Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo Audio DHC-2300K daewoo+DHC-2300K_dvd

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                       DVD PLYAER
                           DHC - 2300K




SERVICE        Manual

  DVD PLAYER                CONTENTS



                1. Precautions
                2. Reference Information
                3. Product Specification
                4. Operating Instructions
                5. Disassembly and Reassembly
                6. Troubleshooting
                7. Electrical Part List
                8. Block Diagram
                9. PCB Diagrams
                10. Wiring Diagram
                11. Schematic Diagrams
1. Precautions
1-1 Safety Precautions
1) Before returning an instrument to the customer,                  and then in the OFF position, measure from a
  always make a safety check of the entire                          known earth ground (metal water pipe, conduit,
  instrument, including, but not limited to, the                    etc.) to all exposed metal parts of the
  following items:                                                  instrument (antennas, handle brackets, metal
                                                                    cabinets,   screwheads,      metallic   overlays,
(1) Be sure that no built-in protective devices are                 control shafts, etc.), especially and exposed
defective or have been defeated during servicing.                   metal parts that offer an electrical return path
   (1) Protective shields are provided to protect                   to the chassis.
   both the technician and the customer. Correctly                 Any current measured must not exceed 0.5mA.
   replace all missing protective shields, including               Reverse the instrument power cord plug in the
   any remove for servicing convenience.                           outlet and repeat the test. See Fig. 1-1.
   (2) When reinstalling the chassis and/or other                  Any measurements not within the limits
   assembly in the cabinet, be sure to put back in                 specified herein indicate a potential shock
   place all protective devices, including, but not                hazard that must be eliminated before returning
   limited to, nonmetallic control knobs, insulating               the instrument to the customer.
   fish papers, adjustment and compartment
   covers/shields, and isolation resistor/capacitor
                                                                                                                      (Reading
   networks. Do not operate this instrument or                                                                       should not
                                                                                         Test all                     be above
   permit it to be operated without all protective                                    exposed Meter                    0.5mA)
                                                                           Device        Sufaces
   devices correctly installed and functioning.                            Under
                                                                            Test

(2) Be sure that there are no cabinet openings
                                                                                2-Wire Cord
    through which adults or children might be able
    to insert their fingers and contact a hazardous                       Also test with Plug
                                                                         reserved (Using AC
    voltage. Such openings include, but are not
                                                                           adapter Plug as           Earth Ground
    limited to, excessively wide cabinet ventilation                          required)
                                                                            Fig. 1-1 AC Leakage Test
    slots, and an improperly fitted and/or incorrectly
    secured cabinet back cover.
                                                                (4) Insulation Resistance Test Cold Check-(1)
                                                                   Unplug the power supply cord and connect a
(3) Leakage     Current     Hot    Check-With         the
                                                                   jumper wire between the two prongs of the plug.
    instrument completely reassembled, plug the
                                                                   (2) Turn on the power switch of the instrument.
    AC line cord directly into a 120V AC outlet. (Do
                                                                   (3) Measure the resistance with an ohmmeter
    not use a isolation transformer during this test.)
                                                                   between the jumpered AC plug and all exposed
    Use a leakage current tester or a metering
                                                                   metallic cabinet parts on the instrument, such
    system that complies with American National
                                                                   as screwheads, antenna, control shafts, handle
    Standards institute (ANSI) C101.1 Leakage
                                                                   brackets, etc. When an exposed metallic part
                                                                   has a return path to the chassis, the reading
    Current    for   Appliances   and    Underwriters
                                                                   should be between 1 and 5.2 megohm. When
    Laboratories (UL) 1270 (40.7). With the
                                                                   there is no return path to the chassis, the
    instrument's AC switch first in the ON position
                                                                   reading must be infinite. If the reading is not
                                                            2
 Safety Precautions
(5) within the limits specified, there is the possibility         the AC power cord for damage.
    of a shock hazard, and the instrument must be
    re-pared and rechecked before it is returned to             5) Components, parts, and/or wiring that appear to
    the customer. See Fig. 1-2.                                   have overheated or that are otherwise damaged
                                                                  should be replaced with components, parts
                                                                  and/or wiring that meet original specifications.
                                                                  Additionally determine the cause of overheating
                                                                  and/or damage and, if necessary, take corrective
  Antenna
  Terminal                                                        action to remove and potential safety hazard.


 Exposed                                                        6) Product    Safety   Notice-Some    electrical    and
 Metal Part
                                                                  mechanical parts have special safety-related
                                 ohm
                                          ohmmeter
                                                                  characteristics which are often not evident from
         Fig. 1-2 Insulation Resistance Test                      evisual inspection, nor can the protection they
                                                                  give necessarily be obtained by replacing them
2) Read and comply with all caution and safety                    with components rated for higher voltage,
   related notes non or inside the cabinet, or on the             wattage, etc. Parts that have special safety
   chassis.                                                       characteristics are identified by shading, an (     )
                                                                  or a (     ) on schematics and parts lists. Use of a
3) Design Alteration Warning-Do not alter of add to               substitute replacement that does not have the
   the mechanical or electrical design of this                    same safety characteristics as the recommended
   instrument. Design alterations and additions,                  replacement part might created shock, fire
   including but not limited to, circuit modifications            and/or other hazards. Product safety is under
   and the addition of items such as auxiliary audio              review continuously and new instructions are
   output connections, might alter the safety                     issued whenever appropriate.
   characteristics of this instrument and create a
   hazard to the user. Any design alterations or
   additions will make you, the service, responsible
   for personal injury or property damage resulting
   there from.


4) Observe original lead dress. Take extra care to
   assure correct lead dress in the following areas:
   (1) near sharp edges, (2) near thermally hot
   parts (be sure that leads and components do not
   touch thermally hot parts), (3) the AC supply, (4)
   high voltage, and (5) antenna wiring. Always
   inspect in all areas for pinched, out-of-place, or
   frayed wiring, Do not change spacing between a
   component and the printed-circuit board. Check


                                                            3
 1-2 Servicing Precautions

CAUTION :        Before servicing Instruments covered       (3) The components used in the unit have a
by this service manual and its supplements, read               specified flame resistance and dielectric
and follow the Safety Precautions section of this              strength.
manual.                                                        When replacing components, use components
                                                               which have the same ratings. Components I-
Note :      If unforeseen circument create conflict            enti-fied by shading, by (   ) or by (   ) in the
between the following servicing precautions and                circuit diagram are important for safety or for the
any of the safety precautions, always follow the               characteristics of the unit. Always replace them
safety precautions. Remember: Safety First.                    with the exact replacement components.


1-2-1 General Servicing Precautions                         (4) An insulation tube or tape is sometimes used
                                                                and some components are raised above the
(1) a. Always unplug the instrument's AC power                  printed wiring board for safety. The internal
     cord from the AC power source before (1) re-               wiring is sometimes clamped to prevent contact
     moving or reinstalling any component, circuit              with heating components. Install such elements
     board, module or any other instrument                      as they were.
     assembly, (2) disconnecting any instrument
     electrical plug or other electrical connection,        (5) After servicing, always check that the removed
    (3) connecting a test substitute in parallel with           screws, components, and wiring have been
    an electrolytic capacitor in the instrument.                installed correctly and that the portion around
  b. Do not defeat any plug/socket B+ voltage                   the serviced part has not been damaged and so
    interlocks with which instruments covered by                on. Further, check the insulation between the
    this service manual might be equipped.                      blades of the attachment plug and accessible
  c. Do not apply AC power to this instrument                   conductive parts.
    and/or any of its electrical assemblies unless
    all solid-state device heat sinks are correctly         1-2-2 Insulation Checking Procedure
    installed.
  d. Always connect a test instrument's ground              Disconnect the attachment plug from the AC outlet
    lead to the instrument chassis ground before            and turn the power ON. Connect the insulation
    connecting the test instrument positive lead.           resistance meter (500V) to the blades of the
    Always remove the test instrument ground lead           attachment plug. The insulation resistance between
    last.                                                   each blade of the attachment plug and accessible
                                                            conductive parts(see note) should be more than 1
Note : Refer to the Safety Precautions section              Megohm.
ground lead last.
                                                            Note : Accessible conductive parts include metal
(2) The service precautions are indicated or printed        panels, input terminals, earphone jacks, etc.
   on the cabinet, chassis or components. When
   servicing, follow the printed or indicated service
   precautions and service materials.

                                                        4
1-3 ESD Precautions

Electrostatically Sensitive Devices (ESD)                    its protective package until immediately before you
                                                                   are ready to install it. (Most replacement ESD
Some semiconductor (solid state) devices can be                    devices are packaged with leads electrically
damaged easily by static electricity.                              shorted together by conductive foam, aluminum
Such     components        commonly      are    called             foil or comparable conductive materials).
Electrostatically Sensitive Devices(ESD). Examples
of typical ESD devices are integrated circuits and           (7) Immediately before removing the protective
some field-effect transistors and semiconductor                     materials from the leads of a replacement ESD
chip components. The following techniques should                    device touch the protective material to the
be used to help reduce the incidence of component                   chassis or circuit assembly into which the
damage caused by static electricity.                                device will be installed.


(1) Immediately before handling any semiconductor            CAUTION : Be sure no power is applied to the
   components         or    semiconductor-equipped           chassis or circuit, and observe all other safety
   assembly, drain off any electrostatic charge on           precautions.
   your body by touching a known earth ground.
   Alternatively, obtain and wear a commercially             (8)     Minimize    bodily   motions   when   handling
   available discharging wrist strap device, which                  unpackaged      replacement     ESD        devices.
   should be removed for potential shock reasons                    (Otherwise harmless motion such as the
   prior to applying power to the unit under test.                  brushing together of your clothes fabric or the
                                                                    lifting of your foot from a carpeted floor can
(2) After removing an electrical assembly equipped                  generate static electricity sufficient to damage
   with ESD devices, place the assembly on a                        an ESD device).
   conductive surface such as aluminum foil, to
   prevent electrostatic charge buildup or exposure
   of the assembly.


(3) Use only a grounded-tip soldering iron to solder
   or unsolder ESD device.


(4) Use only an anti-static solder removal devices.
   Some solder removal devices not classified as
   "anti-static" can generate electrical charges
   sufficient to damage ESD devices.


(5) Do not use freon-propelled chemicals. These
   can generate electrical charges sufficient to
   damage ESD devices.


(6) Do not remove a replacement ESD device from

                                                         5
 2. Reference Information
 2-1 Component Descriptions


 2-1-1 DVD ATAPI LOADER (DSL-710A)




 * D.C. Power Supply
           A 4-pin shrouded, keyed male connector is used to provide the D.C. Power.
           The pin assignment is described below.


                   PIN          DC VOLTS
                    1             +12V
                    2             GND
                    3             GND
                    4              +5V


                     Figure-1    D.C. Power Connector


   * Interface Connector
           A 39-pin male, unshielded, shrouded, keyed connector are applied.
           Please refer to Section 7-2-3 regarding its pin definition.


                     39                                                             1
                     40                                                             2
                                        Interface Connector


* Electrical Charateristics
          1. Power


          1-1. Voltage
              +5V DC with 



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