akira CT-21FD9 Series, Service Manual

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Model No: CT-21FD9CP_21FD9M
Version 1.0
2-3 CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence adjustment, the receiver should be operated for at
least 15 minutes.
2-3-1 CENTER CONVERGENCE ADJUSTMENTS
1. Receive a crosshatch pattern with a color bar signal generator.
2. Adjust the BRIGHTNESS and CONTRAST controls for a well-defined pattern.
3. Adjust two tabs of the 4-pole Magnets to change the angle between them (See figure
(3) and superimpose red and blue vertical lines in the center area of the picture
screen.
4. Turn both tabs at the same time keep in their angles constant to superimpose red and
blue horizontal lines at the center of the screen. (See figure 4).
5. Adjust two tabs of 6-Pole Magnets to superimpose red/blue line with green one.
Adjusting the angle affects the vertical lines and rotating both magnets affects the
horizontal lines.
6. Repeat adjustment 3, 4, 5 Keeping in mind red. green and blue movement, because
4-Pole Magnets and 6-Pole Magnets interact and make dot movement complex.