Television 1 Jess UEAB2006 AFT and remote control Circuits.

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Presentation transcript:

Television 1 Jess UEAB2006 AFT and remote control Circuits

Television 1 Jess UEAB2006 Importance of AFC  Receivers that have provisions for remote tinning have no provision for remote fine tuning  Color receivers that have provisions for remote tuning to obtain the best color reproduction  Many customers found it difficult to adjust the manual fine tuning control property  A very slight drift in the frequency of the tuner oscillator causes a loss of color picture quality

Television 1 Jess UEAB2006 AFT Section

Television 1 Jess UEAB2006 Troubleshooting AFT circuits  Weak or no AFT performance  No picture no sound raster ok  Large tuning error  Moment to moment picture variations

Television 1 Jess UEAB2006 Ultrasound remote control

Television 1 Jess UEAB2006 Causes of AFT problems  A defective transistor or associated circuits  A defective transformer  defective IC or associated circuits such as an open coil  Misalignment of the AFT tuned circuits  Incorrect power supply voltage  Defective varactor  Incorect varactor voltage

Television 1 Jess UEAB2006 AFT circuit that uses dc amplifier to drive the varactor

Television 1 Jess UEAB2006 Large tuning error on channels that originates form the varactor  DC amplifier balance change caused by the change in resistor anywhere in the DC amplifier  Defective varactor

Television 1 Jess UEAB2006 Remote control Capability  Change channel  Adjust volume  Adjust picture  Adjust contrast  Adjust sharpness  Sound quality adjustment  Power switch

Television 1 Jess UEAB2006 Remote controls  Ultrasonic Transmitter –Acoustic transmitter –Function by tune signals from receiver to transmitter

Television 1 Jess UEAB2006 Ultrasound remote control

Television 1 Jess UEAB2006 Kinds of remote control faults  Weak intensive response on all function  Dead all function  Dead on some function but not all

Television 1 Jess UEAB2006 Electronic memory remote control  Producing ultrasonic sound through electronic circuit controlled system.

Television 1 Jess UEAB2006 Three tone remote control

Television 1 Jess UEAB2006 Infrared system  Using invisible infrared signal  Digitally modulated infrared signal 42 KHz sensed by infrared diodes.

Television 1 Jess UEAB2006 Infrared remote control

Television 1 Jess UEAB2006

AFT discriminator circuit

Television 1 Jess UEAB2006 AFT Circuit

Television 1 Jess UEAB2006

Receiver

Transmitter

Multifunction Remote Control