VESTEL SAT 507D Service Manual
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VESTEL SAT 507D Service Manual

VESTEL SAT 507D Service Manual

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SAT 507D
SERVICE MANUAL
1999

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Summary of Contents for VESTEL SAT 507D

  • Page 1 SAT 507D SERVICE MANUAL 1999...
  • Page 2 DO NOT CHANGE ANY MODULE UNLESS THE SET IS PLUGGED OFF. SAT-507D operates between 85 with 265VAC main supply and this voltage level has THE RISK OF ELECTRICAL SHOCK. Safety precautions Servicing of this satellite receiver should only be carried out by a qualified person. •...
  • Page 3 1. INTRODUCTION: SAT-507D satellite receiver is designed to work for years under proper conditions without any maintenance and produced with quality control assurance. SAT-507D is a basic model satellite receiver. The technical information of the receiver will be explained in the following pages.
  • Page 4 STV0042Aoffers two audio de-emphasis 75ms and 50ms. Adynamic noise reduction system (ANRS) is integrated into the STV0042A using a low pass filter, the cut-off frequency of which is controlled by the amplitude of the audio after insertion of a band- pass filter.

  • Page 5: Table Of Contents

    IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAMS IC NAME PAGE NO • 87C52 ..................6 • STV0042 ................... 9 • LC74763..................12 • 24C32 ..................15 • LM358..................17 • ................... 19 CQY80NG • TOP223Y…………………………………………………………………21...

  • Page 6: 87C52

    80C52 MICROCONTROLLER GENERAL DESCRIPTION: The 80C52 is a general purpose microcontroller. It is intended for use as the central control mechanism in this satellite receiver. The 80C52 is a member of the 80C51 microcontroller family. FEATURES: • Power control modes •...
  • Page 7 23. P2.2/A10 7 Segment Display Driver 24. P2.3/A11 7 Segment Display Driver 25. P2.4/A12 7 Segment Display Driver/Keypad Input 26. P2.5/A13 7 Segment Display Driver/Keypad Input 27. P2.6/A14 7 Segment Display Driver/Keypad Input 28. P2.7/A15 Keypad Output 29. PSEN 30. ALE 31.
  • Page 8 BLOCK DIAGRAM...

  • Page 9: Stv0042

    STV0042A SATELLITE SOUND AND VIDEO PROCESSOR GENERAL DESCRIPTION: The STV0042A BICMOS integrated circuit realizes all the necessary signal processing from the tuner to the Audio/Video input and output connectors regardless the satellite system. The STV0042A is intended for low cost satellite receiver application. FEATURES: SOUND •...
  • Page 10 PINNING...
  • Page 11 BLOCK DIAGRAM...

  • Page 12: Lc74763

    LC74763 ON SCREEN DISPLAY IC GENERAL DESCRIPTION: The LC74763 is an on-screen display CMOS LSI that superimpose text and low- levelgraphics onto a TV screen (video signal) under the control of a microcontroller. The display characters have a 12 by 18 dots structure, and 128 characters are provided. FEATURES: •...
  • Page 13 PINNING: Note: pin 29 is used as general I/O for LNB input switching.
  • Page 14 BLOCK DIAGRAM...

  • Page 15: 24C32

    24C32 32KBit 5.0V CMOS SERIAL EEPROM GENERAL DESCRIPTION: 24C32 is a 4K x 8 (32Kbit) Serial Electrically Erasable PROM. This device has been developed for advanced, low power applications such as personal communications or data acquisition. The 24C32 features an input cache for fast write loads with a capacity of eight 8-byte pages, 64 bytes.
  • Page 16 BLOCK DIAGRAM MICROCHIP ATMEL...

  • Page 17: Lm358

    LM358 LOW POWER DUAL OPERATIONAL AMPLIFIER GENERAL DESCRIPTION: These circuits consist of two independent, high gain, internally frequency compensated which were designed specifically to operate from a single power supply over a wide range of voltages. The low power supply drain is independent of the magnitude of the power supply voltage.
  • Page 18 BLOCK DIAGRAM:...

  • Page 19: Cqy80Ng

    CQY80NG OPTOCOUPLER WITH PHOTOTRANSISTOR OUTPUT GENERAL DESCRIPTION: The CQY80N(G) series consist of a phototransistor optically coupled to a gallium arsenide infrared-emitting diode in a 6-lead plastic dual inline package. The elements are mounted on one leadframe using a coplanar technique, providing a fixed distance between input and output for highest safety requirements.

  • Page 20: Top223Y

    TOP223Y Three-terminal Off-line PWM Switch FUNCTIONAL DESCRIPTION: TOPSwitch is a self biased and protected linear control current-to-duty cycle converter with an open drain output. High efficiency is achieved through the use of CMOS and integration of the maximum number of functions possible. CMOS process significantly reduces bias currents as compared to bipolar or discrete solutions.
  • Page 21 PIN FUNCTIONAL DESCRIPTION DRAIN Pin: Output MOSFET drain connection. Provides internal bias current during start-up operation via an internal switched high-voltage current source. Internal current sense point. CONTROL Pin: Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation.

  • Page 22: Trouble Shooting

    TROUBLE SHOOTING • ANY TROUBLE : CHECK ALL RELEVANT VOLTAGES • ANY VOLTAGE ERROR : FUSE, IC03, SMT(TRANSFORMER),POWERCORD • +5V : PIN7 OF SMPS01, IC06, IC08, D09 • +12V : PIN8 OF SMPS01, D08, CHECK +5V AGAIN. • NO LNB SUPPLY : PIN9 OF SMPS01, D06, CHECK LNB SHORT CIRCUIT, Q56, D36, Q09, IC02 •...

  • Page 23: Technical Specifications

    TECHNICAL SPECIFICATIONS SATELLITE TUNER Input frequency : 920-2150 MHz Input Impedance : 75 Ohm Input Level : -65dBm -30dBm IF-Frequency : 479.5 MHz IF-Bandwidth : 27 MHz nominal Gain Control : AGC Tuning : PLL LNB Power: 400mA max. AUDIO Frequency Band : 5.00-9.00 MHz Mode...

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Sat 507c

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