Lexmark E 250d User Manual page 71

4
Press the two detents on the front right side of the machine, and swing the side door back.
5
Loosen the four screws on the cover, but do not remove them completely.
6
Slide the cover to the left until the screws fit into the keyholes on the cover.
7
Remove the cover and set it aside.
Accessing the system board
71