Dell C2665dnf User Manual page 500

4 Stand the removed waste toner box upright on a level surface.
WARNING:
Never lay the waste toner box on its side as this may cause its malfunction or toner spills.
5 Remove the cleaning rod from inside the printer.
6 Insert the cleaning rod fully into one of the four holes until it clicks into the interior of the printer as illustrated
below, and then pull it out.
7
Repeat step 6 also on the other three holes. One time insertion is enough for each hole.
498
Maintaining Your Printer