Standard switch and diode wiring
On most switches the green ground (column) wire goes to the centre lug, the white row wire and the unbanded diode end go to the lug nearest the centre, and the diode band sits alone on the far common lug. The game manual lists any exceptions.
Systems
Related tips
- How wiring faults show up in switch test
- Finding a switch wiring short to ground
- Credit button and a whole switch row dead: shorted diode on one switch
- Using the System 11 switch tests
- System 11 switch matrix differences
- Entering the System 11 switch tests
- Strange behaviour across a whole row or column from a switch diode
- Testing a microswitch diode without unsoldering it
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell