IBM 6151 Maintenance And Service Manual page 152

Step 20
Be sure the RT PC Diagnostics 1 diskette is correctly inserted in
the diskette drive.
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DID YOU FIND A PROBLEM?
YES Go to "Step 2" on page 3-0030-2.
NO Record SRN 16-64A-F80-AI0; then go to "Step 33" on
page 3-0030-33.
3-0030-20
Service Manual