Comparison of Technologies Ink versus Laser: Implementation of Consumables
Brother-HL-2150N
To do that you have to remove the imaging drum first (see picture below). From that you take out the empty toner cartridge by pressing the green lever on the leftmost side. Then you insert the new cartridge. This printer has a corona wire, not a transfer roller. The wire must be cleaned whenever a cartridge is replaced.
HP-Officejet
Exchange of the ink cartridges is very easy. Blinking LEDs show, which cartridge is empty.