Acer AW2000h-AW170h - Manual (Page 57)

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4 Lay down the heat sink in an upright position — with the thermal
patch facing upward. Do not let the thermal patch touch the work
surface.
Installing a 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 Remove power from the system and unplug the AC power cord
from the power supply.
2 Do not apply any thermal grease to the heatsink or the CPU die;
the required amount has already been applied.
3 Place the heatsink on top of the CPU so that the four mounting
holes are aligned with those on the (preinstalled) heatsink
retention mechanism.