Brightness Control - IBM 5291 1 Operator's Manual

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Brightness Control
Model 1
The brightness of the data on the display is controlled by the Brightness
control on the left underside of the display unit. Turn the control while
watching the display and adjust to the level of brightness you desire.
Model 2
The Brightness control is on the right side of the display unit. Turn the
Brightness knob clockwise to make the data on the display brighter.