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 155
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