Set-Up Adjustments; 2-1. Beam Landing - Sony TRINITRON KV-21CT1B Servicehandbuch

KV-21CT1B/21CT1U/21CT1E/21CT1K
• 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 : LIVE
1. Input a white signal with the pattern generator.
Set the contrast and brightness to normal.
2. Set the pattern generator raster signal to a green raster.
3. Move the deflection yoke to the rear and adjust with the
purity control so that the green is at the centre and the
blue and red take up equally sized areas on each side
of the screen. (see figure 2-1 and figure 2-1-1)
Figure 2-1
4. Move the deflection yoke forward and adjust so that the
entire screen is green. (see figure 2-1-2)
5. Switch the raster signal to blue, then red and verify the
condition.
6. When the position of deflection yoke have been
decided, fasten the deflection yoke with the screws and
DY spacers.
RM-W100

SET-UP ADJUSTMENTS

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Purity control
Figure 2-1-1
Blue
Red
Green
Figure 2-1-2
SECTION 2
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note : Test Equipment Required.
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
5. Oscilloscope
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
7. If the beam does not land correctly in all the corners,
use a magnet to correct if. (see figure 2-1-3)
Purity control
corrects this area.
Deflection yoke positioning
corrects these areas.
Caution:
High voltages are present on the Deflection yoke
terminals. Take care when handling the deflection yoke
whilst carrying out adjustments.
– 10 –
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Disk magnets or rotatable
disk magnets correct these
areas (a-d).
a
b
d
c
b
c
a
d
Figure 2-1-3
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○