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10

TROUBLESHOOTING FLOW CHART

3. AUDIO CIRCUIT

3-1. Hi-Fi model

A. TROUBLESHOOTING OF EE MODE

NO

NO

NO

NO

NO sound in the EE mode.

Is 5V supplied to pin 25,40 of

IC 251 and pin 75 of IC 301?

YES

Is signal input pin9,14 of IC 251

in the l mode?

YES

Check power circuit.

Check INPUT JACK.

Check SYSCON circuit

Change IC 251.

Is pin 36 of IC 251 mute "H"?

Is pin 36 of Ic251 mute "L"?

YES

YES

YES

Check OUTPUT JACK

Is there output at pin 53,57 of IC 251?

Is 12V supplied to pin 58 of IC 251?

YES

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Summary of Contents for DV-T1B

Page 1: ...Service Manual S M No VTG8E2AET0 Nov 2003 DAEWOO ELECTRONICS Corp http svc dwe co kr Video Cassette Recorder T7 MECHA Model DVST8E32A SN1 DVST5E32A SN1...

Page 2: ...CHEMATIC DIAGRAM Mono 17 TMI MPX SCHEMATIC DIAGRAM Hi Fi 18 TMI MPX SCHEMATIC DIAGRAM Mono 19 WAVEFORMS ON VIDEO CIRCUIT 20 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW 22 PCB MAIN 22 DISASSEMBLY 26 P...

Page 3: ...ielectric strengthen between power cord plug prongs and exposed accessible parts of the set RF terminals antenna terminals video and audio input output terminals microphone jack ear phone jacks etc is...

Page 4: ...rts Use on AC voltmeter to measure across both terminals of load Z See figure2 and following table Leakage current ratings for selected are as AC Line Voltage Region Load Z Leakage Current i Clearance...

Page 5: ...4 1 FRONT VIEWS FUNCTION DV T8D T5D T 5 DV T87 T57 DV T6A1 DV T8W T5W EXTERNAL VIEWS...

Page 6: ...5 DV T8T T5T DV T5M DV T56 DV T59 T89 EXTERNAL VIEWS...

Page 7: ...6 DV T5B T1B DV T8L T5L DV T8E T5E DV T1T EXTERNAL VIEWS...

Page 8: ...7 EXTERNAL VIEWS DV T53 F G G3 POWER REWIND REVIEW STOP EJECT FAST FORWARD CUE RECORD PLAY BACK FRONT VIDEO AUDIO INPUT JACK CHANNEL UP DOWN...

Page 9: ...8 EXTERNAL VIEWS 2 REAR VIEWS FUNCTION Hi Fi REAR VIEW 4HD 2HD MONO REAR VIEW 3 REMOTE CONTROL VR F2PD VR F2PC VR F2TG VR F2CT VR F2TH VR F2RG...

Page 10: ...on the remote control 5 Check the position of the V sync from the rising edge of the SW pulse Standard 6 5H 1 5H ITEM MODE ADJUSTMENT POINT CHECK POINT TEST EQUIPMENT TEST TAPE INPUT SIGNAL 6 5H ADJUS...

Page 11: ...ields Rotary two head helical scan with a slant double azimuth combination videohead 1 0Vp p 75ohms unbalanced 1 0Vp p 75ohms unbalanced More than 43dB SP 220 lines AUDIO Recording system Input Output...

Page 12: ...23 33 1 99 1 98 58 2 17 2 85 83 0 0 9 2 22 2 23 34 2 02 2 52 59 2 89 2 90 84 0 6 3 33 10 2 66 2 24 35 2 52 2 52 60 1 37 1 22 85 0 78 0 11 0 2 28 36 3 78 3 78 61 1 19 1 19 86 1 59 0 33 12 0 0 37 2 05...

Page 13: ...3 3 3 0 2 0 3 19 2 2 2 4 35 2 5 2 4 51 5 0 4 8 4 0 2 0 20 2 0 0 36 0 0 52 3 2 3 2 5 2 2 2 3 21 AC 2 0 0 37 1 5 1 5 53 DC1 2 5 7 6 2 2 2 4 22 AC 2 0 0 38 0 0 54 2 4 2 3 7 2 0 0 23 0 0 39 0 0 55 0 0 8...

Page 14: ...SIGNAL SIGNAL 4 5 1 0 5 1 11 1 4 1 4 5 SIGNAL SIGNAL 12 SIGNAL SIGNAL VOLTAGE CHART RESET IC IC602 BMR 0301G PHOTO COUPLER IC802 PC17 K1 PIN NO REC PB 1 5 1 5 1 2 0 0 3 5 0 5 0 PIN NO REC PB 1 5 5 2 4...

Page 15: ...14 1 POWER SUPPLY SCHEMATIC DIAGRAM VCR S A CIRCUIT DIAGRAM...

Page 16: ...15 2 SERVO SYSCON SCHEMATIC DIAGRAM VCR S A CIRCUIT DIAGRAM...

Page 17: ...16 3 VIDEO AUDIO SCHEMATIC DIAGRAM HIFI CIRCUIT DIAGRAM...

Page 18: ...17 4 VIDEO AUDIO SCHEMATIC DIAGRAM MONO CIRCUIT DIAGRAM...

Page 19: ...18 CIRCUIT DIAGRAM 5 TMI MPX SCHEMATIC DIAGRAM HIFI...

Page 20: ...19 CIRCUIT DIAGRAM 6 TMI MPX SCHEMATIC DIAGRAM MONO...

Page 21: ...NPUT 3 WAVEFORM OF THE NTSC COLOR IN THE RECORD MODE COLOR BAR INPUT Pin48 50 52 of IC301 NTSC color bar input 1 0Vp p Pin 65 of IC301 NTSC color bar output 2 0Vp p 1 2 Pin 88 89 of 94 95 IC301 NTSC S...

Page 22: ...SC COLOR IN THE PB MODE DTN 1 TEST TAPE UP Pin 70 of IC301 color rotary 5Vp p DOWN Pin 21 of IC301 ENVE 0 5Vp p Pin 46 of IC301 0 5Vp p Pin 43 of IC301 0 5Vp p Pin 05 of IC301 Video out 2 0Vp p 8 9 10...

Page 23: ...22 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW 1 PCB MAIN...

Page 24: ...512 H 3 237 75 83 25 C514 F 4 160 25 110 5 C615 E 5 131 75 137 25 C622 G 5 204 25 136 25 C702 H 5 232 75 148 25 C CHIP LOC X Y X Dimension Y Dimension C802 J 2 283 25 41 C803 J 2 283 25 35 75 C804 K 2...

Page 25: ...25 R229 G 1 184 25 15 75 R231 G 1 197 25 24 R232 G 1 198 25 28 75 R233 G 1 199 25 24 R234 G 1 200 25 28 75 R259C C 2 60 75 39 R263 C 3 87 62 R265C B 1 45 21 5 R270C B 1 45 26 5 R272 C 3 88 86 R301 G 2...

Page 26: ...17 J 4 280 117 R818 J 4 280 119 5 R820 J 4 278 75 110 75 R821 J 5 270 125 129 75 R824 K 4 304 107 75 R825 K 4 301 107 75 R826 J 4 298 75 119 5 R827 J 5 299 5 130 R828 H 5 228 25 142 5 R AXIAL LOC X Y...

Page 27: ...26 DISASSEMBLY 1 PACKING ASS Y...

Page 28: ...27 DISASSEMBLY 2 INSTRUMENT DISASSEMBLY 2 1 TOP COVER REMOVAL FIG 1 1 Remove two 2 screws holding the top cover 2 Carefully lift the back of the top cover and slide it to the rear to remove it...

Page 29: ...28 DISASSEMBLY 2 2 FRONT PANEL REMOVAL FIG 2 1 Continued from Fig 1 2 Release three 3 bottom tabs holding the front panel 3 Remove the front panel...

Page 30: ...29 DISASSEMBLY 2 3 DECK ASSEMBLY REMOVAL FIG 3 1 Remove the top cover and front panel 2 Disconnect the FPC A 3 Remove five 5 screws B 5EA 4 Pull out the Deck Assembly in the direction of the arrow...

Page 31: ...DECK ASSEMBLY REMOVAL FIG 4 1 Remove the top cover the front pane and the deck assembly 2 Remove two 2 screws A 4 Release three 3 tabs b and lift out the Main PCB in the direction of the arrow DISASS...

Page 32: ...31 DISASSEMBLY 2 5 F L DOOR REMOVAL FIG 5 1 Open the F L door 90 degrees 2 Remove the F L door in the direction of the arrow...

Page 33: ...L QUARTZ HC 49 S14 328224MHZ 30PPM C102 HCBK103KBA C CHIP CERA 50V X7R 0 01MF K 1608 C107 HCQK809DBA C CHIP CERA 50V CH 8PF D 1608 C121 HCFH104ZBA C CHIP CERA 25V Y5V 0 1MF Z 1608 C201 HCBK103KBA C CH...

Page 34: ...A V LA71730 IC601 168KT87VTS IC MICOM M37762M8A 1B9GP IC701 1PT6955 IC DRIVER PT6955 24TP LED DR R101 HRFS243JBA R CHIP 1 16 24K OHM J 1608 LOC PART CORD PART NAME PARTS DESCRIPTION REMARK R103 HRFS1...

Page 35: ...ART NAME PARTS DESCRIPTION REMARK C206 CEXF1C220A C ELECTRO 16V RSM 22MF 5X7 C208 CEXF1C220A C ELECTRO 16V RSM 22MF 5X7 C210 CEXF1C470A C ELECTRO 16V RSM 47MF 5X7 TP C212 CEXF1H479A C ELECTRO 50V RSM...

Page 36: ...68UH BLU BLK L252 5CPX680J2T COIL PEAKING 68UH BLU BLK LOC PART CORD PART NAME PARTS DESCRIPTION REMARK L301 5CPX100J2T COIL PEAKING 10UH BRN BLK L302 5CPX100J2T COIL PEAKING 10UH BRN BLK L304 5CPX10...

Page 37: ...REMARK R230 RD AZ223J R CARBON FILM 1 6 22K OHM J R253 RD AZ113J R CARBON FILM 1 6 11K OHM J R254 RD AZ563J R CARBON FILM 1 6 56K OHM J R255 RD AZ113J R CARBON FILM 1 6 11K OHM J R256 RD AZ563J R CARB...

Page 38: ...RK C829 CEXK1V471L C ELECTRO 35V 470MF KXL C830 CEXF1V221V C ELECTRO 35V RSS 220MF 10X12 5 TP D818 DSB360 DIODE SCHOTTKY SB360 H701 10RC356VF4 IC UNIT R RECE1VER ORC 356VF4 38KHZ IC603 14CAT2408P IC E...

Page 39: ...HIP CERA 25V Y5V 0 022MF Z 1608 C642 HCFH223ZBA C CHIP CERA 25V Y5V 0 022MF Z 1608 C643 HCFH223ZBA C CHIP CERA 25V Y5V 0 022MF Z 1608 C644 HCFH223ZBA C CHIP CERA 25V Y5V 0 022MF Z 1608 LOC PART CORD P...

Page 40: ...PART CORD PART NAME PARTS DESCRIPTION REMARK RJ201 HRFS000 BA R CHIP 1 16 0 OHM 1608 RJ204 HRFS000 BA R CHIP 1 16 0 OHM 1608 RJ205 HRFS000 BA R CHIP 1 16 0 OHM 1608 RJ206 HRFS000 BA R CHIP 1 16 0 OHM...

Page 41: ...TO Q205 TZTA1266Y TR KTA1266Y AUTO 1015Y Q206 TZTA1266Y TR KTA1266Y AUTO 1015Y LOC PART CORD PART NAME PARTS DESCRIPTION REMARK Q211 TZTC3198Y TRANSISTOR KTC3198Y 1815Y AUTO Q805 TZTC3205Y TR KTC3205Y...

Page 42: ...6 10K OHM F LOC PART CORD PART NAME PARTS DESCRIPTION REMARK R514 RN AZ103F R METAL FILM 1 6 10K OHM F R515 RD AZ203J R CARBON FILM 1 6 20K OHM J R516 RD AZ431J R CARBON FILM 1 6 430 OHM J R517 RD AZ...

Page 43: ......

Page 44: ...change F801 Check C801 L801 D801 D804 R802 YES YES YES YES YES YES Exchange Diode Power Cord is OK Check F801 Is 140 440V voltage obtained at C805 Check rectifier Diode of 2nd parts Switching pulse of...

Page 45: ...eck YES NO NO NO YES YES Adjust tracking Noise appears although change cassette tape YES Is CTL pulse output at pin 97 of IC 601 Playback picture is not good YES NO Check IC 601 The voltage of pin 6 o...

Page 46: ...en on the whole Noise appears on the screen at the bottom Change Drum Ass y Is Enve waveform supplied to pin 4 of PT 01 Check connector and Head dust NO NO YES Check pattern Check video circuit Adjust...

Page 47: ...HOOTING FLOW CHART C Auto stop during playback NO Is reel pulse applied to pin 79 and 80 of IC 601 Check reel sensor NO YES Is D FG applied to pin 90 of IC 601 YES Check IC 601 Check connector and D F...

Page 48: ...FLOW CHART D Drum M T loading stops NO NO Is motor 12V supplied from P603 pin2 Check D816 D821 of Line Ever 12V Check power parts NO YES YES Is D speed CTL from P603 pin12 Check R508 C514 R509 Check c...

Page 49: ...tor 26V supplied Check D820 D815 of Line Ever26V NO Is the input of pin 9 of P603 Check circuit of R511 R510 C512 YES NO Is pin 2 of P603 26V Check POWER part YES NO Does pin 77 of IC 601 supply C PWM...

Page 50: ...er cord NO YES Is ever 5V applied Check power Parts NO Does X602 crystal oscillate Check IC601 and X602 YES NO Is CAM SW SW501 DATA correct YES Recheck connector and CAM SW contact SW501 Check IC601 C...

Page 51: ...ot inserted NO YES YES YES NO L C 12V supplied P603 pin8 Check power Parts NO NO CAM Mode SW is changed when CST IN Check Sw501 or to see CAM mode table Check IC 604 Check Deck part Is Signal supplied...

Page 52: ...operate NO YES YES YES When mains is unplugged Is 5V at pin 37 of IC 601 Check E5V part NO Is sine signal applied to pin 35 and 36 of IC 601 Check X602 NO Check reset circuit of IC504 Check IC 601 1...

Page 53: ...ied to pin 25 40 of IC 251 and pin 75 of IC 301 YES Is signal input pin9 14 of IC 251 in the l mode YES Check power circuit Check INPUT JACK Check SYSCON circuit Change IC 251 Is pin 36 of IC 251 mute...

Page 54: ...C 601 NO Check the PRE AMP circuit NO NO Hi Fi sound in playback mode of Hi Fi recorded tape Is A SW PULSE input into pin27 of IC 251 YES Is the voltage of IC251 pin28 above 4 0V YES Change IC 251 Che...

Page 55: ...O NO NO Hi Fi soung in the playback mode after Hi Fi recording Check the following procedure in RECORD mode Is 5V base of Q205 YES Is there output at pin 21 of IC301 YES Check IC251 Change Drum Is the...

Page 56: ...NO NO NO sound in the normal playback mode Is 5V supplied to pin25 40 of IC 251 and pin18 of IC301 YES Is there Audio signal pin9 of IC301 YES Check A C HEAD Check IC 301 and C251 Is pin71 of IC301 0V...

Page 57: ...f Q205 Check IC 601 YES NO Is there 70kHz signal at pin 4 of P201 Is the voltage above 4 8V at collector of Q202 NO Check POWER circuit Check Power circuit Check Q201 Clean A C HEAD and connector of P...

Page 58: ...NO sound in the EE mode Is signal input pin15 of IC 301 in the l mode YES Check power circuit Check INPUT JACK Check SYSCON circuit Change IC 301 Is 0V supplied to pin 71 of IC 301 YES YES YES Check...

Page 59: ...NO Check Power circuit NO NO sound in the playback mode Is 0V supplied to pin71 of IC301 YES Is 0V Collector of Q203 YES Check Q203 Q204 Q205 Check connector of P201 YES Is 5V applied to pin 18 of IC...

Page 60: ...S NO Is there 70kHz signal at pin 4 of P201 Is the voltage above 4 8V at collector of Q202 NO Check POWER circuit Check Power circuit Check Q201 Clean A C HEAD and connector of P201 Is there output at...

Page 61: ...S Is the CLK DATA signal Input pin 68 69 ofIC301 YES YES Is signal output from pin 65 of IC301 YES Is signal input into pin 50 of IC 601 RFOUT LINE OUT NO Is 5V supplied at pin53 98 99 of IC601 Check...

Page 62: ...into IC 301 pin 46 Is the signal output From IC301 pin46 YES YES NO Does X301 crystal oscillate YES YES Is composite video signal output from IC301 pin 65 YES Check OSD circuit NO Check power circuit...

Page 63: ...l Output from IC301 pin 21 46 YES Is 5V supplied at IC301 pin91 YES Is signal input into IC301 pin48 50 52 Check Power circuit Check REC H Check IC 301 Is REC H signal supplied IC301 pin80 YES YES YES...

Page 64: ...SHOOTING OF OSD MODE NO OSD Characer incorrect Is 5V supplied at Ic601 pin 53 98 99 Check Power circuit NO Check X602 XS01 YES YES YES Does X602 XS01 crystal oscillate X601 14 3181 NTSC XS01 14 30244...

Page 65: ...or OUTPUT OF HEAD AMP SW V SW PULSE PULSE VIDEO 16 HEAD AMP SW O TO SELECT SP H D or EP H D PULSE VIDEO 17 ENVE COMP I COMPARE SP ENVE WITH SP ENVE PULSE VIDEO 18 VIDEO H SW O TO SELECT R CH or L CH V...

Page 66: ...PUT 63 REC SAFETY I REC safety tab is detected L state so that recording is inhib ited L REC SAFTY SW 64 REC H O REC MODE OUTPUT H AUDIO 65 CAM C I CAM DATA INPUT 66 CAM D I CAM DATA INPUT 67 EEPROM C...

Page 67: ...N 86 NONE 87 C FG I CASPTAN FG INPUT PULSE DECK 88 AMP VSS GND 89 NONE 90 D PG FG I DRUM PG FG INPUT PULSE DECK 91 AMP Vref out I AMP V ref out 92 AMP Vref in I AMP V ref IN 93 C 94 CTL I AC HAED CONT...

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