TOVIS P/N
MTG-1960XT
DATE
2002.03.11
REV NO.
0
TOVIS
Color Monitor Service Manual
PAGE
19/30
7-3.5. White balance Adjustment. (25% Window Box Pattern)
Pre-adjustment
1) This should be carried out at least 15 minutes.
2) Input the window pattern with 31KHz 640*480 mode.
3) Degauss the screen with Manual degaussing coil.
White Balance adjustment (Back Raster)
1) Remove the video signal
2) Adjust the sub-brightness of back raster to be
0.13FT
(With/Touch)
with SUB BRIGHTNESS volume VR501.
3) And, adjust the color temperature to be X=0.281
±
0.015 and Y=
0.311
±
0.015 by R.G.B bias control function on OSD menu.
4) Adjust BRIGHTNESS to be
0.13FT
(With/Touch).
White Balance adjustment (Video)
1) Input the 25% window pattern with 31KHz 640*480 mode.
2) Adjust the color temperature to be X=0.281
±
0.015 and Y=0.311
±
0.015 by R.G.B gain on OSD menu.
3) Adjust CONTRAST to be
40FT
. (With/Touch)
7-3.6. Purity and Convergence Adjustment.
1) Purity Adjustment.
①
Demagnetize the picture tube and cabinet using a degaussing coil.
②
Turn the CONTRAST and BRIGHTNESS controls to maximum.
③
Adjust RED and BLUE bias controls to provide only a green raster
④
Loosen the clamp screw holding the yoke, and side the yoke,
backward to provide vertical green belt (zone) in the picture screen.
⑤
Remove the Rubber wedges.
⑥
Rotate and spread the tabs of the purity magnet (see figure 1) around
the neck of the picture tube until the green belt is in the center of the
screen. At the same time, center the raster vertically.
⑦
Move the yoke forward slowly until a uniform green screen is obtained.
Tighten the clamp screw of the yoke temporarily.
⑧
Check the purity of the red and blue raster by adjusting the bias
controls.
⑨
Obtain a white raster, referring to "CRT GRAY SCALE ADJUSTMENT
⑩
Proceed with convergence adjustment.
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