KV-21FT250
KV-21FT250
20
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.
Set the controls as follows unless otherwise noted:
Picture control
NORMAL
Brightness control NORMAL
SECTION 3: SET-UP ADJUSTMENTS
Perform the adjustments in order as follows:
1.
Beam
Landing
2.
Convergence
3.
Focus
4.
Screen
(G2)
5.
White
Balance
Note Test Equipment Required:
1.
Color Bar Pattern Generator
2.
Degausser
3.
DC Power Supply
4.
Digital
Multimeter
3-1. BEAM LANDING ADJUSTMENT
Before beginning adjustment procedure:
1. Feed in the white pattern signal.
2. In order to reduce the geomagnetism on the set’s picture tube, face
it east or west.
Adjustment Procedure
1. Input a raster signal with the pattern generator.
2. Loosen the defl ection 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 defl ection yoke backward, and adjust with the purity
control so that green is in the center and red and blue are even on
both sides.
Red
Blue
Green
5. Move the defl ection yoke forward, and adjust so that the entire
screen becomes green.
6. Switch over the raster signal to red and blue and confi rm the
condition.
7. When the position of the defl ection yoke is determined, tighten it
with the defl ection yoke mounting screw.
8. If landing at the corner is not right, adjust by using the disk
magnets.
Purity control
corrects this area.
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
a
b
b
c
c
d
d
a
5.
Oscilloscope
6.
Landing
Checker
7.
XCV
Adjuster
