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6 Alignments and Adjustments
6-6 Focus Adjustment
1. Display the H character pattern so that the
focus adjustment can be done. (Apply
1280x1024/60 Hz mode to the monitor.)
6-7 CRT Tilt Adjustment
2. Turn the contrast and the brightness controls
fully clockwise.
Reassemble the CRT with fastening screws so that
the dimensions A, B and C, D are separately
equal.
6-8 Purity Adjustment
Note: Color purity adjustments are not available
for monitors using Phillips CRTs.
Use the following procedure to correct minor
color purity problems:
1. Make sure the display is not affected by
external magnetic fields.
2.
Very carefully break the glue seal between the
two-pole purity convergence magnets (PCM)
and the convergence bow magnets (see figure
6-12).
Caution: The convergence bow magnets are
not user or service technician adjustable. Do
not allow these magnets to move.
Also break the seal between the two PCMs.
3.
Make sure the spacing between the PCM
assembly and the CRT stem is 29 mm+1 mm.
4.
Display a red pattern over the entire display
area.
6-9 Convergence Bow Adjustment
Convergence bow adjustments are not available
for any of the CRTs used in the SyncMaster 15GLi
monitors. While the Toshiba CRTs have conver-
gence bow magnets, they are sealed in the CRT
factory and are not user or service technician
adjustable. Do not touch these magnets
(see Figure 6-12). Phillips CRTs do not have
convergence bow magnets, and, therefore, no
convergence bow adjustments are available. If
color purity is out of alignment, replace the CRT.
Bow misconvergence should not exceed the values
listed below:
Front Bezel
Back Raster
Figure 6-3. CRT Tilt Adjustment
5. Adjust the purity magnet rings on the PCM
assembly to display a pure red pattern.
(Optimum setting: X20.620 and Y<0.336)
6. Adjust each corner and the center to meet the
red color tolerances listed below.
7. Repeat steps 4 through 6 using a green pattern
and again, using a blue pattern.
Table 6-2. Color Purity Tolerances
Y¥S0.34+0.02
Y¥S0.59+0.02
YS0.06+0.02
Red:
X20.6240.02
X20.31+0.02
Green:
Blue:
X20.14+0.02
(For 9300°K color adjustment: X=0.283+0.02,
Y=0.298+0.02)
8.
When you have the PCMs properly adjusted,
carefully glue them together to prevent their
movement during shipping.
Table 6-3. Bow Misconvergence Tolerances
CRT Dot Pitch
Center
0.3
0.28
Edge
0.4
0.28
eee:
Figure 6-4. Bow Misconvergence
6-8
Samsung Electronics SyncMaster 15GLi
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