Canon L90 - Manual (Page 162)

7-25
Maintenance
4
Remove the toner cartridge.
To avoid exposing the toner cartridge to
light, place it in its protective bag or wrap it
in a thick cloth.
Do not open the drum protective shutter
(A).
Always hold the toner cartridge by its handle.
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–
5
Close the toner cover.
Be careful not to get your fingers caught.
6
Detach the document feeder tray.