Dell 2130cn - Color Laser Printer User Manual page 119

7. Close the control board cover and turn the screw clockwise.
Removing the Network Protocol Adapter
1. Turn off the printer and unplug the power cable. Then, disconnect all cables from the back of the printer.
2. Turn the screw on the control board cover in a counter-clockwise direction and open the cover.
3. Remove the control board cover.
NOTE: Take off the below edge of the control board cover by turning the control board cover on hinge in the above edge. Next, remove the control
board cover by pulling it from the printer.
4. Remove the network protocol adapter by releasing the adapter's hooks.