1. Pull the top and bottom case according to the same arrow direction (picture 1)
2. Take out the PCB board and panel together according to arrow direction.
(Picture 2)
3. Insert the PCB board to the panel (Picture 3)
4. Insert and fix the PCB board with panel to top case (Picture 4)
5. Press the panel to the top case and fix it. (Picture 5)
6. Finish fixing the panel. (Picture 6)
7. Slide the bottom case from the back side to closed it with top case (Picture 7)
8. Fix the bottom case to the panel hole. (Picture 8)