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The Block Diagram above reveals the theory of op-
eration of the Convergence Circuitry to be same as
in previous models. Horizontal and vertical pulses
are input to the Convergence Waveform Generator.
The Convergence Generator outputs six digital con-
vergence correction signals:
• Red Horizontal Correction
• Green Horizontal Correction
• Blue Horizontal Correction
• Red Vertical Correction
• Green Vertical Correction
• Blue Vertical Correction
The digital correction signals are directed D/A Con-
version circuitry and are converted to analog sig-
nals.
Chapter 10
Convergence Circuitry
The signals then pass through LPF circuitry, remov-
ing any remaining high frequency digital signals. Then
the signals are amplified in Summing Amplifiers.
Green correction is added to the red and blue signals
at the inputs of the Summing Amplifiers.
The signals are then further amplified in Convergence
Output circuitry and directed to the Sub Coils in their
respective Deflection Yoke.
The Convergence Generator also develops the RGB
signal for the cross hatch pattern used during con-
vergence alignments
Closer examination of the Convergence Circuitry will
show the main difference in the V19/V21 is fewer ICs
are used.
10-1
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