IBM @Server pSeries 630 6C4, Service Manual

Page: 133 / 651

Step 1521-14
Because the Model 6C4 and Model 6E4 accommodate redundant power supplies, it is not necessary to
power off the system when replacing a power supply.
The power supplies are symmetrical, so replacement starts with the unit closest to the system wall of the
system drawer (power supply 1). For instructions on replacing a power supply, refer to “Power Supplies”
on page 501.
Notes:
1. Always service first the power supply whose green LED, located on the front of the power supplies, is
out.
2. Before removing a power supply, be sure the redundant power supply is operational by observing the
green LED. The green LED must be on solid.
Replace the following FRUs in order:
1. Power supply #1 (primary)
2. Power supply #2 (redundant)
Perform error log analysis.
Do you receive an SRN indicating a voltage sensor out of range?
NO
The last FRU exchanged is defective. Go to
″
MAP 0410: Repair Checkout
″
in the RS/6000
Eserver
pSeries Diagnostic Information for Multiple Bus Systems .
YES Reinstall the original FRU.
Repeat the FRU replacement steps until a defective FRU is identified or all the FRUs have been
exchanged.
If the symptom did not change and all FRUs have been exchanged, go to “Step 1521-15”.
If the symptom changed, check for loose cards, cables, and obvious problems. If you do not find a
problem, go to the “Quick Entry MAP” on page 63 and follow the instructions for the new symptom.
Step 1521-15
The problem is within the system unit hardware or with the line voltage or wiring.
Shut down the system and remove the power cable from the system unit. Exchange the following FRUs in
the order listed.
1. PCI riser card
2. CEC backplane
Restart the system and perform error log analysis.
Do you get an SRN indicating a voltage sensor is out of range?
NO
The last FRU exchanged is defective. Go to
″
MAP 0410: Repair Checkout
″
in the RS/6000
Eserver
pSeries Diagnostic Information for Multiple Bus Systems .
YES Reinstall the original FRU.
Repeat the FRU replacement steps until a defective FRU is identified or all the FRUs have been
exchanged.
If the symptom did not change and all FRUs have been exchanged, go to “Step 1521-13” on
page 112.
If the symptom changed, check for loose cards, cables, and obvious problems. If you do not find a
problem, go to the “Quick Entry MAP” on page 63 and follow the instructions for the new symptom.
Chapter 3. Maintenance Analysis Procedures (MAPs)
113