Acer AR160 F1 - Manual (Page 59)

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(4) Engage the load lever back into place.
8 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.
9 Install the heatsink (see “Installing a heatsink” on page 38).
10 Observe the post-installation instructions described on page 25.
11 Repeat the steps above to replace the second processor.