Canon imageRUNNER C3489 Reference Manual page 376

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Replacing the Toner Cartridge
Hold the upper part of the protective packaging as in the
illustration below, and pull out the protective packaging and
the toner cartridge.
Open the top portion of the protective packaging by pulling it
apart sideways, as in the illustration below.
After opening the protective packaging, the used toner
cartridge will be removed from the machine. Leave the
packaging as is.