Dell 1720/dn Mono Laser Printer - Manual (Page 29)

2. Pull the toner cartridge assembly out of the printer by pulling on the toner cartridge handle.
NOTE: Do not press the button on the toner cartridge assembly.
Place the toner cartridge assembly on a flat, clean surface.
3. Press the button on the base of the toner cartridge assembly.
4. Pull the toner cartridge up and out using the handle.
5. Unpack the new imaging drum.
6. Install the toner cartridge into the new toner cartridge assembly by aligning the white rollers on the toner cartridge
with the white arrows on the tracks of the imaging drum and pushing the toner cartridge in as far as it will go. The
cartridge clicks into place when correctly installed.