Why relays are used
A relay lets a small control current switch a heavy load, and keeps the control circuit electrically separate from the switched circuit. A relay that clicks but does not pass power has bad contacts; one that never clicks has a coil or drive fault.
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
- Relay coils used on System 80 games
- Relay or solenoid?
- Replacement GI relays
- Gottlieb relay return springs
- How latch-trip (interlock) relays work
- Relay banks and their reset coil
- What the under-playfield Tilt "T" relay does
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer