IBM pSeries 690 Service Manual page 303

Step 152k-58
Turn off the power.
Make sure all the green "power good out" LEDs of both I/O subsystem DCAs are off.
Step 152k-59
Remove the new card that was just installed in "Step 152k-55" on page 282 and reinstall the original card.
Step 152k-60
Have all the cards listed in "Step 152k-55" on page 282 been replaced with new or original cards?
Yes Go to "Step 152k-61".
No Go to "Step 152k-55" on page 282.
Step 152k-61
Examine the the green "power good out" LEDs of both I/O subsystem DCAs.
Step 152k-62
Are all the green "power good out" LEDs of both I/O subsystem DCAs off?
Yes Go to "Step 152k-63".
No Call for support.
Step 152k-63
Replace the parts in the following list one at a time and in the order listed:
v I/O subsystem backplane at P1
v I/O subsystem backplane at P2
Step 152k-64
Turn on the power.
Step 152k-65
Did the system stop with the same error code as recorded in "Step 152k-1" on page 275?
Yes Go to "Step 152k-66".
No The card just replaced 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 152k-66
Turn off the power.
Make sure all the green "power good out" LEDs of both I/O subsystem DCAs are off.
Step 152k-67
Have all the cards listed in "Step 152k-63" been replaced?
Yes Call for support.
No Go to "Step 152k-63".
Chapter 3. Maintenance Analysis Procedures
283