HP Compaq nw8440, nc8430, nx8420 Notebook PCs - Maintenance and Service Guide

Removal and Replacement Procedures
Maintenance and Service Guide 5–29
✎
The thermal paste should be thoroughly cleaned from the
surfaces of the heat sink 1 and processor 2 each time the
heat sink is removed. Thermal paste is included with all
heat sink and processor spare part kits.
Replacing the Thermal Paste
Reverse the above procedure to install the heat sink.