Acer 4820T - Manual (Page 70)

60 Chapter 3
8. Remove the eight (8) screws from the top cover.
9. Remove the Upper Cover by lifting directly upward from the front as shown.
Step Size Quantity Screw Type
Upper Cover
(red callout)
M2.5*3L 3
Upper Cover
(blue callout)
M2.5*4L 5