Canon imageCLASS MF275dw Wireless All-In-One Monochrome Laser Printer - Manual (Page 483)

The bottom of the toner cartridge is unprotected. Be careful not to bump the bottom of the toner cartridge
against the slot frame or other parts when installing.
6
Close the toner cover.
7
Lower the operation panel.
Replacing Toner Cartridge
1
Lift the operation panel.
Check the following before lifting up the operation panel:
● The feeder or platen glass cover is completely closed.
● There are no thick originals such as books placed on the platen glass.
* Using excessive force to raise the operation panel could cause a fault.
2
Close the paper stopper, and then open the toner cover.
3
Remove the toner cartridge.
Maintenance
474