Sometimes violence is the only answer
At the opposite end of the scale was a large rogue Laser printer in one of our offices. We had many of these devices and most were loaded by users successfully, having trained them to be gentle, careful about engaging toner cartridges in the right slots etc. The exact same model in one office would only respond to extreme force. Follow the guidance properly and the damned thing would throw errors on every tray, ask you to check for non existent paper jams and insist on the whole rigmarole of opening and closing doors and trays in its preferred sequence before condescending to print anything. The only way to guaranteed instant performance was to shove the toner cartridge in with force, this seemed to cow the thing into good behaviour.
it never once misbehaved when an engineer attended and even an internal investigation failed to reveal any issues. It became the one printer in the building which required a service desk visit to change the cartridge. I assume the annoyance of having to walk 300 yards to slam in a toner cartridge resulted in the appropriate force being generated. Just as well it was in the HQ offices and not at the other end of the county.