Oki OKIFAX 5400 Handbook page 18

3 With the ridged side facing up and the blue lever on your
right, insert the toner cartridge into the image drum unit,
left end first.
4 Push the lever forward to secure the cartridge.
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18 Handbook
5 Close the copy stacker—push down until you hear both
sides click into place.
6 Close the document table.