HP dx2290 Service Reference Guide - HP Compaq dx2290 Business PC - Page 59

Heatsink

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Heatsink 1. Prepare the computer for disassembly (Preparation for Disassembly on page 26). 2. Remove the access panel (Access Panel on page 28). 3. Lay the computer down on its side for greater stability. 4. Disconnect the heatsink control cable from the system board. 5. Loosen the four captive screws that secure the heatsink to the system board. 6. Lift the heatsink from atop the processor and set it on its side to keep from contaminating the work area with thermal grease. When reinstalling an existing heatsink, make sure that its bottom has been cleaned with an alcohol wipe and fresh thermal grease has been applied to the top of the processor. New heatsinks come from the factory with fresh thermal grease already applied. Check to ensure that the heatsink mounting lugs do not rest on any electrical components before tightening the retaining screws. CAUTION: Position the heatsink so that fan wiring is closest to the memory modules. Failure to install the heatsink in the correct position may result in the computer overheating. CAUTION: Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink to the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board. Heatsink 51

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Heatsink
1.
Prepare the computer for disassembly (
Preparation for Disassembly
on page
26
).
2.
Remove the access panel (
Access Panel
on page
28
).
3.
Lay the computer down on its side for greater stability.
4.
Disconnect the heatsink control cable from the system board.
5.
Loosen the four captive screws that secure the heatsink to the system board.
6.
Lift the heatsink from atop the processor and set it on its side to keep from contaminating the work
area with thermal grease.
When reinstalling an existing heatsink, make sure that its bottom has been cleaned with an alcohol wipe
and fresh thermal grease has been applied to the top of the processor. New heatsinks come from the
factory with fresh thermal grease already applied.
Check to ensure that the heatsink mounting lugs do not rest on any electrical components before
tightening the retaining screws.
CAUTION:
Position the heatsink so that fan wiring is closest to the memory modules. Failure to install
the heatsink in the correct position may result in the computer overheating.
CAUTION:
Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to
evenly seat the heatsink to the processor. This is especially important as the pins on the socket are very
fragile and any damage to them may require replacing the system board.
Heatsink
51