Read Sony KV-28WX2A Service Manual online
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KV-28WX2
•
When complete readjustment is necessary or a new picture
tube is installed, carry out the following adjustments.
tube is installed, carry out the following adjustments.
•
Unless there are specific instructions to the contrary, carry
out these adjustment with the rated power supply.
out these adjustment with the rated power supply.
•
Unless there are specific instructions to the contrary, set the
controls and switches as follows.
controls and switches as follows.
Contrast ............ normal
Brightness ........ normal
Brightness ........ normal
•
Carry out the following adjustments in this order:
3-1. Beam landing
3-2. Convergence
3-3. Focus
3-4. White balance
3-2. Convergence
3-3. Focus
3-4. White balance
Note:Testing equipment required.
1. Color bar/pattern generator
2. Degausser
3. Vector scope
2. Degausser
3. Vector scope
3-1. BEAM LANDING
Preparation:
1. In order to reduce the influence of geomagnetism on the set’s
1. In order to reduce the influence of geomagnetism on the set’s
picture tube face it in an easterly or westerly direction.
2. Switch on the set’s power and degauss with the degausser.
(1) Adjustment of Correction Magnet for Y-Splitting
Axis
Axis
1. Input a crosshatch signal from the pattern generator.
2. Picture control is minimum and brightness control is still
2. Picture control is minimum and brightness control is still
normal.
3. Position the neck assy as shown in Fig. 3-2.
4. Move the deflection yoke forward to touch the CRT and it
4. Move the deflection yoke forward to touch the CRT and it
stands up rightly.
5. Adjust the upper pin and the lower pin symmetrically by
opening or closing the Y-splitting axis correction magnets
on the neck assy.
on the neck assy.
6. Return the deflection yoke to its original position.
SECTION 3
SET-UP ADJUSTMENTS
(2) Landing
Note: Before carrying out the following adjustments adjust the
magnets as indicated below (See Fig.3-3).
1. Input an all-white signal from the pattern generator.
Maximize the picture setting and adjust the brightness setting.
2. Rough-adjust the focus and horizontal convergence.
3. Loosen the deflection yoke screws, align the purity adjustment
3. Loosen the deflection yoke screws, align the purity adjustment
knob to the central position. (See Fig. 3-1)
4. Switch from the all-white pattern to an all-green pattern.
5. Move the deflection yoke backwards and adjust with the
5. Move the deflection yoke backwards and adjust with the
purity magnet so that the green is at the center and it aligns
symmetrically. (See Fig. 3-4)
symmetrically. (See Fig. 3-4)
6. Move the deflection yoke forward and adjust so that entire
screen becomes green.
7. Switch the raster signal to red, then to blue and verify the
landing condition.
8. When the position of the deflection yoke has been
determined, fasten the deflection yoke with the screw.
9. If the beam does not land correctly in all the corners, use
magnets to correct it. (See Fig. 3-5)
Purity Adjustment
Fig.3-1
Neck assy
Align the bottom edge of the neck
assy with the G3 hole center.
assy with the G3 hole center.
Fig.3-2
Y-splitting axis correction magnet
Align Pips
on each
magnet
on each
magnet
Fig.3-3
Deflection yoke
Purity
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