TOVIS P/N
MTG-1972XN
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 for 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
0.85FT
±
0.15FT
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
0.85FT
±
0.15 FT
.
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
60FT
±
5 FT.
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 slowly forward until a uniform green screen is obtained.
Tighten the clamp screw of the yoke temporarily.
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