Canon imageCLASS MF5850dn Basic Operation Manual page 235

Replacing the Toner Cartridge
2
Push the open button.
3
Open the front cover.
4
Remove the toner cartridge.
11-8
– Always hold the toner cartridge by its handle.
– Do not open the drum protective shutter (A) on
the toner cartridge. Print quality may
deteriorate if the drum surface is exposed to
light or is damaged.
5
Gently rock the toner cartridge several
times to evenly distribute toner inside.
6
Align the toner cartridge to the guides in
the machine and slide the cartridge
completely into the machine until it
stops.