Convergence Adjustment; Center Convergence Adjustment - Changhong Electric 21NF55 Service Manual

Glass Cloth Tapes
6-pole Magnet
4-pole Magnet
Purity Magnet
Convergence Magnet Assembly

2. Convergence Adjustment

Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.

2.1 Center convergence adjustment

2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6 -pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps2.1.3-2..1.5 until optimal convergence is
SERVICE MANUAL
Deflection Coil
Purity/Convergence
Magnet Module
Adjust the Angle (Vertical Lines)
Dummy Wedge
Deflection Yoke
Fig. 1
Adjustment of Magnets
Fig. 2
6
Rubber Wedge
Adhesive
Fixed
Rotate Two Tabs At the
Same Time (Horizontal Lines)