IBM 6151 Maintenance And Service Manual page 390

Step 6
1. Exchange the processor board in slot A.
2. Be sure the power has been off 30 seconds; then set the power
switch on the system unit to On.
3. Wait 2 minutes; then answer the following question.
AJZBl65
IS "5c" OR "05" DISPLAYED IN THE TWO-DIGIT DISPLAY?
NO
Set the power switch on the system unit to Off; then go to
"Step 8" on page 3-9810-8.
YES Set the power switch on the system unit to Off.
1.
Remove the processor board from slot A.
2. Exchange the system board.
3. Go to "Step 8" on page 3-9810-8.
3-9810-6 Service Manual