Lenovo System x3250 M5 Installation And Service Manual page 259

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 in "Safety" on page v.
• Read the "Installation guidelines" on page 31.
• Read "Handling static-sensitive devices" on page 33.
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.
Figure 172. Thermal grease on microprocessor
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.
Figure 173. Thermal-grease syringe
Note: 0.01 mL is one tick mark on the syringe. If the grease is properly applied, approximately half
(0.22 mL) of the grease will remain in the syringe.
Step 6. Install the heat sink onto the microprocessor as described in "Replacing a microprocessor and
heat sink" on page 242.
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Chapter 6 Removing and replacing server components
245