Acer Altos G540 M2 - Manual (Page 79)

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3 Remove the screws securing the HSF air duct assembly. Carefully
remove the HSF air duct assembly. Remember to keep the screws in
a safe place for later reassembly.
4 Disconnect the processor 1 HSF cable from its mainboard
connector and remove the HSF assembly.
(1) Use a long-nosed screwdriver to loosen the four HSF
mounting pins.