An imaging system for an electrophotographic image forming device according to one example embodiment includes a movable latch positioned to selectively couple a replaceable toner cartridge and a replaceable imaging unit together such that the toner cartridge and the imaging unit are removable from the image forming device as a single unit and to selectively decouple the toner cartridge and the imaging unit such that the toner cartridge and the imaging unit are separately removable from the image forming device. A controller is configured to actuate the latch to couple the toner cartridge and the imaging unit together in response to the controller detecting an error condition requiring removal of both the toner cartridge and the imaging unit from the image forming device in order to permit removal of the toner cartridge and the imaging unit from the image forming device as a single unit.