Oki B B8300 Reference Manual page 23

Adding Toner (cont.)
3. On the side, either unlatch the duplex
module and gently it pull away or
open the side cover.
4. While holding the lock release button
down, pull out the printer cartridge
and remove it.
5. Remove the new printer cartridge
from its bag and remove the protective
material A.
6. Shake the new cartridge horizontally
five or six times.
21
7. Insert the new printer cartridge. Push
the cartridge in until it locks securely
into place.