Samsung LB15VS Service Manual page 14

4 Alignment and Adjustments
4-2 Display Control Adjustments
4-2-1 HIGH VOLTAGE
Signal: 800 x 600 (15" 54 kHz/85 Hz)
1024 x 768 (17" 68 kHz/85 Hz)
Display image: Don't care
Contrast: Minimum
Brightness: Minimum
Limit: 25.0 kV ± 0.3 kV (15")
26.0 kV ± 0.3 kV (17")
Measure the high voltage level at the anode cap. High
voltage should be within the limit as above.
4-2-2 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: 267 mm (H) x 200 mm (V) : (15")
312 mm (H) x 234 mm (V) : (17").
Adjust the horizontal position and vertical position to ≤
5.0 mm of the center point of the screen.
|A-B| ≤ 5.0 mm. |C-D| ≤ 5.0 mm.
C
A
D
Figure 4-1. Centering
* In Softjig window, "Geometry" has to be
selected for GD adjustment.
4-2-3 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz (15")
68 kHz/85 Hz (17")
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Click Standard Dump on the right Menu in the general
field.
Use control bar after selecting size B+ in the left Menu
to adjust the horizontal size of the display, Pattern to
267mm(Tolerance : ±4mm.)(15")
Pattern to 312mm(Tolerance : ±4mm.)(17")
Run the All Mode save in the Right Menu.
4-2
DISPLAY AREA
B
EDGE OF BEZEL
Caution : Do not Run the All mode Save at the other
scannig times except for 800 x 600 (54 kHz/85 Hz) -> 15"
1024x768 (68kHz/85Hz) -> 17".
4-2-2 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz
68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Use control bar after selecting "V-SIZE" in left menu
to adjust the vertical size of the display pattern to 200
mm.(Tolerance: ± 4 mm.) : 15", 234 mm.(Tolerance: ±
4 mm.) : 17"
4-2-2 (c) HORIZONTAL POSITION
ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz : 15"
68 kHz/85 Hz : 17"
Display image: Crosshatch pattern
Use control bar after selecting "H-POSITION" in left
menu to center the horizontal image on the raster.
4-2-2 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz : 15"
68 kHz/85 Hz : 17"
Display image: Crosshatch pattern
Use control bar after selecting "V-POSITION" in left
menu to center the vertical image on the raster.
LB15VS/LB17LS/LB17KS/
LB17LT/LB17KT