Maintenance and Service Guide

Heat sink
CAUTION: The bond between the heat sink and the processor may be very tight.
If the computer will power on, before removing the heat sink, turn on the computer until it warms the heat
sink. Warming the fan sink lessens the bond between the heat sink and the processor, thereby making
separating them easier.
Make sure not to pull the processor out of the socket when you lift the heat sink, especially if you cannot
warm the fan sink prior to removal. Inadvertently removing the processor can damage the pins.
The heat sink is secured with four captive Torx screws.
1. Prepare the computer for disassembly (Preparation for disassembly on page 16).
2. Remove the access panel (Access panel on page 17).
3. Remove the fan (Fan on page 36).
4. In the order indicated on the heat sink, loosen the three captive Torx screws (1) that secure the heat sink
to the computer.
5. Lift the heat sink about 30 degrees (2), and then pull heat sink toward front to the chassis to remove it
(3).
CAUTION: Be sure the loosen the screws in the order indicated by the numbers stamped on the heat
sink to avoid damaging the processor.
CAUTION: To reduce a degradation in thermal performance, be sure not to touch the thermal grease
on the surface of the processor or the heat sink.
To replace the heat sink, reverse the removal procedures.
Thermal grease services the processor (1) and heat sink (2). Thermal pads service the system board
components (3) and heat sink (4).
Heat sink 37