Acer AT310 F1 - Manual (Page 60)

3 System upgrades 42
4 Remove the heatsink fan assembly.
(1) Disconnect the heatsink fan assembly cable from its
mainboard connector.
(2) Using a screwdriver, loosen the four heatsink fan assembly
screws from the mainboard.
(3) Lift the heatsink fan assembly away from the processor.
(4) Lay down the heatsink fan assembly in an upright position —
with the thermal patch facing upward. Do not let the thermal
patch touch the work surface.
5 Observe the post-installation instructions described on page 29.