HP 9020 CE Handbook page 66

9020 Adjustments
6-7
Converging the 9020C Display
l. Run the System Functional Tests using the MAINFRAME TEST PROGRAMS disc. Select the
test for color graphics (CGRAPHICS) then select the CONVERGE option.
2. Open the door located just to the right of the screen (on the display case) to expose 39
alignment locations and the alignment tool; the 39 alignment locations are organized in
rows by adjustment number (13 in all) and in columns by color (red, blue, and green).
Remove the alignment tool from inside the door by pressing its top.
3. A small white plus sign (
+ )
is displayed in one area. Additionally, the number 1 appears
along the right hand edge of the display to remind you of the row of alignment locations
you should use to adjust the convergence. Use the alignment tool to merge
(if
necessary)
the red, blue, and green pluses by turning the appropriate control for the color you are
moving. For example, adjusting the alignment location in row one, column one (the red
column), moves the red plus.
Adjusting the alignment locations causes the pluses to move across the screen according
to the following rules:
a. the red plus moves along a line from lower left to upper right.
b. the blue plus moves along a vertical line.
c. the green plus moves along a line from upper left to lower right.
You may find that the easiest way to merge the pluses is to first merge the red and green
pluses together (forming a yellow plus). Next merge the blue plus (which now lies directly
above or below the yellow plus) into the yellow plus, forming a white plus.
Note
If the character displayed is a white plus with shaded (colored) edges
rather than completely separated pluses, very little adjustment is
needed. Even when the three colored pluses are correctly merged, a
small amount of colored "fringing" may appear around the edges.
This is normal.
4. After you are satisfied with the adjustment for alignment location one, press
~.
Another white plus appears; this is for alignment location 2. Adjust locations 2 through 13
in the same manner as indicated in step 3 above.
5. If you are not satisfied that all pluses are properly merged, steps 3 through 4 may be
repeated as many times as necessary. When you are completely satisfied that the display
is converged, press
~
to exit the routine.
09020-90035.
rev:
Jl85