Connector 1J8 switch column pins
Columns 1 to 5 sit on 1J8 pins 1 to 5, pin 6 is the key, and columns 6 to 8 sit on pins 7 to 9. Column wires are green with a coloured tracer: brown, red, orange, yellow and black for columns 1-5, then blue, violet and gray for columns 6-8.
Systems
Related tips
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Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell