Dell C3760dn Color Laser Printer User Manual page 323

9 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.
10 Repeat step 9 also on the other three holes. One time insertion is enough for each hole.
11 Return the cleaning rod to its original location.
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.
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Maintaining Your Printer