![background image](http://html1.mh-extra.com/html/bandk/1076/1076_instruction-manual_3073936038.webp)
The color demodulators are now properly aligned so that no + (R-Y) signal
gets through the
+
(B-Y) demodulator, and also no (B-Y), signal gets
R-Y DEMOD.
OUTPUT
Figure 20-(R-Y) demodulat.or output as seen on an oscilloscope
through the + (R-Y) demodulator. Also the front panel hue control is in the
middle of its range to allow variations in both directions if necessary.
B-Y DEMOD.
OUTPUT
Figure 21-(B-Y) demodulat.or output as seen on an oscilloscope
This completes the hue control and demodulator adjustments.
HOW TO ADJUST COLOR PURITY AND CONVERGENCE
Adjusting Color TV Purity and Static Cqnvergence
The first adjustment normally made on a color set is purity. It is best to
follow the set manufacturers' procedure for purity adjustment. It is, how
ever, most desirable to make this purity adjustment on a blank synchronized
raster. This can be accomplished by connecting the generator to the col6r
receiver antenna terminal and tuning in a test pattern, as previously explained.
Then remove slide from pattern generator and make purity adjustment on
synchronized blank raster.
For static convergence adjustments it is necessary to use the white dot slide
supplied with your Television Analyst. The size of the dot supplied by the
Analyst has been selected for the most accurate convergence adjustment.
Since static convergence is performed using only the center dot, this dot is
surrounded on the Analyst pattern with a series of square dots. This makes it
convenient to identify the center dot.
The following procedure is recommended for setting the Analyst to produce
a clear, clean dot for use in color convergence.
1. Use the test pattern slide of the Analyst and obtain a good black and
white pattern on the color receiver. Keep the RF Attenuator setting
as low as possible when making this adjustment.
2. Remove the test pattern slide and insert the dot slide. Readjust the
brightness and contrast controls on the receiver to get the proper
dot display. Use as low a brightness level as possible on the television
receiver to keep the dot from blooming and becoming enlarged. It
may be necessary to slightly increase the video output of the Analyst.
Excessive video level on the· Analyst will also cause the spot to bloom.
Improper adjustment of the brightness and contrast control of the
receiver or improper adjustment of the video control on the Analyst
may result in an unstable dot pattern and blurred dots. It must be
emphasized again that the brightness level of the television set must
be as low as possible to prevent defocusing of the dot.
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