Lenovo NeXtScale nx360 M5, Installation And Service Manual, Page: 225 / 1022

When you are installing the heat sink on the same microprocessor that it 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 that begins on “Safety” on page v.
• Read the “Installation guidelines” on page 101.
• Read “Handling static-sensitive devices” on page 103.
To replace damaged or contaminated thermal grease on the microprocessor and heat sink, complete the
following steps:
Step 1. Place the heat sink on a clean work surface.
Step 2. Remove the cleaning pad from its package and unfold it completely.
Step 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.
Step 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.
Step 5. Use the thermal-grease syringe to place 9 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.
Microprocessor
0.02 mL of thermal
grease
Figure 152. Thermal grease distribution
Note: If the grease is properly applied, approximately half of the grease will remain in the syringe.
Figure 153. Syringe
Step 6. Install the heat sink onto the microprocessor as described in Step 8 on page 209.
Chapter 5
.
Removing and replacing components
211