6. Follow the following sequence to remove the four screws that secure the heat sink and fan assemblyto 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 thesystem board. The four screws cannot be removed from the heat sink and fan assembly.Figure115. Removing the heat sink and fan assembly7. 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.8. Position the new heat sink and fan assembly on the system board so that the four screws are alignedwith the holes on the system board.Note: Ensure that the heat sink and fan assembly cable is toward the microprocessor fan connectoron the system board.9. Follow the following sequence to install the four screws to secure the new heat sink and fan assembly.Do not over-tighten the screws.a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 .10. Connect the heat sink and fan assembly cable to the microprocessor fan connector on the systemboard. See “Parts on the system board” on page 35.What to do next:• To work with another piece of hardware, go to the appropriate section.• To complete the installation or replacement, go to “Completing the parts replacement” on page 189.162 ThinkStation P510 and P710 Hardware Maintenance Manual
