PWR1907

1. Is the reference code you are working with 1xxx 913B?
   • No: Continue with the next step.
   • Yes: A system power control network (SPCN) firmware update is needed, but not started due to the SPCN Firmware Update Policy setting. A manual update needs to be started:
     Note:
     Do not perform maintenance on an expansion unit or modify the SPCN network while the SPCN firmware update is being performed.
     Note:
     Performing firmware updates or powering off the system will interrupt SPCN firmware updates and the firmware update will need to be started again after these actions.
   1. Access the advanced system management interface (ASMI) and select System Configuration and then Configure I/O Enclosures.
   2. Record the current SPCN Firmware Update Policy setting so it can be restored later.
   3. Change the SPCN Firmware Update Policy setting to Expanded and click on Save Policy Setting to allow SPCN firmware updates to be done over the RIO/HSL and serial SPCN interfaces.
   4. Select Start SPCN Firmware Update. The SPCN firmware will now be downloaded to the expansion units that require an update.
   5. Change the SPCN Firmware Update Policy setting back to what it was originally set to in step 1b and click on Save Policy Setting.
      Note:
      The SPCN firmware update can be stopped using the Stop SPCN Firmware Update button. However, to allow the expansion units to be updated to the latest SPCN firmware level, it is recommended that the firmware update be allowed to complete.

      The progress of the SPCN firmware update can be monitored by clicking on Configure I/O Enclosures to update the screen. Do not use the browser Back or Refresh button to monitor the update progress. The Power Control Network Firmware Update Status column shows the percentage complete and In Progress is displayed while the download is progresses. Not Required is displayed when the download process completes.

   This ends the procedure.
2. Is the reference code you are working with 1xxx 90F0?
   • No:Contact your next level of support.
   • Yes: A unit was dropped from the SPCN configuration.

     This can be caused by any of the following:

     • The rack or unit has lost all ac or dc power.
     • The SPCN function in the unit has an error.
     • The SPCN frame-to-frame cables, RIO cable or the remote I/O (RIO) adapter card has failed.
3. Using the HMC or ASMI, find the 1xxx 90F0 SRC in the error log (see Displaying error and event logs). Use the Show details option to display the location information for the failing unit.
4. After locating the failing unit, ensure that the SPCN frame-to-frame cable and RIO cables are seated correctly; reseat the cables if necessary.

   Are the cables connected correctly?

   • No: Correctly reconnect the cables, or replace them if necessary. This ends the procedure.
   • Yes: Continue with the next step.
5. Are the ac line cords on the failing unit connected properly at both ends?
   • No: Reconnect the ac line cords, or replace them if necessary. This ends the procedure.
   • Yes: Continue with the next step.
6. Check the voltage at the customer's ac outlet. Is the voltage correct?
   • No: Inform the customer that the voltage at the ac power outlet is incorrect. This ends the procedure.
   • Yes: Continue with the next step.
7. Are the power supplies functional?
   • No: Perform the following:
     1. Refer toLocating FRUs to determine the location and part number for each power supply, and to find the appropriate procedure for exchanging the power supplies.
     2. Replace each power supply, one at a time, until the problem has been resolved.
     3. If the problem persists after replacing all of the power supplies, continue with the next step.
   • Yes: Continue with the next step.
8. Use the table below to determine the FRUs to replace. Refer toLocating FRUs for instructions on replacing FRUs.This ends the procedure.

   Table 30.

   Enclosure	FRU
   5088, 0588	Tower backplane assembly
   5094, 5294, 8094-002	Tower backplane assembly
   5095, 0595	Tower backplane assembly
   7311-D11, 7314-G30, 5790 or 5796	I/O backplane
   7311-D20	I/O backplane