6 Alignmenmts and Adjustments
6-8 Convergence Adjustments
Misconvergence occurs when one or more of the
electron beams in a multi beam CRT fail to meet
the other beams at a specified-point.
Table 6-7. Misconvergence Tolerances
Position
Error in mm CRT Dot Pitch
Remark
Center (A)
0.30
0.26
Edge
0.30
0.26
resolution
0.40
0.26
800x600 resolution
306
mm
Figure 6-9 Convergence Measurement Areas
6-8-l Static (Center) Convergence
Static convergence involves the alignment of the
red, blue and green lines in the center area of the
display.
See Dynamic Convergence” for alignment the
color fields around the edges of the display.
Conditions
Direction
Monitor facing east
Warm-up
30 minutes
Display image: Crosshatch pattern
Tolerances
: See Table 6-7
As shown in Figures 6-10, CRTs used in these
monitors all have the same magnet configuration
as shown in Table 6-8 below.
Table 6-8. Magnet Configurations
Magnet Order from Front of CRT
Convergence bow, two-pole,
four-pole, six-pole
Use the following steps to correct any static
misconvergence:
1. Locate the pair of four-pole magnet rings.
2. Unlock the rings and rotate the individual
rings (change the spacing between tabs) to
converge the vertical red and blue lines.
3.
4.
5.
6.
7.
Rotate the pair of rings (maintaining the
spacing between tabs) to converge the
horizontal red and blue lines.
After completing the red and blue center
convergence adjustment, locate the pair of
pole magnet rings.
Rotate the individual rings (change the
spacing between tabs) to converge the vertical
red and blue (magenta) and green lines.
Rotate the pair of rings (maintaining the
spacing between tabs) to converge the
horizontal red and blue (magenta) and green
lines. Don’t rotate the 2-pole magnets, as they
adjust for color purity.
Mark the correct position for the magnets and
apply a small line of glue to hold the magnets
in place. Lock the rings in place.
6-8-Z Dynamic (Edge) Convergence
Use the following procedure to correct minor
dynamic (edge) misconvergence. If, after using
this procedure, dynamic, misconvergence is still
greater than the tolerance around the periphery of
the display area, contact the Regional Service
Center for possible CRT replacement.
Make sure the display is not affected by
external magnetic fields.
Make sure the static convergence is properly
adjusted.
Strategically place small magnetic strips
on the back of the CRT to correct the
misconvergence. Be careful not to remove the
paper protecting the adhesive on the magnetic
strip until you are satisfied with their
placement and the dynamic convergence.
When you are satisfied with the convergence
around the edge of the CRT, permanently glue
the magnets to the back of the CRT.
Table 6-9. Magnetic Strips
Warning
Do not remove or change the position of
the factory installed wedges. These
wedges were installed by the CRT
and are properly placed
for this CRT. Removal may result in
damage to the CRT.
SC-726GXL
6-9
Summary of Contents for SC-726GXL
Page 9: ...2 Reference Information 2 2 Semiconductor Lead Identification 2 4 SC 726GXL ...
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