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Wednesday 7 March 2018 at 03:15
Let's try to break this down into smaller pieces. The schematic shows that the Outhole switch fires the Bonus relay, and then the Bonus relay holds itself on (through the Bonus relay switch) until a switch on the Advance Unit opens when the Advance unit reaches the zero position.
Triple Action Bonu...
Source: http://pinside.com/pinball/forum/topic/outhole-sequence-issue-1974-williams#post-4266922