IBM 5155 - Page 178

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