HP Xw9400 HP xw9400 Workstation - Service and Technical Reference Guide - Page 125

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 63) and the CPU heatsink (Removing the CPU heatsink on page 113). 2. Use alcohol and a soft cloth to clean all of the thermal grease from the CPU heatsink and processor. CAUTION: Allow the alcohol on the processor and CPU heatsink to dry completely. 3. Apply fresh thermal grease to the top of the processor in the pattern shown in the following figure. Figure 5-71 Applying thermal grease 4. Place the CPU heatsink on top of the processor, and align the two 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 sc rew. ENWW Removing and replacing components 115

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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
63
) and the CPU heatsink (
Removing the CPU heatsink
on page
113
).
2.
Use alcohol and a soft cloth to clean all of the thermal grease from the CPU heatsink and processor.
CAUTION:
Allow the alcohol on the processor and CPU heatsink to dry completely.
3.
Apply fresh thermal grease to the top of the processor in the pattern shown in the following figure.
Figure 5-71
Applying thermal grease
4.
Place the CPU heatsink on top of the processor, and align the two 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 sc rew.
ENWW
Removing and replacing components
115