While debugging a GTB Target Pool, I was referred to this by a friend:
<https://hackaday.com/2022/01/10/get-a-grip-on-troubleshooting-your-vintage-pinball-machine/>
Which has some nice animated timing diagrams showing the interaction between the score motor and various switches.
Was useful to help find the misaligned end-of-stroke switch on the
10's score wheel that was keeping the 10pt relay locked.
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