HP PAVILION 311 Maintenance And Service Manual page 84

Removal and replacement procedures
Remove the heat sink assembly:
1. Following the 1, 2, 3, 4, 5 sequence stamped into the heat sink assembly, loosen the 5 Phillips PM2.0×6.0
captive screws 1 that secure the fan and heat sink assembly to the system board.
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Due to the adhesive quality of the thermal material located between the heat sink and system board
components, it may be necessary to move the heat sink from side to side to detach it.
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Step 2 applies to HP Mini and Compaq Mini computer models. See Step 3 for HP Pavilion computer models.
2. Remove the heat sink assembly 2.
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The thermal material must be thoroughly cleaned from the surfaces of the heat sink and the system board each time
the fan and heat sink are removed:
Thermal paste is used on the processor 1 and the heat sink section 2 that services it.
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Thermal pads are used on the MCP79 chip 3 and the heat sink section 4 that services it.
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Replacement thermal material is included with all system board and heat sink assembly spare part kits.
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