Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis K5 BEKO chassis K5

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BEKO chassis K5


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Service Manual
K5 CHASSIS-DVD COMBO TV
CONTENTS                             PAGE

o   Safety Instructions                     2
o   Technical Specifications                3
o   Remote Control                          4
o   Preparations                            7
o   Operating Your TV                       8
o   Block Diagram                           21
o   IC Datasheets&Specs                     22
o   Pin Voltages of IC's                    29
o   Oscillosgraphs Of Some IC Pins          31
o   Electrical Adjustments                  35
o   Channel Frequency Tables                38
o   Spare Part List                         41




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

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

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


                                                         2
  2.       TECHNICAL SPECIFICATIONS                                                                .

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

Power consumption (nom.) :          73W              20", 21"

Standby power consumption :         2W

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 :                     7W RMS at %10 THD           21"

High Voltage :                      25 



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