Canon imageRUNNER 6570 Reference Manual page 456

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Replacing the Toner Cartridge
Lower the locking lever.
IMPORTANT
Make sure to lower the locking lever all the way to the 'Unlock' position. (Otherwise,
you may not be able to remove the toner cartridge.)
Remove the toner cartridge, supporting it with both hands.
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.