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Heat sink
Description Spare part number
Heat sink 645326-001
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 heat 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 heat sink prior to removal. Inadvertently removing the processor can damage the
pins.
1. Prepare the computer for disassembly (Preparation for Disassembly on page 49).
2. Remove the computer access panel (
Computer Access Panel on page 50).
3. Remove the front fan (
Front Fan Assembly on page 78).
4. Loosen the four silver captive Torx T15 screws that secure the heat sink to the system board.
CAUTION: Remove heat sink retaining screws in diagonally opposite pairs (as in an X) to even
the downward forces on the processor. The pins on the socket are very fragile and any damage
to them may require replacing the system board.
82 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis