Sun Microsystems Enterprise 250 Owner's Manual page 176

3. Free the backplane from the six posts that support it at the rear of the disk cage.
Push down on the top edge of the backplane and pull it away from the posts.
4. Slide the backplane out of the opening at the base of the disk cage.
Place the backplane on an antistatic mat.
What Next
To replace the UltraSCSI backplane, complete this task:
"How to Install the UltraSCSI Backplane" on page 159
158 Sun Enterprise 250 Server Owner's Guide • June 1998