Acer AR380 F1 - Manual (Page 69)

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(4) Engage the load lever back into place.
10 Apply the thermal interface material.
(1) Use an alcohol pad to wipe off the old thermal grease
from both the heat sink and the processor socket
retention plate.
(2) Apply a thin layer of an approved thermal interface
material before installing the heat sink.
Make sure that only a very thin layer is applied so that
both contact surfaces are still visible.
11 Install the heatsink (see “Installing a heatsink” on page 47).
12 Observe the post-installation instructions described on page 27.
13 Repeat the steps above to replace the second processor.