Dell 3000CN - Manual (Page 43)

Maintenance 43
2. Lift the tab up 90 degrees and pull the toner seal straight off, keeping it parallel with the toner
cartridge.
3. To insert the toner cartridges, align the arrows on the cartridge with the corresponding arrows
on the printer. Guide the cartridge in until it snaps into place and then push down the
handhold to lock the cartridge in place.