Canon imageRUNNER 3530 Reference Manual page 338

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Replacing the Toner Cartridge
Twist the red protective cap of the new toner cartridge in the
direction of the arrow (counterclockwise) to remove it.
CAUTION
Do not touch the tip of the toner cartridge or subject it to shock by hitting
it. Doing so may cause the toner cartridge to leak.
Push the new toner cartridge in as far as possible.
Support the new toner cartridge with your hand from underneath while pushing it
into the machine with your other hand.