Lenovo ThinkSystem ST550 7X09 Maintenance Manual page 174

b. Apply new thermal grease (1/2-syringe, 0.65 g) to the top of the new processor. If you have cleaned
the top of the processor with an alcohol cleaning pad, make sure to apply the new thermal grease
after the alcohol has fully evaporated.
Attention: You should use blue thermal grease (part number 01KP765) when replacing the
processor if that grease is available to your country. If it is not available, use gray thermal grease (part
number 41Y9292).
Figure 122. Thermal grease application
1) Carefully place the processor and retainer on a flat surface with the processor-contact side
down.
2) Apply half a syringe of thermal grease, approximately 0.65 g, to the center of the processor top.
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 closet 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 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.
• If you are replacing a processor where you have changed the processor retainer, you will install the
heat sink onto the processor and retainer outside of the shipping tray. To prevent the processor from
falling out of the retainer, hold the processor-retainer assembly by its sides with the processor-
contact side.
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ThinkSystem ST550 Maintenance Manual