Oki C5510nMFP User Manual page 75

7. Gently shake the new cartridge from end to end several
times to loosen and distribute the toner evenly inside the
cartridge.
8. Remove the wrapping material and peel off the adhesive
tape from the underside of the cartridge.
9. Holding the cartridge by its top center with the colored
lever to the right, lower it into the machine over the
image drum unit from which the old cartridge was
removed.
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