Lenovo ThinkStation P520 User Manual page 130

3. Lift the plastic PCIe card latch at the rear of the computer. Then, pivot the latch outward to rest it on the
edge of the rear panel.
Figure 102. Opening the PCIe card latch
4. Pull and pivot the tab on the front fan assembly as shown to open the latch inside.
Figure 103. Opening the latch in the front fan assembly
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P520 User Guide