WORKING PRINCIP OF RECEIVER TELEVISION

REPAIRING RECEIVER TELEVISION SYSTEMBy Sarbini, S.Pd SMK Muh 3 Yogyakarta

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THE MEANING TELEVISION

Tele : far

Vision : see/view

Television : see from far distance

Television : Electronic instrument that can be broadcast / show an object from a far distance

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SUB SYSTEM TELEVISION

TRANSMITTER : Transmit video signal with the modulation signal (carrier)

RECEIVER : Receive video signals and conver to video and sound

CONDUCTION MEDIA (AIR,CABEL) : Conduction elektromagnetik waves from transmitter to the television receiver

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THE WORKING PRINCIPLES

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RECEIVER TELEVISION BLACK WHITE BLOCKS

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RECEIVER TELEVISION COLOUR BLOCKS

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DETAIL RECEIVER TELEVISION COLOUR BLOCKS

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1. TUNER / PENALA

Penala : receive input sinyal (TV wave) from antena and convert to frecuency IF sinyal.

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PART OF TUNER

RF Amplifier : amplifi sinyal that receive antena

Lokal Osilator :generating sinyal high frekuency that value higher comparated RF frekuency RF from antena (FO= frekuency RF+IF).

Mixer :Mixing sinyal from RF amplifier and osilator local until produced IF frekuency (IF video PAL=38,9MHz, IF Sound = 33,4 MHz) dan NTSC= 42,75 MHz)

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2. AUDIO PROCESSING

FUNCTION

Separated information sinyal (audio) from signal audio carrier and amplifiying until can listening by audience.

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AUDIO PROCESSING PARTS

Sound IF (IF Suara) amplifier : amplifying audio signal that demodulated wave FM (5,5 MHz).

Detector FM (Frequency Modulation) : separate audio frekuency from carrier that modulated FM.

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Power Amplifier (Sound Output) : Amplifying audio signal until be able vibrate loudspeaker.

Loudspeaker : convert audio signal audio to sound.

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3. PROCESSING VIDEO SIGNAL

Amplifier IF (Intermediate Frequency)

Video Detektor

Video Amplifier

AGC (Automatic Gain Control)

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VIDEO AMPLIFIER BLOCK

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WORKING PRINCIPPLES OF AGC

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AGC TYPE

AGC AVERAGE

PICK LEVEL AGC

KEYED AGC

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4. SYNCRONIZATION AND DEFLEKTION

Synkronization Horisontal Deflection

Horisontal Osilator : generate pulse horisontal frekuency (system CCIR 15.625 Hz,FCC 16.750Hz).

Horisontal Driver : Amplifying Signal horisontal frekuensi from osilator so be able suplies enought electric current for push horisontal output transistor (HOT).

Horisontal Output (HOT) : provide power electric sawtooth (arus gigi gergaj) for forward to horisontal deflektion yoke.

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High Voltage Generate Produce high voltage for activate CRT until be able to produce electrons for video display.

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Horizontal Deflection Yoke

Produce enough electric current for scaning electric beam horizontal direction.

Generate high voltage pass sekunder fly back transformator, for forward to electrode anoda CRT and elektroda fokus.

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Defleksi vertikal Part1.vertikal Osilator : generate vertikal

frekuency (50 HZ)

2.Driver Osilator : Amplifying signal from osilator so can provide electric current enough for push vertikal output transistor.

3.Output Osilator : amplifying signal from Vertikal driver for forwarded to deflection vertikal yoke.

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5. Power Supply

Power Supply : convert AC voltage to DC voltage for distributed to all part that need.

2 system power supply:

1. Konvensional System

2. Switching System

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TELEVISION MACHINE