Monochrome Monochrome Television Television

Block DiagramBlock Diagram

Diagram Showing Input and Diagram Showing Input and OutputsOutputs

Television Receiver

Speaker

Power SupplyPicture Tube

All Section

AC Input

Black and White TelevisionBlack and White Television

Sound IF

AmplifierSound

DetectorAudio

Amplifier

TunerIF

AmplifierVideo

DetectorVideo

Amplifiers

AGC

AFCSync

Separator

Horizontal Oscillator

Vertical Sweep

Horizontal Output

High Voltage Power supply

Low Voltage Power Supply

Speaker

Picture Tube

All Stages

AC line

Function of each Block SectionFunction of each Block Section

Low Voltage Power Supply – this Low Voltage Power Supply – this power supply DC voltage in all power supply DC voltage in all section of the television. It is also a section of the television. It is also a place used to convert AC voltage to place used to convert AC voltage to DC voltage.DC voltage.

Sound IF Amp – received and Sound IF Amp – received and synchronize Sound signalsynchronize Sound signal

Sound detector- Sound detector-

Continuation…Continuation… Sound detector – filter the signal received from Sound detector – filter the signal received from

the sound IF amp. the sound IF amp. Audio Amplifiers- Amplify signal from the sound Audio Amplifiers- Amplify signal from the sound

detectordetector Tuner – Select the station or channel that you Tuner – Select the station or channel that you

desire.desire. Sound IF Amplifiers – received the signal emitted Sound IF Amplifiers – received the signal emitted

from the sound trapfrom the sound trap Video Detector – filter the signal received from Video Detector – filter the signal received from

the video IF ampthe video IF amp Video Amplifier - Amplify the video received from Video Amplifier - Amplify the video received from

the video detector section.the video detector section.

Continuation…Continuation…

AGCAGC AFCAFC Sync separatorSync separator Vertical SweepVertical Sweep Horizontal OscillatorHorizontal Oscillator Horizontal OutputHorizontal Output High Voltage Power SupplyHigh Voltage Power Supply Picture tubePicture tube Deflection YokeDeflection Yoke

Color TelevisionColor Television

Sound IF

AmplifierSound

DetectorAudio

Amplifier

TunerIF

AmplifierVideo

DetectorVideo

Amplifiers

AGC

AFCSync

Separator

Horizontal Oscillator

Vertical Sweep

Horizontal Output

High Voltage Power supply

Low Voltage Power Supply

Speaker

Picture Tube

All Stages

AC line

Details of Vertical and Horizontal Details of Vertical and Horizontal SectionSection

Vertical Driver

Vertical Output

High Voltage rectifier

Low Voltage Power Supply

Picture Tube

All Stages

AC line

Horizontal Oscillator

Horizontal Driver

Horizontal Output Flyback

Vertical

Oscillator

Coil 2

Coil 1

Yoke

Filamentcoil

To Filament

Horizontal ScanningHorizontal Scanning• Horizontal Scanning - 15.734 Hz• Vertical Scanning – 59 Hz pulse• Interlace scanning – Function of horizontal and vertical deflection pulls the beam from left to right and the

other force pull from top to bottom. Composed of

525 lines to complete one picture called frame

1 lines = 262 lines2 lines = 525 equivalent to 1 frame

•

Composite Video Signal is Composite Video Signal is composed of the followingcomposed of the following

Video Signal –gives the right image Video Signal –gives the right image information to the picture tube. ( 30 information to the picture tube. ( 30 Hz – 4.2 MHzHz – 4.2 MHz

Horizontal Blanking pulse – tell the Horizontal Blanking pulse – tell the receiver to blank the electron beamreceiver to blank the electron beam

Horizontal synchronizing PulseHorizontal synchronizing Pulse Vertical Blanking PulseVertical Blanking Pulse Vertical synchronizing PulseVertical synchronizing Pulse Equalizing pulseEqualizing pulse