Canon imageCLASS 2200 Reference Manual page 196

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5-12 Adding Toner
Pull the black cartridge knob, until the stop sign appears.
Lightly tap the top of the toner cartridge to cause the toner to empty
into the toner box.
Push the black toner box handle back to its original position.
The toner cartridge will be pushed in, along with the toner box.