Technical information

2.2.2.3.7 Adjustment Procedure Using Color Analyzer
The following instructions are included for those cases when adjustment by
eye is not successful.
1. Insert the Color Displays Test-Pattern Diskette in drive A of system
unit.
CAUTION:
Use extreme 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 RV800 Green cut off, RV801 red cut off, RV802 blue cut off, on
the ITC card ( on the back of the tube ) fully clockwise (CW).
4. Set the Brightness and Contrast control to maximum CCW, as looking
from the top of the display.
5. Select Pattern C (Full Screen Raster) and press the spacebar four
times for a BLACK field/raster.
6. Turn the G2 potentiometer on the EHT transformer slowly CW until the
first color appears. Turn the associated cutoff potentiometer fully
CW.
7. Continue turning the G2 potentiometer CW until the second color
appears. Turn the associated cutoff potentiometer fully CW also.
8. Continue turning the G2 potentiometer CW until the third color
appears.
9. Readjust the first and second cutoff potentiometers and G2 to get the
following white luminance and chromaticity:
(line 1 are CIE COORDINATES)
cd/m 2 x y
2+1.0/-0 .0245+/-).010 0.263+/-0.010
a. Green cutoff potentiometer (RV800) CW predominantly increases y.
b. Red cutoff potentiometer (RV801) CW predominantly increases x.
c. Blue cutoff potentiometer (RV802) CW predominantly decreases both
x and y.
10. Set the Brightness control to center detent (midpoint). Adjust RV700
(GREEN Gain), RV701 (RED Gain), RV702 (BLUE Gain) to the mid position.
11. Select pattern E, Focus pattern. Adjust the Focus (upper pot on the
HVT) for sharp vertical and horizontal lines. Take care not to
disturb the G2 setting.
12. Select pattern C (Full Screen Raster), press Enter three times to
display the WHITE screen raster. Adjust RV700 (GREEN Gain), RV701 (RED
Gain), RV702 (BLUE Gain) only to set the center screen luminance and
chromaticity to:
(line 1 are CIE COORDINATES)
cd/m 2 x y
120 to 150 0.313+/-0.010 0.239+/-0.010
a. Green gain potentiometer (RV700) CW predominantly increases y.
b. Red gain potentiometer (RV701) CW predominantly increases x.
c. Blue gain potentiometer (RV702) CW predominantly decreases both x
and y.
d. CW rotation of all gain potentiometers increases y (brightness).
PS/2 Displays Maintenance Manual
Adjustment Procedure Using Color Analyzer
¦ Copyright IBM Corp. 1993
2.2.2.3.7 - 1