IBM eserver 630 6C4, Service Manual

Page: 119 / 573

Step 1520-14
Because the Model 6C4 and Model 6E4 accommodate redundant power supplies, it is
not necessary to power down 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 441.
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 1520-15” on page 100.
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 58 and
follow the instructions for the new symptom.
Chapter 3. Maintenance Analysis Procedures (MAPs)
99