Acer Altos R520 M2 Series User Manual page 58

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To install the top cover:
1 Perform the pre-installation instructions described on page 35.
2 Install the top cover.
(1) Place the top cover on the chassis so that the tabs on the cover
align with the slots on the chassis.
(2) Slide the top cover toward the front of the chassis until it is
fully closed.
(3) Replace the two screws on the top cover.
3 System upgrade