TOVIS P/N
MTG-1902EX
DATE
2002.03.11
REV.NO
0
TOVIS
Color Monitor Service Manual
PAGE
14/25
7-3.5. White balance Adjustment
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 a manual degaussing coil.
White Balance adjustment (Back Raster)
1) Remove the video signal
2) Adjust the sub-brightness of back raster to be 0.36
±
0.05FT/L with
R,G,B BIAS
3) And, adjust the color temperature to be X=0.281
±
0.02 and Y=
0.311
±
0.02 by R.G.B bias control function on OSD menu.
4) Adjust BRIGHTNESS to be 0.36FL
±
0.05 F/L.
White Balance adjustment (Video)
1) Input the 20% window pattern with 31KHz 640*480mode.
2) Adjust the color temperature to be X=0.281
±
0.015 and Y=0.311
±
0.02 by R.B gain on OSD menu.
3) Adjust CONTRAST to be 67FL
±
5 F/L.
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 the RED and BLUE bias controls to provide only a green raster
④
Loosen the clamp screw holding the yoke, and slide the yoke
backwards to provide a 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.
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