IBM xSeries 235, Maintenance & Troubleshooting, Page: 93 / 214

Attention:
v Do not use excessive force when pressing the microprocessor into the
socket.
v Make sure that the microprocessor is oriented and aligned correctly with
pin number 1 in the socket before you try to close the
microprocessor-release lever. The following illustration shows the
alignment marks for both microprocessors and sockets.
Microprocessor 2
Microprocessor 1
Microprocessor
socket 2
Microprocessor
socket 1
Alignment marks
Alignment marks
d. Carefully close the microprocessor-release lever to secure the
microprocessor in the socket.
9. Install a heat sink on the microprocessor:
a. Remove the protective film from the bottom of the heat sink.
Notes:
1) Do not set the heat sink down after you remove the protective film.
Heat sink
Thermal grease
2) 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.
b. Align and place the heat sink on top of the microprocessor (grease side
down) in the retention bracket. Press firmly on the heat sink.
c. Secure the heat sink to the microprocessor by tightening the captive
screws. Alternate between the two captive screws in the heat sink while
tightening them.
Attention: Alternate the tightening of the two captive screws to prevent
damage to the microprocessor. Ensure that the screws are completely
tightened (until they stop); otherwise, damage to the microprocessor will
occur.
10. Close the cover on the air-baffle assembly.
11. If you have other options to install or remove, do so now; otherwise, go to
“Installing the server bezel and left-side cover (tower model)” on page 96 or
“Installing the server bezel and top cover (rack configuration)” on page 99.
Chapter 4. Customer replaceable units
83