HP Compaq 2230s Maintenance And Service Manual page 75

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The thermal material must be thoroughly cleaned from the surfaces of the heat sink 1 and 3, the processor 2,
and graphics subsystem component 4 on the system board each time the heat sink is removed. Thermal material
is included with all System Board, Heat Sink, and Processor Spare Part Kits.
Reverse this procedure to install the heat sink.
Removal and replacement procedures 4–41