IBM 6C1, Service Manual

Page: 79 / 377

Step 1520-14
Because the
Eserver
pSeries 610 Model 6C1 and Model 6E1 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 power supply 1 (the
unit closest to the bottom in a Model 6C1 or to the top left in a Model 6E1). Refer to
“Power Supply” on page 282 for instructions on replacing a power supply.
Notes:
1. Always service first the power supply whose green LED, located on top of the
power supplies, is either blinking or 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 steady and not blinking or
out.
Replace the following FRUs in order:
1. Power supply 1
2. Power supply 2
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 1520-13” on page 60.
If the symptom has changed, check for loose cards, cables, and obvious
problems. If you do not find a problem, return to “Step 1520-1” on page 54 in
this MAP and follow the instructions for the new symptom.
Chapter 3. Maintenance Analysis Procedures (MAPs)
61