I/O backplane

Use this procedure to service a 0595, 5095, or 7311-D20 I/O backplane.

1. Record the activated firmware level of the server for use in this procedure. The activated firmware level of the server can be found in the upper-right corner of the ASMI utility.
2. If this is a 7311-D20 expansion unit connected to a System p® server with an activated firmware level that is earlier than SF235, the partitions that own slots in the expansion unit must be powered off during this procedure. Power the partitions off now. This power-off action can be accomplished by powering off individual partitions, or powering off the server.
3. Power off the expansion unit.
4. Remove the ac power cord(s) from the expansion unit.
5. Place unit into service position

   Attention: When placing your system into the service position, all stability plates must be firmly in position to prevent the rack from tipping over. Ensure that only one system unit is in the service position at a time. Open the front rack door. If your system is equipped with two blue thumbscrews securing it to the rack, remove the thumbscrews (A) at this time. The screws are located on the right and left side of the bezel, just above each subsystem release latch. Release the subsystem release latches (B). Pull the system unit out from the rack until the rails are fully extended. Note: When the system rails are fully extended, safety latches on the slide rails lock into place. This action prevents the system from being accidentally pulled out too far and dropped.

6. If you are servicing a tower unit, remove the side cover.
7. Open the service access cover

   Open the front rack door and place the system into the service position. Loosen the three captive thumbscrews (A) located on the rear of the cover. Note: The service access cover pivots on a piano hinge located directly behind the four cooling blowers. To open the service access cover, lift the cover up from the back edge. The hinges allow the service access cover to swing open to about 170 degrees. Do not force the cover to come to a rest on top of the cooling blowers. Note: When you open the service access cover, ensure you have enough height clearance.

8. Remove the following:
   • PCI cards (see Peripheral component interconnect card)
   • RIO/HSL I/O bridge adapter
   • Card dividers
9. Remove the power supplies (see Power supply).
10. Remove the five screws (three from the side and two from the back) that hold the backplane to the expansion unit. Notice the aligning pins near the top of the board, and the power connections near the bottom of the board, for use later when you reinstall the board.
11. Install the new backplane by reversing the procedure described in step 5 to step 10.
12. Reconnect the power cord(s) and/or the power supply cords that you disconnected earlier.
    Note: If the server is powered on, the expansion unit will power on automatically.
13. Set the I/O enclosure configuration ID and MTMS value, and then continue with the next step of this procedure.
    Note: If this is a 7311-D20 expansion unit that is connected to a System p server that has an activated firmware level lower than SF235, and if the server is currently powered off, then it must be powered on to the firmware standby setting, not firmware running, when you are instructed to power on the server in the Setting expansion unit configuration ID and MTMS value dialog.
14. If this is a 7311-D20 expansion unit connected to a System p server with an activated firmware level that is lower than SF235, go to step 15. Otherwise, go to step 17.
15. If the server is HMC-managed, disconnect one of the SPCN cables from the expansion unit (only one of them). Wait 30 seconds, then reconnect it. For a server that is not managed by an HMC, this step can be omitted.
16. An SPCN microcode download to the expansion unit may or may not be occurring.
    • If an SPCN microcode download does not occur, go to step 17.
    • If an SPCN microcode download does occur, wait for the download to finish. Then power the server off and back on again. Partitions may be started at this time. Then go to step 17.
    • There are two ways to determine if an SPCN download is occurring:
      • Look at the Error/Event Logs using the ASMI utility
        • Expand System Service Aids.
        • Select Error/Event Logs.
        • A 1xxx9107 SRC in the informational logs section indicates that an SPCN download was started.
        • A 1xxx91DD SRC in the informational logs section indicates that an SPCN download completed.
      • Look at the expansion unit rack address using the ASMI utility.
        • Expand System Configuration.
        • Select Configure I/O Enclosures.
        • If the rack address for the expansion unit is a 1-byte value, an SPCN download is occurring.
        • If the rack address is a 2-byte value, the SPCN download has completed or is not needed.
17. Go to Verifying a repair.

    This ends the procedure.