Keep opto switches clear
An opto switch is an LED shining on a phototransistor; blocking the light turns it off. Blow dust off and remove any dirt that blocks the light path.
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
- Testing optos in switch edge test
- Flipper cabinet opto switch boards
- Where WPC games use opto switches
- Clear stuck switches using switch test
- Opto switch intermittent
- Millionaire was the first Williams game with opto switches
- How WPC opto switches work and which half fails
- Opto does not work: check 12 V at the transmitter connector
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer