Oki CX2731 User Manual page 223

e) Hold the blue handles of the new image drum unit and place it
into the machine.
f) Reinstall each color toner cartridge: First align the holes (1) of
the image drum unit with the posts (2) on the left end of the
toner cartridge.
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Replacing Consumables
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CX2731 MFP Basic User's Guide