4Remove the maintenance cover clamping screws (marked by ▼) (five special black screws 4 x 16, indicated by ●).
5Pull out the maintenance cover, and then remove the switch cover clamping screw (one PTT screw 4 x 16, indicated by ●).
6Open the lid of the switch cover, and then remove the switch clamping screw (one PPT screw 3 x 10, indicated by ●).
(3) Display board
1Perform the same work as in steps 1 through 4 of (2) above. 2Pull out the maintenance cover, and then remove the display
board lead wires (indicated by ●).
3Remove the display board from the mounting spacers (indicated by ●).