Acer Altos R910 - Manual (Page 73)

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2 If necessary, remove the CPU air baffle. Perform instructions
described in “Removing the CPU air baffle” on page 38.
3 Locate the CPU you want to remove.
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 to the fully open, upright
position.