Hmmm, I think that this may be a couple of different issues, as are you looking for simplicity and reliability? Machines that are simple to remove the main components are not always good boxes.
The one I'm thinking of, which I still have a few in the district, are the Sharp Ar-337 to 507 series, as the fuser can be held in with one screw, the drum has one capture screw, and the dv requires only dropping a handle (no screws) to remove it. But, I am not a big fan of their overall reliability.
So, they are easy to disassemble the main components, but I would rather remove a few more screws and have an almost bulletproof machine---just my thoughts.
If you are referring to one complete screw that holds in a plate/retaining device that keeps all three in place, no office/production machine comes immediately to mind, but I'm sure there's something out there. In fact, I think that there are some Xerox machines that have customer replaceable units (CRU's) that I believe do not require any screws, but I have no first-hand experience with these models.
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