Dell Precision NT499 User Manual page 253

3 Loosen the two captive screws on each side of the heat-sink assembly.
CAUTION:
Despite having a plastic shield, the heat-sink assembly may be very
hot during normal operation. Ensure that the assembly has had sufficient time to
cool before you touch it.
4 Rotate the heat-sink assembly upward, and remove it from the computer.
1 heat-sink assembly
5 Place the heat-sink assembly on its side in a safe place.
6 Disconnect the system fan cable from the system board.
2 captive screw housing (2)
Adding and Replacing Parts
1
2
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