IBM 6151 Maintenance And Service Manual page 391

Step 7
One of the boards removed from slots B or D is failing.
1.
Set the power switch on the system unit to Off.
2. Install one of the boards removed from slots B or D.
3. Be sure the power has been off 30 seconds; then set the power
switch on the system unit to On.
4. Wait 2 minutes; then answer the following question.
AJZBjfi:i
IS "5c" OR "05" DISPLAYED IN THE TWO-DIGIT DISPLAY?
NO Repeat this procedure.
YES Set the power switch on the system unit to Off.
1.
The last board installed is failing, exchange the failing
board.
2. Go to "Step 8" on page 3-9810-8.
(6/88) Problem Isolation Charts 3-9810-7