Dell 1320c - Color Laser Printer User Manual page 10

Installing the PHD (Print Head Device) Unit
1. Press the button (right side) and open the front cover.
2. Turn the four PHD lock levers counterclockwise to unlock the unit.
NOTICE: Do not touch the belt unit.
3. Pull the PHD unit out of the printer.
NOTICE: Do not remove the protective sheet on the PHD unit.
4. Completely remove the four yellow ribbons from the PHD unit.