IBM 8852 - BladeCenter H Rack-mountable Service Manual page 70

2. If your BladeCenter H chassis hardware is version v8 or later, install midplane
Attention: The different midplane FRUs are not interchangeable. A failed
midplane FRU should only be replaced with a midplane having the same FRU part
number.
Removing the midplane
To remove the midplane, complete the following steps.
Screws (15)
56
BladeCenter H Type 8852, 7989, and 1886: Problem Determination and Service Guide
FRU 44X2302. There is no BladeCenter H chassis hardware version v7.
1. Read the safety information that begins on page v and "Installation
guidelines" on page 29.
2. Shut down the operating systems and turn off any blade servers in the
BladeCenter unit. See the documentation that comes with the blade server for
detailed instructions.
3. Disconnect the power from the BladeCenter unit (see "Disconnecting power
from the BladeCenter unit" on page 9).
4. Remove the shuttle from the BladeCenter unit (see "Removing the shuttle" on
page 50).
5. Disconnect the rear LED/serial connector assembly cable from the midplane
connector.
6. Remove the guide pin on the right side of the midplane, above the media tray
connector.
7. Loosen the captive thumbscrew on the upper ac cable bracket.
8. Remove the 15 screws that secure the midplane to the shuttle. Rotate the
upper ac cable bracket up as needed to access the upper midplane screws.
9. Rotate the upper ac cable bracket up and hold it in position; then, pull the top
of the midplane away from the shuttle. Lift the cables from the upper ac cable
bracket as necessary to provide clearance for the midplane.
Upper AC
cable bracket
Guide pins
Guide pin
Locating tabs
Lower AC cable bracket
Media tray connector