Canon ImageClass MF 4270 Operation Manual page 157

Do not open the drum protective shutter (A).
7
Gently rock the toner cartridge
several times to evenly distribute
toner inside.
10-16
8
Place the toner cartridge on a
flat surface and pull the seal
completely out.
Do not pull the seal out at an angle.
– If toner is adhered on the removed seal, be
careful that your hands or clothes do not
get dirty from touching the toner.
– If your hands or clothes get dirty
from touching the toner, wash them
immediately in cold water. Do not use
hot water. If you do, the toner may be set
permanently.