IBM 5280 User's Setup Manual page 113

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6. Do the following:
If the display in step 5 appears, go to step 7.
If the display in step 5 does not appear, go to step A 1.
A 1. If the machines do not buzz when you set the Power
switches to the 1 (On) position, check to see if the
following is true:
Power is available at each outlet.
All power cord plugs are plugged into receptacles.
The power switches of all data stations and printers are
set to the 1 (On) position.
Once the checks are completed, go back to step 1 and
.repeat the procedure. If after repeating'steps 1 through
5, the display shown in step 5 does not appear, call your
service representative.
A2. If the machines buzz when you set the Power switches
to the 1 (On) position, check the following:
Is the brightness and contrast control adjusted properly?
Is the keylock turned to the right (clockwise)?
Are the display and diskette drive cables connected
properly? If the expected display appears on a different
data station, or if the display appears upside down or
backward, check your cabling with the setup sheet and
floor plan.
A3. Check the diskette and diskette drive for the following:
Is the verification diskette in diskette drive 4000?
Is the verification diskette inserted properly?
Is the diskette locking lever in the horizontal position?
Once the checks are completed, go back to step 1 and
repeat the procedure. If, after repeating steps 1 through
5, the display shown in step 5 does not appear, call your
service representative.