Chapter 2 Setup 4 Set the DIP switches, using the tip of a tool, such as a small screwdriver. 5 Install the left case and secure it with the screw. Align the groove on top of the left case with the rib of the upper case. Align the two hooks of the left case with the two holes of the board plate and slide it to the front. Rib Groove Holes 2 Hooks 37