Acer AT350 F1 Series User Manual page 59

5 Use a screwdriver to loosen the four heatsink screws from the
mainboard by turning it counter-clockwise (1).
6 Lift the heatsink (2) away from the processor.
7 Lay down the heatsink in an upright position — with the thermal
patch facing upward. Do not let the thermal patch touch the work
surface.
8 Observe the post-installation instructions described on page 27.
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