Dell 720 Color Printer User Manual page 13

3.
4. Remove the old ink cartridges.
5. Store the cartridges in an air-tight container or dispose of them properly.
6. If you are installing new ink cartridges, remove the sticker and transparent tape from the back and
bottom of each ink cartridge.
NOTE: You can use your printer with one cartridge (color or black) at a time. To extend the life of
your color cartridge and improve printing speed, install both a color cartridge and a black cartridge at
the same time.