HP Xw8400 HP xw8400 Service and Technical Reference Guide - Page 100

Replacing the CPU heatsink, CAUTION,

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Replacing the CPU heatsink 1. Disconnect power from the system ( Pre-disassembly procedures on page 55). Remove the access panel (Access panel on page 60) and the CPU heatsink (Removing the CPU heatsink on page 88). 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. Place the CPU heatsink on top of the processor, and align the four mounting screws with the holes (1) in the system board. NOTE If both CPU heatsinks were removed, be sure that all system board standoffs engage with the keyholes in the chassis, and that the system board connectors engage correctly with the rear I/O panel, and push back on the system board while engaging the CPU heatsink screws with the chassis standoffs. You only need to push back when trying to engage the first screw. Figure 4-45 Replacing the CPU heatsink on the system board 90 Chapter 4 Removal and replacement procedures ENWW

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Replacing the CPU heatsink
1.
Disconnect power from the system (
Pre-disassembly procedures
on page
55
). Remove the access
panel (
Access panel
on page
60
) and the CPU heatsink (
Removing the CPU heatsink
on page
88
).
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.
Place the CPU heatsink on top of the processor, and align the four mounting screws with the
holes
(1)
in the system board.
NOTE
If both CPU heatsinks were removed, be sure that all system board standoffs
engage with the keyholes in the chassis, and that the system board connectors engage
correctly with the rear I/O panel, and push back on the system board while engaging the
CPU heatsink screws with the chassis standoffs. You only need to push back when trying
to engage the first screw.
Figure 4-45
Replacing the CPU heatsink on the system board
90
Chapter 4
Removal and replacement procedures
ENWW