Samsung CF21G Series Service Manual page 9

4 Alignment and Adjustments
4-2 Display Control Adjustments
4-2-1 Centering
Centering means to position the center point of
the display in the middle of the display area.
Horizontal size and position and vertical size and
position control the centering of the display.
Adjust the horizontal size and vertical size to their
optimal settings: 393 mm (H) x 295 mm (V).
1280 x 1024 mode (91 kHz/85Hz)
Adjust the horizontal position and vertical
position to ≤ 4.0 mm of the center point of the
screen.
|A-B| ≤ 4.0 mm. |C-D| ≤ 4.0 mm.
C
A
D
Figure 4-3. Centering
4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to SIZE B+ to
adjust the horizontal size of the display pattern
to 393 mm (Tolerance: ± 3 mm) as the "H_SIZE"
is "60" on the OSD.
4-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to V_SIZE to
adjust the vertical size of the display pattern to
295 mm. (Tolerance: ± 3 mm.)
4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz / 85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to H_POSI to
center the horizontal image on the raster.
4-2
DISPLAY AREA
B
EDGE OF BEZEL
91 kHz / 85 Hz
Crosshatch pattern
Cut-off
Maximum
91 kHz /85 Hz
Crosshatch pattern
Cut-off
Maximum
4-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz / 85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to V_POSI to
center the vertical image on the raster.
4-2-2 Linearity
Linearity affects the symmetry of images as they
appear on the screen. Unless each row or column
of blocks in a crosshatch pattern is of equal size,
or within the tolerances shown in Table 4-1 an
image appears distorted, elongated or squashed.
Horizontal Linearity = 2x
Y max-Y min
Vertical Linearity = 2x
Y max+Y min
Table 4-1
Adjacent Linearity Entire Linearity
Preset mode
Pre-load mode (48kHz~)
Pre-load mode (under 48kHz)
Preset Mode : 91 KHz / 85 Hz
Pre-load Mode : Refer to Timing Chart
4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz / 85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
To adjust the Horizontal Linearity, refer to Table
4-1 for the tolerance range.
Click on the << or >> box next to H_LIN to
optimize the image.
Table 4-2
(Horizontal x Vertical Size Table)
Horizantal
Vertical
CONFIDENTIAL
X max-X min
x100
X max+X min
x100
≤ 4% ≤ 8%
≤ 5% ≤ 10%
≤ 5% ≤ 14%
21"
393
295
CF21G*