Lenovo ThinkSystem SR550 Maintenance Manual page 157

2) Holding the inserted end of the processor in place, flex the opposite end of the retainer down
and away from the processor until you can press the processor under the clip on the retainer.
To prevent the processor from falling out of the retainer after it is inserted, keep the processor-
contact side up and hold the processor-retainer assembly by the sides of the retainer.
3) If there is any old thermal grease on the processor, gently clean the top of the processor using
an alcohol cleaning pad.
Note: If you are applying new thermal grease on the top of the processor, make sure to do it
after the alcohol has fully evaporated.
3. If you are replacing a processor:
a. Remove the processor identification label from the heat sink and replace it with the new label that
comes with the replacement processor.
b. To ensure the best performance, check the manufacturing date on the new heat sink and make sure
it does not exceed 2 years. Otherwise, wipe off the existing thermal grease and apply the new grease
onto it for optimal thermal performance.
c. 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 118. Proper shape of the thermal grease
4. If you are replacing a heat sink, remove the processor identification label from the old heat sink and
place it on the new heat sink in the same location. The label is on the side of the heat sink closest to the
triangular alignment mark.
If you are unable to remove the label and place it on the new heat sink, or if the label is damaged during
transfer, write the processor serial number from the processor identification label on the new heat sink in
the same location as the label would be placed using a permanent marker.
5. Assemble the processor and heat sink, if these components are separate.
Notes:
• If you are replacing a processor, install the heat sink onto the processor and retainer while the
processor and retainer are in the shipping tray.
• If you are replacing a heat sink, remove the heat sink from its shipping tray and place the processor
and retainer in the opposite half of the heat sink shipping tray with the processor-contact side down.
To prevent the processor from falling out of the retainer, hold the processor-retainer assembly by its
sides with the processor-contact side up until you turn it over to fit in the shipping tray.
.
Chapter 3 Hardware replacement procedures
149