Barco R9002411 Owner's Manual page 26

Random Access Adjustment Mode
WARNING : In order to ensure maximum CRT
longevity and to avoid CRT damage, do not shift
the raster outside the phosphor area of the CRT.
To start the adjustment, use the arrow keys to highlight Raster Shift and press Enter to display the green raster on the CRT.
Press EXIT to return to the Geometry menu.
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Forbidden area
Phosphor border
correct raster position
wrong raster position
Projected raster
CRT faceplate border