Set-Up Adjustments; Beam Landing - Sony TRINITRON KV-AR25M90B Service Manual

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Service manual (96 pages)

Table of Contents

The following adjustments should be made when a

complete realignment is required or a new picture tube is

installed.

Set the controls as follows unless otherwise noted:

VIDEO MODE: .................................................... Standard

PICTURE CONTROL: ......................................... Normal

BRIGHTNESS CONTROL: ................................. Normal

○

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.

2-1. BEAM LANDING

PICTURE MODE: DYNAMIC

1. Input a white signal with the pattern generator.

Contrast

}

normal

Brightness

2. Position neck assy as shown in Fig 2-1.

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

4. Move the deflection yoke to the rear and adjust with

purity control so that the green is at the center and the

blue and the red take up equally sized areas on each

side. (Figures 2-2 through 2-4.)

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

entire screen is green. (Figure 2-2.)

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

condition.

7. When the position of the deflection yoke have been

decided, fasten the deflection yoke with the screws and

DY spacers.

8. If the beam does not land correctly in all the corners, use

a magnet to adjust it.

(Figure 2-5.)

Neck assy

Align the edge of

the neck assy with

the edge of the G2 grid.

Fig. 2-1

SECTION 2