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4-18 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
ColorBar
Description The primary version has 16 full-height vertical color
bars. The order of the bars is shown below. The
secondary version splits the field into a top and
bottom half. The bars in the bottom half of the
screen are in reverse order.
When digital video is being output, 33% Gray
changes to 50% Gray and 67% Gray becomes either
Black or some gray level depending on how the
display interprets the video information.
Test Verify that all video channels is functional
Purpose To verify that none of the video channels are bad
or hooked up incorrectly
Method Compare the sequence of color bars with the table.
Missing bars may indicate a dead or unconnected
channel. The transition between the bars should
be sharp and distinct. Each bar also should be
uniform in color and intensity across its entire
width. Non-uniformity may indicate problems with
the response of the video amplifiers. If all the bars
are present but in the wrong order, one or more
inputs may be swapped.
Black
50% Blue
50% Green
50% Cyan
50% Red
50% Magenta
50% Yellow
67% Gray
33% Gray
Blue
Green
Cyan
Red
Magenta
Yellow
White