Technical information
2.2.2.3.5 Color Point Adjustments
Proceed as follows.
1. Insert the Color Displays Test-Pattern Diskette in drive A of system
unit.
CAUTION:
Use caution when making adjustments with the cover removed. There are
high voltages on the Yoke, analog and video cards.
2. Power on the system unit and the 8513 Display. The system unit runs
internal checks, and then loads the program from the diskette.
3. Turn all color pots RV700, RV800, RV701, RV801, RV702, and RV802 on
the ITC card (on the back of the tube) full CCW.
4. With the Brightness control set to center detent (midpoint) and
Contrast control to midpoint: Adjust G2 (intensity pot), lower pot on
HVT, until the MSG. and A: prompt are visible. Adjust FOCUS, upper pot
on HVT for clarity. Type "VGA" at the A: prompt and press Enter.
Press Enter 720 x 350 screen. Select pattern C (Full Screen Raster),
then press Enter four times for a BLACK field. Turn G2 CCW until the
screen just goes blank.
5. Allow 20 minutes for the display to warm up before making any further
adjustments.
6. Set the Brightness and Contrast control to maximum CCW, looking from
the top of the display.
7. Adjust the cutoff potentiometers RV800 (Green Cut-Off), RV801 (Red
Cut-Off), RV802 (Blue Cut-Off), for a correct white color point.
Note: Adjust the predominant color on the screen last if needed.
8. Set the Brightness control to center detent (midpoint). If screen is
illuminated, adjust G2 to ensure the screen is just not illuminated.
9. Depress F3, select pattern A (Crosshatch) on the setup diskette. This
will display the GREEN crosshatch.
10. Set the Brightness and Contrast controls (minimum) fully CW, as viewed
from the top of the display. Then Adjust RV700 (GREEN Gain) CW until
the crosshatch illuminates GREEN then CCW until the vertical lines
just go blank.
11. Depress the Enter key once to display the BLUE crosshatch. Then adjust
RV702 (BLUE Gain) CW until the crosshatch illuminates BLUE, then CCW
until the vertical lines just go blank.
12. Depress the Enter key once to display the RED crosshatch. Then adjust
RV701 (RED Gain) CW until the crosshatch illuminates RED then CCW
until the vertical lines just go blank.
13. Set the Brightness control to center detent (midpoint) and Contrast
control to midpoint.
14. Depress F3, select pattern C (Full Screen Raster), press Enter three
(3) times to display the WHITE screen raster.
15. Adjust if necessary RV700 (Green Gain), RV701 (Red Gain), RV702 (Blue
Gain), for correct white color point.
Note: Adjust the predominant color on the screen last if needed.
16. Depress F3, select pattern D (Gray Scale).
17. Check, at maximum and minimum Contrast, that the blocks are evenly
graduated from black through white with no color tinges.
18. Check that there is no color smearing.
If steps 17 and 18 are not satisfactory, repeat this complete procedure.
PS/2 Displays Maintenance Manual
Color Point Adjustments
¦ Copyright IBM Corp. 1993
2.2.2.3.5 - 1