Daewoo DV-6T812N Service Manual Download Page 12

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TROUBLESHOOTING

3. VIDEO circuit

A. EE screen doesn’t appear

EE screen doesn’t appear.

Is Video signal input at IC301

pin#48,50,52,54?

Is 5V obtained at IC301

pin#54, 42, 55, 72?

Is signal output at IC301

pin#65?

Is signal input at IC601

pin#50?

Check LINE JACK and IF circuit.

Check DVD circuit.

Check POWER 5V.

Check IC301

pin #70,62,68,69.

YES

Check PCB Pattern.

YES

Is signal output at IC301

pin#61 or #63?

YES

Check IC301

pin #68,69,70,62

Signal output at IC301 pin#65 is

transferred to IC301 pin#56?

YES

Check PCB Pattern.

Is signal input at IC302

pin#12 or #13?

YES

Check PCB Pattern.

Is signal input at IC302

pin#14?

YES

Check IC302 pin #11

Is Y signal input at IC604

pin#6?

YES

Check PCB Pattern.

Is C-Sync signal output at

IC604 pin#3?

YES

Is 5V obtained at IC604

pin#7?

Is C-Sync signal input at

IC601 pin#58?

YES

Check PCB Pattern.

Is C-Sync signal input at IC601

pin#58?

YES

Check PCB Pattern.

Is signal output at IC601

pin# 52?

Is 5V obtained at IC601

pin#53,98,99?

YES

Check POWER circuit.

Check RF Output.

Check

Check IC 601

YES

Summary of Contents for DV-6T812N

Page 1: ...CO LTD Nov 2002 http svc dwe co kr 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 ...

Page 2: ...1 SPECIFICATIONS 2 ADVANTAGES OF THIS PRODUCT 3 TROUBLE SHOOTING 5 WAVEFORMS 23 CIRCUIT DIAGRAM 25 PCB CIRCUIT BOARD 31 INSTRUMENT DISASSEMBLY 34 ELECTRICAL PARTSLIST 40 CONTENTS ...

Page 3: ...seofDVDandVCR Audiooutputterminal 2kinds 8 8dBm VCR 2 0Vrms DVD RCAJACK AUDIOoutput DVDonly AnalogueAUDIOoutput 2CH 2 0Vrms Digitalaudiooutput COAXIAL Playabletape VeryhighdensetapeswithVHSmarks Playabledisc DVD VIDEO CD CD 12mm CD 8mm MP3 CD R CD RW Tapespeed Standard 33 35mm s 3times 11 12mm s Playtime Standard 2hrs 3times 6hrs useofT120tape Clockdisplay 12hrsAM PM TimeRecording 8programsayear P...

Page 4: ...2speakers Highbit highsamplingwith27MHz 10bitvideoencoder Thisunithas27MHz 10bitcapability thatenablesthefaithfulreproductionoffineimages Highbit highsamplingwith96KHz 24bitaudioD Aconverter Withthis96KHz 24bitlinearPulseCodeModulatedsignals whichconstitutethehighestspecificationsintheDVDstandards you canenjoyfaithfullyreproducedsoundinallofitsvariousmodes Tosupport96KHzsampling 24bitsound theshap...

Page 5: ...splayOSDin7languages ParentalLockfunction DVD Thisfunctioncanpreventplaybackofsoftwarethatmaybeunsuitableforchildren MultiAudiofunction DVD Theaudiosoundtrackcanbeheardinupto12languages InthecaseofSVCDorCVD itdependsonthedisc Thenumberofaudio languagesdependsonthesoftware MultiSubtitlefunction DVD Thesubtitlecanbeseeninupto12languages InthecaseofSVCDorCVD itdependsonthedisc Thenumberofsubtitlelang...

Page 6: ...ER cord is ok Is 200V 140V voltage obtained at C805 Output voltage of 2nd parts is normal Check rectifier diode of 2nd parts D821 D822 D823 D825 D826 D827 Switching pulse of IC801 pin 4 or pin 5 is normal OK Exchange POWER CORD Check F801 Exchange rectifier diode of 2nd parts D821 D822 D823 D825 D826 D827 Check IC801 NO YES YES YES YES YES NO NO NO NO ...

Page 7: ...n 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 IC701 YES SEG output at PORT of IC701 Exchange IC701 YES A LED DISPLAY NO ...

Page 8: ...ears on the playback screen Is noise diminished by tracking adjustment Noise band is trembled up and down Re adjust PATH IstheheightofCTLHEADnormal Nodust Is there problem in CTL Input circuit and amplifier YES NO NO NO Is there CTL pulse at IC601 pin 97 Check IC601 Noise appears on the screen even though changing tape Re adjust the height of AC HEAD Remove the dust Check C651 C652 R651 R653 IC601...

Page 9: ...se at IC601 pin 16 18 Check PCB Pattern Check IC601 C 2 Bad playback quality 2 No broadcasting signal received Is the output at IC601 pin 71 CLK 72 DATA normal Is SIF Video output at TMI RF101 pin 18 20 normal Check IC 601 Check IC301 Check IC601 YES YES NO NO NO Is Video Signal input at IC601 pin 50 Is there Video output at IC601 pin 52 Check TMI RF101 Block NO Check Video Buffer Q101 D No broadc...

Page 10: ...e obtained at Each parts of Loading Motor Replace Loading Motor Check D851 and POWER circuit E No CASSETTE Loading YES YES F AUTO STOP in Playback mode VCR stops automatically in playback mode Check R656 C659 and P603 pin 11 Check P502 connector Check S603 S604 REEL Sensor Is D PG FG pulse at IC601 pin 90 normal Is C FG pulse at IC601 pin 87 normal Is there REEL Pulse at IC601 pin 79 80 Check and ...

Page 11: ...ge obtained at P603 pin 9 Check P603 Connector and Capstan Motor Check 14V Q856 Q857 Q852 Check Capstan FG IC 601 87 Check R665 R664 R663 R666 C665 Check R661 R667 C664 DRUM Motor stops Is 13V voltage obtained at P603 pin 8 YES NO NO NO YES YES Is DRUM PWM fit to IC 601 pin 76 Is 1 2V voltage obtained at P603 pin 12 Check Capstan Motor and DRUM Motor Check ON OFF 13V D851 Q856 Check DRUM PG FG IC ...

Page 12: ...C301 pin 68 69 70 62 Signal output at IC301 pin 65 is transferred to IC301 pin 56 YES NO Check PCB Pattern Is signal input at IC302 pin 12 or 13 YES NO Check PCB Pattern Is signal input at IC302 pin 14 YES NO Check IC302 pin 11 Is Y signal input at IC604 pin 6 YES NO Check PCB Pattern Is C Sync signal output at IC604 pin 3 YES NO Is 5V obtained at IC604 pin 7 Is C Sync signal input at IC601 pin 58...

Page 13: ...ppear Is Envelope output at IC301 pin 79 NO NO YES Check Sync separate circuit and OSD circuit Is 5V obtained at IC301 pin 91 Is SW Pulse input at IC301 pin 70 Is 5V obtained at IC301 pin 21 57 Check POWER 5V Check IC601 pin 18 Check and Replace HEAD Check POWER 5V YES NO NO Does X301 3 58MHz oscillate Check Pattern NO NO NO YES NO NO YES YES YES YES Replace X301 Is Video signal output at IC301 pi...

Page 14: ... 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 Check POWER circuit Check PB H circuit Check IC601 pin 18 No recording Check EE MODE YES Is FM signal output at IC301 pin 78 Replace IC301 NO NO YES C No recording ...

Page 15: ...o IC101 pin 2 Is AUDIO output at IC101 pin 26 27 Check IC251 pin 2 3 Check POWER circuit Exchange X101 Check RF101 Exchange IC101 NO 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 Replace IC601 D No OSD On Screen Display appears YES YES NO Check IC 601 Check IC 601 ...

Page 16: ...eo YES YES Remark previous 3 A NO Check Q103 Q104 Q105 Check FFC CABLE DVD Module No COMPONENT signal at JK102 Is signal output at P101 pin 19 20 21 Is signal output at emitter of Q103 Q104 Q105 NO YES YES NO Check Q106 Q107 Check FFC CABLE DVD Module No S VIDEO signal at JK104 Is signal output at P101 pin 15 17 Is signal output at emitter of Q106 Q107 NO YES YES ...

Page 17: ... 21is L Is about 3 5V obtained at IC252 pin 9 Is about 8V obtained at pin 10 YES Check IC601 Check R298 R299 R646 R647 NO NO C at Q258 is L or H YES Check IC601 Check Output JACK H H L YES Is Audio signal output at IC251 pin 19 20 Are CLK and DATA obtained at IC251 pin 42 43 NO Is 5V obtained at IC251 pin 40 Is there Audio at IC251 pin 2 3 in RF mode Check IC101 and RF101 Block Ad2 NO Replace IC25...

Page 18: ... IC252 pin 9 Is about 8V obtained at pin 10 YES Replace IC252 Check IC601 Check R298 R299 R646 R647 NO NO NO C at Q258 is L or H YES Check IC601 Check Output JACK Check Q257 Q258 R2 40 R241 R242 H H L L YES YES No sound in LINE1 E E mode Is 12V obtained at IC251 pin 34 NO Is 5V obtained at IC251 pin 40 Check POWER circuit YES NO Are CLK and DATA obtained at IC251 pin 42 43 Check Input LINE1 JACK R...

Page 19: ...dio signal output at IC252 pin 3 13 Check POWER circuit NO YES NO IC601 pin 20 is H pin21 is H Is about 8V obtained at IC252 pin 9 Is about 8V obtained at pin 10 Replace IC252 Check IC601 Check R298 R299 R646 R647 NO NO C at Q258 is L or H YES Check IC601 Check Output JACK Check Q257 Q258 R2 40 R241 R242 H H L L YES YES YES A c LINE2 E E No sound in LINE2 E E mode ...

Page 20: ... at ICD04 pin 1 7 C of Q258 is L or H YES YES Is DVD signal output at IC252 pin 3 13 Check ICD04 NO YES YES H Check Mute circuit Check Output JACK L IC601 pin 20 is L pin 21is H Check IC601 NO Is about 8V obtained at IC252 pin 9 Is about 3 5V obtained at pin 10 Check R298 R299 R646 R647 NO Check DVD module Replace IC252 NO Check POWER circuit NO NO ...

Page 21: ...O Is thereAudio at IC252 pin 5 14 Replace IC251 NO Check power circuit NO YES YES Is the voltage at IC251 pin 44 over 3 2V C at Q258 is L or H Check MUTE circuit H L YES YES YES Check Output JACK B No Hi Fi playback audio PLAY MODE Is A SW Signal input at IC251 pin 41 Check DRUM connector and DRUM NO Is about 3 5V obtained at IC252 pin 9 Is about 8V obtained at pin 10 Check R298 R299 R646 R647 NO ...

Page 22: ...at IC301 pin 2 Check IC601 pin 22 c No HIFI playback in record playback mode REC MODE YES YES Replace DRUM NO HEAD CLEANING YES D No NORMAL AUDIO playback PLAY MODE Is Playback Audio signal at IC301 pin 11 Check R298 R299 R646 R647 YES NO NO Is about 3 5V obtained at IC252 pin 9 Is about 8V obtained at pin 10 Check A C HEAD and IC301 YES Replace IC252 YES Is there signal at IC252 pin 3 13 NO Check...

Page 23: ...l Is there recording signal at IC251 pin 21 Check IC101 MPX Block Check Input LINE1 JACK Check Input LINE2 JACK Check ICD02 DVD Block Check signal flow circuit YES NO NO NO Signal at IC251 pin 21 is transferred to IC301 pin 13 15 17 Collect signal at Q203 is about 70Vp p at 70KHz Check IC251 YES YES Check Q202 NO Check P202 pin 2 4 8 and A C HEAD YES REC H BASE voltage at Q201 is 5V Check IC601 pi...

Page 24: ...MS 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 25: ...24 WAVEFORMS 15 9 P201 2 2 AUDIO 2 1 AUDIO Mono 2 2 AUDIO HI Fl Q901 collector ...

Page 26: ...C601 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 REC PLAY IC601 87 2 5Vp p 1V 0 2msec cm REC PLAY 3 SERVO SYSCON ...

Page 27: ...26 CIRCUIT DIAGRAM 1 POWER SUPPLY SCHEMATIC DIAGRAM DVD COMBO FREE ...

Page 28: ...27 CIRCUIT DIAGRAM 2 VIDEO AUDIO SCHEMATIC DIAGRAM HI FI ...

Page 29: ...28 CIRCUIT DIAGRAM 3 SERVO SYSCON SCHEMATIC DIAGRAM ...

Page 30: ...29 4 DIGITAL AUDIO SCHEMATIC DIAGRAM CIRCUIT DIAGRAM ...

Page 31: ...30 CIRCUIT DIAGRAM 5 HI FI SW CIRCUIT DIAGRAM ...

Page 32: ...31 CIRCUIT DIAGRAM 6 INPUT OUTPUT SCHEMATIC DIAGRAM ...

Page 33: ...32 PCB CIRCUIT BOARD 1 1 VCR MAIN ...

Page 34: ...33 PCB CIRCUIT BOARD 1 2 POWER ...

Page 35: ...34 PCB CIRCUIT BOARD 1 3 LOGIC ...

Page 36: ...s 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 Remove 2 screws then remove LEG Remove two screws Remove three screws Remove two screws 35 ...

Page 37: ...NEL FRONT DISASSEMBLY D LOGIC PCB DISASSEMBLY FIG 3 FIG 4 Remove 3 Hooks at bottom Remove 2 Hooks at left and right sides Simultaneously remove panel Remove 7 Hooks then remove Logic PCB INSTRUMENT DISASSEMBLY ...

Page 38: ...37 INSTRUMENT DISASSEMBLY FIG 5 E DECK AND MAIN PARTS DISASSEMBLY Remove 6 screws then remove DECK Remove 4 screws then remove LOADER Remove 3 screws then remove POWER PCB ...

Page 39: ...38 INSTRUMENT DISASSEMBLY FIG 6 F MAIN PCB DISASSEMBLY Remove 1 screws then remove MAIN PCB Remove 3 screws ...

Page 40: ...39 INSTRUMENT DISASSEMBLY G MAIN CHASSIS DISASSEMBLY FIG 7 Remove 6 screws then remove MAIN CHASSIS ...

Page 41: ...40 INSTRUMENT DISASSEMBLY H Explode view ...

Page 42: ...K C220 HCBK391KBA CCHIPCERA 50VX7R390PFK1608 C246 HCBK122KBA CCHIPCERA 50VX7R1200PFK1608 C247 HCBK122KBA CCHIPCERA 50VX7R1200PFK1608 C253 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C254 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C255 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C256 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C257 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C258 HCFH474ZCA CCHIPCERA 25VY5V0 47MFZ2012 C26...

Page 43: ...75OHMJ1608 R133 HRFS102JBA RCHIP 1 16 1KOHMJ1608 R138 HRFS750JBA RCHIP 1 1675OHMJ1608 R201 HRFS752JBA RCHIP 1 167 5KOHMJ1608 R202 HRFS113JBA RCHIP 1 16 11KOHMJ1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R203 HRFS334JBA RCHIP 1 16 330KOHMJ1608 R204 HRFS201JBA RCHIP 1 16 200OHMJ1608 R205 HRFS303JBA RCHIP 1 1630KOHMJ1608 R207 HRFS223JBA RCHIP 1 16 22KOHMJ1608 R208 HRFS222JBA RCHIP 1 16 2 2KOHMJ...

Page 44: ...S332JBA RCHIP 1 16 3 3KOHMJ1608 R652 HRFT131JCA RCHIP 1 10130OHMJ2012 R653 HRFT131JCA RCHIP 1 10130OHMJ2012 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R654 HRFS103JBA RCHIP 1 16 10KOHMJ1608 R655 HRFS103JBA RCHIP 1 16 10KOHMJ1608 R656 HRFS102JBA RCHIP 1 16 1KOHMJ1608 R657 HRFS103JBA RCHIP 1 16 10KOHMJ1608 R658 HRFS473JBA RCHIP 1 16 47KOHMJ1608 R659 HRFS122JBA RCHIP 1 16 1 2KOHMJ1608 R660 HRFS203J...

Page 45: ...MF6 3 7 C298 CEXF1E470A CELECTRO 25VRSM47MF6 3 7 C299 CEXF1C100A CELECTRO 16VRSM10MF5X7 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C303 CEXF1H109A CELECTRO 50VRSM1MF 4X7 TP C304 CEXF1H109A CELECTRO 50VRSM1MF 4X7 TP C306 CEXF1A101A CELECTRO 10VRSM100MF6 3X7 C309 CEXF1H109A CELECTRO 50VRSM1MF 4X7 TP C312 CEXF1H109A CELECTRO 50VRSM1MF 4X7 TP C317 CEXF1A101A CELECTRO 10VRSM100MF6 3X7 C318 CEXF1H109A...

Page 46: ...EMASKING SI 602 AM31A 2TM110620R TAPEMASKING SI 600NRED AM31B 2TM1106200 TAPEMASKING SI 600N C102 CBZP1C103M CCERASEMI 16VY5S0 01MFM AXIAL LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C103 CBZP1C103M CCERASEMI 16VY5S0 01MFM AXIAL C106 CBZF1E223Z CCERASEMI 25VY5V0 022MFZ C128 CCZF1H104Z CCERA HIKF50V0 1MFZAXIAL C131 CCZF1H104Z CCERA HIKF50V0 1MFZAXIAL C146 CCZF1H104Z CCERA HIKF50V0 1MFZAXIAL C150 C...

Page 47: ...R665 RN AZ103F RMETALFILM 1 610KOHMF R666 RD AZ912J RCARBONFILM 1 69 1KOHMJ LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R851 RD 4Z123J RCARBONFILM 1 412KOHMJ R852 RD 4Z123J RCARBONFILM 1 412KOHMJ R853 RD 4Z201J RCARBONFILM 1 4200OHMJ R856 RD AZ103J RCARBONFILM 1 610KOHMJ R857 RD 4Z751J RCARBONFILM 1 4750OHMJ RD11 RD AZ303J RCARBONFILM 1 630KOHMJ RD43 RD AZ103J RCARBONFILM 1 610KOHMJ RD45 RD AZ821...

Page 48: ... CEXK1A471L CELECTRO 10V470UFKXL C828 CEXF1E221V CELECTRO 25VRSS220MF 8X11 5 TP C829 CEXF1E221V CELECTRO 25VRSS220MF 8X11 5 TP LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C830 CEXF1E221V CELECTRO 25VRSS220MF 8X11 5 TP C831 CMXL1J104K CMYLAR MEU63V0 1MFK C833 CEXF1E221V CELECTRO 25VRSS220MF 8X11 5 TP C834 CEXF1H330V CELECTRO 50VRSS33MF 6 3X11 TP F801 5FWPS2022L FUSEPLASTICTUBE WRL2A250VTLLT 5 SR 5...

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