Daewoo DV-K892NZ-QB/M Service Manual
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Daewoo DV-K892NZ-QB/M Service Manual

Daewoo DV-K892NZ-QB/M Service Manual

All models (k30 -mecha) system : ntsc
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S/M No. : VK592NTEF0
Service Manual
Video Cassette Recorder
All models (K30 -Mecha)
SYSTEM : NTSC
Model : DV-K892NZ-QB/M
DV-K592NZ-QB/M
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr

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Summary of Contents for Daewoo DV-K892NZ-QB/M

  • Page 1 S/M No. : VK592NTEF0 Service Manual Video Cassette Recorder All models (K30 -Mecha) SYSTEM : NTSC Model : DV-K892NZ-QB/M DV-K592NZ-QB/M DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SPECIFICATION ....................... 2 GENERAL ADJUSTMENTS....................3 TROUBLESHOOTING GUIDES ..................4 POWER CIRCUIT ..........................4 SERVO / SYSCON / LOGIC CIRCUIT..................... 5 VIDEO CIRCUIT ..........................12 AUDIO CIRCUIT (Hi-Fi MODEL) ......................16 AUDIO CIRCUIT (4 HEAD MODEL) ....................... 21 WAVEFORMS ......................

  • Page 3: Specification

    SPECIFICATION 90~260 Volts AC 60Hz Power Input DV-K592NZ-QB/M (4 Head) DV-K892NZ-QB/M (4 Head, Hi-Fi) 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...

  • Page 4: General Adjustments

    GENERAL ADJUSTMENTS PG (Pulse Generator) Shifter Adjustment Test Points: PT01 PIN 3 Main Video Out Jack Rear Panel Adjust: R595 (PG Shifter) Main The Pulse Generator (PG) Shifter determines the video head switching point during playback. Misadjustment of the PG Shifter may cause head switching noise in the picture and/or vertical jitter. 1.

  • Page 5: Troubleshooting Guides

    TROUBLESHOOTING GUIDES 1. POWER CIRCUIT Caution : When checking the primary circuit, be sure to use an isolation transformer. NO OUTPUT Voltage Is the AC power cord check OK? Change AC CORD Is voltage applied to the terminal Check F801/L801/D801/C806. of C806? Is output voltage of Check Ic601.

  • Page 6: Servo / Syscon / Logic Circuit

    TROUBLESHOOTING GUIDES 2. SERVO / SYSCON / LOGIC CIRCUIT LED ARRAY does not operate. Is 5V supplied to Check D813. of IC601? Is 5V applied to Check IC602. of IC601? Check X601. Check IC601. Is 5V applied to pin Check R636, C616. of IC601 ? Is 4V applied to collector Check Q711, Q712,...
  • Page 7 TROUBLESHOOTING GUIDES 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 1 hour back up timer does not operate. When disconnecting the power cord,Is 5.0V Check C820.
  • Page 8 TROUBLESHOOTING GUIDES 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 9 TROUBLESHOOTING GUIDES Playback picture is not good. Noise appears although adjusting Adjust tracking. tracking. Noise shakes up Noise appears Check and and down on the although change re-adjust the screen. cassette tape. Path of Deck. Adjust the HEAD Is CTL pulse applied CTL HEAD height is height and remove normal and there is...
  • Page 10 TROUBLESHOOTING GUIDES Playback picture is not good. Noise appears over the entire Check TS Flowchart F screen Are SW pulse and Is SW pulse supplied Check D.PG input from pin , of Ic601? HA SW applied to (IC601 pin 16 18 VIDEO circuit? and connector (P502) Check PCB pattern...
  • Page 11 TROUBLESHOOTING GUIDES 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 12 TROUBLESHOOTING GUIDES LED ARRAY shows "Err". Is CAM SW DATA Check Loading Motor. (IC601 pin , , , ) 82 84 86 66 Correct? Check IC601 Cassette loading inoperative. Is 12V applied to pin Check power circuit. IC604 ? Is 5V applied to pin Check IC601.

  • Page 13: Video Circuit

    TROUBLESHOOTING GUIDES 3. VIDEO CIRCUIT EE MODE Picture NG Is video signal input into pin Check PIF circuit and , , of Ic301? LINE IN JACK 34 36 38 Is 5V supplied at pin , 16 58 Check power circuit. of Ic301? Is signal output from pin Check IIC CLK, DATA...
  • Page 14 TROUBLESHOOTING GUIDES 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 ? Check Power circuit...
  • Page 15 TROUBLESHOOTING GUIDES Record video signal NG Check EE mode Is Iuminance and color Is signal input into signal output from IC301 pin , , ? 34 36 38 IC301 pin , ? 12 71 Is +5V supplied at Check power circuit IC401 pin Is REC(H) signal Check REC(H)
  • Page 16 TROUBLESHOOTING GUIDES OSD Character Incorrect. Is 5V supplied at IC601 pin Check power circuit. 98 99 Does X602 crystal (14.318MHz) Check X602 oscillate? Change IC601...

  • Page 17: Audio Circuit (Hi-Fi Model)

    TROUBLESHOOTING GUIDES 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 , 14 20 30 36 of IC251 and pin of IC301? Is signal input pin , 53 61 Check INPUT JACK of IC251 in line mode?
  • Page 18 TROUBLESHOOTING GUIDES No Hi-Fi sound in playback mode of Hi-Fi recorded tape. Is the ENVE level of IC251 pin , 18 19 Check the PRE-AMP circuit more than 200mVp-p? Is A.SW PULSE input into Check IC601 of IC251? Is pin of IC251 over 3V ? Change IC251 Check IC601...
  • Page 19 TROUBLESHOOTING GUIDES 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 IC101 Is the Base of Q205 5V? Check IC601 Is there output at pin of IC251? Check IC251 Is there FM osc wave at pin...
  • Page 20 TROUBLESHOOTING GUIDES No sound in the linear playback mode Is the output at pin Is 9V supplied pin Check Power circuit , of IC251? of IC251? Is 5V supplied to Check Power circuit pin , , , of IC251 30 36 and pin of IC301? Is there Audio signal...
  • Page 21 TROUBLESHOOTING GUIDES 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 22: Audio Circuit (4 Head Model)

    TROUBLESHOOTING GUIDES 5. AUDIO CIRCUIT (4 HEAD MODEL) No sound in the E-E mode Is -5V applied to pin 41 34 Check power circuit. of IC301? Is signal input pin Check INPUT JACK of IC301 in line mode? Is 0V supplied to pin Check SYSCON circuit of IC301? Is there output at pin...
  • Page 23 TROUBLESHOOTING GUIDES No sound in the playback mode. Is the output at pin Is 5V applied to pin Check power circuit of IC301? of IC301? Is IIC CLK applied to Check R214, R265, C279. of IC301? Check IC601 Is IIC DATA applied to of IC301? Is the collector of Q203 0V? Check Q203, Q204, Q205...
  • Page 24 TROUBLESHOOTING GUIDES 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? Is pin of IC301 0V? Check IC601 Is there output at Check IC301 of IC301? Is the voltage above 5.8V Check power circuit...

  • Page 25: Waveforms

    WAVEFORMS 1. LUMA / CHROMA WAVEFORMS (IC301-71) 400mVp-p (IC301-74) 380mVp-p (IC301-12) 300mV (IC301-17) 250mVp-p 200mV/10u sec/cm 200mV/5u s/cm 100mV/10u sec/cm 100mV/5ms/cm PLAY PLAY (IC301-21) 500mVp-p (IC301-21) 500mVp-p (IC301-20) 500mVp-p (IC301-20) 500mVp-p 200mV/10u sec/cm 200mV/10u sec/cm 200mV/10u sec/cm 200mV/10u sec/cm PLAY PLAY (IC301-41) 150mVp-p (IC301-41) 150mVp-p...
  • Page 26 WAVEFORMS 2. LUMA/CHROMA WAVEFORMS (IC301-10) 2Vp-p (IC301-63) 400mVp-p (IC301-61) 300mVp-p (IC301-59) 300mVp-p 1V/10msec/cm 200mV/0.5u sec/cm 200mV/10u sec/cm 200mV/10u sec/cm Search REC/PLAY REC/PLAY REC/PLAY (IC301-57) 300mVp-p 200mV/10u 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...
  • Page 27 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 28 WAVEFORMS 5. Hi-Fi AUDIO WAVEFORMS (IC251-61) 0.8Vp-p (IC251-12) 0.75Vp-p (IC251-26) 0.3Vp-p (IC251-19) 600mVp-p 0.2V/0.5msec 0.2V/0.5msec 0.1V/1msec 200mV/2msec EE/REC/PLAY EE/REC PLAY (IC251-39) 0.75Vp-p (IC251-57) 0.9Vp-p 0.2V/0.5msec 0.2V/0.5msec EE/REC EE/REC...

  • Page 29: Circuit Diagram

    CIRCUIT DIAGRAM 1. INTERCONNECT WIRING DIAGRAM...

  • Page 30: Power Supply Schematic Diagram

    CIRCUIT DIAGRAM 2. POWER SUPPLY SCHEMATIC DIAGRAM...

  • Page 31: Syscon Circuit Diagram

    CIRCUIT DIAGRAM 3. SYSCON CIRCUIT DIAGRAM...

  • Page 32: Video/Audio Schematic Diagram (4 Head)

    CIRCUIT DIAGRAM 4. VIDEO / AUDIO SCHEMATIC DIAGRAM ( 4 HEAD )

  • Page 33: Video/Audio Schematic Diagram (Hi-Fi)

    CIRCUIT DIAGRAM 5. VIDEO / AUDIO SCHEMATIC DIAGRAM ( HI - FI )

  • Page 34: Pif Schematic Diagram (4 Head)

    CIRCUIT DIAGRAM 6. PIF SCHEMATIC DIAGRAM ( 4 HEAD )

  • Page 35: Hi-Fi Schematic Diagram

    CIRCUIT DIAGRAM 7. HI - FI SCHEMATIC DIAGRAM...

  • Page 36: Pif&Mpx Schematic Diagram (Hi-Fi)

    CIRCUIT DIAGRAM 8. PIF & MPX SCHEMATIC DIAGRAM ( HI - FI )

  • Page 37: Pcb Circuit Board

    PCB CIRCUIT BOARD MAIN PCB...

  • Page 38: 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 three(3) screws Holding the top cover. 2) Carefully lift the back of top cover and slide it to the rear to remove it.
  • Page 39 INSTRUMENT DISASSEMBLY 2. Front Panel Removal (Fig. 2) 1) Continued from (Fig. 1). 2) Remove two(2) screws securing front panel & F/L bracket. 3) Remove the F/L bracket. 4) Release seven(7) tabs holding the front panel. (Release bottom tabs first) 5) Remove the front panel.
  • Page 40 INSTRUMENT DISASSEMBLY 3. Bottom Cover Removal (Fig. 3) 1) Remove the top cover and the front panel. 2) Remove two(2) screws. 3) Lift out the bottom cover in the direction of the arrow.
  • Page 41 INSTRUMENT DISASSEMBLY 4. F/L Door Removal (Fig. 4) 1) Open the F/L door 90 degrees. 2) Remove the F/L door in the direction of the arrow.
  • Page 42 INSTRUMENT DISASSEMBLY 5. Deck Assembly Removal (Fig. 5) 1) Remove the top cover, the front panel and the bottom cover. 2) Disconnect the FPC (A). 3) Disconnect three(3) connectors (B) (C) (D). 4) Remove four(4) screws (E) (F). 5) Pull out the Deck Assembly in the direction of the arrow.
  • Page 43 INSTRUMENT DISASSEMBLY 6. Main PCB Assembly Removal (Fig. 6) 1) Remove the top cover, the front panel, the bottom cover and the deck assembly. 2) Release two(2) tabs (A) and lift out the Main PCB in the direction of the arrow.

  • Page 44: Electrical Parts List

    ELECTRICAL PARTS LIST PART LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK BA01 97P0475800 CASE SHI PREAMP SECC T0.4 C204 HCBK102KCA C CHIP CERA 50V X7R 1000PF K 2012 BA02 97P0475900 COVER SHI PREAMP SECC T0.4 C205 HCFK104ZCA C CHIP CERA 50V Y5V 0.1MF Z 2012 MONO BA03...
  • Page 45 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK C278 CEXF1H100A C ELECTRO 50V RSM 10MF (5X7) TP Hi-Fi C335 HCFK223ZCA C CHIP CERA 50V Y5V 0.022MF Z 2012 C279 CMXM2A392J C MYLAR 100V 3900PF J (TP) Hi-Fi C336 CEXF1C101A C ELECTRO 16V RSM 100MF (6.3X7) TP...
  • Page 46 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK C607 HCQK270JCA C CHIP CERA 50V CH 27PF J 2012 C825 CEXF1E470V C ELECTRO 25V RSS 47MF (5X11) TP C610 CBZP1C103M C CERA SEMI 16V Y5S 0.01MF M C826 CEXF1H470V C ELECTRO 50V RSS 47MF (6.3X11) TP C611...
  • Page 47 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK D801 DS1WBA60-C DIODE BRIDGE S1WBA60 4072 CHIP L252 5CPX680J2T COIL PEAKING 68UH(BLU-BLK) Hi-Fi D805 DBZT03C160 DIODE ZENER BZT03C160 RA15/7 L302 5CPZ560K02 COIL PEAKING 56UH K (AXIAL 3.5MM) D806 DZEG01C--- DIODE EG01C L304...
  • Page 48 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK Q705 TZTC3198Y- KTC3198Y-(1815Y) (AUTO) R208 85801060TA WIRE COPPER 0.6X52MM TAPING Hi-Fi Q706 TZTC3198Y- KTC3198Y-(1815Y) (AUTO) RD-AZ681J- R CARBON FILM 1/6 680 OHM J MONO Q707 TZTC3198Y- KTC3198Y-(1815Y) (AUTO) R209 HRFT273JCA R CHIP 1/10 27K OHM J 2012 MONO...
  • Page 49 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK R266 RD-AZ621J- R CARBON FILM 1/6 620 OHM J Hi-Fi R380 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R267 RD-AZ823J- R CARBON FILM 1/6 82K OHM J Hi-Fi R501 HRFT332JCA R CHIP 1/10 3.3K OHM J 2012...
  • Page 50 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK R630 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R804 HRFT689JCA R CHIP 1/10 6.8 OHM J 2012 R631 HRFT472JCA R CHIP 1/10 4.7K OHM J 2012 R805 RS01F334J- R M-OXIDE FILM 1W 330K OHM J R633...
  • Page 51 ELECTRICAL PARTS LIST PART-CORD PART-NAME PART-DISC REMARK PART-CORD PART-NAME PART-DISC REMARK RS30 RD-AZ911J- R CARBON FILM 1/6 910 OHM J SW704 5S50101Z97 SW TACT SKHV10914B 9.5M AUTO RS99 HRFT102JCA R CHIP 1/10 1K OHM J 2012 SW705 5S50101Z97 SW TACT SKHV10914B 9.5M AUTO S601 97P0S01900...

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