IBM 7870B4U, Service Manual

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b. Loosen the screws and remove the retention bracket, then disconnect the
cable from the expansion-unit system board (B).
c.
Locate the tray-release button on the bottom of the expansion unit.
Tray release
button
d. Press in and hold the tray-release button; then, pull the expansion-unit riser
assembly out of the expansion-unit system board.
6.
Carefully turn over the expansion-unit riser assembly, and use a Phillips
screwdriver to remove the four non-captive retaining screws, as shown in the
following illustration. Store the screws in a safe location.
Chapter 5. Removing and replacing blade server components
87