Canon Color imageCLASS MF8170c Basic Manual page 96

Confirm the color of the label on the toner cartridge holder, then
take out a toner cartridge of the same color from the protective
bag.
Open the protective bag with scissors, so as not to damage the cartridge.
IMPORTANT
8
8-8 Replacing the Cartridges
Keep the protective bag in which the cartridge came in. It may be required when taking
out the toner cartridge for machine maintenance.
Be careful not to hold or touch the prohibited portions such as the sensor or electrical
contacts. It may result in damage to the machine.
Electrical
contacts
Sensor