Midway (Williams) Y unit (Z unit and T unit) Discussion, Serial Numbers etc

[Arcade-Projects]

Bought myself another Y unit pcb recently to fix up. Smash TV! Fixed a lot of this era of boards over the years, as love the hardware. Probably because I've spent 30 years fixing pinballs so williams hardware is my happy place, ha ha. Also the diagnostic boot screen on this hardware is great to.

So thought id start a discussion on the hardware. First up Serial Numbers. Is there a place that documents the midway serial numbers so you can confirm from the official williams labels if the board...

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Source: https://www.arcade-projects.com/threads ... etc.25114/