SAMSUNG 753DFX
Manual de Servicio

4 Alignment and Adjustments

CONFIDENTIAL
Run the All Mode save in the Right Menu. Caution : Do not Run the All mode Save at the other scannig times except for 1024x768 (68kHz/85Hz). 4-2-3 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Crosshatch pattern Maximum Maximum

4-2 Display Control Adjustments
4-2-1 HIGH VOLTAGE
Signal: 1024 x 768 (68 kHz/85 Hz) Display image: Don�t care Contrast: Minimum Brightness: Minimum Limit: 26.0 kV ± 0.3 kV Measure the high voltage level at the anode cap. High voltage should be within the limit as above.

4-2-2 CENTER RASTER
Adjust SW401 so that the back raster comes to the center when you apply basic mode for 17�.

4-2-3 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: 312 mm (H) x 234 mm (V). Adjust the horizontal position and vertical position to � 5.0 mm of the center point of the screen. |A-B| � 5.0 mm.
C

Use control bar after selecting �V-SIZE� in left menu to adjust the vertical size of the display pattern to 234 mm.(Tolerance: ± 4 mm.) 4-2-3 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: Display image:

68 kHz/85 Hz Crosshatch pattern

Use control bar after selecting �H-POSITION� in left menu to center the horizontal image on the raster. 4-2-3 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: Display image: 68 kHz/85 Hz Crosshatch pattern

|C-D| � 5.0 mm.
DISPLAY AREA

A

B EDGE OF BEZEL D

Use control bar after selecting �V-POSITION� in left menu to center the vertical image on the raster.

Figure 4-3. Centering * In Softjig window, �Geometry� has to be selected for GD adjustment. 4-2-3 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Crosshatch pattern Maximum Maximum

4-2-4 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 Tables 4-2 and 4-3, an image appears distorted, elongated or squashed. Table 4-1. Standard Modes Linearity: 1024x768/85Hz
Standard Modes Linearity Difference between Each block (8 %) adjacent blocks (4 %) 4:3 Horizontal: 20.9~23.1 Horizontal: Less than 0.88 mm Vertical : 20.9~23.1 Vertical : Less than 0.88 mm

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 312mm(Tolerance : ±4mm.)

4-2

AN17K*/AN17L*