IBM LS20 - BladeCenter - 8850 Service Manual page 97

5. Install a heat sink on the microprocessor.
Attention:
v Do not set down the heat sink after you remove the plastic cover.
v Do not touch the thermal grease on the bottom of the heat sink. Touching the
thermal grease will contaminate it. If the thermal grease on the
microprocessor or heat sink becomes contaminated, contact your service
technician.
Thermal grease
a. Remove the plastic protective cover from the thermal material on the bottom
of the heat sink.
b. Make sure that the thermal material is still on the bottom of the heat sink;
then, align and place the heat sink on top of the microprocessor in the
retention bracket, grease side down. Press firmly on the heat sink.
c. Align the four captive screws on the heat sink with the holes on the
heat-sink retention module.
d. Press firmly on the captive screws and tighten them, alternating between
screws until they are tight. Do not overtighten the screws by using excessive
force. If you are using a torque wrench, tighten the screws to 1.00 to 1.26
Newton-meters (Nm) (8.85 to 11.15 inch-pounds).
Attention: If you need to remove the heat sink after installing it, note that the
thermal material might have formed a strong bond between the heat sink and
the microprocessor. Do not force the heat sink and microprocessor apart; doing
so can damage the microprocessor pins. Loosening the captive screws on one
side of the heat sink fully before loosening the captive screws on the other side
helps break the bond between the components without damaging them.
6. Install the bezel assembly (see "Removing and replacing the bezel assembly"
on page 66 for instructions).
7. Install the blade server cover (see "Operating the blade server cover" on page
64 for instructions).
8. Install the blade server into the BladeCenter unit. See "Removing and installing
the blade server in a BladeCenter unit" on page 61 for instructions.
Heat sink
Chapter 4. Removing and replacing blade server components
83