Samsung PN15VT / VO Service Manual page 12

4-2 Display Control Adjustments
4-2-1 HIGH VOLTAGE ADJUSTMENT (Only HT/HO)
Signal: 800 x 600 (54 kHz/85 Hz)
Display image: Full White Pattern
Contrast: Maximum
Brightness: Maximum
Limit: 25.0 kV ± 0.2 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
Select matching model name in "Model" field.
Select " @7: Zero Beam" in menu after
selecting "Extra 1"
Adjust high voltage using control bar after
selecting "HV MIN"
Turn the power off/on after adjustment
finished.
Check the high voltage has been fixed with
adjusted value after reselecting "@7: Zero Beam".
4-2-2 CENTER RASTER
Adjust VR401 so that the back raster comes to the
center when you apply each basic mode.
PN15VT/VO
PN15HT/HO
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: 267 mm (H) x 200 mm.
Adjust the horizontal position and vertical
position to ≤ 4.0 mm of the center point of the
screen.
|A – B| ≤ 4.0 mm.
C
A
D
Figure 4-3. Centering
4-2-3 (a-1) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz (VT/VO)
68 kHz/85 Hz (HT/HO)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Use control bar after selecting "SIZE B+" in left
menu to adjust the horizontal size of the display
pattern to 255 mm . (Tolerance: ± 1 mm.)
4-2-3 (a-2) HORIZONTAL SIZE ADJUSTMENT
Use control bar after selecting "H-SIZE" in left
menu to adjust the horizontal size of the display
pattern to 267 mm . (Tolerance: ± 3 mm.)
4-2-3 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 54 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: ± 3 mm.)
4 Alignment and Adjustments
|C – D| ≤ 4.0 mm.
DISPLAY AREA
B
EDGE OF BEZEL
4-3