Daewoo DV6T712D Service Manual
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Daewoo DV6T712D Service Manual

Daewoo DV6T712D Service Manual

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Service Manual
MODEL: DV6T712D / DV6T112D
 Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
S/M No. : VTB712DET0
DV6T712P / DV6T112P
DV6T712S / DV6T112S
DV6T722D
DV6T722P
DV6T722S
DVD
VCR
MENU
TITLE/PBC
DISPLAY
OPEN/CLOSE
OUTPUT
PR
SETUP
ENTER
PR
REPEAT
ZOOM
AUDIO
SUBTITLE
PREV
NEXT
PLAY/PAUSE
PROGRAM
SEARCH
CLK/CNT
MARK
REC
SPEED/ANGLE
TV/VCR
TRACKING
SYSTEM
Nov. 2002

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  • Page 1 S/M No. : VTB712DET0 Service Manual MODEL: DV6T712D / DV6T112D DV6T712P / DV6T112P DV6T712S / DV6T112S DV6T722D DV6T722P DV6T722S MENU TITLE/PBC DISPLAY OPEN/CLOSE OUTPUT SETUP ENTER REPEAT ZOOM AUDIO SUBTITLE PREV NEXT PLAY/PAUSE PROGRAM SEARCH CLK/CNT MARK SPEED/ANGLE TV/VCR TRACKING...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ......................2 ADVANTAGES OF THIS PRODUCT ................3 TROUBLE SHOOTING ........................5 WAVEFORMS..........................25 CIRCUIT DIAGRAM........................28 PCB CIRCUIT BOARD ......................34 INSTRUMENT DISASSEMBLY....................37 ELECTRICAL PARTSLIST......................45...

  • Page 3: Specifications

    SPECIFICATIONS Power 230V~, 50Hz Consumed electricity Hi-Fi : 24W, Mono : 23W Weight 5.7kg Dimension (W x H x D) 430mmx91mmx355.5mm Operative temperature +5°C~40°C Installation condition Horizontal / Relative humidity under 80% Signal type PAL/SECAM/MESECAM COLOR Antenna Input/output U/V-mixed: 75Ω unbalanced VIDEO input 1.0Vp-p (unbalanced, RCA JACK) AUDIO input...

  • Page 4: Advantages Of This Product

    ADVANTAGES OF THIS PRODUCT • DVD, VCD, CD, CD-R(MP3), CD-RW, VHS • DVD one-touch record function • Watching DVD for recording broadcast • Integrated remote control (VCR, DVD) • VISS function • Multiplex sound playback/record (Hi-Fi Model) • High Sound Quality of 6 head Hi-Fi (Hi-Fi Model) •...
  • Page 5 ADVANTAGES OF THIS PRODUCT • Slow Forward / Reverse playback (DVD) • Fast Forward / Reverse playback • Search of title, chapter, and time in DVD disc, and search of time and track time in VCD and CD • Various TV aspect (DVD) 4:3 for Pan and Scan, 4:3 for Letter Box, and 16:9 for Wide •...

  • Page 6: Troubleshooting

    TROUBLESHOOTING 1. POWER CIRCUIT CAUTION You must use insulated trance during the first part test of POWER circuit. No power Exchange POWER CORD POWER cord is ok? Check Is 400~200V voltage obtained at C805 +? F801,L801,L802,D801. Output voltage of 2 Check IC601,IC701.
  • Page 7 TROUBLESHOOTING 2. SYSTEM CIRCUIT A. LED DISPLAY No LED display. Is 5V obtained at IC701 Check R705, L601. pin #9, 25? Oscillation at IC701 pin #1? Exchange IC701. Specific GRID/SEG doesn’t function. GRID output at PORT of Check IC 701 pin #22~24, 27, IC701? 28, 30, 31.
  • Page 8 TROUBLESHOOTING B. No power compensation. No power compensation. Voltage of power fail (IC601 Check R644. pin#3) at micom is 0.7V over? More than 3.2V is maintained for 1 minutes at IC601 pin#37 Check RESET circuit. during Power Cord Open. Exchange IC601.
  • Page 9 TROUBLESHOOTING C-1. Bad playback quality (1) Noise appears on the playback screen. Is noise diminished by tracking Re-adjust PATH. adjustment. Noise band is trembled up and Noise appears on the screen Re-adjust PATH. down? even though changing tape. Is there CTL pulse at IC601 Re-adjust the height of AC Is the height of CTL HEAD normal? pin#97?
  • Page 10 TROUBLESHOOTING C-2. Bad playback quality (2) Noise appears on the Full Recheck step C-1 (Bad playback screen. playback quallty (1)). Are SW pulse and HA SW Are there SW, HA SW pulse at Check IC601. normal? IC601 pin #16, 18? Check PCB Pattern.
  • Page 11 TROUBLESHOOTING E. No CASSETTE Loading Cassette tape isn’t inserted. Is 5V voltage obtained at Check at ON/OFF 12. Loading parts IC601 pin#82? Check (D822, Q851). Is 13V voltage obtained at Check D851 and POWER circuit. Capstan Motor pin#8? Connect Capstan and Loading Motor. Is 12V voltage obtained at Each Check connector and Capstan Motor.
  • Page 12 TROUBLESHOOTING G. DRUM Motor stops DRUM Motor stops. Is 13V voltage obtained at Check ON/OFF 13V P603 pin#8? (D851, Q856). Is DRUM PWM fit to IC 601 Check DRUM PG/FG pin#76? (IC 601 #90). Is 1.2V voltage obtained at Check R657, R658,C661,C668. P603 pin#12? Check Capstan Motor and DRUM Motor.

  • Page 13: Video Circuit

    TROUBLESHOOTING 3. VIDEO circuit A. EE screen doesn’t appear EE screen doesn’t appear. Is Video signal input at IC301 Check LINE JACK and IF circuit. pin#48,50,52,54? Check DVD circuit. Is 5V obtained at IC301 pin#24, Check POWER 5V. 42, 55, 72, 91? Is signal input at IC302 Check LINE JACK and IF circuit.
  • Page 14 TROUBLESHOOTING B. Playback picture doesn’t appear Playback picture doesn’t appear. Is Envelope output at IC301 Is 5V obtained at IC301 Check POWER 5V. pin#79? pin#91? Is SW Pulse input at IC301 Check IC601 pin#18. pin#70? Check and Replace HEAD. Is Y signal output at IC301 Is 5V obtained at IC301 Check POWER 5V.
  • Page 15 TROUBLESHOOTING C. No recording No recording. Check EE MODE. Is FM signal output at IC301 Is signal input at IC301 pin# pin#78? 48, 50, 52, 54? Is 5V obtained at IC301 Check POWER circuit. pin#91? Is IC301 pin#80 REC(H) Check IC601 pin#22. HIGH? Is VIDEO SW Pulse input at Check IC601 pin#18.
  • Page 16 TROUBLESHOOTING D. No OSD(On Screen Display) appears No OSD appears. Is 5V obtained at IC601 pin# Check POWER circuit. 53, 98, 99? Is Video signal output at IC601 Is Video signal input at IC601 Check IC 301. pin#52? pin#50? Check IC 601. Check IC 601.
  • Page 17 TROUBLESHOOTING 4. AUDIO (Hi-Fi MODEL) A. No sound in E-E mode A. a.RF E-E No sound in RF E-E mode Is there Audio at IC252 Check IC121, RF101 block. pin#4,11? Is RF Audio signal output at Is 12V obtained at IC252 Check POWER circuit.
  • Page 18 TROUBLESHOOTING A. b. AV1 E-E No sound in AV1 E-E mode. Check Input JACK. Is there Audio IC252 pin#2,15? Is 12V obtained at IC252 Is RF Audio signal output at Check POWER circuit. pin 16? IC252 pin#3,13? IC601 pin#31 is H, Check IC601.
  • Page 19 TROUBLESHOOTING A. c. AV2 E-E No sound in AV2 E-E mode. Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Is there Audio at IC251 Check Input JACK. pin#8,9 in AV2 mode? (Scart AV2) Is AV2 Audio signal output at Are CLK and DATA obtained at IC251 Replace IC251.
  • Page 20 TROUBLESHOOTING A.d. AV-F E-E No sound in AV-F E-E mode Is there Audio at IC253 Check Input JACK. pin#2,12 in AV-F mode? (FRONT AV) Is AV-F Audio signal output Is 12V obtained at IC253 Check POWER circuit. at IC253 pin#14,15? pin#16? Check IC601.
  • Page 21 TROUBLESHOOTING A. c. DVD E-E No sound in DVD E-E mode. Is there Audio at IC253 Check OP-AMP block.(A. e2) pin#1,13 in DVD mode? Is DVD Audio signal output Is 12V obtained at IC253 Check POWER circuit at IC253 pin#14,15? pin#16? Check IC601.
  • Page 22 TROUBLESHOOTING B. No Hi-Fi playback audio (PLAY MODE) Is there A.SW signal at IC251 Check A.SW at IC601 pin#19. pin#41? Is there playback audio signal Replace IC251. at IC251 pin#16,17? Is there Audio at IC252 Check signal flow circuit pin#1,12? from IC251 to IC252.
  • Page 23 TROUBLESHOOTING C. No Hi-Fi Audio in record/playback mode(REC MODE) No Hi-Fi Audio in record/playback mode IC251 pin#2, 3, Check Input AV1 JACK. IC251 pin#6, 7, Check Input AV-F JACK. IC251 pin#10, 11, IC251 pin#4,5 Check ICD03(DVD) Block. IC251 pin#8, 9. Check Input AV2 JACK.
  • Page 24 TROUBLESHOOTING E. No NORMAL AUDIO playback (PLAY MODE) No Normal Audio in playback mode Is there siganl at IC252 Signal at IC251 pin#21 is Check POWER circuit. pin#3,13? transferred to IC301 pin#13,15,17? Is there playback Audio Check A/C HEAD. signal at IC301 pin#11? Check IC301.
  • Page 25 TROUBLESHOOTING F. No NORMAL Auido in record/playback mode(Check in REC mode) No Normal Audio in record/playback mode IC251 pin#2, 3, Check Input AV1 JACK. IC251 pin#6, 7, Check Input AV-F JACK. IC251 pin#10, 11, IC251 pin#4,5 Check ICD03(DVD) Block. IC251 pin#8, 9. Check Input AV2 JACK.

  • Page 26: Waveforms

    WAVEFORMS 1. VIDEO SP IC301-88.89 3.0Vp-p EP IC301-94.95 2.2 Vp-p 1V/10msec/cm REC IC301 63 or 61 & IC302 14 IC301 63 or 61 & IC302 14 (IC604-3) (IC301 -70) (IC301 -70) 0.5/5msec/cm 0.5/5msec/cm SP PLAY/REC EP PLAY/REC...
  • Page 27 WAVEFORMS 2. AUDIO 2-1 AUDIO(Mono) P201-2...
  • Page 28 WAVEFORMS 2-2 AUDIO(HI-Fl) Q901-collector 3. SERVO/SYSCON (IC601-18) 5Vp-p (IC601-77) 5Vp-p (IC601-76) 5Vp-p (IC601-94) 3Vp-p 2V/5msec/cm sec/cm sec/cm 1V/5msec/cm REC/PLAY REC/PLAY REC/PLAY (IC601-97) 4.4Vp-p (IC601-90) 25Vp-p&5Vp-p (IC601-87) 2.5Vp-p (IC601-38) 2.6Vp-p 1V/5msec/cm 1V/5msec/cm 1V/0.2msec/cm 0.5V/0.1µ sec/cm PLAY REC/PLAY REC/PLAY REC/PLAY...

  • Page 29: Circuit Diagram

    CIRCUIT DIAGRAM 1. POWER SUPPLY SCHEMATIC DIAGRAM (PAL COMBO)
  • Page 30 CIRCUIT DIAGRAM 2. AV CIRCUIT DIAGRAM...
  • Page 31 CIRCUIT DIAGRAM 3. SERVO & SYSCON SCHEMATIC DIAGRAM...
  • Page 32 CIRCUIT DIAGRAM 4. DIGITAL AUDIO SCHEMATIC DIAGRAM...
  • Page 33 CIRCUIT DIAGRAM 5. HI FI & SW CIRCUIT DIAGRAM...
  • Page 34 CIRCUIT DIAGRAM 6. IF/MPX/PDC/INPUT-OUTPUT SCHEMATIC DIAGRAM...

  • Page 35: Pcb Circuit Board

    PCB CIRCUIT BOARD 1-1 . VCR (MAIN)
  • Page 36 PCB CIRCUIT BOARD 1-2. POWER...
  • Page 37 PCB CIRCUIT BOARD 1-3. LOGIC...

  • Page 38: Instrument Disassembly

    INSTRUMENT DISASSEMBLY 1. DECK DISASSEMBLY Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/ wiring are routed correctly when reassembling. A. LEG REMOVAL FIG. 1 B. TOP COVER REMOVAL FIG. 2...
  • Page 39 INSTRUMENT DISASSEMBLY C. PANEL FRONT DISASSEMBLY FIG. 3...
  • Page 40 INSTRUMENT DISASSEMBLY D. LOGIC PCB DISASSEMBLY FIG. 4...
  • Page 41 INSTRUMENT DISASSEMBLY E. DECK AND MAIN PARTS DISASSEMBLY FIG. 5...
  • Page 42 INSTRUMENT DISASSEMBLY F. MAIN PCB DISASSEMBLY FIG. 6...
  • Page 43 INSTRUMENT DISASSEMBLY G. MAIN CHASSIS DISASSEMBLY FIG. 7...
  • Page 44 INSTRUMENT DISASSEMBLY FIG. 8...

  • Page 45: Electrical Partslist

    PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PVMCASE200 CHASSIS MAIN AS DV6T712D-AQ RF101 97P7618500 TUNER 3 IN 1 SSTMI-BG5 PAL MONO A001 97P0612300 CHASSIS MAIN HI-PS RF101 97P7619500 TUNER 3 IN 1...

  • Page 46: Electrical Partslist

    ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C184 HCFH223ZBA C CHIP CERA 25V Y5V 0.022MF Z 1608 HI-FI C386 HCQK330JBA C CHIP CERA 50V CH 33PF J 1608 C184 HCBK122KBA C CHIP CERA 50V X7R 1200PF K 1608 MONO C387 HCQK330JBA...
  • Page 47 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK IC141 1LC74793 IC VPS LC74793JM HI-FI R203 HRFS334JBA R CHIP 1/16 330K OHM J 1608 IC251 1TDA9605H- IC HI-FI TDA9605H HI-FI R204 HRFS201JBA R CHIP 1/16 200 OHM J 1608 IC252 1CD4052BCM IC CHIP SW...
  • Page 48 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R379 HRFS202JBA R CHIP 1/16 2K OHM J 1608 R939 HRFS103JBA R CHIP 1/16 10K OHM J 1608 R381 HRFS202JBA R CHIP 1/16 2K OHM J 1608 R940 HRFS471JBA R CHIP 1/16 470 OHM J 1608 R383 HRFS202JBA...
  • Page 49 HRFS155JBA R CHIP 1/16 1.5M OHM J 1608 C285 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 Z0012 PVMPJRE200 MAIN RADIAL AUTO AS DV6T712D-AQ C286 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 C101 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 C287...
  • Page 50 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C373 CMXM2A222J C MYLAR 100V 2200PF J (TP) SECAM L201 5CPX680J2T COIL PEAKING 68UH(BLU-BLK) C374 CMXM2A222J C MYLAR 100V 2200PF J (TP) SECAM L202 5CPX680J2T COIL PEAKING 68UH(BLU-BLK) C375 CEXF1H229A C ELECTRO 50V RSM 2.2MF (4X7) TP SECAM...
  • Page 51 85801060TA WIRE COPPER 0.6X52MM TAPING X301 5XE4R433TB CRYSTAL QUARTZ HC-49/U 4.433619MHZ 15PPM D853 85801060TA WIRE COPPER 0.6X52MM TAPING Z0013 PVMPJAE200 MAIN AXIAL AUTO AS DV6T712D-AQ D854 DZUZ13BSB- DIODE ZENER UZ-13BSB(12.59-13.16V) AM31 2TM1456000 TAPE MASKING SI-602 D856 DZUZ5R1BSB DIODE ZENER UZ-5.1BSB(4.97-5.18V)
  • Page 52 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK L166 85801060TA WIRE COPPER 0.6X52MM TAPING R262 RD-AZ680J- R CARBON FILM 1/6 68 OHM J HI-FI L307 85801060TA WIRE COPPER 0.6X52MM TAPING R270 RD-AZ470J- R CARBON FILM 1/6 47 OHM J HI-FI L601 5CPZ101K02...
  • Page 53 U001 97P65321MA PCB MAIN 330*247*1.6T JP058 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING Z0014 PVMPJVE200 PCB MAIN JUMP ONLY AS DV6T712D-AQ JP059 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP001 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP060 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 54 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK JP064 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP132 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP065 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP133 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP066 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 55 JP350 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP245 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING Z003 PVLAMSE200 PCB LOGIC MANUAL AS DV6T712D-AQ JP246 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING AL01 2193100801 SOLDER WIRE SN:PB=63:37 3PI(NO FLUX) JP247 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 56 SW701 5S50101Z90 SW TACT THVV502GDA U002 97P65319UA PCB UNION 330*246*1.6T/3 SW702 5S50101Z90 SW TACT THVV502GDA Z800 PVPWMSE200 PCB POWER MANUAL AS DV6T712D-AQ SW703 5S50101Z90 SW TACT THVV502GDA AP01 2193100801 SOLDER WIRE SN:PB=63:37 3PI(NO FLUX) SW704 5S50101Z90 SW TACT THVV502GDA AP02...
  • Page 57 JP816 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING Q803 TZTC3198Y- TRANSISTOR KTC3198Y-(1815Y) (AUTO) L803 5PB13857 COIL BEAD BI3857(AXIAL) Z8012 PVPWJAE200 POWER AXIAL AUTO AS DV6T712D-AQ L826 5PB13857 COIL BEAD BI3857(AXIAL) AP31 2TM1456000 TAPE MASKING SI-602 R801 RC-2Z565KP R CARBON COMP 1/2 5.6M OHM K...
  • Page 58 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : "DAEWOOELEC" E-mail : cwhan@web.dwe.co.kr TEL : 82-2-360-7798 FAX : 82-2-360-7877...

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