Lenovo 5457 Installation And Service Manual page 309

8. Reconnect any cables that you disconnected during the removal of the old microprocessor.
9. Rotate the rear adapter-retention bracket to the closed (locked) position.
10. Stand the server back up in its vertical position.
11. Install and lock the side cover (see
12. Reconnect the external cables and power cords; then, turn on the attached devices and turn on 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. Use this information to
replace damaged or contaminated thermal grease on the microprocessor and heat sink.
When you are installing the heat sink on the same microprocessor that the heat sink 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 in
• Read the "Installation guidelines" on page
• Read "Handling static-sensitive devices" on page
To replace damaged or contaminated thermal grease on the microprocessor and heat sink, complete the
following steps:
1. Place the heat sink on a clean work surface.
2. Remove the cleaning pad from its package and unfold it completely.
3. Use the cleaning pad to wipe the thermal grease from the bottom of the heat sink.
Note: Make sure that all of the thermal grease is removed.
4. Use a clean area of the cleaning pad to wipe the thermal grease from the microprocessor; then, dispose
of the cleaning pad after all of the thermal grease is removed.
5. Use the thermal-grease syringe to place nine uniformly spaced dots of 0.02 mL each on the top of the
microprocessor. The outermost dots must be within approximately 5 mm of the edge of the
microprocessor; this is to ensure uniform distribution of the grease.
Figure 228. Thermal grease distribution
Note: If the grease is properly applied, approximately half of the grease will remain in the syringe.
"Replacing the side cover" on page
"Safety" on page v.
31.
33.
Microprocessor
175).
0.02 mL of thermal
grease
.
Chapter 6 Removing and replacing components
297