Picked up a non-working Close Encounters with System-1. Began by repining the connectors to the Control Board, cleaned up a little corrosion on the Control Board, and replaced 4 corroded resistors (R33, 34, 37, 38). Repaired the power supply board that was not working, so all voltages to the Control Board are correct.
I am following Clay's step by step guide on powering up a System-1 game for the first time. The power supply is connected to the Control Board (A1-J1), and the two connectors on the right side of the Control Board are connected (A1-J2, J3). Nothing else is connected to the Control Board. When I turn the power on, the two upper displays show all zeros, and the two lower displays are blank, except for a few strobing segments. I suspect Z17 is bad (or something else?). After a minute or so I noticed Z17 got hot to the touch. Z16 was not hot at all. Any suggestions the experts can offer? I'm a mechanical engineer, not electrical