Samsung HCH551WX Service Manual page 16

STATIC FOCUS (CONTINUED)
Vary the focus pack VR (Red, Blue) on the
front cabinet. Adjust the TV for best possible
focus around the center of the crosshatch
pattern, without losing overall screen balance.
Figure Crosshatch Pattern
Examine these points together.
Examine these points together
Fig. 3-1 Crosshatch Pattern.
3-4-8 Lens Focus Adjustment
PRECAUTIONS
1. Do this adjustment after the static focus
adjustment and the tilt adjustment.
2. Select the ÒSTANDARDÓ video mode.
(Contrast:64, Brightness:32)
3. Input a crosshatch pattern.
ADJUSTMENT
1. Loosen the lens screws.
2. Cover the two lenses that are not being
adjusted.
3. Adjust the lens, observing the color aberration
vertically and horizontally within 3 blocks of
the center of the crosshatch pattern.
4. When the lens is turned clockwise, the color
aberration will change as follows:
Lens Color Aberration Change
R Orange - Crimson
G Blue - Red
B Purple - Green
Samsung Electronics
5. Green lens adjustment:
Set the lens at the point where Blue just
changes to Red. If the color aberration is
irregular throughout the picture screen, adjust
the lens to show Red color aberration
(approximately 1~3 mm area) within a 3-block
grid around the horizontal center-line. If the
color aberration is irregular, adjust the lens as
shown in the diagram below. (Accurate
alignment of Green is important for overall
color quality.)
6. Red lens adjustment
Set the Red lens at the point where Orange
becomes Crimson.
7. Blue lens adjustment
Set the Blue lens at the point where Purple
becomes Green.
L1
RED ABERRATION BLUE ABERRATION
Fig. 3-2 Color Aberration
3-4-9 Horizontal Dynamic Focus Adjustment
PRECAUTION
1. Input a crosshatch pattern.
2. Select the ÒSTANDARDÓ video mode.
3. Warm up the set for at least 10 minutes.
ADJUSTMENT
1. Cover the Red and Blue lenses.
2. Adjust VR49 (located on the deflection PCB,
H-Parabola).
3. Balance the left and right sides of the dynamic
focus lines.
Alignment and Adjustments
P
L2
L1, L2 < P
_
3-9