Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo TV daewoo-cp370

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daewoo-cp370


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 Service Manual
  38 / 48 / 51 Cm Mono Colour Television
                 CHASSIS : CP-370


                  MODEL : 14Q1/20Q1/21Q1
                          14Q2/20Q2/21Q2
                          14Q3/20Q3/21Q4
                          14T1/20T1/21T1
                          14T2/20T2/21T2
                          14T3/20T3




                              PP
                              @@
                              ,,
DAEWOO ELECTRONICS CO., LTD.
                                                     CONTENTS

Specifications ................................................................................................................ 1
Safety Instruction ......................................................................................................... 2
Circuit block Diagram ................................................................................................. 3
Alignment Instructions ............................................................................................... 4
IC Description ................................................................................................................ 7
Circuit Description ....................................................................................................... 31
PCB Layouts
      PRINTED CIRCUIT BOARDS .................................................................................... 38
      SCHEMATIC DIAGRAM ............................................................................................. 39

Trouble Shooting Charis ............................................................................................. 40
Important IC Voltage Charts .............................................................................................. 47

Electrical Part List............................................................................................................... 49

Q Model T Model Difference Part List ............................................................................... 64

Inch difference Part List ..................................................................................................... 65

Mechanical Exploded View and Part List ......................................................................... 66
   Specifications
Q : 1SPEAKER MODEL, T : 2SPEAKER MODEL
VM : WITHOUT TXT. MODEL, TM : WITH TXT. MODEL

TV Standard         PAL/SECAM-B/G, D/K, I, H, NTSC-3.58/4.43
Mains Voltage       100~250V AC, 50/60Hz
Power Consumption   14"Q = 69W, 14"T = 74W
                    20"Q = 79W, 20"T = 84W
                    21"Q = 79W, 21"T = 84W
Sound output          . 1 Speaker : 3W( at 80% MOD. 10% THD)
                      . 2 Speaker : 4W + 4W( at 80% MOD. 10% THD)
Speaker               . 1 Speaker : 3W, 16 ohm
                      . 2 Speaker : 7.5W, 8 ohm(2EA)
Antenna             75 ohm unbalanced
Impedance           300 ohm balanced with supplied balun
Tuning system       Voltage Synthesize Tuning System
Memory channel      VM : 100 channels, TM : 70 channels
Reception           VHF - L : CH2 - CH4
channel Unit        VHF - H : CH5 - CH12
                    Cable Band : CHS1' - CHS3', CHS1 - CHS20
                    Hyper Band : CHS21 - CHS40(option)
                    UHF : CH21 - CH69
Remote control      VM : R-28B04, TM : R-28B03
Screen size         14" : 34cm (A34JLL 90 02)
                    20" : 48cm (A48JLL 90 02)
                    21" : 51cm (A51JLL 90 02)
Weight              14" : 9.5Kg(set)
                    20" : 16.5Kg(set)
                    21" : 20.5Kg(set)
Indication          On-Screen Display
                    - MENU
                      Picture(Bright, Color, Contrast, Sharpness, TINT)
                      TIMER(CLOCK, WAKE-UP-TIME, ACTIVATE, WAKE-UP-PROG)
                      LANGUAGE
                      PRESET
                      EDIT
                      SLEEP TIMER
                      AV
                      SOUND MUTE
                      VOLUME CONTROL




                                                    1
    Safety Instruction

WARNING: Before servicing this chassis, read the "X-RAY RADIATION precaution", "safety
precaution" and "product safety notice" below.


  X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially              voltage should be checked. It is recommended
   hazardous X-RAY RADIATION.To avoid such                     the reading of the high voltage recorded as a part
   hazards, the high voltage must not exceed the               of the service records. it is important to use an
   specified limit. The nominal value of the high              accurate and reliable high voltage meter.
   voltage of this receiver is 22-23kv(14"), 25-            2. The only source of X-RAY Radiation in this TV
   26kv(20", 21") at max beam current. The high                receiver is the picture tube. For continuous
   voltage must not, under any circumstances,                  RADIATION protection, the replacement tube
   exceed 27.5kv (14", 20"), 29.0kv(21").                      must be exactly the same type tube as specified
   Each time a receiver requires servicing, the high           in the parts list.




  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 cover                  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 AC260 volts,
  2) Always discharge the picture tube to avoid the            50Hz/60Hz. (AC 100~250 volts, 50/60Hz)NEVER
     shock hazard before removing the anode cap.               connect to DC supply or any other power or
  3) Discharge the high potential of the picture tube          frequency.
     before handling the tube. The picture tube is
     highly evacuated and if broken, glass
     fragments will be violently expelled.




  PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis        identified by designated symbol on the parts list.
have special safety-related characteristics.                Before replacing any of these components, read the
These characteristics are often passed unnoticed            parts list in this manual carefully. The use of
by a 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 created 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




                                                        2
     Alignment Instructions
1. AFT

1.1 Standard B/G,D/K,I
 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
               NTSC - 3.58/4.43
 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".

2. AGC
  1) Set a Pattern Generator with RF LEVEL 63



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