Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo TV CP-775 CP-775

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CP-775


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Service Manual
 59 / 66 Cm STEREO Colour Television
               CHASSIS : CP-775


                  MODEL :2594ST / 2896ST
                         2898ST / 28G2ST
                         25G1ST / 29G1ST
  Specifications

CRT                 25" : A59EAK071X11 (PHILIPS)
                    28" : A66EAK071X11 (PHILIPS)
System              TF : PAL - B/G for West Europe, NTSC-3.58 / 4.43 (Play back)
                    TA : PAL - B/G, SECAM-L/L' for France, NTSC-3.58 / 4.43 (Play back)
                    TU : PAL- I for U.K, NTSC-3.58 / 4.43 (Play back)
                    TK : PAL/SECAM - B/G, D/K, NTSC-3.58/4.43(play back) for East Europe & CIS
Main Voltage        230V AC, 50Hz
Power Consumption   Stand-by mode : 10 Watts
                    Normal operating mode : 25" = 75 Watts
                                                28" = 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



                                                      1
 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




                                                                                  2
    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




                                                        3
     Alignment Instructions

1. AFT

1.1 Standard B/G,D/K,I and L
 1) Set a Signal Generator with
    - RF FREQUENCY = 38.9 MHz,
    - RF OUTPUT LEVEL = 80 5 dBuV
    - System = PAL / SECAM - B/G, D/K, I
 2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).
    There must be no signal input to the tuner.
 3) Press the "AFT" KEY and wait until the TV screen display "AFT OK".

1.2 Standard SECAM-L' (France VHF-Low)
    Above mentioned "1.1" adjustment has to be done in advance.
 1) Set a Signal Generator with
    - RF FREQUENCY = 34.5 MHz,
    - RF OUTPUT LEVEL = 80 5 dBuV
    - System = SECAM - L'
 2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).
    There must be no signal input to the tuner.
 3) Press the "L' AFT" KEY and wait until the TV screen display "L AFT OK".

2. AGC
  1) Set a Pattern Generator with RF LEVEL 63 2 dBuV .
  2) Connect a OSCILLOSCOPE PROBE to P101 (TUNER AGC INPUT).
  3) Adjust AGC UP/DOWN KEY the voltage drop 1V dc over below its maximum voltage.

  Alternative Method
 1) Set a Pattern Generator with
  - RF LEVEL 80 5 dBuV
  - PAL CROSSHATCH
   ( without SOUND CARRIER )
 2) Connect a OSCILLOSCOPE
   ( Bandwidth     100MHz ) PROBE
    to P101 (TUNER IF OUTPUT).
 3) Use AGC UP/DOWN KEY to obtain
    an envelop amplitude 200 + 50 mVp-p.

3. SCREEN
  1) Apply a COLOR BAR pattern signal.
  2) Set the CONTRAST, BRIGHTNESS                                                          Black level
     to MAX, COLOR to MIN.
  3) Set the R,G,B LEVEL to CENTER (31/63)                                           140 5Vdc
     with R,G,B UP/DOWN KEY.
  4) Connect a OSCILLOSCOPE PROBE
     to P906 ( CRT CATHOD R, G, B ).
  5) Adjust the SCREEN VOLUME on FBT
     such that the highest black level voltage                                                     GND
     140 5Vdc.




                                                        5
4. WHITE BALANCE
 1) Set the TV to NOR I mode.
 2) Set the R,G,B LEVEL to CENTER with R,G,B UP/DOWN KEY .
 3) Adjust the R,G,B UP/DOWN KEY of the other color which did not appear
    on the screen to obtain WHITE.

5. FOCUS
  1) Apply a RETMA PATTERN signal.
  2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

6. GEOMETRY

 6.1 VERTICAL CENTER
   1) Set the TV to NOR I mode.
   2) Pressing the V-SIZE UP/DOWN KEY, the
      lower half of the screen is blanked.
   3) Adjust the border line of blanked picture
      coincident with the mechanical center marks
      of the CRT using the V-SIZE UP/DOWN KEY.


 6.2 VERTICAL SIZE
     The VERTICAL CENTER adjustment
     has to be done in advance.
   1) Apply a RETMA PATTERN signal.
   2) Set the TV to NOR I mode.
   3) Adjust the upper part of the picture
      with the V-SIZE UP/DOWN keys.


 6.3 VERTICAL SLOPE
     The VERTICAL SIZE adjustment
     has to be done in advance.
   1) Apply a RETMA PATTERN signal.
   2) Adjust the lower part of the picture
      with the V-SLOPE UP/DOWN keys.


 6.4 VERTICAL S-CORRECTION
   1) Apply a CROSSHATCH PATTERN signal.
   2) Adjust the S-COR UP/DOWN KEY to obtain
      the same distance between horizontal lines.


 6.5 HORIZONTAL CENTER
   1) Apply a RETMA PATTERN signal.
   2) Adjust picture centering with CENTER
      LEFT/RIGHT keys.




                                                      6
7. EW

 7.1 WIDTH
   1) Apply a RETMA PATTERN signal.
   2) Pressing the EW KEY, the WIDTH OSD appear in the screen.
   3) Adjust the over to make a perfect circle with VOL-UP/DOWN KEY.




 7.2 PARA
   1) Apply a CROSSHATCH PATTERN signal.
   2) Pressing the EW KEY, the PARA OSD appear in the screen.
   3) Adjust the vertical line to straight with VOL-UP/DOWN KEY.




 7.3 CORNER
   1) Apply a CROSSHATCH PATTERN signal.
   2) Pressing the EW KEY, the CORNER OSD appear in the screen.
   3) Adjust the vertical line to straight with VOL-UP/DOWN KEY.




 7.4 TRAPI
   1) Apply a CROSSHATCH PATTERN signal.
   2) Pressing the EW KEY, the TRAPI OSD appear in the screen.
   3) Adjust the vertical line to straight with VOL-UP/DOWN KEY.




                                                       7
If EEPROM (I702) has been changed ;
    - Option data has to be changed and
    - all alignment function has to be readjusted .




   The initial state of adjustment are as follows;                                          Service Remocon


                          28TAF                28TUF         28TFF
                                                                            POWER
  TUNER                  3303KHC            DT21V17D        3303KHC
                                                                                            N O R M AL             EW
                                                                                                                                   OPT
  LANGAGE                  French             English       English         SVC                                                              ION


  W/B                    RGB = 32                32           32
                                                                                                          PR

  AGC                        11                   9           10                      VOL                                      VOL
                                                                                                          PR

  V-CENTER                   30                  37           30              SEARCH
                                                                                                      EFFECT            TREBLE
                                                                               STOP

  V-SIZE                     52                  54           52                                                   MIN          MAX
                                                                                                      MODE                   BASS
  V-SLOPE                    27                  28           27
                                                                       RCH



                                                                                                                   MIN           MAX
                                                                      SEA




                                                                                                      WOOFER                 BAL
  S-COR                      15                  15           15
                                                                                                                    L                R
  H-CENTER                   43                  42           42
                                                                            TEM




                                                                                                      MAX          MAX           MAX
                                                                           SY S




  WIDTH                      63                  63           62
                                                                      SE T




                                                                                                      CONT         BRI             COL
                                                                      CH




                                                                                                      MIN          MIN           MIN
  PARA                       36                  38           37

  CORNER                     30                  28           30                                         AUTO
                                                                              AFT           AFT-L'       TEST           AV           TTX

  TRAPI                      29                  28           29
                                                                                  +           +            +            +             +

                                                                           V- CENTER        V- SIZE     V- SLOPE    S-COR.         SUB BRI.

                                                                                               -           -             -               -


                                                                                                                             H-CENTER
                                                                                  +           +            +            L                R

                                                                                  R           G            B
                                                                                                                               AGC
                                                                                               -            -            -               +

                                                                                                                                R-30SVC




                                                                       REMOTE CONTROLLER R-30SVC




                                                        8
     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)




                                                                9
     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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