Technical information

2.3.2.3.5 Color Adjustments
Proceed as follows.
1. Select pattern C, and depress the spacebar four times until the black
field is selected.
2. Set RV202, RV232, and RV262 (Cutoff Potentiometers) fully CCW, as
viewed from the top of the video card.
3. Set RV201, RV231, and RV261 (Gain Potentiometers) fully CW, as viewed
from the rear of the video card.
4. Set the background and foreground brightness controls to the midpoint
position.
Note: The midpoint can be found by turning the controls fully CW as
viewed from the top of the display. Then turning the control the
length of the window two times.
5. Adjust G2 so that the screen is just illuminated. Set both brightness
controls to maximum.
6. Adjust the cutoff potentiometers for the correct white color point.
7. Set both brightness controls to the center midpoint. If necessary,
adjust G2 to ensure that the screen is just not illuminated.
8. Select Pattern B, 50 mm Square Box and depress the spacebar three
times until a white square appears.
9. Ensure that both brightness controls are at the midpoint.
10. Adjust RV201 (blue), RV231 (red), and RV261 (green) gain
potentiometers on the rear of the video card for the correct white
color point.
11. Some video cards may contain RV280. If this potentiometer is present
is should be adjusted fully CCW.
12. Select Pattern D, Gray Scale Blocks and adjust G2 so the top right
hand block is visible and the block to the left of it is just visible.
13. Check, at maximum and minimum foreground and background brightness
that the blocks are evenly graduated black through white with no color
tinges.
14. Check that there is no color smearing.
PS/2 Displays Maintenance Manual
Color Adjustments
¦ Copyright IBM Corp. 1993
2.3.2.3.5 - 1