5) ac box
6) System unit backplane
c. Reconnect the ac power cables to the power source.
d. Attempt to power on the system.
e. If the system powers on, the FRU you exchanged is the failing item.
If the system does not power on, repeat steps 7a through 7e of this procedure
and exchange the next FRU in the list.
f. If the system does not power on after exchanging all the FRUs in the list, ask
your next level of support for assistance.
8. Perform the following:
a. Power off the system.
b. Attempt to power on the system.
Does the system power on?
No Go to step 7 of this procedure.
Yes Go to step 9 of this procedure.
9. Perform the following:
a. Power off the system.
b. Display the selected IPL mode on the system unit operator panel.
Is the selected mode the same mode the customer was using when the
power-on failure occurred?
No Go to step 10 of this procedure.
Yes Go to step 14 of this procedure.
10. Perform the following:
a. Power off the system.
b. Select the mode on the system unit operator panel the customer was using
when the power-on failure occurred.
c. Attempt to power on the system.
Does the system power on?
No Go to step 14 of this procedure.
Yes Go to step 11 of this procedure.
11. Exchange system unit operator panel card (see “System Rack Removal and
Replacement Procedures” on page 493). Go to ″Map 0410: Repair Checkout″ in
the Diagnostic Information for Multiple Bus Systems.
92 Service Guide
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