Sony TRINITRON KV-A2121D - Page 20

Preparations: (29 inch)
e
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.
ed
Input the white signal with the pattern generator.
Contrast
Bightness
Position neck ass’y as shown in Fig 3-2.
Set the pattern generator raster signal to red.
Move the deflection yoke to the rear and adjust
with the purity control so that the red is at the
center and the blue and the green take up
equally sized areas on each side.
(See Figures 3-1 through 3-3.)
Move the deflection yoke forward and adjust so
that entire screen is red. (See Figure 3-1.)
Switch the raster signal to blue, then to green
and verify the condition.
When the position of the deflection yoke has
been decided, fasten the deflection yoke with the
screws.
If the beam does not land correctly in all the
corners, use a magnet to adjust it.
(See Figure 3-4.)
| normal
rere Deflection yoke 0c
Fig. 3-2
Disk magnets or
rotatable disk
magnets correct
these areas (a—d).
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