Acer AT110 Series User Manual page 55

(1) Lift the bracket securing the slot covers of the expansion slots.
(2) Pull out the slot cover and store it for reassembly later.
Caution: Do not discard the slot cover. If the expansion card is
removed in the future, the slot cover must be reinstalled to
maintain proper system cooling.
Remove the expansion card from its protective packaging,
handling it by the edges.
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