Lenovo 30BY User Manual page 112

b. Follow the following sequence to remove the four screws that secure the heat-sink-and-fan
assembly to the system board:
• Partially remove screw
• Partially remove screw
Note: Carefully remove the four screws to avoid any possible damage to the system board. The four
screws cannot be removed from the heat-sink-and-fan assembly.
Figure 77. Removing the heat-sink-and-fan assembly
c. Lift the failing heat-sink-and-fan assembly off the system board.
Notes:
• You might have to gently twist the heat-sink-and-fan assembly to free it from the microprocessor.
• Do not touch the thermal grease while handling the heat-sink-and-fan assembly.
5. To install the heat-sink-and-fan assembly, do the following:
a. Apply appropriate amount of thermal grease to the new heat-sink-and-fan assembly.
b. Position the heat-sink-and-fan assembly on the system board. Ensure that the four screws are
aligned with the holes in the system board.
Note: Ensure that the heat-sink-and-fan assembly cable is toward the microprocessor fan connector
on the system board.
c. Follow the following sequence to install the four screws to secure the new heat-sink-and-fan
assembly. Do not over-tighten the screws.
• Partially tighten screw
• Partially tighten screw
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P520c User Guide
a , then fully remove screw
c , then fully remove screw
a , then fully tighten screw
c , then fully tighten screw
b , and then fully remove screw
d , and then fully remove screw
b , and then fully tighten screw
d , and then fully tighten screw
a .
c .
a .
c .