Oki 5700 - Manual (Page 106)

English
8-8 Chapter 8
3 Press on the latches on both sides of the copier stacker until the cover
of the image drum compartment is clearly released and pops up. Lift up
and back, revealing the image drum unit.
4 Pull back on the grey lever at the right end of the toner cartridge,
bringing the lever up and all the way back. Carefully remove the old
cartridge from the image drum unit, and set it aside on an old
newspaper, magazine, etc.
5 Remove the new toner cartridge from its packaging and shake gently to
evenly distribute the toner. (Wrap the old toner cartridge in the
packaging of the new cartridge before throwing it away.)