Lenovo ThinkStation P520 Hardware Maintenance Manual page 174

a. Pull the front fan assembly by the handle to slide it out of the computer chassis.
Note: When you slide out the front fan assembly, avoid pulling the front-fan-assembly cable.
Figure 120. Removing the front fan assembly
b. Disconnect the front-fan-assembly cable from the front-fan-assembly connector on the system
board.
4. To install a new front fan assembly, do the following:
a. Connect the cable of the new front fan assembly to the front-fan-assembly connector on the system
board. See "Parts on the system board" on page 42.
b. Align the top and bottom edges of the new front fan assembly with the front-fan-assembly retainer in
the computer chassis. Then, slide the new front fan assembly inward until it is secured in position.
Figure 121. Installing the front fan assembly
5. Reinstall the M.2 solid-state drive holder, the full-length PCIe cards, the PCIe card retainer, and the
super capacitor module if you have removed them.
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P520 Hardware Maintenance Manual