Canon LBP7210Cdn Manual page 370

IMPORTANT
Do not touch the toner cartridge memory (A) or the electrical contacts (B).
This may result in damage to the cartridge.
Keep the protective bag.
Keep the protective bag for the toner cartridge. You will need it when you remove the toner
cartridge for printer maintenance or other purposes.
Shake the toner cartridge to evenly distribute the toner inside the cartridge.
Hold the toner cartridge as shown in the figure and shake it gently 5 or 6 times.
Do not remove the drum protective cover (A).
CAUTION
If toner gets into your eyes or mouth
Wash them immediately with cold water and consult a physician.
IMPORTANT
Be sure to perform this operation.
If toner is not distributed evenly, this may result in deterioration in print quality.