IBM Personal Computer

3 Set the Power switch on the system unit (and
expansion unit, if attached) to Off.
4 Turn the Brightness and Contrast controls fully
clockwise.
Contrast
Control
5
Turn the Vertical Size control fully
counterclockwise. A black area should appear
across the top and bottom
of the screen.
, ---===--
o
Vertical Size
Control
9000-2 Test April 1984