Oki C 9400 - Manual (Page 307)

3. Locate the cartridge (XXX, e.g., BLACK) to be changed and move the blue lock lever to
the right (away from the open cover) as far as it will go.
4. Lift the cartridge then slide it toward the back (to clear the tube) and lift it out.
5. Unpack the new toner cartridge and shake it back and forth to distribute the toner.
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