S
ERVICE
P
ROCEDURES
78
T
O
REPLACE
THE
CPU
COOLING
ASSEMBLY
N
OTE
:
Before you install the cooling assembly, completely remove any thermal compound
residue on the surface of the CPU and the base of the heatsink, and then apply a fresh thermal
compound square to the base of the heatsink. When installing the thermal compound square,
make sure to remove the plastic backing
on both sides
of the square. Avoid creating any
bubbles or wrinkles on the square. Bubbles and wrinkles reduce the heat-transfer efficiency of
the cooling assembly.
1. Prepare the CPU cooling assembly for installation.
• Make sure that the motherboard is placed on a padded, static-free work surface.
• Apply a fresh thermal compound square, as described in the preceding note.
• Rotate fasteners to the position shown below by turning them clockwise (that is, in the
opposite
direction of the arrow on top of the fastener).
• Ensure that the pin inside each peg is fully retracted upward.
• Align the cooling assembly so that when it is installed, the fan cable easily reaches the CPU
fan power connector FAN 1 on the motherboard.
• Align the pegs over their mounting holes in the motherboard.
2. Place the heatsink over the CPU socket.
3. At alternate corners, press down on each fastener to engage the mount on the motherboard.
Engage all four pegs.
N
OTE
:
Do not rotate the fasteners after installation.
Engaging the pegs at alternate corners applies clamping force equally over the CPU and
socket. Avoid using excessive force and take care not to flex the motherboard when you engage
the pegs.
Before placing the cooling
assembly on the socket,
rotate each fastener to
this position.
Peg
Ensure that each pin is
fully retracted upward
inside its peg.
