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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:
Manimum
Brightness:
Manimum
Limit:
26.0 kV ± 0.5 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 VOL"
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 SCREEN VOLTAGE CHECK
CONDITIONS
Signal:
1024 x 768 (68 kHz/85 Hz)
Display image: Don't care
Contrast:
Manimum
Brightness:
Manimum
Limit:
520 V ± 10 V
Measure the Screen voltage (G2 voltage) at the pin
(CN501) on the Main PCB.
PROCEDURE
1. Connect the high voltage probe to the CN501.
(Main PCB)
2. Using the jig, adjust the G2 voltage to the
specification.
* G2 Voltage (Screen voltage) Adjustment PROCEDURE
using Softjig
Select matching model name in "Model" field.
Select " @7: Zero Beam" in menu after
selecting "Extra 1"
Adjust G2 using control bar after selecting "G2
CONT"
PN17K*/PN17J*
4-2-3 CENTER RASTER
Adjust SW401 so that the back raster comes to the
center when you apply each basic mode.
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.
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
4-2-4 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
68 kHz/85 Hz
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 312 mm with OSD "H-SIZE" fixed "39".
(Tolerance: ± 4 mm.)
Specially run "All mode save" after horizontal
size adjustment in order to save "SIZE B+" values
of other modes automatically.
4-2-4 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
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 234 mm. (Tolerance: ± 3 mm.)
4 Alignment and Adjustments
|C-D| ≤ 4.0 mm
DISPLAY AREA
B
EDGE OF BEZEL
4-3
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