Rockwell Automation 6157 Industrial 20 inch Monitors - Manual (Page 17)

Industrial 20" CRT Monitor 17
Publication 6157-5.1
Manual Degauss
The monitor is equipped with an automatic degaussing system to remove
residual magnetism from the CRT’s shadow mask at power-up.
Degaussing helps keep the screen free of any color impurities which
might otherwise result from magnetism picked up by the shadow mask
from the earth’s magnetic field when the monitor is moved.
In addition, a degauss push button is provided on the control panel. This
manual control can be used if color impurities appear on the screen while
the monitor is in operation.
Note: The internal degauss will not prevent color impurities
caused by local magnetic fields. Metal enclosures can
easily become magnetized by welding and machinery
operations.
Use a hand held degaussing coil to remove residual
magnetism from the enclosure.
Tip: For best results, perform a manual degauss only after allowing at
least 15 minutes to pass following power-up or a previous manual
degauss.
Brightness and Contrast
The 6157 Industrial Monitor is equipped with adjustable brightness and
contrast controls. These controls are located on the front panel of the
unit.
To obtain the best display, first set the brightness control to the
appropriate setting under the lighting conditions in which the monitor
will be used. Then adjust the contrast control to increase or decrease the
intensity of the video image as required.
To set the brightness and contrast controls:
1. Press the Select Mode button until the status LED indicator below
the Brightness icon is lit.
Note: For best results, display a screen image with a large
black area before setting these controls.
2. Use the left arrow button to adjust the brightness value to its lowest
setting.
3. Use the right arrow button to adjust the brightness until the black
colors in the screen image change from black to dark gray.