IBM 6151 Maintenance And Service Manual page 153

Step 21
Look at the upper left corner of the display.
IS "DCP" DISPLAYED THERE?
YES Record SRN 16-64A-F80-AI0; then go to "Step 33" on
page 3-0030-33.
Note: A defective diagnostic diskette can cause this
problem also.
NO
Continue on the next page.
(6/88) Problem Isolation Charts 3-0030-21