Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis C7 BEKO chassis C7

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BEKO chassis C7


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Service Manual
C7-C8 Chassis
CONTENTS                             PAGE

Safety Instructions
Technical Specifications
Special Features
Remote Control
Preperations
Operating the TV

IC Datasheets&Specs
Pin Voltages of IC's

Electrical and Service Adjustments
Channel Frequency Tables
Part List
Circuit Diagrams                     Attached




                            -2-
 1. SAFETY INSTRUCTIONS                                                                                              ^
                                                                        and each exposed metallic cabinet part on
GENERAL GUIDELINES                                                      the receiver, such as screw heads, aerials,
                                                                        connectors, control shafts etc. When the
   1. It is advised to insert an isolation transformer                  exposed metallic part a return path to the
      in the AC supply before servicing a hot                           chassis the reading should be between
      chassis.                                                          4Mohm and the 20Mohm. When the
                                                                        exposed metal does not have a return path
   2. Potentials as high as 33KV are present when                       to the chassis, the reading must be infinite.
      this receiver is in operation. Operation of the
      receiver without the rear cover involves the                 LEAKAGE CURRENT HOT CHECK
      danger of a shock hazard from the receiver
      power supply. Servicing should not be                        1. Plug the AC cord directly in to the AC
      attempted by any one who is not                                 outlet. Do not use an isolation transformer
      competent with the precautions necessary                        for this check.
      when working on the high voltage                             2. Connect a 2Kohm 10W resistor in series with
      equipment. Always discharge the anode of                        an exposed metallic part on the receiver
      the tube.                                                       and an earth, such as a water pipe.
                                                                   3. Use an AC voltmeter with high impedance
   3. When servicing observe the original lead                        to measure the potential across the resistor.
      dress in the high voltage circuits. If a short               4. Check each exposed metallic part and
      circuit is found, replace all the parts which                   check the voltage at the each point.
      have been overheated or damaged by the                       5. Reverse the AC plug at the outlet and
      short circuit.                                                  repeat each of the above measurements.
                                                                   6. The potential at the any point should not
   4. Always use the manufacturer's replacement                       exceed 1.4 Vrms. In case a measurement is
      safety components. The critical safety                          outside the limits specified, there is the
      components marked with             on the                       possibility of a shock hazard, and the
      schematics diagrams should not be                               receiver should be repaired and rechecked
      replaced by other substitutes. Other                            before it is returned to the customer.
      substitute may create the electrical shock,
      fire or other hazards. Take attention to
      replace the spacers with the originals.
      Furthermore where a short circuit has                      HOT CHECK CIRCUIT
      occurred, replace those components that                                        AC-Voltmeter

      indicate evidence of overheating.                          TO INSTRUMENTS
                                                                 EXPOSED

   5. After servicing, see that all the protective               METALLIC PARTS                         Water pipe
                                                                                                         (earth)
      devices such as insulation barriers, insulation
      papers,     shields  and     isolation     R-C
      combinations are correctly installed.                                             2 K Ohm

   6. When the receiver is not being used for a
      long time of period of time, unplug the
                                                                                  Figure 1
      power cord from the AC outlet.
                                                               X-RAY RADIATION WARNING
   7. After servicing make the following leakage
                                                               The primary source of X-ray radiation in this receiver
      current checks to prevent the customer
                                                               is the picture tube. The chassis is specially
      from being exposed to shock hazard.
                                                               constructed to limit X-ray radiation. For continued X-
                                                               ray radiation protection, replace the tube with the
   LEAKAGE CURRENT COLD CHECK
                                                               same type of the original one.
                                                               CAUTION
   1. Unplug the AC cord and connect a jumper
                                                               AFTER REMOVAL OF THE ANODE CAP, DISCHARGE
      between the two prongs of the plug.
                                                               THE ANODE OF THE PICTURE TUBE AND THE ANODE
                                                               CAP TO THE METAL CHASSIS, CRT SHIELD, OR THE
   2. Turn the receiver's power switch on.
                                                               CARBON PAINTED ON THE CRT WITH A HIGH
                                                               VOLTAGE PROBE AND MULTIMETER (SELECT VDC)
   3. Measure the resistance value with an
                                                               AND THEN SHORT CIRCUIT DIRECTLY TO DISCHARGE
      ohmmeter, between the jumpered AC plug
                                                               COMPLETELY.

                                                         -3-
    Television
    Thank you for buying this television which is designed to give you many years of
    satisfactory service.

    You may already be familiar with using a television but do please take time to read these
    instructions. They are designed to familiarise you with the unit's many new features
    and to ensure you get the very best out of your purchase.

    Special features
    



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