PWR1911

The following steps are for the system unit, unless other instructions are given. Please refer to Power isolation procedures for important safety information before servicing the system.

1. If an uninterruptible power supply is installed, verify that it is powered on before proceeding.
2. Are all the units powered on?
   • Yes: Go to step 7.
   • No: On the unit that does not power on, perform the following:
     1. Disconnect the ac line cords from the unit that does not power on.
     2. Use a multimeter to measure the ac voltage at the system end of both ac line cords.

        Table 31. Correct ac voltage

        Model or expansion unit	Correct ac voltage
        5095, 0595, and 7311-D20 expansion units	100V to 127V or 200V to 240V
        9117-MMA processor and 5796, 7314-G30 expansion units	200V to 240V
        5088, 0588, 5094, 5294, 5790, and 7311-D11 expansion units	200V to 240V ac or dc

     3. Is the voltage correct (refer to Table 31)?
        • Yes: Continue with the next step.
        • No: Go to step 6.
3. Are you working on a model 9117-MMA, 5095, 0595, 5790, 5796, 7314-G30, 7311-D11, or 7311-D20 ?
   • No: Continue with the next step.
   • Yes: Perform the following:
     1. Reconnect the ac line cords.
     2. Verify that the failing unit fails to power on.
     3. Replace the failing power supply. Use the table below to determine which power supply needs replacing, and then see Locating FRUs for its location, part number, and exchange procedure.

        Table 32. Failing power supply

        Reference code	Models or expansion units	Failing item name
        1510	9117-MMA	Power supply 1
        	5095, 0595, 5790, 5796, 7314-G30, 7311-D11, 7311-D20	Power supply 1
        1520	9117-MMA	Power supply 2
        	5095, 0595, 5790, 5796, 7314-G30, 7311-D11, 7311-D20	Power supply 2

        This ends the procedure.

4. Perform the following:
   1. Reconnect the ac line cord to the ac modules.
   2. Remove the ac jumper cables at the power supplies.
   3. Use a multimeter to measure the ac voltage at the jumper cable power supply end.

   Is the ac voltage from 200V to 240V?

   • No: Continue with the next step.
   • Yes: Replace the failing power supply. Use the table below to determine which power supply needs replacing, and then see Locating FRUs for its location, part number, and exchange procedure.
     Attention: Do not install power supplies P00 and P01 ac jumper cables on the same ac module.

     Table 33. Failing power supply

     Reference code	Failing item name
     1500	Power supply 0
     1510	Power supply 1 for 5094 or 5294 Power supply 2 for 5088 or 0588
     1520	Power supply 2 for 5094 or 5294 Power supply 1 for 5088 or 0588
     1530	Power supply 3

     This ends the procedure.

5. Perform the following:
   1. Disconnect the ac jumper cable at the ac module output.
   2. Use a multimeter to measure the ac voltage at the ac module output.

   Is the ac voltage from 200V to 240V?

   • Yes: Exchange the ac jumper cable.

     This ends the procedure.

   • No: Exchange the ac module (see Locating FRUs).

     This ends the procedure.

6. Perform the following:
   1. Disconnect the ac line cords from the customer's ac power outlet.
   2. Use a multimeter to measure the ac voltage at the customer's ac power outlet.

   Is the ac voltage correct (refer to Table 31)?

   • Yes: Exchange the failing ac line cord.

     This ends the procedure.

   • No: Perform the following:
     1. Inform the customer that the ac voltage at the power outlet is not correct.
     2. Reconnect the ac line cords to the power outlet after the ac voltage at the power outlet is correct.

        This ends the procedure.

7. Is the reference code 1xxx-00AC?
   • No: Continue with the next step.
   • Yes: This reference code may have been caused by an ac outage. If the system will power on without an error no parts need to be replaced.

     This ends the procedure.

8. Is the reference code 1xxx-1510 or 1520?
   • No: Continue with the next step.
   • Yes: Perform the following:
     1. Use the following table, figures and Locating FRUs to locate the failing parts.

        Table 34. Power Reference Code Table

        Model or expansion unit	Reference code	Locate these parts
        9117-MMA	1xxx 1510	Power supply E1 and ac line cord 1
        	1xxx 1520	Power supply E2 and ac line cord 2
        5088 and 0588 (see Figure 2)	1xxx 1510	ac jumper cable connected to power supply 2 and the ac module
        	1xxx 1520	ac jumper cable connected to power supply 1 and the ac module
        5294 and 5094 (see Figure 1)	1xxx 1500	ac jumper cable connected to power supply 0 and the ac module
        	1xxx 1510	ac jumper cable connected to power supply 1 and the ac module
        	1xxx 1520	ac jumper cable connected to power supply 2 and the ac module
        	1xxx 1530	ac jumper cable connected to power supply 3 and the ac module
        5095 and 0595	1xxx 1510	Power supply 1 and ac line cord 1
        	1xxx 1520	Power supply 2 and ac line cord 2
        5790, 5796, 7314-G30, 7311-D11, 7311-D20	1xxx 1510	Power supply E1 and ac line cord 1
        	1xxx 1520	Power supply E2 and ac line cord 2

        Figure 1. Dual line cord drawing for 5094

        
        Figure 2. Dual line cord drawing for 5088, or 0588 installed on 5094

        
     2. Locate the ac line cord or the ac jumper cable for the reference code you are working on.
        Attention: Do not disconnect the other system line cord when powered on.
     3. Go to step 10.
9. Is the reference code 1xxx 1500 or 1xxx 1530?
   • No: Perform problem analysis uding the reference code.

     This ends the procedure.

   • Yes: Locate the ac jumper cables for the reference code you are working on (see Table 34), and then continue with the next step:
     Attention: Do not disconnect the other ac jumper cable when powered on.
     • If the reference code is 1xxx 1500, determine the locations of ac jumper cables that connect to power supply P00 (see the preceding figures).
     • If the reference code is 1xxx 1530, determine the locations of ac jumper cables that connect to power supply P03 (see the preceding figures).
10. Perform the following:
    1. For the reference code you are working on, disconnect either the ac jumper cable or the ac line cord from the power supply.
    2. Use a multimeter to measure the ac voltage at the power supply end of the ac jumper cable or the ac line cord.

    Is the ac voltage correct (see Table 31)?

    • No: Continue with the next step.
    • Yes: Exchange the failing power supply. Refer to Table 32 and Table 33 for its position, and then see Locating FRUs for part numbers and directions to the correct exchange procedures. This ends the procedure.
11. Perform the following:
    1. Disconnect the ac line cords from the power outlet.
    2. Use a multimeter to measure the ac voltage at the customer's ac power outlet.

    Is the ac voltage correct (see Table 31)?

    • Yes: Exchange the following, one at a time:
      • failing ac line cord
      • failing ac jumper cable (if installed)
      • failing ac module (if installed) (see Locating FRUs for part numbers and directions to the correct exchange procedures)

      This ends the procedure.

    • No: Perform the following:
      1. Inform the customer that the ac voltage at the power outlet is not correct.
      2. Reconnect the ac line cords to the power outlet after the ac voltage at the power outlet is correct.

         This ends the procedure.