Catching random switch closures
Steps
- Remove the balls to leave as many switches open as possible.
- Enter switch test and let the stuck-switch report pass until it reports every switch open.
- Leave the game for about 15 minutes.
- If anything closed by itself, the display keeps the last switch's name and number.
- Check every switch and lamp on that switch's strobe and return lines, especially sockets with a lot of flux.
Systems
Related tips
- Switch diodes are on the A17 board, not the switches
- Smart Switch pin 1 and pin 2
- What is inside a Smart Switch
- Proving the driver board's switch strobes
- Gottlieb Smart Switches (piezo)
- Lamp and switch matrix size and drivers
- System 3 slam switch is normally open
- Never bend a Smart Switch blade
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)