| 摘要 |
A serivice switch is provided for a color television receiver of the type including, in the other named, a black level clamping circuit, a brightness control circuit and an amplifier for coupling luminance signals to an image reproducing line scope. A reserve blanking circuit is coupled with the output of the amplifier for rendering the kinescope in operative during the vertical retrace-horizontal trace intervals to inhibit the formation of disconcerting horizontal trace lines. In a raster position, the service switch is operated to provide a blank raster and to automatically increase the brightness of raster to a level sufficient to permit purity adjustment.
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