Oki MC853 User Manual page 630

Memo
For the installation method, refer to
14.
Turn the blue lever (9) of the toner cartridge backward until its top
align on the
15.
Check a label color of a new image drum and place the drum into
the machine.
16.
Close the Output Tray (3) by pushing the both sides of the Output
Tray (3) firmly.
17.
Close the front cover (2).
Note
The front cover cannot be closed if the Output Tray is not closed securely.
"Replacing the Toner
mark while pressing the toner cartridge.
629
Cartridge".