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Television Horizontal Section

Television Horizontal Section. 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.

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Television Horizontal Section

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  1. Television Horizontal Section

  2. 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

  3. Horizontal Output AmplifierColored 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

  4. Horizontal Scanning Center to the right • Supply is given to the electron beam of the picture tube • Retrace

  5. Controls in the horizontal Section • Horizontal Hold • Horizontal line • Focus • Horizontal width • High voltage adjust

  6. Problems • Picture width • Blurred picture • Horizontal line • Picture rolling sideways • Distorted pictures

  7. Typical Horizontal output Amplifier Black and White

  8. Horizontal Output Stage

  9. Horizontal deflection illustration

  10. Voltage and current relationship

  11. Horizontal output amplifier

  12. Horizontal output used in color

  13. Flyback

  14. Effect of open balancing

  15. Narrow raster due to shorted Turns in flyback

  16. Horizontal keystone

  17. Horizontal Output Amplifier Controls

  18. Basic High Voltage Circuit

  19. Split high voltage flyback Transformer

  20. High Voltage Focus power supply

  21. High-Voltage Divider Focus

  22. High voltage hold-down circuit used in transistor

  23. Horizontal frequency hold-Down circuit

  24. Horizontal Output With High Voltage

  25. Block Diagram Zenith Horizontal Deflection

  26. Zenith Self-regulation system

  27. Using SCR in deflection associated with waveform

  28. Vacuum Tube Horizontal output

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