Service switch for video display apparatus

Details Service switch for video display apparatus Service switch for video display apparatus

H - Electricity

04

N

350/1, 350/106

H04N 3/16 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1256987

RCA 82,780 ABSTRACT OF THE DISCLOSURE A vertical deflection circuit for a video display apparatus includes a service connection means or switch that collapses vertical or field rate scan in order to facilitate adjustment of cathode ray tube electron beam drive levels. The service switch operates by referencing the vertical sawtooth signal generator, the AC feedback, and the DC feedback to ground potential so that no input is applied to the vertical drive circuitry.

536686

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