IBM H Series Installation And Service Manual page 63

YES Go to "Map 0410: Repair Checkout" in the Diagnostic Information for Mul-
tiple Bus Systems.
Step 1520-10
Does the system contain two power supplies?
NO Go to "Step 1520-11."
YES Go to "Step 1520-13" on page 2-30.
Step 1520-11
Shut the system down, turn off the system, and remove the power cable(s) from the
power supply.
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 (Model H50)
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 1520-12" on page 2-30.
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 2-38
and follow the instructions for the new symptom.
Chapter 2. Maintenance Analysis Procedures
2-29