Acer Altos R520 M2 Series User Manual page 76

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7 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 Acer-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.
8 Install the heatsink.
Caution! The heat sink has a thermal interface material (TIM) on
the underside. Use caution so that you do not damage the TIM. If
a protective film is installed on the TIM, remove it.
(1) Set the heat sink over the processor, aligning the four captive
screws with the four screw posts surrounding the processor.
(2) Loosely screw in the captive screws on the heat sink corners in
a diagonal manner.
Note: Do not fully tighten one screw before tightening another.
(3) Gradually and equally tighten each captive screw until each is
firmly tightened.
9 Observe the post-installation instructions described on page 36.
3 System upgrade