Eastern Digital Co V700P, Service Manual

Page: 9 / 51

8
3. White balance and luminance adjustment:
A. Bias (low light) adjustment:
< Ⅰ >
9300
°
K Color temperature
<a> Enter factory Setting menu, and select 9300
°
K Color temperature.
<b> Input Signal F5 (Background Adj. Signal)/mode 1 (640
×
480 Fh: 31.6KHZ)
<c> Image Size: 700model H:300
±
5mm V:225
±
5mm
<d> Set to the center position.
<e> Brightness set to max., Contrast set to max., Adjust FBT Screen VR to make Y=0.6
±
0.2cd/m
2
, adjust
to make x=281
±
10, y=311
±
10.
< Ⅱ >
6500
°
K Color temperature
The adjustment method is similar to <
Ⅰ
>, but x=313
±
10, y=329
±
10.
B. Gain (high light) adjustment.
<
Ⅰ
> 9300
°
K Color temperature.
<a> Enter factory setting menu, and select 9300
°
K color temperature.
<b> Input Signal 7(Display White Screen Signal) / mode 1 (640
×
480 Fh: 31.6KHZ)
<c> Image Size: 700 model H=300
±
5mm V=225
±
5mm
<d> Set VR603/604 to the enter position
<e> Contrast set to max., adjust brightness to make Y=45
±
3cd/m
2
. Select menu, adjust R/B gain to
make x=281
±
10, y=311
±
10.
< Ⅱ >
6500
°
K Color temperature
The adjustment method is similar to <
Ⅰ
>, but x=313
±
10, y=329
±
10.
C. Recheck item A&B to make sure both of them in spec.
D. Full white luminance and block white luminance.
<a> Brightness set to max., contrast set to max., select 9300
°
K color temperature from user menu.
<b> Input signal F9(Display Center Block Signal)/mode 1 (640
×
480 Fh: 31.6KHZ)
<c> Set VR604 to make Y=180
<d> Input signal 7 (Display White Screen Signal)/mode 1 (640
×
480, Fh: 31.6KHZ)
<e> Set VR603 to make Y=85
±
5cd/m
2
.
4. Focus adjustment:
A. Set mode 5 (1024
×
768, Fr: 48.4KHZ) with character full page.
B. Adjust external brightness to raster cutoff and external contrast to max., then adjust focus VR1&VR2 to
make the display be focused very well.
5. Purity adjustment
A. Be sure that the display is not being exposed to any external magnetic fields.
B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is 29
㎜
.(See below diagram)
C. Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to obtain a
complete field of the color red. This is done by moving the two tabs in such a manner that they advance in an
opposite direction but at the same time to obtain the same angle between the two tabs, which should be
approximately 180.
D. Check the complete blue and complete green patterns to observe their respective color purity. make minor
adjustments if needed.
G B R
B R
+20
-10 cd/m
2
R
GB