Acer Aspire E1-521 - Page 149

Service and Maintenance 5-50
9. Install the DIMM Module (see DIMM Module Installation on page 5-22).
10. Install the upper case (see Upper Case Installation on page 5-38).
Table 5:7. Mainboard Screws
Screw Name Screw Type Quantity
M 2.5 x 5.0 2