Oki C3520 - Manual (Page 86)

Maintenance > 86
6. Put the cartridge down gently on to a piece of paper to
contain any toner spillage.
7. Remove the new cartridge from its box but leave its
wrapping material in place for the moment.
8. Gently shake the new
cartridge from end to end
several times to loosen
and distribute the toner
evenly inside the
cartridge.
9. Remove the wrapping
material and peel off the
adhesive tape from the
underside of the
cartridge.
10. 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.
CAUTION!
The green image drum surface is very delicate and
light sensitive. Do not touch it and do not expose it to
normal room light for more than 5 minutes. If the
drum unit needs to be out of the printer for longer
than this, please wrap the cartridge inside a black
plastic bag to keep it away from light. Never expose
the drum to direct sunlight or very bright room
lighting.