Figure 128. Heat sink installation
d. Rotate the heat-sink release lever to the closed position and hook it underneath the lock tab.
Step 6. If you installed the second microprocessor, install the sixth fan (see
“Installing a hot-swap fan
assembly” on page 461
).
Step 7. If you removed the microprocessor 2 air baffle, install it (see
“Installing the microprocessor 2 air
baffle” on page 427
).
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.
When you are installing the heat sink on the same microprocessor that is 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 417.
• Read
“Handling static-sensitive devices” on page 419.
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.
506
System x3550 M3Problem Determination and Service Guide
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