16
•
When complete readjustment is necessary or a new
picture tube is installed, carry out the following
adjustments.
•
Unless there are specific instructions to the contrary,
carry out these adjustments with the rated power supply.
•
Unless there are specific instructions to the contrary, set the
controls and switches to the following settings :
Contrast
...............
80% [or remote control normal]
Brightness
...............
50%
Carry out the following adjustments in this order :
3-1.
Beam Landing
3-2.
Convergence
3-4.
Focus
3-3.
White balance
Note :
Test equipment required
1.
Color bar/pattern generator.
2.
Degausser.
3.
Oscilloscope.
4.
Digital multimeter.
5.
DC Power supply.
SECTION 3
SET-UP ADJUSTMENTS
KV-25X5
GREEN
BLUE
RED
a
b
c
d
a
c
b
d
Purity control corrects
this area.
Deflection yolk positioning
corrects these areas.
Disk magnets or
rotatable disk
magnets correct
these areas (a - d).
Purity control
Deflection yolk
Preparation:
1.
In order to reduce the influence of geomagnetism on the set’s
picture tube, face it in an easterly or westerly direction.
2.
Switch on the TV set’s power and degauss with the
degausser.
3-1. BEAM LANDING
1.
Input an all-white signal from the pattern generator.
Set the Contrast and Brightness to normal.
2.
Set the pattern generator raster signal to all Red.
3.
Move the deflection yolk forward and adjust with the purity
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
4.
Move the deflection yolk forward and adjust so that the entire
screen becomes Red. [See Fig.3-1].
5.
Switch the raster signal to Blue, then to Green and verify the
purity condition.
6.
When the position of the deflection yolk has been determined,
fasten the deflection yolk with the screws.
7.
If the beam does not land correctly in all the corners, use
magnets to correct it. [See Fig.3-4].
Fig. 3-1
Fig. 3-2
Fig. 3-3
Fig. 3-4
