Oki C610dtn User Manual page 94

8. Place the toner cartridge onto the new image drum cartridge
as shown. Push the left end in first, and then lower the right
end in. (It is not necessary to fit a new toner cartridge at this
time unless the remaining toner level is very low.)
9. Push the colored release lever away from you to lock the
toner cartridge onto the new image drum unit and release
toner into it.
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