Dell 3010cn Color Laser Printer - Manual (Page 42)

3. Hold the toner cartridge and pull out the cartridge.
Installing the New Toner Cartridge
1. Make sure the color of the toner cartridge matches the slot on the toner cartridge carrier. Gently shake the cartridge to distribute the toner evenly.
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 cartridge, face the label on the cartridge to the front and align it with the arrows on the printer.
CAUTION: Do not touch inside the printer with your hands. Some parts may be hot.
NOTE: Make sure that the printer is turned on.