Sony KV-G21L3 service manual Section SET-UP Adjustments, Beam Landing, Preparation

KV-G21L3

RM-883

SECTION 3

SET-UP ADJUSTMENTS

•	The following adjustments should be made when a complete	Perform the adjustments in the following order
	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 power and degauss with the degausser.

3-1. BEAM LANDING

1.Input a white signal with the pattern generator.

Contrast }

normal

Brightness

2.Set the pattern generator raster signal to a green raster.

3.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.)

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

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

6.When the position of the deflection yoke has been decided, fasten the deflection yoke with the screw.

7.If the beam does not land correctly in all the corners, use a magnet to adjust it.

(See Figure 3-4.)

Fig. 3-1

Purity Control

Fig. 3-2

BLUE RED

GREEN

Fig. 3-3

Purity control corrects this area.

		Disk magnets or rotatable
b	a	disk magnets correct
		these areas (a-d).

cd

Deflection yoke positioning corrects these areas.

b

c

a

d

Fig. 3-4

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