IBM 3270 Operator's Manual page 24

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Brightness Control
You can adjust the brightness of the characters displayed on the screen by turn-
ing the brightness control
U
knob to the left or to the right. Turning it
to the right makes the display image brighter; to the left, dimmer. Experiment
with this control until you find the setting that is most convenient and comfort-
able for your viewing.
This control also has a test position. When the control knob is turned fully clock-
wise beyond the first stop and held, the screen becomes very bright.
() Contrast Control
The contrast control ()
is another aid in adjusting your display for comfort-
able viewing. If your organization uses two intensity levels to display characters
(explained later in this chapter under the heading "High Intensity Data"), the
contrast control varies the difference between these two levels. You may have to
experiment with this control until you find the contrast level that satisfies you.
i l
Audible Alarm Volume Control
If your display station has the Audible Alarm feature (described in Chapter 4)
installed, the volume control
R
for the audible alarm is located at the
outside of and behind the screen contrast control. Turning this control clockwise
will increase the sound level; turning the control counterclockwise will decrease
the sound level. If you want to test or adjust the audible alarm, refer to the
Audible Alarm feature description in Chapter 4.
Chapter 2 Controls and Indicators 2-9