Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis E1 BEKO chassis E1 01

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BEKO chassis E1 01


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Service Manual
E1 CHASSIS
CONTENTS                             PAGE

o   Safety Instructions                     2
o   Technical Specifications                3
o   Remote Control                          4
o   Preperations                            5
o   Operating Your TV                       6
o   Block Diagram                           10
o   IC Specs                                11
o   Pin Voltages of IC's                    18
o   OSCILLOSGRAPHS OF SOME IC PINS          19
o   Electrical Adjustments                  22
o   Channel Frequency Tables                25
o   Spare Part List                         27




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

                                                               TO INSTRUMENTS
   5. After servicing, see that all the protective             EXPOSED

      devices such as insulation barriers, insulation          METALLIC PARTS                        Water pipe
                                                                                                      (earth)
      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
      power cord from the AC outlet.
                                                                                Figure 1
   7. After servicing make the following leakage
                                                             X-RAY RADIATION WARNING
      current checks to prevent the customer from
                                                             The primary source of X-ray radiation in this receiver
      being exposed to shock hazard.
                                                             is the picture tube. The chassis is specially
   LEAKAGE CURRENT COLD CHECK
                                                             constructed to limit X-ray radiation. For continued X-
   1. Unplug the AC cord and connect a jumper
                                                             ray radiation protection, replace the tube with the
      between the two prongs of the plug.
                                                             same type of the original one.
   2. Turn the receiver's power switch on.
                                                             CAUTION
                                                             AFTER REMOVAL OF THE ANODE CAP, DISCHARGE THE
   3. Measure the resistance value with an
                                                             ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO
      ohmmeter, between the jumpered AC plug
                                                             THE METAL CHASSIS, CRT SHIELD, OR THE CARBON
      and each exposed metallic cabinet part on
                                                             PAINTED ON THE CRT WITH A HIGH VOLTAGE PROBE


                                                         2
AND MULTIMETER (SELECT VDC) AND THEN SHORT                      CIRCUIT DIRECTLY TO DISCHARGE COMPLETELY
 2. TECHNICAL SPECIFICATIONS                                                                               .

Power source:                       220-240V AC, 50-60Hz

Power consumption (nom.) :          40 W                 14"
                                    50 W                 20", 21"

Standby power consumption :         4W

Aerial impedance :                  75Ohm, coaxial type

Receiving system 1:                 PAL BG
                                    PAL SECAM BG
                                    PAL SECAM BG DK
                                    PAL I

Receiving channels:                 VHF BAND I       CH2-4
                                    VHF BAND III     CH5-12
                                    CABLE TV         S1-41
                                    UHF BAND         CH21-69

Audio outputs :                     2.0W RMS at %10 THD         14"
                                    2.5W RMS at %10 THD         20", 21"

High Voltage :                      23 



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