Acer Aspire E1-521 Acer Aspire E1-521 Notebook Service Guide - Page 139

5. Attach the 21 screws to secure the upper case and the lower case. Figure 5:55. Attaching the Upper and Lower Case Screws 6. Install the keyboard (see Keyboard Installation on page 5-32). 7. Install the base door (see Base Door Installation on page 5-13). Table 5:6. Upper and Lower Case Screws Screw Name Screw Type M 2.0 x 2.5 Quantity 3 M 2.5 x 5.0 2 M 2.5 x 8.0 16 Service and Maintenance 5-40