Service adjustment arrangement for a sawtooth generator of a video display
AssigneeThomson Consumer Electronics, Inc.
InventorsKarl R. Koblitz, James A. Wilber, Enrique Rodriguez-Cavazos
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Abstract
In a vertical sawtooth generator of a D.C. coupled vertical deflection circuit, a vertical deflection amplifier generates a sawtooth signal. Magnitudes of the sawtooth signal in first and second instants of its trace period are determined in accordance with first and second D.C. signals, respectively. The first and second D.C. signals are adjusted during service to control the raster height and the raster centering such that while the raster height is adjusted, raster centering is not significantly affected, and vice versa.
Claims8
A video display deflection apparatus, comprising:
- a cathode ray tube;
- a deflection circuit amplifier responsive to a sawtooth signal and coupled to a deflection winding that is mounted on a neck of said cathode ray tube to form a D.C. coupled deflection circuit with respect to said sawtooth signal for generating a deflection current in said deflection winding at a magnitude that is determined in accordance with said sawtooth signal to form a raster in a screen of said cathode ray tube;
- means for generating a raster centering control signal that is adjustable to provide for raster centering adjustment;
- means for generating a raster height control signal that is adjustable to provide for raster height adjustment;
- and
- means responsive to said raster centering and raster height control signals for generating said sawtooth signal such that the adjustment of said raster height control signal does not substantially affect raster centering adjustment.
Dependencies are inferred from the claim text.