Sony KV-T29SN81 service manual Section SET-UP Adjustments, Beam Landing

KV-T29SN81

RM-870

SECTION 3

SET-UP ADJUSTMENTS

∙ The following adjustments should be made when a complete		Perform the adjustments in order as follows :
realignment is required or a new picture tube is installed.		1.	Beam Landing
∙ These adjustments should be performed with rated power		2.	Convergence
supply voltage unless otherwise noted.		3.	Focus
		4.	White Balance
Controls and switch should be set as follows unless otherwise noted:			Note : Test Equipment Required.
PICTURE control	normal		1.	Color-bar/Pattern Generator
BRIGHTNESS control	normal		2.	Degausser
			3.	Oscilloscope

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Preparation :

∙In order to reduce the influence of geomagnetism on the set's picture tube face it east or west.

∙Switch on the set's power and degauss with the degausser.

3-1. BEAM LANDING

1.Input a white signal with the pattern generator.

Contrast }

normal

Brightness

2.Position neck assy as shown in Figure 3-1.

3.Set the pattern generator raster signal to green.

4.Move the deflection yoke to the rear and adjust with the purity control so that the green is at the center and the blue and the red take up equally sized areas on each side.

(See Figures 3-1 through 3-3.)

5.Move the deflection yoke forward and adjust so that entire screen is green. (See Figure 3-1.)

6.Switch the raster signal to blue, then to red and verify the condition.

7.When the position of the deflection yoke has been decided, fasten the deflection yoke with the screws.

8.If the beam does not land correctly in all the corners, use a magnet to adjust it. (See Figure 3-4.)

Neck assy

G1 G2 G3

Fig. 3-1

Purity control

Fig. 3-2

BLUE RED

GREEN

Fig. 3-3

Purity control corrects this area.

Disk magnets or rotatable

ab disk magnets correct these areas (a-d).

cd

Deflection yoke positioning corrects these areas.

a

c

b

d Fig. 3-4

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