IBM BladeCenter T Type 8720 - Manual (Page 89)

Backplane
Complete the following steps to replace the backplane in your BladeCenter T unit
Note:
v Read “Installation guidelines” on page 37.
v Read the safety notices at ″Safety information ″ on page 113.
v Read “Handling static-sensitive devices” on page 40.
1. Shut down the system, and remove power from the system (see “Shutting
down the BladeCenter T unit” on page 21).
2. For Type 8720 (dc) systems, remove the power connections to each of the dc
terminals. For Type 8730 (ac) systems, remove each power cord from the
input power connections on the rear of the BladeCenter T unit.
3. Remove the power modules from the bays at the front of the unit.
Note: The power modules dock into the docking board on the assembly and
must be removed before you can remove the assembly.
4. At the rear of the unit, remove all four blowers from both docking board/blower
housing assemblies (see “Removing a blower module” on page 55).
5. Remove the KVM module from the rear of the system (see “Removing the
KVM module” on page 57).
6. Remove the LAN module from the rear of the system (see “Removing the LAN
module” on page 59).
7. Remove all I/O switches and switch fillers from the rear of the unit.
8. For a Type 8720 unit, remove the dc terminal covers and the dc rear panel
from the rear of the unit (see “DC Rear Panel” on page 70). For a Type 8730
unit, remove the ac rear panel from the rear of the unit (see “AC rear panel” on
page 69).
9. Remove the two upper flex circuit assemblies (see “Upper flex circuit
assembly” on page 71) and the two lower flex circuit assemblies (see “Lower
flex circuit assembly” on page 72).
10. For each docking board/blower housing assembly, loosen the two captive
fasteners located above and below the power inlet receptacles (Type 8730) or
DC terminals (Type 8720).
11. Grab the left docking board/blower assembly housing by the frame and
carefully pull the housing out from the system chassis.
12. Grab the right docking board/blower assembly housing by the frame and
carefully pull the housing out from the system chassis
13. Loosen the four captive fasteners on the rear chassis stiffener bracket.
14. Pull the rear chassis stiffener bracket off the chassis.
Chapter 5. Service replaceable units 79