Set-Up Adjustments; 3-1.Beam Landing - Sony TRINITRON KV-20M20 Service Manual

SECTION 3
SET-UP ADJUSTMENTS
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.
The controls and switch should be set as follows
unless otherwise noted:
PICTURE control ........:.c000 normal
Perform the adjustments in order as follows:
Feb
Beam Landing
Convergence
Focus
Screen (G2) and White Balance
Note: Test Equipment Required
1. Color bar Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital multimeter
Preparation:
Feed in the white pattern signal.
Before starting, degauss the entire screen.
3-1. BEAM LANDING
1.
2.
Input a raster signal with the pattern generator.
Loosen the deflection yoke mounting screw, and set the
purity control to the center as shown in Fig.2.
Turn the raster signal of the pattern generator to
green.
Move the deflection yoke backward, and adjust with the
purity control so that green is in the center and red and
blue are at the sides evenly. (Fig.3)
Move the deflection yoke forward, and adjust so that the
entire screen becomes green. (Fig.1)
Switch over the raster signal to red and blue and confirm
the condition.
When the position of the deflection yoke is determined,
tighten it with the deflection yoke mounting screw.
When landing at the corner is not right, adjust by using
the disk magnets. (Fig.4)
-13-
Disk magnets or
rotatable disk
magnets correct
these areas (a-d).
Deflection yoke
positioning corrects these
Fig. 4