Table of Contents
Advertisement
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
Attention:
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
c. Power on the system.
Does a power supply reference code occur?
No
Yes
2. Perform the following:
a. Power off the system.
b. Remove one of the blowers from the system rack that was not previously
c. Power on the system.
Does a power supply reference code occur?
No
Yes
3. Have you removed all the blowers one at a time?
No
Yes
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
114
Service Guide
continuing with this procedure.
The ac power must be disconnected from the system rack before removing
enclosure.
Go to step 12 on page 116 of this procedure.
Go to step 2.
removed during this procedure.
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.
Go to step 3.
Go to step 4.
Install all the blowers and continue with step 5.
Go to step 9 on page 115.
Advertisement
Table of Contents
