IBM 6151 Maintenance And Service Manual page 134

Step 2
1.
Set the power switch On the system unit to Off.
2. If present, remove the write-protect tab from the diagnostics
diskettes. Insert the RT PC Diagnostics 1 diskette in the
diskette drive and close the drive.
Note: You may be instructed to insert another diagnostic
diskette. If so, change to the diagnostic diskette called for and
continue.
3.
Set the keylock to Unlock.
4. If attached, be sure the power switch on the RT PC
6192
is set
to On.
5. If an IBM
6156
is attached, install any portable disk drive
modules you want to test; then set the power switch on the IBM
6156 to On.
6. Set the power switch on the system unit and display to On; then
wait 4 minutes or until the DIAGNOSTIC OPERATING
INSTRUCTIONS menu displays.
IS THE TWO-DIGIT DISPLAY BLANK?
NO Go to "Step 11" on page
3-0030-11.
YES Continue on the next page.
3-0030-2 Service Manual