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Television Horizontal Section Television 1 Jess Role @ UEAB 2006 Comparison o f a black and white television Horizontal section Booth drive sawtooth signal that runs to the deflection yoke. Booth have high voltage about 30,000V and about 20,000 for black and white. Picture tubes that uses high voltage electrostatic focus requiring approximately 6,000 volts Booth have the output stage For colored it requires anti-pincushioning circuits these are not found In a B & W B & W have less radiation compare to colored Television 1 Jess Role @ UEAB 2006 Colored Television horizontal output is just the same as the Black and white Flyback function Flyback acts as step down transformer between horizontal amplifier and the yoke Act as stepdown transformer supply AC voltage for the picture tube heater and rectifier. Supplies retrace pulses for the use of other sources. (AGC, AFC and horizontal retrace blanking Television 1 Jess Role @ UEAB 2006 Horizontal Scanning Center to the right Supply is given to the electron beam of the picture tube Retrace Television 1 Jess Role @ UEAB 2006 Controls in the horizontal Section Horizontal Hold Horizontal line Focus Horizontal width High voltage adjust Television 1 Jess Role @ UEAB 2006 Problems Picture width Blurred picture Horizontal line Picture rolling sideways Distorted pictures Television 1 Jess Role @ UEAB 2006 Typical Horizontal output Amplifier Black and White Television 1 Jess Role @ UEAB 2006 Horizontal Output Stage Television 1 Jess Role @ UEAB 2006 Horizontal deflection illustration Television 1 Jess Role @ UEAB 2006 Voltage and current relationship Television 1 Jess Role @ UEAB 2006 Horizontal output amplifier Television 1 Jess Role @ UEAB 2006 Horizontal output used in color Television 1 Jess Role @ UEAB 2006 Flyback Television 1 Jess Role @ UEAB 2006 Effect of open balancing Television 1 Jess Role @ UEAB 2006 Narrow raster due to shorted Turns in flyback Television 1 Jess Role @ UEAB 2006 Horizontal keystone Television 1 Jess Role @ UEAB 2006 Horizontal Output Amplifier Controls Television 1 Jess Role @ UEAB 2006 Basic High Voltage Circuit Television 1 Jess Role @ UEAB 2006 Split high voltage flyback Transformer Television 1 Jess Role @ UEAB 2006 Television 1 Jess Role @ UEAB 2006 High Voltage Focus power supply Television 1 Jess Role @ UEAB 2006 High-Voltage Divider Focus Television 1 Jess Role @ UEAB 2006 High voltage hold-down circuit used in transistor Television 1 Jess Role @ UEAB 2006 Horizontal frequency hold-Down circuit Television 1 Jess Role @ UEAB 2006 Horizontal Output With High Voltage Television 1 Jess Role @ UEAB 2006 Block Diagram Zenith Horizontal Deflection Television 1 Jess Role @ UEAB 2006 Zenith Self-regulation system Television 1 Jess Role @ UEAB 2006 Television 1 Jess Role @ UEAB 2006 Using SCR in deflection associated with waveform Television 1 Jess Role @ UEAB 2006 Vacuum Tube Horizontal output Television 1 Jess Role @ UEAB 2006 Television 1 Jess Role @ UEAB 2006
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