Dell C3765dnf Color Laser Printer User Manual page 472

3 Insert the drum cartridge into the associated cartridge slot, and then push until it stops.
4 Repeat the steps 1 to 3 to insert the other three cartridges.
5 Remove the cleaning rod from inside the printer.
6 Remove the cleaning pad by pressing the white tabs between your thumb and index finger.
7 Unpack a new cleaning pad.
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Maintaining Your Printer