Dell C3765dnf Color Laser Printer User Manual page 478

3 Turn the waste toner box lock lever 90-degrees counterclockwise to unlock the waste toner box.
4 Grasp the handle on the waste toner box and pull it out making sure to hold it upright so that the waste toner does
not spill out.
CAUTION:
Take care not to drop the waste toner box while you are removing it.
CAUTION:
After removing the waste toner box, do not touch the parts shown in the illustration. Toner can dirty or stain
your hands.
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Maintaining Your Printer