Lenovo ThinkStation P520 30BE User Manual page 128

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 108. Opening the PCIe card latch
4. Pull and pivot the tab on the front fan assembly as shown to open the latch inside.
Figure 109. Opening the latch in the front fan assembly
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P520 User Guide