Exchanging the system backplane in the model 9111-285, 9131-52A, 9405-520, 9406-520, 9111-520, 9407-515, and 9406-525

How to remove and replace the system backplane.

Use this procedure to remove and replace a 9111-285, 9131-52A, 9405-520, 9406-520, 9111-520, 9407-515, and 9406-525 system backplane.

To complete these procedures, you might also need to perform removal and replacements from these topics:

Control panel
Removable media enclosure
Fan assembly
Power supplies
Voltage regulators
Disk drives and disk drive backplanes
PCI adapters and dividers
Service processor
SCSI RAID backplane

If you are planning to use this information in printed form, be sure to print all of the information you need. You can find all of the information, in both HTML or PDF format, in the Installing features and parts topic.

Before performing the following procedures, read the System Safety Inspection.

Attention: If you are servicing a rack-mounted system unit, it is strongly recommended that you remove the system drawer from the rack. If you are servicing a stand-alone system unit, place the system on a flat and stable surface on its side. To avoid potential breakage, the system front foot must not be resting on the surface.

Removing the system backplane

Attention: Before you remove or disconnect any components, note where they are connected or installed in the system.

If you are removing the system backplane as part of another procedure, continue to the next step. If you are removing the system backplane because it is not operational, verify that it is the failing part. See Identify a failing part.
Perform the following to prepare the system:
1. Ensure that the customer has taken appropriate actions to remove the server from normal use.
2. Power off the system. For instructions, see Stopping the system.
3. Disconnect the power source from the system.
  Note: This system might be equipped with a second power supply. Before continuing with this procedure, ensure that the power source to the system has been completely disconnected.
4. Attach a wrist strap to a metal surface of your hardware to prevent electrostatic discharge from damaging your hardware. If you do not have a wrist strap, touch a metal surface of the system before installing or replacing hardware.
  Note: Follow the same precautions that you would use if you were not using the wrist strap. A wrist strap is for static control. It will not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
Remove the front cover.
Label and disconnect all other cables located at the rear of the system.
Place it in the service position.
Remove the service access cover.
Record the slot number and location of each adapter that is installed in the server.
Remove the PCI adapters (see Removing the PCI adapter with the system power off).
Remove the PCI adapter dividers (see Removing a PCI adapter).
Remove both power supplies, if two are present in the system, or remove the power supply and filler (see Removing the power supply).
Remove the service processor assembly and time-of-day battery.
Remove the media-device enclosure.
Note: If there is a cable from the media bay enclosure to the control panel, unplug the cable as you remove the control panel from the media bay enclosure.
Remove the VPD card (see Exchanging the VPD card).
Remove the voltage regulator module (see Remove the voltage regulator module).
Remove the disk drives (see Remove a disk drive).
Remove the fan tray assembly.
Remove the disk drive backplanes (see Replace a disk drive backplane).
Remove memory modules.
Remove the 7 hex-head screws holding the power supply bay chassis bracket as shown in the following illustration.
1 Power supply bay chassis bracket 4 System chassis (shown in service position)

2 Blue thumbscrew 5 Hex-head screw (7)

3 System backplane (shown with voltage regulator modules attached)
Remove the power supply bay chassis bracket.
Remove the blue thumbscrew holding the system backplane to the chassis. Do not remove any other screws from the backplane. The blue thumbscrew is the only screw that needs to be removed in order to release the backplane from the chassis.
Attention: Use care when removing the system backplane. Standoffs attached to the chassis base might damage the components attached to the bottom of the system backplane. Do not lift the system backplane by any of the attached modules.
To remove the system backplane from the chassis, lift the front edge of the system backplane and pull it towards the front of the system. Lift the system backplane up and out of the system chassis.
Place the system backplane in a safe place.

Replacing the system backplane

To replace the system backplane, do the following:

Attach a wrist strap to a metal surface of your hardware to prevent electrostatic discharge from damaging your hardware. If you do not have a wrist strap, touch a metal surface of the system before installing or replacing hardware.
Note: Follow the same precautions that you would use if you were not using the wrist strap. A wrist strap is for static control. It will not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
If necessary, remove the system backplane from the antistatic package.
Carefully grasp the system backplane along two edges.
Lower the system backplane at an angle, so that the rear of the backplane connects with the system chassis first.
Attention: Use care when replacing the system backplane. Standoffs attached to the chassis base may damage the components attached to the bottom of the system backplane.
Slide the system backplane toward the back of the system chassis, and align the retaining screw hole with the mating screw hole located on the system chassis.
Replace the thumbscrew that secures the system backplane to the system chassis.
Replace the power supply bay chassis bracket. Insert and tighten the 7 hex-head screws.
Replace the memory modules.
Replace the disk drive backplanes (see Replace a disk drive backplane).
Replace the fan tray assembly.
Replace the disk drives (see Replace a disk drive).
Replace the VPD card (see Exchanging the VPD card).
Replace the voltage regulator module (see Replace the voltage regulator module).
Replace the media-device enclosure.
Note: If there is a cable from the media device enclosure to the control panel, reconnect the control panel cable as you install the media device enclosure.
Replace the service processor assembly and time-of-day battery.
Replace both power supplies, if two were present in the system, or replace the power supply and filler (see Replacing the power supply).
Replace the PCI adapter dividers (see Replace a PCI adapter divider).
Replace the PCI adapters (see Replacing the PCI adapter with the system power off).
Replace the service access cover.
Replace the front cover.
Place it in the operating position.
Reconnect all signal and power cables to the back of the system.
Reconnect the power source to the system.
Perform the following to set the configuration ID and MTMS values:
1. Use the HMC or PC Web browser to access the ASMI (see Accessing the Advanced System Management Interface).
2. Follow the instructions in Changing processing unit power control network identifier to update the processing unit power control network ID. Change the identifier to B4.
3. Follow the instructions in Setting the system enclosure type to change the system enclosure type.
Start the system.
If you replaced the system backplane as part of another procedure, return to that procedure now. If you replaced it because it was not operational, verify that the new resource is functional. See Verifying the repair.

1	Power supply bay chassis bracket	4	System chassis (shown in service position)
2	Blue thumbscrew	5	Hex-head screw (7)
3	System backplane (shown with voltage regulator modules attached)