Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo TV 2594ST 2594ST-CP775

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2594ST-CP775


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Service Manual
 59 Cm STEREO Colour Television
              CHASSIS : CP-775


                 MODEL :2594ST
  Specifications

CRT                 25" : A59EAK071X11 (PHILIPS)


System              TF : PAL - B/G for West Europe, NTSC-3.58 / 4.43 (Play back)




Main Voltage        230V AC, 50Hz
Power Consumption   Stand-by mode : 10 Watts
                    Normal operating mode : 25" = 75 Watts


Sound output        5 + 5 Watts, 10 % THD at RF 60 % mod. (1 )
Speaker             12W 4 ohm x 2 EA
Antenna             75 ohm unbalanced input
Impedance
Tuning system       VS( voltage synthesis ) tuning
Tuner               3303KHC (TF, TA, TK, TI Model)
                                  BAND I       : CH2 - CH4
                                  BAND III     : CH5 - CH12
                                  CABLE BAND : S1' - S3' , S1 - S20
                                  HYPER BAND : S21 - S41
                                  BAND IV, V : CH21 - CH69
                    DT2-IV17D (TU Model )
                                  BAND IV, V : CH21 - CH69
Number of           70 programs
program
Aux. Terminal       21 pin EURO-SCART jack ( AV input, TV output, RGB input )
                    21 pin EURO-SCART jack ( AV input, S-VHS input )
                    RCA type AV input jack
                    Headphone jack (3.5 mm )
Remote controller   R-28B03 or R-35D05 with 2 "AA" type batteries
Teletext            8 pages memory TOP & FLOF
                    - West option :English, German/Dutch/Flemish, French, Italian,
                         Spanish/Portuguese, Swedish/Finnish/Danish, Czech/Slovak
                    - East option : Polish, Czech/Slovak, Rumanian, Hungarian, Servo-croat,
                         German/Dutch/Flemish, French, Italian
                    - Turkish option : Turkish, English, German/Dutch/Flemish, French,
                         Italian, Spanish/Portuguese, Swedish/Finnish/Danish
                    - Cyrillic option: Russian, Lettish/Lithuanian, Estonian, Ukranian,
                         Czech/Slovak, Servo-croat, English
OSD language        -East,West,Turkish Version : English,French,German,Italian,Spanish
                    -Cyrillic Version : Russian, English, German



                                                      2
 21 PIN EURO-SCART

PIN   Signal Designation                                             Matching Value
 1    Audio Out(linked with 3)                                       0.5Vrms,lmp<1 (RF 60% MOD)
 2    Audio In(linked with 6)                                        0.5Vrms,lmp>10
 3    Audio Out(linked with 1)                                       0.5Vrms,lmp<1 (RF 60% MOD)
 4    Audio Earth
 5    Blue Earth
 6    Audio in (linked with 2)                                       0.5Vrms,lmp>10
 7    Blue in                                                        0.7Vpp 3 ,lmp75
 8    Slow(Function) Switching                                       TV:0-2V,PERI:9.5-12V,lmp>10
 9    Green Earth
10    NC
11    Green In                                                       0.7Vpp 3 ,lmp75
12    NC
13    Red Earth
14    NC
15    Red In, C In                                                   0.7Vpp 3 ,lmp75
16    Rapid(Blanking) switching                                      Logic 0:0-0.4V,Logic 1:1-3V,Imp 75
17    Video Earth
18    Rapid Blanking Earth
19    Video Out                                                      1Vpp             3 ,lmp75
20    Video In, Y In                                                 1Vpp             3 ,lmp75
21    Common Earth




                       20        18        16        14        12        10       8       6       4       2


                  21        19        17        15        13        11        9       7       5       3       1




                                                                                  3
    Safety Instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair of
this equipment.


  X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially           2. The only source of X-RAY Radiation in this TV
   hazardous X-RAY RADIATION.To avoid such                     receiver is the picture tube.For continued X-RAY
   hazards, the high voltage must not exceed the               RADIATION protection,the replacement tube
   specified limit. The nominal value of the high              must be exactly the same type tube as specified
   voltage of this receiver is 26      at max beam             in the parts list.
   current. The high voltage must not, under any
   circumstances, exceed 29.5 (25"), 30 (28").
   Each time a receiver requires servicing, the high
   voltage should be checked. It is important to use
   an accurate and reliable high voltage meter.




  SAFETY PRECAUTION
1. Potentials of high voltage are present when this         2. If any Fuse in this TV receiver is blown, replace it
   receiver is operating. Operation of the receiver            with the FUSE specified in the Replacement
   outside the cabinet or with the back board                  Parts List.
   removed involves a shock hazard from the                 3. When replacing a high wattage resistor(oxide
   receiver.                                                   metal film resistor)in circuit board, keep the
  1) Servicing should not be attempted by anyone               resistor 10mm away from circuit board.
     who is not thoroughly familiar with the                4. Keep wires away from high voltage or high
     precautions necessary when working on high-               temperature components.
     voltage equipment.                                     5. This receiver must operate under AC230 volts,
  2) Discharge the high potential of the picture tube          50Hz. NEVER connect to DC supply or any other
     before handling the tube. The picture tube is             power or frequency.
     highly evacuated and if broken, glass
     fragments will be violently expelled.




  PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this have           identified by designated symbol on the parts list.
special safety-related characteristics. These               Before replacing any of these components, read the
characteristics are often passed unnoticed by a             parts list in this manual carefully. The use of
visual inspection and the X-RAY RADIATION                   substitute replacement parts which do not have the
protection afforded by them cannot necessarily be           same safety characteristics as specified in the parts
obtained by using replacement components rated              list may create X-RAY Radiation.
for higher voltage,wattage,etc. Replacement parts
which have these special safety characteristics are
identified in this manual and its supplements,
electrical components having such features are




                                                        4
     SIF ADJUSTMENT
1. APPARATUS CONNECTION & PRESETTING
   * CONNECTION                                                             * PRESET
   1) Connect H-out of LSW-480 to X-axis of the                             1) Oscilloscope Scaling
      oscilloscope and V-out of LSW-480 to Y-axis                             a) Put the scale of X and Y of the oscilloscope
      of the oscilloscope.                                                       to D.C. level
   2) Connect the sweep signal output to TP1.                                 b) Set the horizontal time display to X-Y.
   3) Set ATTENUATOR of LSW-480 to 20dB.                                     c) Put the horizontal axis (x) to 1V / div. and the
   4) Supply 12V D.C. voltage(B+) to TP3.                                        vertical axis (Y) to 2V / div.
   5) Supply 3V D.C. voltage(B+) to TP4.                                    2) LSW-480 MARKER FREQ. SETTING
   6) Connect the test point of LSW-480 to TP2.
                                                                                fp(n+1)    fs       fc     fp-2    fp    fs(n-1)
   7) Adjust L109(AFT COIL) so that the P marker
                                                                                 31.9     33.4     34.47   36.9   38.9    40.4
      point is located on the reference level.




                              PIF SWEEP MAKER (LSW-480)                             OSCILLOSCOPE

                             GENERATOR
                                              H-OUTPUT                              X
                                              V-OUTPUT                              Y
                             OUTPUT
                                               FROM TP




                             TP1 (TUNER IF)          TP2 (I603 #12)

                             TP3 (TUNER B+)          TP3 (I603 #3)




                             DC POWER SUPPLY              DC POWER SUPPLY
                                  (+12V)                       (+3V)




                                                - Connection For SIF Adjustment -




                                                                        Y


                                                                                                    X
                                                                            P
                                                                            (38.9 MHZ)




                                                                12
     IC Description

DW5255S*(Micro-controller & West/East Teletext Decoder)
(1) General Description
    The TDA5255 contains a slicer for VPS and TTX, an accelerating acquisition hardware module, a display
    generator for "LEVEL 1" TTX data and a 8 bit u-controller running at 333 nsec cycle time.
    The controller with dedicated hardware guarantees flexibility, does most of the internal processing of TTX
    acquisition , transfers data to/from the external memory interface and receives/transmits data via I2C and
    UART user interfaces.
    The Slicer combined with dedicated hardware stores TTX data in a VBI 1Kbyte buffer.
    The u-controller firmware does the total acquisition task ( hamming- and parity -checks,
    page search and evaluation of header control bits) once per field.

(2) Feature
   



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