IBM RS/6000 44P Series 270, Service Manual, Page: 87 / 346

Step 1540-25
One of the FRUs remaining in the system unit is defective.
1. Turn off the power, remove the power cable, and exchange the FRUs in the
following order:
a. System board
b. I/O board (see note 4 on page 27)
2. Plug in the power cable (and wait for OK on the operator panel display).
3. Turn on the power.
Does the system stop with code 4B2xxx00 or 4B2xxx10 displayed on the operator
panel?
NO Go to "MAP 410: Repair Checkout" in the RS/6000 and
Eserver
pSeries
Diagnostics Information for Multiple Bus Systems .
YES Reinstall the original FRU.
Repeat the FRU replacement steps until the defective FRU is identified or all
the FRUs have been exchanged.
If the symptom did not change and all the FRUs have been exchanged, go to
“Step 1540-2” on page 52.
Step 1540-26
The system is working correctly with this configuration. One of the FRUs (adapters) that
you removed is probably defective.
1. Turn off the power and remove the power cable from the power outlet.
2. Install a FRU (adapter) and connect any cables and devices that were attached to
it.
3. Plug in the power cable (and wait for OK on the operator panel display).
4. Turn on the power.
5. If the Console Selection screen displays, choose the system console.
6. Enter the appropriate password if you are prompted to do so.
Does the system stop with code 4B2xxx00 or 4B2xxx10 displayed on the operator
panel?
NO Repeat this step until all of the FRUs (adapters) are installed, then go to "MAP
410: Repair Checkout" in the
RS/6000 and
Eserver
pSeries Diagnostics
Information for Multiple Bus Systems .
YES Go to “Step 1540-27” on page 70.
Chapter 3. Maintenance Analysis Procedures
69