Dell 3110cn Color Laser Printer - Manual (Page 331)

Close the control board cover and turn the screw clockwise. 5.
Removing the Optional Multi Protocol Card
NOTE: If the optional wireless printer adapter is also installed, it must be removed first.
Make sure that the printer is turned off and unplug all cables including the power cord from the rear of
the printer. 1.
Turn the screw on the control board cover gently in counterclockwise direction and open the cover. 2.