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2.5 Video Levels and Cutoff Voltages
1.
Select pattern C, black field:
a.
Set RV600, RV631, RV651, and RV671 (cutoff potentiometers) fully
clockwise, as viewed from the video card shield.
b.
Set RV632 and RV652 (gain potentiometers) fully clockwise, as
viewed from the top of the video card.
c.
Set the Brightness control to center detent (midpoint), and the
Contrast control to midpoint.
d.
Adjust G2 so that the screen is just not illuminated.
Brightness control to maximum.
e.
Adjust the cutoff potentiometers for a correct white color point.
f.
Set the Brightness control to center detent (midpoint).
necessary, adjust G2 to ensure that the screen is just not
illuminated.
2.
Select Pattern B, white block.
3.
Ensure that the Contrast control is at midpoint.
4.
Adjust RV652 (green) and RV632 (red) for correct white color points.
5.
Set Contrast to maximum.
6.
Set RV600 to midpoint.
7.
Select pattern E, gray scale blocks.
8.
Check, at maximum and minimum contrast, that the gradation of the
blocks is even from black through white with no color tinges.
9.
Check that there is no color smearing.
If steps 8 and 9 are not satisfactory, repeat this complete procedure.
Note:
The use of a color analyzer is recommended for steps 1e, 4, and 6.
Subtopics
2.5.1 Procedure Using a Color Analyzer
IBM PS/2 8511 and 8518 Color Displays HMS
Video Levels and Cutoff Voltages
¦ Copyright IBM Corp. 1992.
2.5 - 1
Set the
If
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