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When checking for 24 VDC on S1, the voltage comes in on S1-8. There is a bridge between S1-8, 6, 4, 2. So if you have it on S1-8, and not on another, it could be a loose screw. Depends on what type S1 you have. If is the MK1 style, the "bridge" is several removable links. They sometimes get...

Think about this. Check the canon plugs on the bottom of the control panel. remove them, look into both parts, with a flashlight. Make sure nothing is burnt. If the plug is not inserted correctly, you can get this problem. Also if the pins are short out/burnt off. If that's good to go, next look...