Lenovo ThinkServer sd350 Installation And Service Manual page 153

Heat sink for cpu 1
Figure 82. Heat sink installation
c. Align and place the heat sink on top of the microprocessor in the retention bracket, thermal
material side down.
d. Press firmly on the heat sink.
e. Press down on the center of the heat sink; then, press firmly on the captive screws and tighten
them, alternating between the screws in a figure-8 pattern as illustrated on the heat sink label
until they are tightened. You can cause damage to the microprocessor if you tighten the
screws on one side first, rather than rotating. Rotate each screw one full rotation at a time.
Repeat this process until the screws are tightened.
Step 10. Reinstall the air baffle (see "Installing the air baffle" on page 87).
Step 11. Reinstall compute node (see "Installing a compute node in a chassis" on page 77).
Step 12. Slide the server into the rack.
Step 13. Reconnect any cable that you removed.
Step 14. Turn on the peripheral devices and the server.
Thermal grease
The thermal grease must be replaced whenever the heat sink has been removed from the top of the
microprocessor and is going to be reused or when debris is found in the grease.
When you are installing the heat sink on the same microprocessor that it was removed from, make sure
that the following requirements are met:
• The thermal grease on the heat sink and microprocessor is not contaminated.
• Additional thermal grease is not added to the existing thermal grease on the heat sink and microprocessor.
Notes:
• Read the safety information that begins on "Safety" on page v.
• Read the "Installation guidelines" on page 75.
• Read "Handling static-sensitive devices" on page 76.
To replace damaged or contaminated thermal grease on the microprocessor and heat sink, complete the
following steps:
Step 1. Place the heat sink on a clean work surface.
Heat sink for cpu 2
Microprocessor
Chapter 5
.
Removing and replacing server components
137