Acer Aspire one 521 Series Service Manual page 109

3. Replace nine (9) screws on the lower cover.
Step
Lower Cover
Disassembly
4. Replace the seventeen (17) screws on the upper cover.
Step
Upper Cover
Assembly
Chapter 3
Screw
(red call out)
(blue call out)
Size
M2*3
M2*5 Ni
Quantity
4
5
Quantity
11 (blue call out)
6 (red call out)
Screw Type
Screw Type
99