Daewoo DV-T8T2NZ-QB/M Service Manual
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Daewoo DV-T8T2NZ-QB/M Service Manual

Daewoo DV-T8T2NZ-QB/M Service Manual

All t-mecha (hi-fi/mono)
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Service Manual
Video Cassette Recorder
ALL T-MECHA (Hi-Fi/MONO)
Model:
DV-T8T2NZ-QB/M
DV-T5T2NZ-QB/M
DV-T5T2
L
R
DV-T8T2
 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. : VT8T2NTEF0
1
2
3
4
5
6
7
8
9
0
VR-F2PB
Sep. 2000

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Summary of Contents for Daewoo DV-T8T2NZ-QB/M

  • Page 1 : 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 Sep. 2000...
  • Page 2 TABLE OF CONTENTS SPECIFICATION ......................2 VOLTAGE CHART ......................3 CIRCUIT DIAGRAM ...................... 6 POWER SUPPLY SCHEMATIC DIAGRAM ....................6 SERVO/SYSCON/CBC CIRCUIT DIAGRAM(T-DECK) ................7 VIDEO/AUDIO 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) .....................

  • Page 3: Specification

    SPECIFICATION 100-240 Volts AC 60Hz(Free voltage) Power Input DV-T5T2NZ-QB/M DV-T8T2NZ-QB/M 17 Watts (4-head Hi-Fi) Power Consumption 17 Watts (4-head) Operating Temperature 5 degree C to 40 degree C (41 degree F to 104 degree F) Storage Temperature -30 degree C to 65 degree C (-22 degree F to 149 degree F) Weight 6.6 Ibs : Net (8.8 Ibs : Gross)

  • Page 4: Voltage Chart

    VOLTAGE CHART MOTOR DRIVE IC (IC604, BA6209/KA3082/DBL2084N) PIN NO. 0.55 0.88 0.01 0.01 0.01 0.01 13.47 13.4 13.48 13.4 0.91 0.91 0.51 A/V CHIP IC (IC301, LA71071M) PIN NO. PIN NO. PIN NO. PIN NO. 2.38 2.57 0.82 2.37 2.37 2.38 2.47 1.86...
  • Page 5 VOLTAGE CHART PIN NO. PIN NO. PIN NO. PIN NO. 1.53 1.66 1.49 2.58 2.53 2.38 2.38 2.17 1.33 2.36 1.78 1.79 0.12 3.88 2.37 H-FI IC (IC201, LA72637M) PIN NO. PIN NO. PIN NO. PIN NO. 2.43 3.49 2.49 2.54 2.43 2.49...
  • Page 6 VOLTAGE CHART TMI (RF101, LGTMI-SLQ1-S) PIN NO. PIN NO. PIN NO. PIN NO. 2.38 4.65 32.8 32.75 1.68 1.41 1.41 4.74 1.58 RESET IC (IC602,BMR-0301G) PIN NO. REGULATOR IC (IC802, KA431AZ) PIN NO. 2.44 2.44...

  • Page 7: Circuit Diagram

    CIRCUIT DIAGRAM 1. POWER SUPPLY SCHEMATIC DIAGRAM...
  • Page 8 CIRCUIT DIAGRAM 2. SERVO/SYSCON/CEC CIRCUIT DIAGRAM(T-DECK)
  • Page 9 CIRCUIT DIAGRAM 3. VIDEO / AUDIO SCHEMATIC DIAGRAM ( 4 HEAD )

  • Page 10: Video/Audio Schematic Diagram (Hi-Fi)

    CIRCUIT DIAGRAM 4. VIDEO / AUDIO SCHEMATIC DIAGRAM ( HI - FI )
  • Page 11 CIRCUIT DIAGRAM 5. PIF SCHEMATIC DIAGRAM ( 4 HEAD )

  • Page 12: Pif&Mpx Schematic Diagram (Hi-Fi)

    CIRCUIT DIAGRAM 6. PIF & MPX SCHEMATIC DIAGRAM ( HI - FI )

  • Page 13: Waveforms

    WAVEFORMS 1. LUMA / CHROMA WAVEFORMS (IC301-26) 500mVp-p (IC301-72) 400mVp-p (IC301-74) 380mVp-p (IC301-21) 500mVp-p 200mV/10u sec/cm 200mV/10u sec/cm 200mV/5u s/cm 200mV/10u sec/cm PLAY PLAY (IC301-25) 500mVp-p (IC301-44) 150mVp-p (IC301-44) 150mVp-p (IC301-25) 500mVp-p 200mV/10u sec/cm 200mV/10u sec/cm 50mV/10u sec/cm 50mV/10u sec/cm PLAY PLAY (IC301-46) 100mVp-p...
  • Page 14 WAVEFORMS 2. LUMA/CHROMA WAVEFORMS (IC301-61) 400mVp-p 200mV/0.5u sec/cm REC/PLAY 3. AUDIO WAVEFORMS (IC301-76) 100mVp-p (IC301-96) 1.5Vp-p (IC301-98) 0.45Vp-p (IC301-7) 2.3Vp-p 20mV/0.5msec/cm 0.5V/0.5msec/cm 0.2V/0.5msec/cm 0.5V/0.5msec/cm (IC301-100) 120mVp-p (T201-5) 65Vp-p (T201-6) 75Vp-p 50mV/0.5msec/cm 10V/20u sec/cm 10V/20u sec/cm PLAY...
  • Page 15 WAVEFORMS 4. SERVO WAVEFORMS (IC601-18) 5Vp-p (IC601-77) 5.5Vp-p (IC601-76) 5Vp-p (IC601-94) 3.8Vp-p 2V/5msec/cm 2V/0.2u sec/cm 2V/0.2u sec/cm 2V/5msec/cm REC/PLAY REC/PLAY REC/PLAY (IC601-97) 4.4Vp-p (IC601-89) 1.3Vp-p (IC601-90) 2Vp-p (IC601-87) 2.5Vp-p 1V/5msec/cm 0.5V/0.5m sec/cm 0.5V/10msec/cm 1V/0.2msec/cm PLAY REC/PLAY REC/PLAY REC/PLAY (IC601-38) 4.8Vp-p 1V/0.05u sec/cm REC/PLAY...
  • Page 16 WAVEFORMS 5. Hi-Fi AUDIO WAVEFORMS (IC251-9,14) 0.8Vp-p (IC251-16) 0.75Vp-p (IC251-21) 0.3Vp-p (IC251-29,30) 600mVp-p 0.2V/0.5msec 0.2V/0.5msec 0.1V/1msec 200mV/2msec EE/REC/PLAY EE/REC PLAY (IC251-35) 0.75Vp-p (IC251-53,57) 0.9Vp-p 0.2V/0.5msec 0.2V/0.5msec EE/REC EE/REC...

  • Page 17: Instrument Disassembly

    INSTRUMENT 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. 1. Top Cover Removal (Fig. 1) 1) Remove two(2) screws Holding the top cover. 2) Carefully lift the back of top cover and slide it to the rear to remove it.
  • Page 18 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 INSTRUMENT DISASSEMBLY 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 direction of the arrow.
  • Page 20 INSTRUMENT DISASSEMBLY 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 direction of the arrow.
  • Page 21 INSTRUMENT DISASSEMBLY 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 22: Electrical Parts List

    ELECTRICAL PARTS LIST 2 is a recommendable part for stock. Caution : In this Service 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) PART LIST PART-CODE PART-NAME...
  • Page 23 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC REMARK PART-CODE PART-NAME PART-DESC REMARK R303 RD-AZ513J- R CARBON FILM 1/6 51K OHM J COMM C309 CEXF1C100A C ELECTRO 16V RSM 10MF 4X7 COMM R304 RD-AZ223J- R CARBON FILM 1/6 22K OHM J COMM C310 CEXF1H100V C ELECTRO...
  • Page 24 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC REMARK PART-CODE PART-NAME PART-DESC REMARK C620 CCXF1H103Z C CERA 50V F 0.01MF Z (TAPPING) COMM D801 DS1WBA60-C DIODE BRIDGE S1WBA60 4072 CHIP COMM C621 CDXA0H104K C SUPER 5.5V 0.1F TAPING COMM D802 DZUZ18BSB- DIODE ZENER UZ-18BSB (16.90-17.67) COMM C623...
  • Page 25 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC REMARK PART-CODE PART-NAME PART-DESC REMARK R602 RD-AZ103J- R CARBON FILM 1/6 10K OHM J COMM R802 RW02B229J- R WIRE WOUND 2W 2.2 OHM J COMM R603 HRFT104JCA R CHIP 1/10 100K OHM J 2012 COMM R803 RD-4Z224JS...
  • Page 26 ELECTRICAL PARTS LIST PART-CODE PART-NAME PART-DESC REMARK PART-CODE PART-NAME PART-DESC REMARK C260 CCZB1H153K C CERA HIBK 50V 0.015MF K AXL 52 HIFI JP232 CCZF1H104Z C CERA 50V HIKF 0.1MF Z HIFI C261 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012 HIFI L251 5CPX680J2T...
  • Page 27 TROUBLESHOOTING GUIDES Appendix 1. POWER CIRCUIT When changing the parts which are broken first, remove the power plug from the socket and then discharge the voltage across the terminals of C805. (Use an external KΩ resistance) When check the primary circuit , use the oscilloscope isolated properly (Use the isolated transformer) and connect GND to the primary GND, however it is not necessary to isolate the oscilloscope when check the secondary circuit.
  • Page 28 TROUBLESHOOTING GUIDES Appendix B. CHECKING THE SECONDARY CIRCUIT. Check each output voltage Check trans former Check any diode which causes no power Check any COIL, or capacitor which causes no power...
  • Page 29 TROUBLESHOOTING GUIDES Appendix 2. SERVO / SYSCON / LOGIC CIRCUIT LED ARRAY does not operate. Is 5V supplied to Check D610. of IC 601? Is 5V applied to Check IC602 (Resetic) of IC 601? 1) Check Video Circuit Is 14.318MHz applied to 2) X602 the pin of IC 601?
  • Page 30 TROUBLESHOOTING GUIDES Appendix LED ARRAY is lit but key does not operate. Is each key pulse Check key matrix applied to pin 11 12 circuit. of IC601? Check IC601...
  • Page 31 TROUBLESHOOTING GUIDES Appendix When change the channel broadcast signal is not received. Is the output of pin Is the output of pin Is the output of pin Is the output of pin Is the output of pin of IC601 Check IC601 Check the Video normal? output Buffer Q101...
  • Page 32 TROUBLESHOOTING GUIDES Appendix Playback picture is not good. Noise appears Although adjusting Adjust tracking. Tracking. Noise shakes up Check and Noise appears and down on the Re-adjust the although change screen. Path of Deck. cassette tape. Adjust the HEAD CTL HEAD height is Is CTL pulse applied height and remove normal and there is...
  • Page 33 TROUBLESHOOTING GUIDES Appendix Playback picture is not good. Noise appears over the entire Check TS Flowchart F screen Is SW pulse supplied Are SW pulse and Check D.PG input HA SW applied to from pin , of Ic601? (IC601 pin 16 18 VIDEO circuit? and connector (P502)
  • Page 34 TROUBLESHOOTING GUIDES Appendix Drum Motor does not rotate. Is 12V supplied to P502 Check power circuit. Is D.PWM (pin ) Check IC601 and D.FG. of IC601 correct? Is the voltage of P502 pin Check R508, R509 and C514 1.2V? Check connector (P502) and DRUM Motor Capstan Motor does not rotate.
  • Page 35 TROUBLESHOOTING GUIDES Appendix LED ARRAY shows "Err". Is CAM SW DATA Check Loading Motor and (IC601 pin , R624~R629, C629~C632. Correct? Check IC601 Cassette loading inoperative. Is 12V applied to pin Check power circuit. IC604 ? Is 5V applied to pin Check IC601.

  • Page 36: Video Circuit

    TROUBLESHOOTING GUIDES Appendix 3. VIDEO CIRCUIT EE MODE Picture NG Is video signal input into pin Check PIF circuit and , , of IC 301? 38 40 LINE IN JACK Is 5V supplied at pin , , 21 54 Check power circuit. of IC 301? Is signal output from pin Check the pin , of IC 301...
  • Page 37 TROUBLESHOOTING GUIDES Appendix PB video signal missing. Is envelope output from Is 5V supplied at Check power circuit of IC301 ? of IC301 ? Is SW pulse input into Check pin of IC601 of IC301? Clean head or change head Is signal output from Is 5V supplied to of IC301 ?
  • Page 38 TROUBLESHOOTING GUIDES Appendix Record video signal NG Check EE mode Is color signal output from Is signal input into IC 301 pin IC301 pin , , ? 38 40 42 Is +5V supplied at Check power circuit IC 301 pin Is PB(L) signal Check PB(L) supplied IC301 pin ?
  • Page 39 TROUBLESHOOTING GUIDES Appendix OSD Character Incorrect. Is 5V supplied at IC 601 pin Check power circuit. 98 99 Is 14.318MHz applied to the pin , of 38 39 Check X602 IC 601? Change IC 601...

  • Page 40: Audio Circuit (Hi-Fi Model)

    TROUBLESHOOTING GUIDES Appendix 4. AUDIO CIRCUIT (Hi-Fi MODEL) No sound in the E-E mode Is 9V supplied to pin of IC251? Check power circuit. Is 5V supplied to pin , 25 40 of IC 251? Is signal input pin , Check INPUT JACK of IC251 in line mode? Is 0V supplied to pin...
  • Page 41 TROUBLESHOOTING GUIDES Appendix No Hi-Fi sound in playback mode of Hi-Fi recorded tape. Is the ENVE level of IC251 pin , 29 30 Check the Hi-Fi Drum More than 300mVp-p? Is A.SW PULSE input into Check IC 601 of IC 251? Is pin of IC 251 over 3V ? Change IC 251...
  • Page 42 TROUBLESHOOTING GUIDES Appendix No Hi-Fi sound in the playback mode after Hi-Fi recording. Check the following procedure in RECORD mode. Is the signal supplied to pin , of IC251? Check the Input Jack Is the Base of Q205 5V? Check IC601 Is there output at pin of IC251? Check IC251...
  • Page 43 TROUBLESHOOTING GUIDES Appendix No sound in the linear playback mode Is the output at pin Is 9V supplied pin Check Power circuit , of IC 251? Of IC 251? Is 5V supplied to Check Power circuit pin , of IC 251? 25 40 Is there Audio signal Check A/C head...
  • Page 44 TROUBLESHOOTING GUIDES Appendix No linear sound in the playback mode after linear recording. Check the following procedure in RECORD mode. Is the signal supplied to pin , Check INPUT JACK of IC251 and pin of IC301? Check IC601 Is the Base of Q205 5V? Is there output at pin Check IC301 of IC301?

  • Page 45: Audio Circuit (2 / 4 Head Model)

    TROUBLESHOOTING GUIDES Appendix 5. AUDIO CIRCUIT (2 / 4 HEAD MODEL) No sound in the E-E mode Is -5V applied to pin Check power circuit. Of IC 301? Is signal input pin Check INPUT JACK of IC 301 in line mode? Is 0V supplied to pin Check SYSCON circuit of IC 301?
  • Page 46 TROUBLESHOOTING GUIDES Appendix No sound in the playback mode. Is the output at pin Is 5V applied to pin Check power circuit of IC301? of IC301? Is 0V applied to the Check IC601 Check the R252, C212 of Output Jack of IC301? Check Q203, Q204, Q205 Is the collector of Q203 0V?
  • Page 47 TROUBLESHOOTING GUIDES Appendix No sound in the playback mode after recording. Check the following procedure in RECORD mode. Is the signal applied to Check INPUT JACK. of IC301? Check IC601 Is pin of IC301 0V? Is there output at Check IC301 of IC301? Is the voltage above 5.8V Check power circuit...

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