HP Xw8400 HP xw8400 Workstation - Service and Technical Reference Guide - Page 105

Replacing the CPU heatsink, CAUTION,

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Replacing the CPU heatsink 1. Disconnect power from the system ( Pre-disassembly procedures on page 50). Remove the access panel (Access panel on page 57) and the CPU heatsink (Removing the CPU heatsink on page 93). 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, ensure 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 4-64 Replacing the CPU heatsink on the system board ENWW Removing and replacing components 95

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Replacing the CPU heatsink
1.
Disconnect power from the system (
Pre-disassembly procedures
on page
50
). Remove the access
panel (
Access panel
on page
57
) and the CPU heatsink (
Removing the CPU heatsink
on page
93
).
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, ensure 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 4-64
Replacing the CPU heatsink on the system board
ENWW
Removing and replacing components
95