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Daewoo DV6T112D Service Manual - Specifications

Summary of DV6T112D

  • Page 1

    S/m no. : vtb712det0 service manual model: dv6t712d / dv6t112d dv6t712p / dv6t112p dv6t712s / dv6t112s dv6t722d dv6t722p dv6t722s daewoo electronics co., ltd. Nov. 2002 http : //svc.Dwe.Co.Kr vcr dvd repeat open/close display title/pbc menu pr pr output prev rec program clk/cnt speed/angle tracking ...

  • Page 2: Contents

    1 specifications ...........................................................................................................2 advantages of this product ...............................................................................3 trouble shooting ....................................................

  • Page 3: Specifications

    2 specifications dvd audio output standards 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...

  • Page 4: Advantages of This Product

    Advantages of this product 3 • 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) • simple...

  • Page 5

    4 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 • repeat play...

  • Page 6: Troubleshooting

    5 troubleshooting 1. Power circuit ✓ caution you must use insulated trance during the first part test of power circuit. Check ic601,ic701. No power power cord is ok? Is 400~200v voltage obtained at c805 +? Output voltage of 2 nd parts is normal? Check rectifier diode of 2 nd parts ; d821, d822, d823...

  • Page 7: 2. System Circuit

    2. System circuit 6 troubleshooting no led display. Is 5v obtained at ic701 pin #9, 25? Oscillation at ic701 pin #1? Specific grid/seg doesn’t function. Check r705, l601. Exchange ic701. Check ic 701 pin #22~24, 27, 28, 30, 31. Check ic 701 pin #10~12, 14~21. No yes yes no no grid output at port of ...

  • Page 8

    7 troubleshooting no power compensation. Voltage of power fail (ic601 pin#3) at micom is 0.7v over? More than 3.2v is maintained for 1 minutes at ic601 pin#37 during power cord open. Check r644. No yes b. No power compensation. Yes check reset circuit. No exchange ic601..

  • Page 9

    8 troubleshooting noise appears on the playback screen. Is noise diminished by tracking adjustment. Noise band is trembled up and down? Re-adjust path. Is the height of ctl head normal? No dust? Is there problem in ctl input circuit and amplifier. Yes no no no is there ctl pulse at ic601 pin#97? Che...

  • Page 10

    9 troubleshooting noise appears on the full playback screen. Are sw pulse and ha sw normal? Recheck step c-1 (bad playback quallty (1)). Check head amp connector and head. Yes yes no no enve wave at pt01 pin #4? Check video circuit. Are there sw, ha sw pulse at ic601 pin #16, 18? Check pcb pattern. ...

  • Page 11

    10 troubleshooting cassette tape isn’t inserted. Is 5v voltage obtained at loading parts ic601 pin#82? Is 13v voltage obtained at capstan motor pin#8? Check at on/off 12. Check (d822, q851). Connect capstan and loading motor. Check connector and capstan motor. Yes no no no is 12v voltage obtained at...

  • Page 12

    11 troubleshooting g. Drum motor stops h. Capstan doesn’t rotate capstan doesn’t rotate. Is 14v voltage obtained at p603 pin#2? Yes no no no yes yes is capstan pwm fit to ic 601 pin#77? Is 3.2v voltage obtained at p603 pin#5? Is 2~3v voltage obtained at p603 pin#9? Check p603 connector and capstan m...

  • Page 13: 3. Video Circuit

    12 troubleshooting 3. Video circuit ee screen doesn’t appear. Is video signal input at ic301 pin#48,50,52,54? Is 5v obtained at ic301 pin#24, 42, 55, 72, 91? Is signal input at ic302 pin#1,5,12,13,14,15? Check line jack and if circuit. Check dvd circuit. Check power 5v. Check line jack and if circui...

  • Page 14

    13 troubleshooting b. Playback picture doesn’t appear yes yes is y signal output at ic301 pin#46? Is y signal input at ic301 pin#43? Is video signal output at ic302 pin#3? Check and replace ic301. Check pcb pattern. Playback picture doesn’t appear. Is envelope output at ic301 pin#79? No no yes is vi...

  • Page 15

    14 troubleshooting is 5v obtained at ic301 pin#91? Yes no no no yes yes is ic301 pin#80 rec(h) high? Is video sw pulse input at ic301 pin#70? Is rec signal input at ic301 pin#94, 95, 89, 90? Ep mode: 89, 90 pin sp mode: 94,95pin check head and connector. Is signal input at ic301 pin# 48, 50, 52, 54?...

  • Page 16

    15 troubleshooting no is video signal input at ic601 pin#50? Check power circuit. No osd appears. Is 5v obtained at ic601 pin# 53, 98, 99? Is video signal output at ic601 pin#52? No check ic 301. D. No osd(on screen display) appears yes yes no check ic 601. Check ic 601..

  • Page 17: 4. Audio (Hi-Fi Model)

    16 troubleshooting 4. Audio (hi-fi model) no sound in rf e-e mode is there audio at ic252 pin#4,11? Ic601 pin#27 a.Mute is l or h? A. No sound in e-e mode a. A.Rf e-e no check ic121, rf101 block. Is 12v obtained at ic252 pin#16? Is rf audio signal output at ic252 pin#3,13? Check power circuit. No ye...

  • Page 18

    17 troubleshooting is there audio ic252 pin#2,15? Ic601 pin#27 a.Mute is l or h? A. B. Av1 e-e yes no check input jack. Is 12v obtained at ic252 pin 16? Is rf audio signal output at ic252 pin#3,13? Check power circuit. Yes no ic601 pin#31 is h, pin#21is l? Is about 8v obtained at ic252 pin#9? Is abo...

  • Page 19

    18 troubleshooting is there audio at ic252 pin#1,12? Ic601 pin#27 a.Mute is l or h? No check signal flow circuit from ic251 to ic252. Is 12v obtained at ic252 pin#16? Is av2 audio signal output at ic252 pin#3,13? Check power circuit. No yes no ic601 pin#31 is l? Pin# 21 is l? Is about 3.5v obtained ...

  • Page 20

    19 troubleshooting no sound in av-f e-e mode is there audio at ic253 pin#2,12 in av-f mode? Is av-f audio signal output at ic253 pin#14,15? Is there av-f audio at ic252 pin#5,14? Is 12v obtained at ic253 pin#16? Yes ic601 pin#27 a.Mute is l or h? Check power circuit. A.D. Av-f e-e yes no no no check...

  • Page 21

    20 troubleshooting a. C. Dvd e-e no sound in dvd e-e mode. Is there audio at ic253 pin#1,13 in dvd mode? Is dvd audio signal output at ic253 pin#14,15? Is there dvd auido at ic252 pin#5,14? Is 12v obtained at ic253 pin#16? Yes ic601 pin#27 a.Mute is l or h? Check power circuit yes no no no check sig...

  • Page 22

    21 troubleshooting is playback audio signal output at ic252 pin#3,13? Is 12v obtained at ic252 pin#16? Replace ic252. No ic601 pin#31 is l, pin#21 is l? Check ic601. No is there playback audio signal at ic251 pin#16,17? Replace ic251. No is there audio at ic252 pin#1,12? Check signal flow circuit fr...

  • Page 23

    22 troubleshooting no hi-fi audio in record/playback mode ic251 pin#2, 3, ic251 pin#6, 7, ic251 pin#10, 11, ic251 pin#4,5 ic251 pin#8, 9. Is there audio signal? Rec ‘h’ base voltage at q201 is 5v? Check input av1 jack. Check input av-f jack. Check icd03(dvd) block. Check input av2 jack. Replace ic25...

  • Page 24

    23 troubleshooting e. No normal audio playback (play mode) no normal audio in playback mode is there playback audio signal at ic301 pin#11? Check r646,r647,r911,r913 yes no no is about 3.5v obtained at ic252 pin#9, 10? Check a/c head. Check ic301. Yes replace ic252. Yes is there siganl at ic252 pin#...

  • Page 25

    24 troubleshooting f. No normal auido in record/playback mode(check in rec mode) no normal audio in record/playback mode is there recording signal at ic251 pin#21? Check signal flow circuit. Yes no no signal at ic251 pin#21 is transferred to ic301 pin#13,15,17? Collect signal at q203 is 70khz, about...

  • Page 26: Waveforms

    25 waveforms 1. Video 480 8 4 4 sp ic301-88.89 3.0vp-p ep ic301-94.95 2.2 vp-p 1v/10msec/cm rec 6 6 (ic604-3) ic301 63 or 61 & ic302 14 ic301 63 or 61 & ic302 14 (ic301 -70) 0.5/5msec/cm sp play/rec (ic301 -70) 0.5/5msec/cm ep play/rec.

  • Page 27

    26 waveforms 15 9 p201-2 2. Audio 2-1 audio(mono).

  • Page 28

    27 waveforms 2-2 audio(hi-fl) q901-collector (ic601-38) 2.6vp-p 0.5v/0.1 µ sec/cm rec/play (ic601-18) 5vp-p 2v/5msec/cm rec/play (ic601-77) 5vp-p sec/cm rec/play (ic601-76) 5vp-p sec/cm rec/play (ic601-94) 3vp-p 1v/5msec/cm rec (ic601-97) 4.4vp-p 1v/5msec/cm play (ic601-90) 25vp-p&5vp-p 1v/5msec/cm ...

  • Page 29

    28 circuit diagram 1. Power supply schematic diagram (pal combo).

  • Page 30

    29 circuit diagram 2. Av circuit diagram.

  • Page 31

    30 3. Servo & syscon schematic diagram circuit diagram.

  • Page 32

    31 4. Digital audio schematic diagram circuit diagram.

  • Page 33

    32 5. Hi fi & sw circuit diagram circuit diagram.

  • Page 34

    33 circuit diagram 6. If/mpx/pdc/input-output schematic diagram.

  • Page 35

    34 pcb circuit board 1-1 . Vcr (main).

  • Page 36

    35 pcb circuit board 1-2. Power.

  • Page 37

    36 pcb circuit board 1-3. Logic.

  • Page 38: Instrument Disassembly

    37 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. Fig. 1 fig. 2 a. Leg removal b. Top cover removal.

  • Page 39

    38 instrument disassembly fig. 3 c. Panel front disassembly.

  • Page 40

    39 instrument disassembly fig. 4 d. Logic pcb disassembly.

  • Page 41

    40 instrument disassembly fig. 5 e. Deck and main parts disassembly.

  • Page 42

    41 instrument disassembly fig. 6 f. Main pcb disassembly.

  • Page 43

    42 instrument disassembly fig. 7 g. Main chassis disassembly.

  • Page 44

    43 instrument disassembly fig. 8.

  • Page 45: Electrical Partslist

    44 electrical partslist loc parts_code parts_name parts_descr remark 03 pvmcase200 chassis main as dv6t712d-aq a001 97p0612300 chassis main hi-ps a0011 97p0800602 leg plastomer a0012 97p4219300 cushion leg eva a0013 97q0804201 leg-b hi-ps bk a0014 7174301011 screw tapptite tt2 rnd 3x10 mfzn a002 97p...

  • Page 46

    45 electrical partslist loc parts_code parts_name parts_descr remark c184 hcfh223zba c chip cera 25v y5v 0.022mf z 1608 hi-fi c184 hcbk122kba c chip cera 50v x7r 1200pf k 1608 mono c185 hcfh223zba c chip cera 25v y5v 0.022mf z 1608 hi-fi c185 hcbk122kba c chip cera 50v x7r 1200pf k 1608 mono c186 hc...

  • Page 47

    Loc parts_code parts_name parts_descr remark ic141 1lc74793 ic vps lc74793jm hi-fi ic251 1tda9605h- ic hi-fi tda9605h hi-fi ic252 1cd4052bcm ic chip sw cd4052bcm ic253 1cd4053bcm ic chip sw cd4053bcm ic255 1cd4053bcm ic chip sw cd4053bcm mono ic301 1la71750m- ic a/v 1 chip la71750m ic302 1cd4051bcd ...

  • Page 48

    47 electrical partslist loc parts_code parts_name parts_descr remark r379 hrfs202jba r chip 1/16 2k ohm j 1608 r381 hrfs202jba r chip 1/16 2k ohm j 1608 r383 hrfs202jba r chip 1/16 2k ohm j 1608 r386 hrfs102jba r chip 1/16 1k ohm j 1608 r390 hrfs102jba r chip 1/16 1k ohm j 1608 r603 hrfs104jba r chi...

  • Page 49

    Loc parts_code parts_name parts_descr remark rj034 hrfs000-ba r chip 1/16 0 ohm 1608 mono rj035 hrfs000-ba r chip 1/16 0 ohm 1608 mono rj036 hrfs102jba r chip 1/16 1k ohm j 1608 mono rj037 hrfs000-ba r chip 1/16 0 ohm 1608 mono rj038 hrfs000-ba r chip 1/16 0 ohm 1608 mono rj039 hrfs000-ba r chip 1/1...

  • Page 50

    49 electrical partslist loc parts_code parts_name parts_descr remark c373 cmxm2a222j c mylar 100v 2200pf j (tp) secam c374 cmxm2a222j c mylar 100v 2200pf j (tp) secam c375 cexf1h229a c electro 50v rsm 2.2mf (4x7) tp secam c380 cexf1c470a c electro 16v rsm 47mf (5x7) tp c382 cexf1c100a c electro 16v ...

  • Page 51

    50 electrical partslist loc parts_code parts_name parts_descr remark q901 tztc3198y- transistor ktc3198y-(1815y) (auto) pal q902 tztc3198y- transistor ktc3198y-(1815y) (auto) pal q903 tztc3198y- transistor ktc3198y-(1815y) (auto) pal q905 tztc3198y- transistor ktc3198y-(1815y) (auto) q907 tztc3198y-...

  • Page 52

    51 electrical partslist loc parts_code parts_name parts_descr remark l166 85801060ta wire copper 0.6x52mm taping l307 85801060ta wire copper 0.6x52mm taping l601 5cpz101k02 coil peaking 100uh k (axial 3.5mm) ls02 85801060ta wire copper 0.6x52mm taping r101 rd-az221j- r carbon film 1/6 220 ohm j r102...

  • Page 53

    52 electrical partslist loc parts_code parts_name parts_descr remark r654 rd-az103j- r carbon film 1/6 10k ohm j r656 rd-az102j- r carbon film 1/6 1k ohm j r657 rd-az103j- r carbon film 1/6 10k ohm j r658 rd-az473j- r carbon film 1/6 47k ohm j r659 rd-az122j- r carbon film 1/6 1.2k ohm j r660 rd-az2...

  • Page 54

    53 electrical partslist loc parts_code parts_name parts_descr remark jp064 85801065gy wire copper awg22 1/0.65 tin coating jp065 85801065gy wire copper awg22 1/0.65 tin coating jp066 85801065gy wire copper awg22 1/0.65 tin coating jp067 85801065gy wire copper awg22 1/0.65 tin coating jp068 85801065g...

  • Page 55

    Loc parts_code parts_name parts_descr remark jp201 85801065gy wire copper awg22 1/0.65 tin coating jp202 85801065gy wire copper awg22 1/0.65 tin coating jp204 85801065gy wire copper awg22 1/0.65 tin coating jp205 85801065gy wire copper awg22 1/0.65 tin coating jp206 85801065gy wire copper awg22 1/0....

  • Page 56

    55 loc parts_code parts_name parts_descr remark rj702 hrfs102jba r chip 1/16 1k ohm j 1608 rj703 hrfs102jba r chip 1/16 1k ohm j 1608 z0032 pvlajre200 pcb logic radial as dv6t712d-aq c701 cexf1c470a c electro 16v rsm 47mf (5x7) tp c703 cexf1c470a c electro 16v rsm 47mf (5x7) tp sw701 5s50101z90 sw t...

  • Page 57

    56 electrical partslist loc parts_code parts_name parts_descr remark l821 56c220k695 coil choke(cap type) 22uh k (cap type) 9x11.1 l822 56c220k695 coil choke(cap type) 22uh k (cap type) 9x11.1 l823 56c220k695 coil choke(cap type) 22uh k (cap type) 9x11.1 l824 56c220k695 coil choke(cap type) 22uh k (...

  • Page 58

    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 daewoo electronics co., ltd..