Wiring a microswitch into the matrix
In the matrix the column wire (green) and row wire (white) go to the common and normally open lugs of a microswitch, with a diode across the contacts. Check the game drawing before swapping a switch so the diode polarity stays correct.
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
- Testing a diode on a matrix microswitch
- Narrowing a switch matrix fault to the CPU board, wiring or opto boards
- How the switch matrix reads a switch
- How the Williams switch matrix is scanned
- Use the switch matrix table in the manual
- System 11 switch matrix differences
- Testing the switch matrix with a logic probe
- WPC switch matrix basics
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer