Lenovo ThinkStation P300 (English) User Guide - Small Form Factor - Page 112
a. Partially tighten screw
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Figure 49. Removing the heat sink fan duct 9. Position the new heat sink and fan assembly on the system board so that the four screws are aligned with the holes on the system board. Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is toward the microprocessor fan connector on the system board. 10. 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 . 11. Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system board. See "Locating parts on the system board" on page 6. 12. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. Figure 50. Installing the heat sink fan duct 100 ThinkStation P300 User Guide