Set-Up Adjustments; Beam Landing - Sony TRINITRON KV-20M42 Service Manual

KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
The following adjustments should be made when
a complete realignment is required or when a new
picture tube is installed.
These adjustments should be performed with rated
power supply voltage unless otherwise noted.
Set the controls and switch as follows unless
otherwise noted.
PICTURE control ................. Normal
BRIGHTNESS control ......... Normal

3-1. BEAM LANDING

Before beginning adjustment procedure:
1. Degauss the entire screen.
2. Feed in the white pattern signal.
Adjustment Procedure
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw and set the
purity control to the center as shown below.
Purity Control
3. Turn the raster signal of the pattern generator to green.
4. Move the deflection yoke backward and adjust the purity
control so that green is in the center and red and blue are
at the sides evenly.
SECTION 3

SET-UP ADJUSTMENTS

Blue Red
Green
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note: Test equipment required:
• Color bar pattern generator
• Degausser
• DC power supply
• Digital multimeter
5. Move the deflection yoke forward and adjust so that the
entire screen becomes green.
6. Switch over the raster signal to red and blue and confirm
the condition.
7. When the position of the deflection yoke is determined,
tighten it with the deflection yoke mounting screw.
8. If landing at the corner is not right, adjust by using the disk
magnets.
Purity control
corrects this area
a
c
Deflection yoke positioning
corrects these areas
b
— 14 —
b
Disk magnets
or rotatable disk
magnets correct
d
these areas (a-d)
a
c
d