KV-21XE42C - Sony TV Service Manual (repair manual). Page 18

   The following adjustments should be made when a
   complete realignment is required or a new picture
   tube is installed. These adjustments should be performed
   with rated power supply voltage unless otherwise noted.

The controls and switch should be set as follows
unless otherwise noted:

PICTURE control ................. normal

BRIGHTNESS control ......... normal

Feed in the white pattern signal.

Before starting, degauss the entire screen.

1. Input a raster signal with the pattern generator.

2. Loosen the deflection yoke mounting screw, and set the

purity control to the center as shown in Fig.2.

3. Turn the raster signal of the pattern generator to

green.

4. Move the deflection yoke backward, and adjust with the

purity control so that green is in the center and red and
blue are at the sides evenly. (Fig.3)

5. Move the deflection yoke forward, and adjust so that the

entire screen becomes green. (Fig.1)

6. Switch over the raster signal to red and blue and confirm

the condition.

7. When the position of the deflection yoke is determined,

tighten it with the deflection yoke mounting screw.

8. When landing at the corner is not right, adjust by using

the disk magnets. (Fig.4)

 Perform the adjustments in order as follows:

1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2) and White Balance

  Note:  Test Equipment Required

1.  Color Bar Pattern Generator
2. Degausser
3.  DC Power Supply
4.  Digital Multimeter