KV-SZ29M31 (serv.man2) - Sony TV Service Manual (repair manual). Page 8

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The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.

The controls and switch should be set as follows unless
otherwise noted:
Picture Control....................................."NORMAL"
Brightness Control..............................."NORMAL"

Perform the adjustments in order as follows :

1. Beam Landing
2. Convergence
3. Focus
4. G2(SCREEN)
5. White Balance

Note : Test Equipment Required.

1. Pattern Generator

5. Oscilloscope

2. Degausser

6. Landing Checker

3. DC Power Supply

7. XCV Adjuster

4. Digital Multimeter

Preparation :
• Feed in the white pattern signal.
• Before starting, degauss the entire screen with the

degausser.

• In order to reduce the geomagnetism on the set's picture

tube, face it east or west.

1. Input a raster signal with the pattern generator.
2. Loose the deflection yoke(DY) mounting screw, and set

the purity control to the center as shown below:-

3. Position VM coil as shown below:-

4. Set the raster signal of the pattern generator to green.
5. Move the DY backward and adjust the purity control so

that green is in the center and blue and red are at the
sides evenly.

Red

Blue

Green

a

b

b

c

c

d

d

a

Purity control
corrects this area.

Disc magnets or rotatable
disc magnets correct these
areas (a-d).

Deflection yoke positioning
corrects these areas.

Purity control

VM coil

G2

G1

G3

Align the edge of
the VM coil with
the edge of the G3 grid.

G4

......................................................................................................................................................................................................................

6. Then move the DY forward and adjust so that the entire

screen becomes green.

7. Now switch over raster signal to red then blue and

confirm the condition.

8. When the position of the DY is determined, tighten it with

the DY mounting screw.

9. If the beam does not land correctly in all the corners of

the screen, use magnet disc to correct it.