Use a Phillips #1 screwdriver to mechanically release the board from the system card cage.
Insert the screwdriver into each quarter-turn access slot (the slots are located on the left and right sides of the board front panel) and then turn a quarter turn so that the arrow points to the unlocked position (Figure 4-7).
Unfasten any cable connectors from the front panel and set them aside.
Label cables to identify them for reconnection later.
Pull the ends of both extraction levers outward simultaneously to unseat the board from the centerplane receptacles (Figure 4-8).
If a board is not immediately replaced, a load board (Enterprise 6500 systems only) or a filler panel (Enterprise 4500 and 5500 systems only) must be installed in its place before powering on the system.