Acer AR320 F1 - Manual (Page 58)

3 System upgrades 40
(4) Engage the load lever back in place and secure the load lever
under the load lever retention tab.
6 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.
7 Install the heatsink (see “Installing a heatsink” on page 36).
8 Observe the post-installation instructions described on page 23.