12. Install the top cover (see “Replacing the top cover” on page 107).
13. Slide the server into the rack.
14. Reconnect the external cables; then, reconnect the power cords and turn on
the peripheral devices and the server.
Thermal grease:
This topic provides instructions for how to replace damaged or contaminated
thermal grease on the microprocessor and heat sink.
The thermal grease must be replaced whenever debris is found in the grease.
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 alcohol wipe from its package and unfold it completely.
3. Use the alcohol wipe to clean 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 alcohol wipe to clean the thermal grease from the
microprocessor; then, dispose of the alcohol wipe after all of the thermal grease
is removed.
Microprocessor
0.02 mL of thermal
grease
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 5
mm of the edge.
Note: 0.01 mL is one tick mark on the syringe. If the grease is properly applied,
approximately half of the grease will remain in the syringe.
6. Install the heat sink onto the microprocessor as described in “Installing a
microprocessor and heat sink” on page 165.
170 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
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