HP ProBook 640 G1 Maintenance And Service Manual page 91

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For computer models equipped with discrete graphics, following the 1, 2 sequence stamped into
the graphics board heat sink, loosen captive screws (1). Following the 1 through 4 sequence
stamped into the processor heat sink, loosen the four Phillips captive screws that secure
the processor heat sink to the system board (2). Then, remove the heat sink assembly (3).
NOTE: The thermal material must be thoroughly cleaned from the surfaces of the fan/heat sink assembly
and the system board components each time the fan and heat sink assembly is removed. Replacement
thermal material is included with the fan/heat sink assembly, processor, and system board spare part kits.
Thermal locations for computer models equipped with Intel UMA graphics are shown in the following
illustration:
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Thermal pads are used on the processor (1) and the heat sink section (2) that services it.
Fan and heat sink assembly 81