IBM iSeries Series Hardware Problem Analysis And Isolation page 167

b. Remove the power supply from the system unit and replace it with the new one.
c. Power on the system.
Does a power reference code occur?
v Yes: Perform the following:
a. Remove the new power supply that was installed in step 6 (See page 154) and reinstall the
original power supply.
b. Replace the backplane. See symbolic FRU "BACKPLN" on page 284.
This ends the procedure.
v No: The power supply that was removed earlier in this step was the failing item.
This ends the procedure.
7. Perform the following:
a. Reinstall all of the cards you removed in step 2 (See page 154).
b. Power on the system.
Does a power reference code occur?
v Yes: Continue with the next step.
v No: Go to step 9 (See page 155).
8. Perform the following:
a. Power off the system.
b. Disconnect one of the cards you reinstalled in step 7 (See page 155).
c. Power on the system.
Does a power reference code occur?
v Yes: Have you disconnected all the cards?
– No: Repeat this step.
– Yes: Install all parts removed in this procedure and go to "Starting point for all problems" on
page 2.
This ends the procedure.
v No: Exchange the last card you disconnected in this step. See the Remove and replace
procedures for the model you are working on.
This ends the procedure.
9. Perform the following:
a. Power off the system.
b. Reconnect all of the I/O devices (tape, diskette, or disk units) that you disconnected in step 2
(See page 154).
c. Power on the system.
Does a power reference code occur?
v Yes: Continue with the next step.
v No: The system is working. The problem seems to be intermittent.
This ends the procedure.
10. Perform the following:
a. Power off the system.
b. Disconnect one of the I/O devices (tape, diskette, or disk units) that you connected in step 9 (See
page 155).
c. Power on the system.
Does a power reference code occur?
v Yes: Have you disconnected all the I/O devices?
Analyze hardware problems
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