Lenovo ThinkSystem SD550 V3 User Manual page 185

Step 3. Apply the thermal grease.
• If you are replacing the heat sink and reusing the processor, a new heat sink comes with thermal
grease and you do not need to apply new thermal grease.
Note: To ensure the best performance, check the manufacturing date on the new heat sink and
make sure it does not exceed two years. Otherwise, wipe off the existing thermal grease and
apply new thermal grease.
• If you are replacing the processor and reusing the heat sink, do the following steps to apply
thermal grease:
1. If there is any old thermal grease on the heat sink, wipe off the thermal grease with an
alcohol cleaning pad.
2. Carefully place the processor and carrier in the shipping tray with the processor-contact
side down. Make sure the triangular mark on the carrier is oriented in the shipping tray as
shown below.
3. Apply the thermal grease on the top of the processor with syringe by forming four uniformly
spaced dots, while each dot consists of about 0.1 ml of thermal grease.
Figure 110. Thermal grease application with processor in shipping tray
Step 4. Assemble the processor and heat sink.
a. Align the triangular mark on the heat sink label with the triangular mark on the processor carrier
and processor.
b. Install the heat sink onto the processor-carrier.
c. Press the carrier into place until the clips at all four corners engage.
d. Visually inspect to make sure that there is no gap between the processor carrier and the heat
sink.
.
Chapter 5 Hardware replacement procedures
175