SONY KV28WF1E
Manual de Servicio

KV-28WF1

SECTION 3 SET-UP ADJUSTMENTS
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When complete readjustment is necessary or a new picture tube is installed, carry out the following adjustments. Unless there are specific instructions to the contrary, carry out these adjustments with the rated power supply. Unless there are specific instructions to the contrary, set the controls and switches to these settings : ............ 80% (or remote control normal) Brightness ........... 50% 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. Contrast

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1. 2. 3. 4.

Carry out the following adjustments in this order : Beam landing Convergence Focus White balance

Note: Testing equipment required. 1. Color bar/pattern generator 2. Degausser 3. DC power supply 4. Digital multimeter 5. Oscilloscope
Fig. 3-2

Purity control

A buckle NECK ASSY G1 G2

3-1. BEAM LANDING
1. Input the white signal with the pattern generator. CONTRAST normal BRlGHTNESS 2. Set the pattern generator raster signal to red. 3. Move the deflection yoke forward and adjust with the purity control so that the red is at the centre and the blue and the green take up equally sized areas on each side. (See Fig. 3-1 - 3-3) 4. Move the deflection yoke forward and adjust so that the entire screen becomes red. (See Fig. 3-1) 5. Switch the raster signal to blue, then to green and verify the condition. 6. When the position of the deflection yoke has been decided, fasten the deflection yoke with the screws. 7. If the beam does not land correctly in all the corners, use a magnet to adjust it. (See Fig. 3-4)

Deflection yoke

Green Fig. 3-3 Red Blue

Purity control corrects this area.
a b

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

c

d

Deflection yoke positioning corrects these areas.

a c

Fig. 3-1

b

d

Fig. 3-4

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