- Williams System 9
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
- WPC Fliptronics
- WPC DCS
- WPC-Security (WPC-S)
- WPC-95
- Bally MPU AS-2518-17
- Bally MPU AS-2518-35
- Stern MPU-100
- Stern MPU-200
- Bally 6803
- Gottlieb System 1
- Gottlieb System 80
- Gottlieb System 80A
- Gottlieb System 80B
- Gottlieb System 3
- Data East CPU Version 1/2
- Data East CPU Version 3
- Data East/Sega CPU Version 3b
- Capcom
- Electro-mechanical
Related tips
- Cleaning gold leaf switches
- Leaf switch gap and damping blade
- Cleaning and gapping leaf switches
- Why EM switch contacts get dirty
- File EM switch contacts
- Test a leaf switch diode in place
- Adjust a leaf switch at the stack
- Switch contact point loose or missing
Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)