Daewoo DVT-14H1TF, DVT-20H1F, DVT-20H1TF, DVT-20H1P, DVT-14H1TP Service Manual

TV / VCR Combination

CHASSIS : CP-062

MODEL :

DAEWOO ELECTRONICS CO., LTD

Service Manual

S/M No:TCP062PEF0

http : //svc.dwe .co.kr

Aug.2000

SPECIFICATIONS

DVT-14/20H1(T)F DVT-14/20H2(T)F
DVT-14/20H1(T)P DVT-14/20H2(T)P
DVT-14/20H1(T)D DVT-14/20H2(T)D
DVT-14H2(T)FG/(T)PG DVT-14H2(T)FB/(T)PB

ITEMS  MODEL DVT-14/20H1(T)F,DV T-14/20H2(T)F,DV T-14/20H1(T)P,DV T-14/20H2(T)P,

 DVT-14/20H1(T)D,DVT-14/20H2(T)D,DVT-14H2(T)FG/(T)PG,DVT-14H2(T)FB/(T)PB

TVSECTION STANDARD PAL-B/G( FMODEL),PAL-I/II( PMODEL),PAL/SECAM-B/G ,D/K(DMODEL)
 SCREENSIZE 14":A34JLL90X01 ,A34AGT13X,A33LPE02X01 ,A34EAC01X06,
 20":A48JLL90X01,A48LPE01X01 ,A48EAX33X01
 MAINVOLTAGE 220V~240VAC ,50Hz
 POWER STANDBYMODE:BELO W5Watts
 CONSUMPTION OPERATIONMOD E:14"=59Watts ,20"=65Watts
 SOUNDOUTPUT 1Wmin(14"),1. 2Wmin(20")(at60%mod.,10%THD)
 SPEAKER 3Watts8Ohm
 ANTENNA
 IMPEDANCE 75Ohmunbalance dinput
 TUNINGSYSTEM FVS(FREQUENC YSYNTHESIS )TUNING
 TUNER VHF-L:E2-S7,VHF-H:S8-S36 ,UHF:S37-E69( PAL-I=UHFONLY)


NUMBEROFPROGRAM70PROGRAM

 AUX.TERMINAL SCARTJACK(REAR)


REMOTECONTROLLERR-46Cwith2"AAA"typebatteries

 OTHERFEATURE ONSCREENDISPLAY,SLEEPTIMER,WAKEUPTIMER

 FULLAUTOSEARCH,MANUAL/FINETUNING
 CHILDLOCK,AUTOREPEAT
 PICTURETYPESELECTION(NORMAL1/2,FAVOURITE)
 INDEXSEARCH,TV/AV
VIDEOSECTIONSINGLESYSTEM PAL/SECAMcolourandCCIRmonochromesignals,625lines/50fields.


RECORDINGSYSTEMRotary2-HeadhericalScanwithaslantdoubleazimuthcombinationvideohead

 INPUT 1Vp-p,75ohms,unbalanced
 OUTPUT 1Vp-p,75ohms,unbalanced


SIGNALTONOISERATIO 45dBwithNETTETEIMAGEcontrolatcenterposition.



HORIZONTALRESOLUTION 240lineswithNETTETEIMAGEcontrolatcenterposion

AUDIO

RECORDINGSYSTEM LONGITUDINALTRACK

 INPUT -3.8dBm(500mVrms),morethan47Kohms,unbalanced
 OUTPUT -3.8dBm(500mVrms),lessthan1Kohm,unbalanced


FREQUENCYRANGE 100Hzto8KHZ



SIGNALTONOISERADIO 40dB(morethan)

GENERAL TEMPERATRE 5Cto35C(operating),-20Cto60C(storagetemperature)
 FORMAT standard
 TAPEWIDTH 12.65mm
 TAPESPEED SP:23.39mm/sec,LP:11.70mm/sec


MAX.RECORDINGTIME SP:240min.winE-240videocassette



WITHFULLSIZECASSETTE LP:480min.withE-240videocassette

 








REMARK

1

TABLE OF CONTENTS

SAFETY INSTRUCTION .................................................................................................... 2

SPECIFICATION ............................................................................................................ 3

CIRCUIT BLOCK DIAGRAM ............................................................................................ 4

ALIGNMENT INSTRUCTIONS............................................................................................ 5

SERVICE REMOCON DIAGRAM..................................................................................... 8

SCHEMATIC DIAGRAM.................................................................................................. 11

EXPLODED VIEW .......................................................................................................... 13

PRINTED CIRCUIT BOARD............................................................................................... 15

SERVICE PARTS LIST ....................................................................................................... 16

Different parts list for size ..................................................................................................................27

The different parts list for system.......................................................................................................29

APPENDIX ( Appendix is provided only by internet [http://svc.dwe.co.kr] )

CIRCUIT DESCRIPTION................................................................................................... 1

2

SAFETY INSTRUCTION

WARNING

: BEFORE SERVICING THIS CHASSIS, READ
THE "X-RAY RADIATION PRECAUTION", "SAFETY
PRECAUTION" AND "PRODUCTION SAFETY NOTICE"
BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazard

ous X-RAY RADIATION. To avoid such hazards,
the high voltage must not exceed the specified limit
The nominal value of the highvoltage of this receiver is
23-25KV(14"),25-28KV(20") at max. beam current. The
high voltage must not,under any circumstances,
exceed 26KV (14"),30KV (20"). Each time a receiver

requires servicing,the high voltage should be checked.

It is recommended the reading of the high voltage be
recorded as a part of the service records, It is important
to use an accurate and reliable high voltage meter.

2. The only source of X-RAY radiation in this TV receiver

is the picture tube. For continuous X-RAY RADIATION
protection, the replacement tube must be exactly the
same type tube as specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this

receiver is operating. Operation of the receiver outside
the cabinet or with the back board removed involves a
shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is

not thoroughly familiar with the precautions necesary

when working on high voltage equipment.

2) Always discharge the picture tube before handling the

tube. The picture tube is highly evacuated and if
briken, glass fragments will be violently expelled.

2. If any fuse in this TV receiveris blown, replace it with

the FUSE specified in the Replacement Parts list.

3. When replacing a high wattage resistor ( metal oxide

film resistor ) in circuit board, keep the resistor 10mm
away from circuit board.

4. Keep wires away from high voltage or high temperature

components.

5. This receiver must operate under AC260 volts, 50Hz.

NEVER connect to DC supply or any other power or
frequency.

PRODUCT SAFETY NOTICE

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

3

SPECIFICATION

ITEMS MODEL DVT-14/20H1(T)F, DVT-14/20H2(T)F, DVT-14/20H1(T)P, DVT-14/20H2(T)P,

DVT-14/20H1(T)D, DVT-14/20H2(T)D, DVT-14H2(T)FG/(T)PG , DVT-14H2(T)FB/(T)PB

REMARK

TV
SECTION

STANDARD PAL-B/G(F MODEL)

PAL-I/II(P MODEL)
PAL/SECAM-B/G, D/K (D MODEL)

SCREEN SIZE 14”: A34JLL90X01, A34AGT13X, A33LPE02X01, A34EAC01X06

20”: A48JLL90X01, A48LPE01X01, A48EAX33X01
MAIN VOLTAGE 220V~240V AC, 50Hz
POWER

CONSUMPTION

STAND BY MODE : BELOW 5 Watts

OPERATION MODE : 14” = 59Watts, 20” = 65Watts
SOUND OUTPUT 1Wmin(14”), 1.2 Wmin(20”)(at 60% mod., 10% THD)
SPEAKER 3Watts 8 Ohm
ANTENNA

IMPEDANCE

75 Ohm unbalanced input

TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING
TUNER VHF-L: E2-S7

VHF-H:S8-S36

UHF:S37-E69(PAL-I = UHF ONLY)
NUMBER OF PROGRAM 70 PROGRAM
AUX. TERMINAL SCART JACK (REAR)
REMOTE CONTROLLER R-46C with 2 “AAA” type batteries
OTHER FEATURE ON SCREEN DISPLAY, SLEEP TIMER, WAKE UP TIMER

FULL AUTO SEARCH, MANUAL/FINE TUNING

CHILD LOCK

AUTO REPEAT

PICTURE TYPE SELECTION(NORMAL 1/2, FAVOURITE)

INDEX SEARCH, TV/AV

VIDEO
SECTION

SINGLE SYSTEM PAL/SECAM colour and CCIR mono chrome signals, 625lines/50fields.
RECORDING SYSTEM Rotary 2-Head herical Scan with a slant double azimuth combination video head
INPUT 1Vp-p, 75 ohms, unbalanced
OUTPUT 1Vp-p, 75 ohms, unbalanced
SIGNAL TO NOISE RATIO 45dB with NETTETE IMAGE control at center position.
HORIZONTAL RESOLUTION 240lines with NETTETE IMAGE control at center posion

AUDIO

RECORDING SYSTEM LONGITUDINAL TRACK
INPUT -3.8dBm(500m Vrms), more than 47 Kohms, unbalanced
OUTPUT -3.8dBm(500mVrms), less than 1Kohm, unbalanced
FREQUENCY RANGE 100Hz to 8KHZ
SIGNAL TO NOISE RADIO 40dB(more than)

GENERAL TEMPERATRE 5°C to 35

°C(operating)

-20°C to 60°C(storage temperature)
FORMAT standard
TAPE WIDTH 12.65mm
TAPE SPEED SP : 23.39mm/sec

LP : 11.70mm/sec

MAX. RECORDING TIME
WITH FULLSIZE CASSETTE

SP :240min. win E-240 video cassette
LP :480min. with E-240 video cassette

NOTE

Design and specifications can be subjected to change without notice.

4

CIRCUIT BLOCK DIAGRAM

5

ALIGNMENT INSTRUCTIONS

1. MAIN TUNER AGC

1) Set a Pattern Generator with RF level 62 6 2 dBuV, 210.25 MHz.

2) Connect a OSCILLOSCOPE PROBE to P101 ( TUNER AGC INPUT ).

3) Adjust AGC UP/DOWN KEY the voltage drop about 1V DC over below it's maximum voltage.

2. SCREEN

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Press the "SCREEN" KEY .

3) Connect a OSCILLOSCOPE PROBE to P901 ( CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 120V

6

5Vdc .

∗

Another methode

1) Press "AV Key" in condition of AV no signal.

2) Press the "SCREEN" KEY .

3) Connect a OSCILLOSCOPE PROBE to P901 ( CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 140 V

6

5Vdc .

3. WHITE BALANCE

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Adjust the R,G,B UP/DOWN KEY of the other color which did not appear on the screen to obtain WHITE.

4. FOCUS

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

5. GEOMETRY

5.1 S-CORRECTION

1) Apply a CROSSHATCH PATTERN SIGNAL.

2) Adjust the S-CORR UP/DOWN KEY obtain the same distance between horizontal lines.

5.2 VERTICAL SLOPE

1) Apply a RETMA PATTERN SIGNAL.

2) Pressing the V-SLOPE +/- KEY,the lower half of the screen is blanked.

3) Adjust the border line of blanked picture coincident with the center marks of the pattern
using the V-SLOPE +/- KEY.

5.3 VERTICAL CENTER

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the center line of pattern coincident with the mechanical center marks of the
CRT using the V-CENTER +/- KEY.

5.4 VERTICAL SIZE

∗

The V-CENTER adjustment has to be done in advance.

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the upperside of the pattern coincident with the mechanical center marks of
the CRT using the V-SIZE +/- KEY.

6

ALIGNMENT INSTRUCTIONS

5.5 HORIZONTAL CENTER

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust picture centering with H-CENTER +/- KEY.

6. DECK ADJUSTMENT

6-1. X-POSITION AND P2,P3 ADJUSTMENT

1) Adjust point : X-POSITION
Checking point : oscilloscope ch1 = H/SW (PY03 #2)
oscilloscope ch2 = PB ENVE (PY03 #4)
Triggering : CH1
Measuring Equipment : oscilloscope, path jig
Mode : PLAYBACK,ATK OFF
Test tape : DP-2 (6KHz)

* Adjustment Procedure

1) Connect the PATH JIG to PY03 after Test tape PLAYBACK

2) Insert the DP-2 TAPE. ( Auto playback)

3) Pressing the "ATK OFF" KEY.

4) Adjust the waveform of PB ENVE to maximum(figure1) using X-position VR.

5) Adjust IN/OUTPUT GUIDE until the exact waveform appear as bellow figure2.

OSCILLOSCOPE1

OSCILLOSCOPE2

CH2

CH1

ADJUST JIG

CONNECTION METHODE

PY03

P601

1

2

2

4

3

CH1

max.
(figure 1) (figure 2)

7

ALIGNMENT INSTRUCTIONS

6-2. AUTO PG ADJUSTMENT

1) After adjustment of 6-1. Press the " REC." button.

2) Eject the Test tape.
6-3. AZIMUTH ADJUSTMENT

1) Adjust point : AZIMUTH SCREW

Checking point : SOUND OUTPUT (P601)

Measuring Equipment : oscilloscope or audio level meter.
Mode : PLAYBACK
Test tape : DP-2 (6KHz)

* Adjustment Procedure

1) Connect the measuring equipment to the AUDIO OUTPUT (P601) terminal.

2) After test tape playback, adjust the output level maximally by varing the azimuth screw.

3) Fix the azimuth screw with locking paint.

∗

If EEPROM ( I702 ) has been changed :

- Option data has to be changed and

- all alignment function has to be readjusted.

8

SERVICE REMOCON

1. DIAGRAM

1'st

2'nd

3'rd

4'th

5'th

LANGUAGE

V-SLOPE

V-CENT V-SIZE H-CENT

S-CORR

B

GR

ATK OFF

OSD

SUB AGC

OSD

SHIPPING

AGC-

REC

AGC+

SCREEN

R-46C04

To enter the " SERVICE MODE"
Press NORMAL-> AV->SLEEP->CLEAR->POWER buttons in regular sequency
within 10seconds using USER REMOCON after setting ST-BY.

9

SERVICE REMOCON

2. HOW TO CHECK TV SECTION WITHOUT VCR DECK

If you want to check TV section without DECK mechanism, then please perform in this order.

1. Pull out the power cord.

2. Remove the VCR DECK mechanism.

3. Supply the main power. ( Main sw on )

4. Wait for about 10 seconds. ( You can see the light of power LED if the TV is normal.

5. Turn on the TV using the remocon. ( You can see the OSD "EMERGENCY" )

6. Check the TV section.

3. Refer to general adjustment

1. S-CORR +/- ( S-CORRECTION )

Press this button to adjust the same distance between horizontal lines on screen of crosshatch pattern.

2. V-SLOPE +/- ( VERTICAL SLOPE )

Press this button to adjust the border line of blanked picture coincident with the center marks of the pattern.

3. V-CENT +/- ( VERTICAL CENTER )

Press this button to adjust the center line of the pattern coincident with the mechanical center marks of the CRT on

screen of RETMA pattern.

4. V-SIZE +/- ( VERTICAL SIZE )

Press this button to adjust the upperside of the pattern coincident with the mechanical center marks the CRT on

screen of RETMA pattern.

5. H-CENT +/- ( HORIZONTAL CENTER )

Press this button to adjust picture centering with H-center on screen of RETMA pattern.

6. R,G,B +/- ( WHITE BALANCE )

The screen is become WHITE adjust R,G,B level by this button.

7. ATK OFF ( Auto tracking off )
Press this button to adjust X-Position adjustment.
Front panel's LED's are lighted up if you press this button.
Press the PB button.
ATK OFF:

(RED, RED)

ATK MAX : (BLINK, OFF)

ATK MIN : (OFF, BLINK)
ATK ON : (BLINK,BLINK) ; LEFT LED = ST-BY, RIGHT LED = REC/T.REC"

8. REC
Press this button to adjust AUTO PG.

9. SCREEN
Press this button to adjust the screen volume on FBT.

10. SHIP ( SHIPPING CONDITIONS )
Press this button to set the SHIPPING CONDITIONS.

11. SUB AGC ( Only 2-TUNER Model )
Press this button to adjust SUB TUNER AGC.
Press once : picture is displayed colour pattern.
Press once more : picture is displayed black/white pattern.

12. AGC +/­ Press this button to adjust MAIN TUNER AGC.

10

SERVICE REMOCON

13. STILL
Press this button to enter the PAUSE/STILL mode.

14. STOP
Press this button to enter the STOP mode.

15. REW/REV
Press this button to enter the REW/REV mode.

16. PLAYBACK
Press this button to enter the PLAYBACK mode.

17. FF/CUE
Press this button to enter the FF/CUE mode.

18. LANGUAGE
Press this button to enter the LANGUAGE SELECTION mode.
You can select the language by AGC+(moving up) and AGC-(moving down)
buttons.

19. OSD
Press this button to adjust the OSD H-Position.

∗

If you forget your " child lock secret No. "

-> 1. Enter the SERVICE MODE.

2. POWER OFF/ON

11

SCHEMATIC DIAGRAM