Canon imageCLASS MF3110 Basic Manual page 86

4
Rock the cartridge 5 or 6 times to distribute the toner evenly.
5
Place the cartridge on a flat and stable surface. Fold the tab (A) on
the sealing tape (B) as shown below, and pull it out straight while
supporting the cartridge.
Make sure that the tab itself is detached from the cartridge.
8
IMPORTANT
To avoid breaking the tape, do not pull out the tape at an upward or downward angle.
8-14 Replacing the Cartridge
B
A