IBM pSeries 670 Service Manual page 219

Step 152f-49
Have all the modules listed in "Step 152f-42" on page 198 been reinstalled?
Yes The symptom has changed. This ends the procedure.
Return the system to its original configuration.
Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver pSeries Diagnostic Information
for Multiple Bus Systems.
No Go to "Step 152f-45" on page 198.
Step 152f-50
Examine the amber logic-power LEDs of all installed processor subsystem DCAs.
Step 152f-51
Are all amber logic-power LEDs of all installed processor subsystem DCAs off?
Yes Go to "Step 152f-52".
No Call for support.
Step 152f-52
Attention: Before replacing the system backplane, call for support.
Replace the system backplane, at location U1.18-P1.
Step 152f-53
Turn on the power.
Step 152f-54
Did the system stop with the same error code as recorded in "Step 152f-1" on page 193?
Yes Go to "Step 152f-55".
No The system backplane was defective. This ends the procedure.
Return the system to its original configuration.
Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver pSeries Diagnostic Information
for Multiple Bus Systems.
Step 152f-55
Turn off the power.
Make sure all amber logic-power LEDs of all installed processor subsystem DCAs are off.
Step 152f-56
Has the system backplane been replaced?
Yes Call for support.
No Go to "Step 152f-52".
Chapter 3. Maintenance Analysis Procedures
199