Oki C5100n User Manual page 51

9. Holding the cartridge by its top centre with the coloured lever
to the right, lower it into the printer over the image drum unit
from which the old cartridge was removed.
10.
Insert the left end of the cartridge into the top of the image
drum unit first, pushing it against the spring on the drum unit,
then lower the right end of the cartridge down onto the image
drum unit.
11. Pressing gently down on the cartridge to ensure that it is
firmly seated, push the coloured lever (1) towards the rear of
the printer. This will lock the cartridge into place and release
toner into the image drum unit.
12. Finally, close the top cover and press down firmly at both
sides so that the cover latches closed.
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