Lenovo 3719, 3821, 3822, 3823 manual Thermal grease

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 sink, complete the following steps:

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: 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

0.02mL 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 approximately 5 mm of the edge. This is to ensure uniform distribution.

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.

6.Install the heat sink onto the microprocessor as described in “Installing a microprocessor and heat sink” on page 220.

226ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual