Oce CS520 User Manual page 377

6. Remove the cap of the new toner bottle, then set the same cap to
the removed bottle.
7. While positioning the "Up arrow" mark at the top and aligning the
two hollow parts of the toner bottle with the salients on the bottle
entrance, fully insert the new toner bottle until it locks in place.
1
New toner
2
Adding Toner
Empty toner
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