H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/106
H04N 17/04 (2006.01) H03K 4/69 (2006.01) H04N 3/16 (2006.01)
Patent
CA 1292559
ABSTRACT In a video display apparatus having a service mode capability, a vertical deflection circuit includes a vertical deflection winding coupled to a DC blocking capacitor. An output stage is coupled to the vertical deflection winding at an output terminal. A vertical sawtooth voltage generator is coupled to a driver stage for driving the output stage at a vertical rate in a sawtooth manner to generate a sawtooth deflection current in the deflection winding and for establishing a DC operating voltage level at the output terminal that charges the DC blocking capacitor. The sawtooth generator includes a second capacitor that, during normal operation, is charged in a sawtooth manner via a resistor for developing a sawtooth signal. A service mode switching circuit is coupled to the resistor for asserting the service mode of operation by preventing the charging of the second capacitor via the resistor. A DC feedback loop maintains the DC blocking capacitor charged during the service mode.
593893
Craig Wilson And Company
Rca Licensing Corporation
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