ACMODUL

Your server has suffered a power loss. This procedure will help you determine the source of the power loss condition that brought you here.

1. Are you working with a model 575 or 59x?
   • No: Continue with the next step.
   • Yes: Choose one of the following:
     • If you are here because of a 19" SPCN controlled expansion tower or drawer problem, continue with the next step.
     • If you are here because of a problem related to a 24" system unit, go to PWR1912.
2. Is the failing unit configured with a redundant power supply option (or dual line cord feature)?
   • No: Continue with the next step.
   • Yes: Go to PWR1911.
3. Are all the units powered on?
   • Yes: This error 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.
   • No: On the unit that does not power on, perform the following :
     1. Disconnect the ac line cord from the unit that does not power on.
     2. Use a multimeter to measure the ac voltage at the system end of the ac line cord.
     3. Is the ac voltage correct? (Refer to Table 1.)
        • Yes: Continue with the next step.
        • No: Go to step 7.

        Table 1. Correct AC voltage

        Model or expansion unit	Correct AC voltage
        Models 285, 505, 51x, 52x, 55x, 570, OpenPower® 710, and OpenPower 720 or 5095, 0595, and 7311-D20 expansion units	100V to 127V or 200V to 240V
        5074, 5079, 5088, 0588, 5094, 5294, 5790, 7311-D10, and 7311-D11 expansion units	200V to 240V

4. Are you working on model 285, 505, 51x, 52x, 55x, 570, OpenPower 710, OpenPower 720 or 5088, 0588, 5095, 0595, 5790, 7311-D10, 7311-D11 and 7311-D20 expansion unit?
   • No: Continue with the next step.
   • Yes: Perform the following:
     1. Reconnect the ac line cord.
     2. Verify that the failing system or tower fails to power on.
     3. Replace the failing power supply (refer to Table 2).

     Table 2. List of failing parts

     Model or expansion unit	Failing part(s)	Link to locations
     285 and 52x	Power supply E1	Locations — model 520, 52A, and 285
     505	Power supply E1	Locations — Model 505
     51x and OpenPower 710	Power supply E1	Locations — model 510 and OpenPower 710
     55x and OpenPower 720	Power supply E1	Locations — model 550, 55A, and OpenPower 720
     561 and 570	Power supply E1	Locations — model 561 and 570
     5074 and 5079 (single line cord)	Power supply P01 Power supply P02 Power supply P03 AC module A01	Locations — 5074, 8079-002, and 8093-002 expansion units or Locations — 5079 expansion unit
     5088 and 0588	Power supply P01	Locations — 0588 and 5088 expansion units
     5094	Power supply P01 Power supply P02 Power supply P03 AC module A01 AC module A02	Locations — 5094, 5294, and 8094-002 expansion units
     5095 and 0595	Power supply P01	Locations — 0595 and 5095 expansion units
     7311-D10, 7311-D11, 7311-D20, 5790	Power supply E1	Locations — 7311-D10 and 7311-D11 and 5790 expansion unit or Locations — 7311-D20 expansion unit

5. Perform the following:
   1. Reconnect the ac line cord to the ac module.
   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 (refer to Table 2). This ends the procedure.
6. 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?
   • No: Exchange the ac module (refer to Table 2). This ends the procedure.
   • Yes: Replace the ac jumper cable (refer to Power and signal cables). This ends the procedure.
7. Perform the following:
   1. Disconnect the line cord 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 1.)
   • 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. After the ac voltage at the power outlet is correct, reconnect the ac line cord to the power outlet. This ends the procedure.