Lenovo 4263, 4271, 4272, 4269 Carefully lift the heat sink and fan assembly off the system board

7.Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board:

a.Partially remove screw 1, then fully remove screw 2, and then fully remove screw 1.

b.Partially remove screw 3, then fully remove screw 4, and then fully remove screw 3.

Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 28. Removing the heat sink and fan assembly

8.Carefully lift the heat sink and fan assembly off the system board.

Notes:

a.You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.

b.Do not touch the thermal grease while handling the heat sink and fan assembly.

9.Remove the plastic cover from the bottom of the new heat sink and fan assembly to expose the thermal grease (this cover protects the thermal grease from contamination).

Notes:

a.Do not remove the plastic cover until you are ready to install the heat sink and fan assembly on the microprocessor.

b.Do not touch the thermal grease on the heat sink and fan assembly.

c.Do not put the heat sink and fan assembly anywhere except on the microprocessor after the plastic cover has been removed and the thermal grease exposed.

Chapter 2. Installing or replacing hardware 33