HP xw4300 Service And Technical Reference Manual page 89

7. Use alcohol and a soft cloth to clean all the thermal interface material residue from the CPU heatsink and
processor.
CAUTION: Allow the alcohol on the processor and CPU heatsink to dry completely.
8. Use alcohol and a soft cloth to clean all of the thermal interface material residue from the CPU heatsink and
processor.
To replace the CPU heatsink:
1. Disconnect power from the system
heatsink (section 4.29).
2. Use alcohol and a soft cloth to clean all of the thermal interface material residue from the CPU heatsink and
processor.
CAUTION: Allow the alcohol on the processor and CPU heatsink to dry completely.
3. Check for proper processor seating in the socket by carefully trying to lift the processor out of the socket with your
fingers. A properly seated processor does not lift out of the socket.
4. Apply thermal grease to center of the processor. If using a new CPU heatsink, remove and discard the thermal
grease protective liner from the bottom of the new CPU heatsink.
NOTE: Do not touch the exposed thermal grease when handling the CPU heatsink.
5. Lower the CPU heatsink onto the system board.
6. Carefully tighten the four screws a little at a time; do not fully tighten one screw and move onto the next. Be sure
the processor remains level and be sure you do not overtighten the screws. If you have a torque-limited driver
available, tighten the screws to the correct torque setting of 6 in-lbs.
CAUTION: Do NOT overtighten the screws. If you overtighten the screws, you risk stripping the threads in the system
board tray.
(section 4.2), open the access panel (section 4.9), and remove the CPU
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