Lenovo 30BY User Manual page 82

5. If the PCIe card slot is a PCIe x16 card slot, press the retaining latch
Figure 19. Disengaging the retaining latch
6. To remove a full-length PCIe card, do the following:
a. Pivot the tab on the front fan assembly outward to open the latch inside.
Figure 20. Opening the latch on the front fan assembly
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P520c User Guide
1 as shown to disengage the latch.