Tatung VM77S Service Manual - page 17
Page 16
Alignments and Adjustments
VM77S
4 Full white ABL setting
CONDITION
Display image : full white pattern
4-a
Set Brightness to cutoff and Contrast to maximum.
4-b.
Adjust ABL to Y=29.5FL ± 0.5FL.
4-c.
Check the white balance at 5FL and 28FL.
4-d.
Repeat all the procedures in 4-2-2 section until the best white balance is obtained.
4-2-3 Focus Adjustment
CONDITION
Display image : “me” character pattern (68.68 kHz Mode)
PROCEDURE
1. Set Brightness to cutoff and Contrast to maximum.
2. Adjust focus 1 at T402 (static focus VR) to make vertical line clear.
3. Adjust focus 2 at T402 (static focus VR) to make horizontal line clear.
4. Repeat above procedures to get best focus.
4-2-4 Static Convergence Adjustments
Static convergence involves alignment of the red, blue and green lines in the center area of the display.
Note :
The monitor requires 30 minutes of warm-up time for convergence adjustment.
CONDITION
Display image : Crosshatch pattern
Warm-up Time : 30 minutes
PROCEDURE
1. Set Brightness and Contrast to display a well-defined pattern.
2. Ensure the convergence magnet rings are correctly positioned on the CRT.
Figure 4-1. Convergence Magnets on the CRT
+
8 76 5 4 3 2
10
1
11
CRT
FRONT
P
9
1) Setup Bolt
2) Bow Magnet
3) Band
4) 2-Pole Magnet
5) Spacer
7) Spacer
9) Holder
6) 4-Pole Magnet
8) 6-Pole Magnet
11) Tabs
10) Band