Set-up arrangement for a color television receiver

Details Set-up arrangement for a color television receiver Set-up arrangement for a color television receiver

H - Electricity

04

N

350/1, 350/79

H04N 9/16 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1066402

SET-UP ARRANGEMENT FOR A COLOR TELEVISION RECEIVER Abstract of the Disclosure 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 auto- matically 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. The service switch controls various portions of the receiver by means of DC controls thereby minimizing noise pickup which may otherwise result if alternating control signals were utilized. -1-

253166

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