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DVT-14H1TF
Service Manual
40 pgs2.94 Mb1

DAEWOO DVT-14H1TF, DVT-20H1TF, DVT-14H2TF, DVT-20H2TF, DVT-14H1TP Service Manual

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S/M No:TCP062PEF0
Service Manual
TV / VCR Combination
CHASSIS : CP-062
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
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)P G,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 OPERATIONMODE: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=UHFONL Y) AUX.TERMINAL SCARTJACK(REAR) OTHERFEATURE ONSCREENDISPLAY,SLEEPTIMER,WAKEUPTIMER
 FULLAUTOSEARCH,MANUAL/FINETUNING  CHILDLOCK,AUTOREPEAT  PICTURETYPESELECTION(NORMAL1/2,FAVOURITE)  INDEXSEARCH,TV/AV VIDEOSECTIONSINGLESYSTEM PAL/SECAMcolourandCCIRmonochromesignals,625lines/50fields. INPUT 1Vp-p,75ohms,unbalanced OUTPUT 1Vp-p,75ohms,unbalanced AUDIO INPUT -3.8dBm(500mVrms),morethan47Kohms,unbalanced OUTPUT -3.8dBm(500mVrms),lessthan1Kohm,unbalanced GENERAL TEMPERATRE 5Cto35C(operating),-20Cto60C(storagetemperature) FORMAT standard TAPEWIDTH 12.65mm TAPESPEED SP:23.39mm/sec,LP:11.70mm/sec

  
DAEWOO ELECTRONICS CO., LTD
  
http : //svc.dwe .co.kr
NUMBEROFPROGRAM70PROGRAM
REMOTECONTROLLERR-46Cwith2"AAA"typebatteries
RECORDINGSYSTEMRotary2-HeadhericalScanwithaslantdoubleazimuthcombinationvideohead
SIGNALTONOISERATIO 45dBwithNETTETEIMAGEcontrolatcenterposition. HORIZONTALRESOLUTION 240lineswithNETTETEIMAGEcontrolatcenterposion RECORDINGSYSTEM LONGITUDINALTRACK
FREQUENCYRANGE 100Hzto8KHZ
SIGNALTONOISERADIO 40dB(morethan)
MAX.RECORDINGTIME SP:240min.winE-240videocassette WITHFULLSIZECASSETTE LP:480min.withE-240videocassette
Aug.2000
REMARK
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
1
SAFETY INSTRUCTION
WARNING
THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCTION SAFETY NOTICE" BELOW.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazard
requires servicing,the high voltage should be checked.
2. The only source of X-RAY radiation in this TV receiver
: BEFORE SERVICING THIS CHASSIS, READ
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
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.
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.
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.
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.
2
SPECIFICATION
ITEMS MODEL DVT-14/20H1(T)F, DVT-14/20H2(T)F, DVT-14/20H1(T)P, DVT-14/20H2(T)P,
TV SECTION
VIDEO SECTION
AUDIO
GENERAL TEMPERATRE 5°C to 35
STANDARD PAL-B/G(F MODEL)
SCREEN SIZE 14”: A34JLL90X01, A34AGT13X, A33LPE02X01, A34EAC01X06
MAIN VOLTAGE 220V~240V AC, 50Hz POWER
CONSUMPTION SOUND OUTPUT 1Wmin(14”), 1.2 Wmin(20”)(at 60% mod., 10% THD) SPEAKER 3Watts 8 Ohm ANTENNA
IMPEDANCE TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING TUNER VHF-L: E2-S7
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
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 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)
FORMAT standard TAPE WIDTH 12.65mm TAPE SPEED SP : 23.39mm/sec
MAX. RECORDING TIME WITH FULLSIZE CASSETTE
DVT-14/20H1(T)D, DVT-14/20H2(T)D, DVT-14H2(T)FG/(T)PG , DVT-14H2(T)FB/(T)PB
PAL-I/II(P MODEL) PAL/SECAM-B/G, D/K (D MODEL)
20”: A48JLL90X01, A48LPE01X01, A48EAX33X01
STAND BY MODE : BELOW 5 Watts OPERATION MODE : 14” = 59Watts, 20” = 65Watts
75 Ohm unbalanced input
VHF-H:S8-S36 UHF:S37-E69(PAL-I = UHF ONLY)
FULL AUTO SEARCH, MANUAL/FINE TUNING CHILD LOCK AUTO REPEAT PICTURE TYPE SELECTION(NORMAL 1/2, FAVOURITE) INDEX SEARCH, TV/AV
°C(operating)
-20°C to 60°C(storage temperature)
LP : 11.70mm/sec SP :240min. win E-240 video cassette
LP :480min. with E-240 video cassette
REMARK
NOTE
Design and specifications can be subjected to change without notice.
3
CIRCUIT BLOCK DIAGRAM
4
ALIGNMENT INSTRUCTIONS
1. MAIN TUNER AGC
1) Set a Pattern Generator with RF level 62
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
∗
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
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.
6
2 dBuV, 210.25 MHz.
6
5Vdc .
6
5Vdc .
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.
5
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)
CONNECTION METHODE
PY03
ADJUST JIG
4
ALIGNMENT INSTRUCTIONS
OSCILLOSCOPE1
CH2
2
CH1
OSCILLOSCOPE2
P601
3
CH1
2 1
* 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.
max. (figure 1) (figure 2)
6
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.
7
SERVICE REMOCON
1. DIAGRAM
LANGUAGE
V-SLOPE
V-CENT V-SIZE H-CENT
5'th
4'th
3'rd
2'nd
GR
S-CORR
B
ATK OFF
OSD
REC
AGC+
SUB AGC
AGC-
1'st
SCREEN
OSD
SHIPPING
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.
8
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: 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.
(RED, RED)
9
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
10
SCHEMATIC DIAGRAM
11
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