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.
To replace damaged or contaminated thermal grease on the microprocessor and
heat exchanger, complete the following steps:
1. Place the heat-sink assembly 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
exchanger.
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.
Microprocessor
0.02 mL of thermal
grease
5. Use the thermal-grease syringe to place nine uniformly spaced dots of 0.02 mL
each on the top of the microprocessor.
Note: 0.01mL 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.
6. Continue with step4c on page 227 of the “Installing a microprocessor and heat
sink” on page 223 procedure.
Removing the system board
To remove the system board, complete the following steps.
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 133.
2. Turn off the server, and disconnect all power cords and external cables.
3. Remove the cover (see “Removing the cover” on page 145).
4. If you have the optional hot-swap rear hard disk drive cage installed, rotate it
up (see “Rotating the optional hot-swap rear hard disk drive cage up” on page
147).
5. Remove the air baffle (see “Removing the air baffle” on page 148).
228 IBM System x3630 M3 Type 7377: Problem Determination and Service Guide
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