Use the switch matrix table in the manual
The game manual has a switch location chart and a switch matrix table. The table gives each switch name and number, its wire colours, the CPU connector and the chip involved, and shows which switches share a row or column.
Systems
- 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
Related tips
- How the switch matrix reads a switch
- How the Williams switch matrix is scanned
- System 11 switch matrix differences
- Testing the switch matrix with a logic probe
- WPC switch matrix basics
- Switch matrix chips on the CPU board
- Checking the switch matrix with a logic probe
- Switch matrix resistor networks and their values
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer