IBM 6151 Maintenance And Service Manual page 70

Step 11
Look at the operator panel.
AJZBl58
IS THE TWO-DIGIT DISPLAY BLANK?
NO
Do the following:
1. Find the number displayed in the two-digit display in
the "POST Indicator Chart PIC 0040" on page 3-0040-1.
2. Record the SRN for that POST number. This is the
repair checkDut result.
3. Go to "Step 15" on page 3·0010-16.
YES Continue on the next page.
3-0010-12 Service Manual