Epson LX-810 User Manual page 179

Interface Boards
6. Insert a screwdriver into the openings on the underside of the
printer. Push the screwdriver up, press the handle of the screw
driver toward the back of the printer to release the clips on the
case.
7. Partially raise the upper case, taking care not to strain the flat
cable attached to the control panel.
Using the Printer Options 5-47