5. Place the heat sink and fan assembly on the system board so that the four screws on the heat sink andfan assembly are aligned with the corresponding mounting studs on the system board. Make sure thatyou properly place the heat sink and fan assembly so that you can easily connect the heat sink and fanassembly cable to the system fan 2 connector (if the heat sink and fan assembly is for microprocessor 1)or the system fan 1 connector (if the heat sink and fan assembly is for microprocessor 2) on the systemboard. See “Locating parts on the system board” on page 33.Note: Note the orientation of the heat sink and fan assembly by referring to the arrow label on the topof the heat sink and fan assembly. The arrow, which indicates air flow, should point to the rear ofthe chassis.Figure67. Screws that secure the heat sink and fanassembly for microprocessor 1Figure68. Screws that secure the heat sink and fanassembly for microprocessor 26. Alternate tightening each screw a small and equal amount until the heat sink and fan assembly issecured to the system board. Do not over-tighten the screws.7. Connect the heat sink and fan assembly cable to the system fan 2 connector (if the heat sink and fanassembly is for microprocessor 1) or the system fan 1 connector (if the heat sink and fan assembly is formicroprocessor 2) on the system board. See “Locating parts on the system board” on page 33.8. To complete the installation, go to “Completing the parts replacement” on page 122.Removing or installing a front fanThis section provides instructions on how to remove or install a front fan.Removing a front fanAttention:Do not open your server or attempt any repair before reading and understanding the Safety Information and theWarranty and Support Information on the ThinkServer Documentation DVD that came with your product, and“Guidelines” on page 39. To obtain a copy of the publications, go to:http://www.lenovo.com/supportChapter 5. Replacing FRUs 101
