Abstract: A service switch to permit set-up adjustment of a color image reproducing kinescope in a color television receiver. The receiver comprises a horizontal deflection circuit for providing a periodic horizontal deflection signal having a frequency synchronized by a sync signal derived from a composite color video signal, and means for deriving a receiver operating voltage from the periodic signal of a magnitude dependent upon the frequency of the periodic signal. The switch has "normal" and "service" positions, and is coupled to respective direct voltage control terminals of luminance and chrominance channels and a vertical deflection circuit of the receiver. In the "service" position, the switch renders the luminance and chrominance channels inoperative to couple signals, and vertical scanning is disabled, to permit set-up adjustment of the kinescope.

Abstract: A transversal equalizer is included in the luminance channel of a television receiver. Delayed video signals developed at taps of the transversal equalizer are combined to provide an output signal including preshoots and overshoots to accentuate amplitude transitions in the video signal so that, for example, a tonal transition from black to white is blacker than it normally would be just prior to the transition, and whiter than it normally would be just after the transition. The transversal equalizer includes provisions for selectively combining portions of predetermined delayed signals dependent upon the direction of the amplitude transitions such that preshoots and overshoots in one direction, e.g., the white direction, are relatively compressed or otherwise suppressed with respect to preshoots and overshoots in the other, i.e., black, direction.

Abstract: A service switch is provided for a color television receiver of the type including, in the order named, a black level clamping circuit, a brightness control circuit and an amplifier for coupling luminance signals to an image reproducing kinescope. A reserve blanking circuit is coupled to the output of the amplifier for rendering the kinescope inoperative during the vertical retrace-horizontal trace intervals to inhibit the formation of disconcerting horizontal trace lines. In a "raster" position, the service switch is operative to provide a blank raster and to automatically increase the brightness of the raster to a level sufficient to permit purity adjustments. In a "service" position, the service switch is operative to disable the operation of the reserve blanking circuit and to alter the brightness control circuit to permit color temperature adjustments.