AC Box Problem Isolation
A bulk power supply with a blinking or unlit light (LED) is an indication of a failure.
Note: Read the Danger and Caution notices under “Safety Notices” on page xiii before
continuing with this procedure.
Attention: The ac power must be disconnected from the system rack before removing
or installing regulator assemblies R04, R05, or R06.
1. Perform the following:
a. Power off the system.
b. Disconnect all regulators assemblies by sliding them partially out of the
enclosure.
c. Power on the system.
Does a power supply reference code occur?
No Go to step 12 on page 116 of this procedure.
Yes Go to step 2.
2. Perform the following:
a. Power off the system.
b. Remove one of the blowers from the system rack that was not previously
removed during this procedure.
c. Power on the system.
Does a power supply reference code occur?
No The blower you removed in this step is failing, replace the failing blower.
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
Yes Go to step 3.
3. Have you removed all the blowers one at a time?
No Go to step 4.
Yes Install all the blowers and continue with step 5.
4. Perform the following:
a. Power off the system.
b. Install the blower that was removed in step 2 in the original location.
c. Go to step 2.
5. Perform the following:
a. Power off the system.
b. Remove all except one of the bulk power supplies from the system.
c. Power on the system.
Does a power supply reference code occur?
No Go to step 9 on page 115.
114 Service Guide
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