IBM pSeries 690 Service Manual page 236

Step 152b-35
Turn on the power.
Step 152b-36
Did the system stop with the same error code as recorded in "Step 152b-1" on page 212?
Yes Go to "Step 152b-37".
No The book just replaced is 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 152b-37
Turn off the power.
Make sure all amber logic-power LEDs of all installed processor subsystem DCAs are off.
Step 152b-38
Remove the new book that was just installed in "Step 152b-34" on page 215 and reinstall the original book.
Step 152b-39
Have all the books listed in "Step 152b-34" on page 215 been replaced with new or original books?
Yes Go to "Step 152b-40".
No Go to "Step 152b-34" on page 215.
Step 152b-40
Examine the amber logic-power LEDs of all installed processor subsystem DCAs.
Step 152b-41
Are all amber logic-power LEDs of all installed processor subsystem DCAs off?
Yes Go to "Step 152b-42".
No Call for support.
Step 152b-42
Attention: Before replacing the system backplane, call for support.
Replace the system backplane at location U1.18-P1.
216 Eserver pSeries 690 Service Guide