IBM 5531 Operator's Manual page 170

Test 9000 - IBM Industrial Color Display
(continued)
32. Turn the right (vertical-size 2) control until the screen is adjusted to your satisfaction.
33. Were you able to make the adjustment?
YES - Go to Step 29.
NO Have your display serviced.
34. Your IBM 7534 Industrial Color Display is attached to a Color Monitor Adapter
(CGA). High-resolution is not possible in this mode. The right (vertical-size 2) control
does not work.
If you performed Test 9000 because of a problem, return to the step that sent you to this test,
unless you corrected the problem with one of the adjustments.
If you performed a vertical-size adjustment only, this adjustment is completed.
Chapter 5. Problem Determination Procedures
5-9000-9