Television 1 Jess Role @ UEAB 2006 Television Horizontal Section

Television 1 Jess Role @ UEAB 2006

Television Television Horizontal Horizontal

SectionSection


Comparison o f a black and Comparison o f a black and white television Horizontal white television Horizontal

sectionsection Booth drive sawtooth signal that runs to the Booth drive sawtooth signal that runs to the

deflection yoke.deflection yoke. Booth have high voltage about 30,000V and Booth have high voltage about 30,000V and

about 20,000 for black and white.about 20,000 for black and white. Picture tubes that uses high voltage Picture tubes that uses high voltage

electrostatic focus requiring approximately electrostatic focus requiring approximately 6,000 volts6,000 volts

Booth have the output stageBooth have the output stage For colored it requires anti-pincushioning For colored it requires anti-pincushioning

circuits these are not found In a B & Wcircuits these are not found In a B & W B & W have less radiation compare to colored B & W have less radiation compare to colored


Horizontal Output AmplifierHorizontal Output AmplifierColored Television Colored Television

horizontal output is just the horizontal output is just the same as the Black and same as the Black and

whitewhite Flyback functionFlyback function Flyback acts as step down transformer Flyback acts as step down transformer

between horizontal amplifier and the yokebetween horizontal amplifier and the yoke Act as stepdown transformer supply Act as stepdown transformer supply

AC voltage for the picture tube heater AC voltage for the picture tube heater and rectifier.and rectifier.

Supplies retrace pulses for the use of Supplies retrace pulses for the use of other sources. (AGC, AFC and other sources. (AGC, AFC and horizontal retrace blankinghorizontal retrace blanking


Horizontal Scanning Center Horizontal Scanning Center to the rightto the right

Supply is given to the electron beam Supply is given to the electron beam of the picture tubeof the picture tube

RetraceRetrace


Controls in the Controls in the horizontal Sectionhorizontal Section

Horizontal HoldHorizontal Hold Horizontal lineHorizontal line FocusFocus Horizontal width Horizontal width High voltage adjustHigh voltage adjust


ProblemsProblems

Picture widthPicture width Blurred picture Blurred picture Horizontal lineHorizontal line Picture rolling sidewaysPicture rolling sideways Distorted picturesDistorted pictures


Typical Horizontal output Amplifier Black and White


Horizontal Output StageHorizontal Output Stage


Horizontal deflection Horizontal deflection illustrationillustration


Voltage Voltage and and

current current relationsrelations

hiphip


Horizontal output Horizontal output amplifieramplifier


Horizontal output used Horizontal output used in colorin color


FlybacFlybackk


Effect of open balancingEffect of open balancing


Narrow raster due to Narrow raster due to shorted Turns in flybackshorted Turns in flyback


Horizontal keystoneHorizontal keystone


Horizontal Output Amplifier Horizontal Output Amplifier ControlsControls


Basic High Voltage Basic High Voltage CircuitCircuit


Split high voltage flyback Split high voltage flyback TransformerTransformer



High Voltage Focus power High Voltage Focus power supplysupply


High-Voltage Divider High-Voltage Divider FocusFocus


High voltage hold-down High voltage hold-down circuit used in transistorcircuit used in transistor


Horizontal frequency hold-Horizontal frequency hold-Down circuitDown circuit


Horizontal Output With Horizontal Output With High VoltageHigh Voltage


Block Diagram Zenith Block Diagram Zenith Horizontal DeflectionHorizontal Deflection


Zenith Self-regulation Zenith Self-regulation systemsystem



Using SCR in deflection Using SCR in deflection associated with waveformassociated with waveform


Vacuum Tube Horizontal Vacuum Tube Horizontal outputoutput


Documents

Television 1 Jess Role @ UEAB 2006 Television Horizontal Section