Samsung AQ17KS Service Manual page 15

4-2 Display Control Adjustments
4-2-1 HIGH VOLTAGE ADJUSTMENT
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 hight voltage level at the anode cap.
High voltage should be within the limit as above.
If the high voltage needs adjustment use the
following procedure.
PROCEDURE
1. Turn the power off and disconnect the AC line
cord from the power source.
2. Turn the power on after connecting high
voltage Probe.
3. Using the jig, adjust the high voltage to the
specification.
* High Voltage Adjustment PROCEDURE using Softjig
x Select matching model name in "Model" field.
➁ Select " @7: Zero Beam" in menu after
selecting "Extra 1"
➂ Adjust high voltage using control bar after
selecting "HV MIN"
➃ Turn the power off/on after adjustment
finished.
➄ Check the high voltage has been fixed with
adjusted value after reselecting "@7: Zero Beam".
4-2-2 SCREEN VOLTAGE ADJUSTMENT
CONDITIONS
Signal: 1024 x 768 (68 kHz/85 Hz)
Display image: Don't care
Contrast: Minimum
Brightness: Minimum
Limit: 500 V ± 10 V
Screen Voltage adjustment procedure using softjig
is all the same as 4-2-1 but selecting "G2 CONT"
on the contrary to "HV MIN".
4-2-3 CENTER RASTER
Adjust SW401 so that the back raster comes to the
center when you apply basic mode for 17".
AQ17KS
4-2-4 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 ≤ 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
* In Softjig window, "Geometry" has to be
selected for GD adjustment.
4-2-4 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
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 : ±3mm.)
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).
4-2-4 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
4 Alignment and Adjustments
DISPLAY AREA
B
EDGE OF BEZEL
68 kHz/85 Hz
Crosshatch pattern
Maximum
Maximum
68 kHz/85 Hz
Crosshatch pattern
Maximum
Maximum
4-3