Dell C2665dnf User Manual page 478

12 Reinsert the removed waste toner box.
CAUTION:
If the waste toner box does not fit into place properly, make sure that the drum cartridge is fully inserted in
the previous step.
13 Turn the waste toner box lock lever 90-degrees clockwise to lock the waste toner box.
14 Close the right side cover.
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Maintaining Your Printer