Acer AT350 F1 - Manual (Page 64)

3 System upgrades 52
keyed in such a way that you cannot install the processor in
the wrong orientation without bending the pins.
(2) Hold the processor by its edges then insert it in the socket.
(3) Close the retention plate.
(4) Engage the load lever back in place and secure the load lever
under the load lever retention tab .
8 Apply the thermal interface material.
(a) Use an alcohol pad to wipe off the old thermal grease from
both the HSF assembly and the processor socket retention
plate.
(b) Apply a thin layer of thermal interface material before
installing the HSF.
Make sure that only a very thin layer is applied so that both
contact surfaces are still visible.
9 Install the heatsink fan assembly (see "Installing the heatsink and
fan assembly" on page 48).
10 Observe the post-installation instructions described on page 27.