Lenovo NeXtScale nx360 M5, Installation And Service Manual, Page: 224 / 1022

• Do not touch the thermal grease on the bottom of the heat sink after you remove the plastic
cover. Touching the thermal grease will contaminate it. See “Thermal grease” on page 210
for more information.
Heat sink Thermal grease
Figure 150. Thermal grease
a. Remove the plastic protective cover from the bottom of the heat sink.
b. Position the heat sink over the microprocessor. The heat sink is keyed to assist with proper
alignment.
Heat sink for cpu 2
Microprocessor
Heat sink for cpu 1
Figure 151. 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. Tighten the four screws on the corners of the microprocessor retainer
Step 9. Reinstall the air baffle (see “Replacing the air baffle” on page 117).
Step 10. Install the cover (see “Installing the compute node cover” on page 115).
Step 11. Slide the server into the rack.
Step 12. Reconnect the power cords and any cables that you removed.
Step 13. 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.
210
Lenovo NeXtScale nx360 M5 Installation and Service Guide