HP Integrity rx2660 User's & Service Manual page 164

5. Loosen the two captive screws. See
a. Press the blue button to release the black knob.
b. Turn the black knob counter-clockwise until the captive screw is free from the system
board.
Figure 60 Removing the I/O Backplane Assembly
6. Lift the assembly straight up and out of the server.
Figure 61 I/O PCI-X and PCIe/PCI-X Backplane Assembly Removed
164 Removing and Replacing Server Components
Figure 60 for the screw locations.