WORKING PRINCIP OF RECEIVER TELEVISION
REPAIRING RECEIVER TELEVISION SYSTEMBy Sarbini, S.Pd SMK Muh 3 Yogyakarta
Teknologi dan Rekayasa
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
Teknologi dan Rekayasa
TELEVISION MACHINE
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