PWR1904

• Yes: Continue with the next step.
• No: Go to step 5.

• No: Continue with the next step.
• Yes: Go to step 4.

1. Power off the system.
2. Replace one of the memory DIMMs on the processor cards (see Locations — model 561 and 570).
3. Power on the system.
4. Has this resolved the problem?
   • No: Continue with step 3.e.
   • Yes: This ends the procedure.
5. Have you replaced all of the DIMMs?
   • No: Repeat step 3 and replace the next memory DIMM.
   • Yes: Go to step 4.

1. Is the system a model 561 with a voltage regulator configuration that is not redundant (one voltage regulator card and one processor card or two voltage regulator cards and two processor cards)?
   • No: Continue with step 4.b.
   • Yes: Go to step 8.
2. Power off the system.
3. Replace one of the processor cards (see Locations — model 561 and 570).
4. Power on the system.
5. Has this resolved the problem?
   • No: Continue with step 4.f.
   • Yes: This ends the procedure.
6. Have you replaced all of the processor cards?
   • No: Repeat step 4 and replace the next processor card.
   • Yes: Continue with step 4.g.
7. Is the system a model 561 with a voltage regulator configuration that is not redundant (one voltage regulator card and one processor card or two voltage regulator cards and two processor cards)?
   • No: Go to step 8.
   • Yes: Replace the regulator distribution connection backplane (see SYSBKPL). This ends the procedure.

1. Power off the system and disconnect the ac power cable from the unit you are working on.
2. Disconnect all of the I/O devices (tape, diskette, optical, and disk units) from the unit you are working on by sliding them partially out of the unit (see Locations — model 561 and 570).
3. Remove and label all cards (for example, PCI adapters, memory DIMMs, GX adapter(s), RIO/HSL and RAID cards if installed).
4. Reconnect the ac power cable to the unit you are working on.
5. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: Go to step 10.

1. Power off the system.
2. Replace one of the system fans (see Locations — model 561 and 570).
3. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: The fan you just replaced was the failing item.

  This ends the procedure.

• Yes: Reinstall all of the fans you replaced in step 6 and continue with the next step.
• No: Perform the following:
  1. Power off the system.
  2. Reinstall the fan that you just removed in step 6 to its original location.
  3. Repeat step 6.

1. Power off the system.
2. Replace one of the voltage regulator cards. See Locations — model 561 and 570
3. Power on the system.
4. Does a power reference code occur?
   • Yes: Continue with step 8.e.
   • No: The voltage regulator card you just replaced was the failing item. This ends the procedure.
5. Have all of the voltage regulator cards been replaced?
   • Yes: Continue with step 8.f.
   • No: Repeat step 8 and replace the next voltage regulator card.
6. Is the system a model 561 with a voltage regulator configuration that is not redundant (one voltage regulator card and one processor card or two voltage regulator cards and two processor cards)?
   • Yes: Go to step 4.b.
   • No: Continue with step 9.

1. Power off the system.
2. Reinstall all of the cards (PCI adapters, memory DIMMs, GX adapter(s), RIO/HSL and RAID cards) you removed in step 5 to their original locations.
3. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: Go to step 13.

1. Power off the system.
2. Disconnect one of the cards you reinstalled in step 10.
3. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: Exchange the last card you disconnected in this step (see Locations — model 561 and 570). This ends the procedure.

• No: Repeat step 11.
• Yes: Reinstall all of the parts you have removed or exchanged in this procedure and return to Start of call procedure. This ends the procedure.

1. Power off the system.
2. Reconnect all of the I/O devices (tape, diskette, optical, and disk units) that you disconnected in step 5.
3. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: The problem has been resolved. This ends the procedure.

1. Power off the system.
2. Disconnect one of the I/O devices (tape, diskette, optical, and disk units) that you reconnected in step 13.
3. Power on the system.

Does a power reference code occur?

• Yes: Continue with the next step.
• No: Exchange the last I/O device you disconnected in this step (see Locations — model 561 and 570). This ends the procedure.

• No: Repeat step 14.
• Yes: Reinstall all of the parts you have removed or exchanged in this procedure and return to Start of call procedure. This ends the procedure.