Acer Altos R720 Series - Manual (Page 85)

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4 Loosen the four screws on the heat sink.
5 Lift the heat sink to remove it.
6 Place the heat sink upside down on a flat surface.
Note: Wipe off the thermal grease from both the heat sink and
processor using an alcohol pad.
7 Pull the CPU socket retainer lever handle down and away from the
socket to release it.
8 Lift the load plate.
9 Pull out the CPU from the socket, then store it in an anti-static bag.
To install a CPU:
1 Perform steps 1 to 3 of the “To remove a CPU:” section.
2 If a heat sink is installed, remove it.