HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC - Page 66

Heat sink, WARNING, CAUTION

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Heat sink WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching. You will need a screwdriver with a narrow shaft to loosen the heat sink screws. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 28). 2. Remove the computer access panel (Computer Access Panel on page 32). 3. Unplug the fan cable from the system board (CPU FAN1). 4. Loosen the four silver T15 captive screws that secure the heat sink to the system board. Figure 6-38 Removing the heat sink CAUTION: Heat sink retaining screws should be removed in diagonally opposite pairs (as in an X) to even the downward forces on 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. 5. Remove the heat sink from the processor. When reinstalling the heat sink, 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. CAUTION: Heat sink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heat sink on 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. 60 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis

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Heat sink
WARNING!
To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to
disconnect the power cord from the wall outlet and allow the internal system components to cool before
touching.
You will need a screwdriver with a narrow shaft to loosen the heat sink screws.
1.
Prepare the computer for disassembly (
Preparation for Disassembly
on page
28
).
2.
Remove the computer access panel (
Computer Access Panel
on page
32
).
3.
Unplug the fan cable from the system board (CPU FAN1).
4.
Loosen the four silver T15 captive screws that secure the heat sink to the system board.
Figure 6-38
Removing the heat sink
CAUTION:
Heat sink retaining screws should be removed in diagonally opposite pairs (as in an
X) to even the downward forces on 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.
5.
Remove the heat sink from the processor.
When reinstalling the heat sink, 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.
CAUTION:
Heat sink retaining screws should be tightened in diagonally opposite pairs (as in an X) to
evenly seat the heat sink on 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.
60
Chapter 6
Removal and Replacement Procedures Microtower (MT) Chassis