Re: Sometimes violence is the only answer
"I assume the annoyance of having to walk 300 yards to slam in a toner cartridge resulted in the appropriate force being generated."
Most likely one of the wavy flag sensors being lifted out of place by removing the carts and then not dropping back into place when the carts are installed gently. Forcefully replacing the carts, or just a general thump will usually fix that as a workaround. The proper fix is to find it and clean it, though that is sometimes far more expensive than just working around it because sometimes those flags are deep in the bowels where even the most hardened printer engineers are afraid of going (ie an almost total strip-down to get there)