Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis 12.3 BEKO chassis 12.3 01

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BEKO chassis 12.3 01


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123-STEREO/SM
                               R




  Service Manual - 123-STEREO/SM
CONTENTS                             PAGE

Safety Instructions                    1
Technical Specifications               2
Block Diagram                          3
Pin Voltages of IC's                   4
Oscillograms                           8
Electrical and Service Adjustments    12
Part List                             15
Circuit Diagrams                Attached
SAFETY INSTRUCTIONS

GENERAL GUIDELINES                                                connectors, control shafts etc. When the
                                                                  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
      chassis.                                                    exposed 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
      danger of a shock hazard from the receiver             1. Plug the AC cord directly in to the AC
      power supply. Servicing should not be                     outlet. Do not use an isolation transformer
      attempted by any one who is not                           for this check.
      competent with the precautions necessary               2. Connect a 2Kohm 10W resistor in series with
      when working on the high voltage                          an exposed metallic part on the receiver
      equipment. Always discharge the anode of                  and an earth, such as a water pipe.
      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
      have been overheated or damaged by the                    repeat 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
      components      marked with        on the                 receiver should be repaired and rechecked
      schematics diagrams should not be                         before it is returned to the customer.
      replaced by other substitutes. Other
      substitute may create the electrical shock,
      fire or other hazards. Take attention to
      replace the spacers with the originals.              HOT CHECK CIRCUIT
      Furthermore where a short circuit has                                    AC-Voltmeter

      occurred, replace those components that              TO INSTRUMENTS
      indicate evidence of 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
                                                         constructed to limit X-ray radiation. For continued
      from being exposed to shock hazard.
                                                         X-ray radiation protection, replace the tube with
                                                         the same type of the original one.
   LEAKAGE CURRENT COLD CHECK
                                                         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.
      and each exposed metallic cabinet part on
      the receiver, such as screw heads, aerials,
                                     TECHNICAL SPECIFICATIONS

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

Power consumption (max.) :          95 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 SECAM BG LL'
                                    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 x 7W RMS at %10 THD

High Voltage :                      25 



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