IBM IntelliStation Z Pro 6221, Hardware Maintenance Manual

Page: 89 / 168

Thermal grease
This section contains information about removing and replacing the thermal grease
between the heat sink and the microprocessor. The thermal grease must be
replaced anytime 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.
Note: Read “Installation guidelines” on page 35, “Handling electrostatic
discharge-sensitive devices” on page 120, and “Safety information” on page
117.
Complete the following steps to replace damaged or contaminated thermal grease
on the microprocessor and heat sink:
1. Place the heat sink 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
sink.
Note: Be 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
0.01 mL of
thermal grease
5. Use the thermal grease syringe to place 16 uniformly spaced dots of 0.01 mL
each on the top of the microprocessor.
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 an
additional microprocessor” on page 57.
System board
Notes:
1. Read “Installation guidelines” on page 35, “Handling electrostatic
discharge-sensitive devices” on page 120, and “Safety information” on page
117.
FRU information (service only)
79