IBM RS/6000 H50, Installation And Service Manual

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Step 1520-8
Does the system contain two power supplies?
NO Go to “Step 1520-9.”
YES Go to “Step 1520-11” on page 2-18.
Step 1520-9
Shut the system down, turn off the system, and remove the power cable from the
system unit.
Exchange the following FRUs in order. If the I/O board is to be replaced, see notes
on 2-1.
1. Power Supply.
2. Power Cables to I/O Board.
3. I/O Board.
4. Power Distribution Board.
5. Service Processor.
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 410: Repair Checkout"
in the
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 1520-10” on page 2-18.
If the symptom changed, check for loose cards, cables, and obvious prob-
lems. If you do not find a problem, return to “Step 1540-1” on page 2-26
and follow the instructions for the new symptom.
Chapter 2. Maintenance Analysis Procedures
2-17