Set-Up Adjustments; Beam Landing - Sony TRINITRON KV-XF21M61 Service Manual

KV-XF21M61/XF21M63/XF21M65
KV-XF21M80/XF21M90
•
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
•
These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switches should be set as follows unless otherwise noted:
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.

3-1. BEAM LANDING

1. Input a white signal with the pattern generator.
}
Contrast
normal
Brightness
2. Position neck assy as shown in Fig3-2.
3. Set the pattern generator raster signal to a green raster.
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 the 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 and DY spacers.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
RM-952

SET-UP ADJUSTMENTS

Fig. 3-1
SECTION 3
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Note:
Neck Assy is exactly behind
DY (no gap between Neck
Assy and DY)
Purity control corrects
this area.
b
c
Deflection yoke positioning
corrects these areas.
a
d
– 28 –
Neck assy
DY
Fig. 3-2
Blue
Red
Green
Fig. 3-3
Disk magnets or rotatable
a disk magnets correct
these areas (a-d).
d
b
c
Fig. 3-4