I've had two of these machines with "Toner cartridge set error" now and both have been a pin bent on the BRB PCB ( toner detect pcb).
I assume the new toner cartridge is replaced 'with force' and the centralising hole doesn't have time to work and it bends one of the pins on the side of the locating post on the PCB.
Not quite a bad strip down as the toner hopper but close.
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