Daewoo DV-T8T2NZ-QB/M Service Manual Download Page 46

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TROUBLESHOOTING GUIDES

Is the output at pin
of IC301?

Check the R252, C212 of Output Jack

Is 5V applied to pin
of IC301?

Is 0V applied to the
pin of IC301?

Is the collector of Q203 0V?

Check Pin , of P201

Check power circuit

Check IC601

Check Q203, Q204, Q205

YES

No sound in the playback mode.

Appendix

Summary of Contents for DV-T8T2NZ-QB/M

Page 1: ...M DV T5T2NZ QB M ALLT MECHA Hi Fi MONO 1 2 3 4 5 6 7 8 9 0 L R DV T5T2 DV T8T2 VR F2PB Caution In this Manual some parts can be changed for improving their performance without notice in the parts list...

Page 2: ...SCHEMATIC DIAGRAM 2 4 HEAD 8 VIDEO AUDIO SCHEMATIC DIAGRAM Hi Fi 9 PIF SCHEMATIC DIAGRAM 2 4 HEAD 10 PIF MPX SCHEMATIC DIAGRAM Hi Fi 11 WAVEFORMS 12 INSTRUMENT DISASSEMBLY 16 ELECTRICAL PARTS LIST 21...

Page 3: ...scan Luma FM recording Chroma converted subcarrier phase shifted recording Two audio record playback heads Rotary helical scan 2 channels FM recording 4 head Four video record playback heads Rotary h...

Page 4: ...0 3 0 3 59 4 9 4 9 84 0 78 0 8 10 5 0 5 0 35 2 0 1 75 60 3 39 3 8 85 0 79 0 8 11 4 9 0 36 0 9 0 97 61 3 8 3 88 86 0 0 12 0 0 37 1 45 1 56 62 2 5 2 59 87 5 2 5 2 13 0 37 0 3 38 2 58 2 55 63 2 1 2 0 88...

Page 5: ...3 19 2 49 2 53 35 0 2 5 51 4 99 5 0 4 0 0 20 2 55 0 4 36 0 0 52 3 3 3 38 5 2 2 2 24 21 2 53 0 37 1 64 1 6 53 5 83 5 95 6 2 49 2 5 22 2 54 0 68 38 0 0 54 2 3 2 34 7 2 0 2 0 23 0 5 0 39 0 0 0 55 0 0 8 0...

Page 6: ...2 0 4 4 7 0 0 12 4 9 5 0 17 2 3 2 38 3 5 1 5 1 4 8 0 0 13 0 0 18 0 1 0 2 4 4 65 4 3 9 4 8 4 8 14 32 8 32 75 19 1 68 1 7 5 1 41 1 41 10 4 7 4 74 15 0 0 20 1 58 1 5 VOLTAGE CHART RESET IC IC602 BMR 0301...

Page 7: ...6 CIRCUIT DIAGRAM 1 POWER SUPPLY SCHEMATIC DIAGRAM...

Page 8: ...7 CIRCUIT DIAGRAM 2 SERVO SYSCON CEC CIRCUIT DIAGRAM T DECK...

Page 9: ...8 CIRCUIT DIAGRAM 3 VIDEO AUDIO SCHEMATIC DIAGRAM 4 HEAD...

Page 10: ...9 CIRCUIT DIAGRAM 4 VIDEO AUDIO SCHEMATIC DIAGRAM HI FI...

Page 11: ...10 CIRCUIT DIAGRAM 5 PIF SCHEMATIC DIAGRAM 4 HEAD...

Page 12: ...11 CIRCUIT DIAGRAM 6 PIF MPX SCHEMATIC DIAGRAM HI FI...

Page 13: ...01 74 380mVp p 200mV 5u s cm PLAY IC301 21 500mVp p 200mV 10u sec cm PLAY IC301 44 150mVp p 50mV 10u sec cm PLAY IC301 34 5 2Vp p 2V 5msec cm Picture search 2 5 7 9 3 IC301 25 500mVp p 200mV 10u sec c...

Page 14: ...m REC PLAY 10 IC301 76 100mVp p 20mV 0 5msec cm REC IC301 100 120mVp p 50mV 0 5msec cm PLAY 11 15 IC301 96 1 5Vp p 0 5V 0 5msec cm REC T201 5 65Vp p 10V 20u sec cm REC 12 16 IC301 98 0 45Vp p 0 2V 0 5...

Page 15: ...C601 38 4 8Vp p 1V 0 05u sec cm REC PLAY 18 22 26 IC601 77 5 5Vp p 2V 0 2u sec cm REC PLAY IC601 89 1 3Vp p 0 5V 0 5m sec cm REC PLAY 19 23 IC601 76 5Vp p 2V 0 2u sec cm REC PLAY 20 IC601 90 2Vp p 0 5...

Page 16: ...9 14 0 8Vp p 0 2V 0 5msec EE REC PLAY IC251 35 0 75Vp p 0 2V 0 5msec EE REC 27 31 IC251 16 0 75Vp p 0 2V 0 5msec EE REC IC251 53 57 0 9Vp p 0 2V 0 5msec EE REC 28 32 IC251 21 0 3Vp p 0 1V 1msec REC 2...

Page 17: ...presented When reassembling use the reverse procedure Make sure that all leads wiring are routed correctly when reassembling 1 Top Cover Removal Fig 1 1 Remove two 2 screws Holding the top cover 2 Ca...

Page 18: ...17 INSTRUMENT DISASSEMBLY 2 Front Panel Removal Fig 2 1 Continued from Fig 1 2 Release seven 7 tabs holding the front panel Release bottom tabs first 3 Remove the front panel...

Page 19: ...ISASSEMBLY 3 Deck Assembly Removal Fig 3 1 Remove the top cover the front panel 2 Disconnect the FPC 3 Remove five 5 screws A B C D E 4 Remove one 1 screw F 5 Pull out the Deck Assembly in the directi...

Page 20: ...EMBLY 4 Main PCB Assembly Removal Fig 4 1 Remove the top cover the front panel the bottom cover and the deck assembly 2 Remove two 2 screws 3 Release three 3 tabs A and lift out the Main PCB in the di...

Page 21: ...20 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 INSTRUMENT DISASSEMBLY...

Page 22: ...LS02 5CPX680J2T COIL PEAKING 68UH BLU BLK COMM M01 97PP322901 PANEL FRONT AS T5T2NZ QB M COMM P201 97P62Y1318 CONN WAFER DVW250 PLUG 2 5MM 8P COMM P202 97P62T14B2 CONN HOUSING TMC EX B1 RECEP 2 0MM 2P...

Page 23: ...ESC REMARK C309 CEXF1C100A C ELECTRO 16V RSM 10MF 4X7 COMM C310 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP COMM C311 HCFK103ZCA C CHIP CERA 50V Y5V 0 01MF Z 2012 COMM C312 CCZF1C105Z C CERA AXIAL HIKF...

Page 24: ...O 52MM COMM D713 DZN4148 DIODE 1N4148 AUTO 52MM COMM D714 DZN4148 DIODE 1N4148 AUTO 52MM COMM LOC PART CODE PART NAME PART DESC REMARK D801 DS1WBA60 C DIODE BRIDGE S1WBA60 4072 CHIP COMM D802 DZUZ18BS...

Page 25: ...MM LOC PART CODE PART NAME PART DESC REMARK R802 RW02B229J R WIRE WOUND 2W 2 2 OHM J COMM R803 RD 4Z224JS R CARBON FILM 1 4 220K OHM J SMALL COMM R804 RD 4Z224JS R CARBON FILM 1 4 220K OHM J SMALL COM...

Page 26: ...UTO 52MM HIFI IC251 1AN3662 IC HIFI AN3662 HIFI JP146 RD AZ102J R CARBON FILM 1 6 1K OHM J HIFI LOC PART CODE PART NAME PART DESC REMARK JP232 CCZF1H104Z C CERA 50V HIKF 0 1MF Z HIFI L251 5CPX680J2T C...

Page 27: ...necessary to isolate the oscilloscope when check the secondary circuit A CHECKING THE PRIMARY CIRCUIT No output Voltage NO NO NO YES Prepare the oscilloscope connected the isolated transformer Check L...

Page 28: ...B CHECKING THE SECONDARY CIRCUIT TROUBLESHOOTING GUIDES Appendix Check each output voltage Check trans former Check any diode which causes no power Check any COIL or capacitor which causes no power EN...

Page 29: ...C 601 Is 5V applied to collector of Q711 Q712 Q713 and Q714 Check IC602 Resetic Check D610 1 Check Video Circuit 2 X602 Option Check Q711 Q712 Q713 and Q714 YES YES YES NO NO A NO NO LED ARRAY does no...

Page 30: ...4 TROUBLESHOOTING GUIDES Is each key pulse applied to pin of IC601 Check key matrix circuit Check IC601 NO YES B LED ARRAY is lit but key does not operate 11 12 Appendix...

Page 31: ...he video output signal pin of IC301 YES YES NO NO YES D Is 5V supplied to pin of IC 601 NO YES Is 5V applied to pin of IC 601 YES Is 5V applied to pin of Ld701 Check D607 YES Check pin of IC601 and LD...

Page 32: ...of Ic601 YES NO NO Check IC601 NO Noise appears although change cassette tape CTL HEAD height is normal and there is not dust YES Check CTL input in circuit R501 R502 R503 C501 CTL AMP VREF IC601 pin...

Page 33: ...aveform supplied to at pin of PT01 YES NO Check VIDEO circuit Check connector Head Amp and Clean heads Is Reel pulse applied to pin and of IC601 YES NO YES NO Check REEL sensor part Is D FG applied to...

Page 34: ...ector P502 and DRUM Motor I YES YES Check power circuit NO Is 12V supplied to P501 pin YES NO Is the voltage of pin P501 3 2V YES Check IC601 and C FG NO Is C PWM pin of IC601 correct YES NO Is the vo...

Page 35: ...ARRAY shows Err 1 4 Is 12V applied to pin of IC604 Check power circuit YES NO K Check motor drive circuit Check IC601 Is 5V applied to pin of IC601 when CST IN YES NO Is 5V applied to pin of P201 whe...

Page 36: ...301 YES NO Check the pin of IC 301 Is 5V suppiled to pin and of IC 601 Check PCB pattern Is signal input into pin of IC 601 YES NO Is signal output from pin of IC 601 YES NO YES Check power circuit R...

Page 37: ...301 YES YES Is composite video signal output from pin of IC301 YES Check OSD circuit NO NO YES NO YES NO NO NO NO NO NO NO YES YES Is 5V supplied at pin of IC301 Is 5V supplied to pin of IC301 Check I...

Page 38: ...B L signal supplied IC301 pin Is SW pulse input into IC301 pin Is REC signal output from IC301 pin SP mode pin SLP mode pin Check video head and connector Check EE mode Is signal input into IC301 pin...

Page 39: ...OUBLESHOOTING GUIDES YES D Is 14 318MHz applied to the pin of IC 601 YES NO Is 5V supplied at IC 601 pin YES NO Check power circuit OSD Character Incorrect Check X602 Change IC 601 53 98 99 38 39 Appe...

Page 40: ...it YES NO A Is 5V supplied to pin of IC 251 Check INPUT JACK Is signal input pin of IC251 in line mode YES NO Is 0V supplied to pin of IC251 YES NO YES NO Check SYSCON circuit Change IC251 Is there ou...

Page 41: ...f IC251 pin More than 300mVp p Is A SW PULSE input into pin of IC 251 Is pin of IC 251 over 3V Check IC 601 NO Check the Hi Fi Drum NO Check IC 601 Change IC 251 YES YES YES No Hi Fi sound in playback...

Page 42: ...NO NO Check IC601 Is there output at pin of IC251 Clean HEAD Is there FM osc wave at pin of P401 NO Check IC251 NO Change Drum YES YES YES YES No Hi Fi sound in the playback mode after Hi Fi recording...

Page 43: ...51 NO Is 9V supplied pin Of IC 251 NO Check Power circuit Is there Audio signal pin of IC301 Is pin of IC301 0V NO Check A C head Check P201 and A C head NO NO Check Power circuit YES YES YES YES Chec...

Page 44: ...the voltage above 5 8V at collector of Q202 Is the Emitter of Q205 6V YES NO Check power circuit NO YES Check A C HEAD and connector pin of P201 Check INPUT JACK NO Check power circuit YES YES YES Ch...

Page 45: ...Of IC 301 Check power circuit YES NO A Check INPUT JACK Is signal input pin of IC 301 in line mode YES NO Is 0V supplied to pin of IC 301 YES NO YES Check SYSCON circuit Change IC 301 Is there output...

Page 46: ...R252 C212 of Output Jack Is 5V applied to pin of IC301 Is 0V applied to the pin of IC301 Is the collector of Q203 0V Check Pin of P201 NO NO Check power circuit NO Check IC601 NO Check Q203 Q204 Q205...

Page 47: ...ck Q203 YES Is there output at pin of IC301 Does Q202 oscillate YES YES Check A C HEAD and connector the Pin of P201 and the pin of P202 Check Q203 Emitter 25V Base 32V NO Check Q202 Check INPUT JACK...

Page 48: ......

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