Acer Altos G540 Series - Manual (Page 61)

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4 Remove the HSF assembly.
(1) Use a long-nosed screwdriver to loosen the four HSF
mounting pins.
(2) Once you have loosened all four mounting pins, lift the HSF
away from the mainboard.
(3) Lay down the HSF in an upright position—with the thermal
patch facing upward. Do not let the thermal patch touch the
work surface.
Use an alcohol pad to wipe off the thermal grease from both the
HSF assembly and the processor socket retention plate.
5 Remove the default processor.
Warning! The processor becomes very hot when the
system is on. Allow it to cool off first before handling.
(1) Release then lift up the load lever.
(2) Open the retention plate to expose the socket body.
(3) Grasp the processor by its edges and lift it out of its socket.