Testing a diode on a matrix microswitch
On a matrix microswitch the diode sits across the normally closed contact, so hold the switch actuated while you test the diode. Turn the game off first.
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
- Wiring a microswitch into the matrix
- Testing a microswitch diode without unsoldering it
- Testing a microswitch diode without unsoldering it
- How the switch matrix reads a switch
- Testing a switch diode out of circuit
- How the Williams switch matrix is scanned
- Use the switch matrix table in the manual
- System 11 switch matrix differences
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer