Acer AW2000h-AW170h - Manual (Page 56)

3 System upgrades 40
Removing the heatsink
Warning! We do not recommend that the CPU or the heatsink be
removed. However, if you do need to uninstall the heatsink,
please follow the instructions below to prevent damage to the
CPU or the CPU socket.
1 Remove power from the system and unplug the AC power cord
from the power supply.
2 Using a screwdriver, loosen the heatsink screws from the
mainboard.
3 Lift the heat sink away from the processor.