Daewoo DVST7C3 Series Service Manual
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Daewoo DVST7C3 Series Service Manual

Daewoo DVST7C3 Series Service Manual

Video cassette recorder all t-mecha pal/secam
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Service Manual
Video Cassette Recorder
ALL T-MECHA (Hi-Fi/MONO)
Model: (PAL/SECAM MODELS)
DVST7C3_(ST-821)

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Summary of Contents for Daewoo DVST7C3 Series

  • Page 1 Service Manual Video Cassette Recorder ALL T-MECHA (Hi-Fi/MONO) Model: (PAL/SECAM MODELS) DVST7C3_(ST-821)

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SAFETY&PRECAUTIONS ....................2 EXTERNAL VIEWS ......................4 FRONT VIEWS FUNCTION ........................4 REAR VIEWS FUNCTION ........................6 ELECTRICAL ADJUSTMENT.................... 7 SPECIFICATIONS ......................8 CIRCUIT INFORMATION ....................9 INTERCONNECT WIRING DIAGRAM..................... 9 POWER CIRCUIT DIAGRAM......................... 10 POWER BLOCK DIAGRAM ........................12 SYSCON CIRCUIT DIAGRAM .......................

  • Page 3: Safety&Precautions

    SAFETY & PRECAUTIONS SAFETY CHECK AFTER SERVING Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires have been returned to original positions. Afterwards, perform the following tests and conform the specified values in order to verify compliance whit safety standards.
  • Page 4 SAFETY & PRECAUTIONS 4. Leakage current test Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally exposed accessi- ble parts (RF terminals, antenna terminals, video and audio input output terminals, microphone jacks, earphone jacks, etc.) Measuring method:(Power ON) Insert load Z between B(earth ground, power cord plug prongs) and exposed accessible parts.

  • Page 5: External Views

    EXTERNAL VIEWS 1. FRONT VIEWS FUNCTION DVST7C3 FRONT VIEW...
  • Page 6 EXTERNAL VIEWS HI-FI 2 SCART TYPE REAR VIEW...

  • Page 7: Electrical Adjustment

    ELECTRICAL ADJUSTMENT 1. PLAYBACK PHASE ADJUSTMENT TEST TEST INPUT ITEM MODE CHECK POINT POINT EQUIPMENT TAPE SIGNAL 6.5H PIN 4 & PIN 5 PLAY [REC] BUTTON OSCILLOSCOPE DP-2 NO SIGNAL ADJUSTMENT OF P502 ADJUSTMENT PARTS MEASURING POINT PCB : MAIN - TOP VIEW P502 OSCILLOSCOPE BLOC...

  • Page 8: Specifications

    SPECIFICATIONS GENERAL Power Requirement AC 230V, 50Hz Power Consumption Max. 17W (in REC mode) Temperature 5×C ~ 35×C (Operating) -20×C ~ 60×C Operating position Horizontal only Dimensions (W x H x D) 360 x 90 x 288 (mm) Weight Approx. 3.85 Kg Format VHS standard Tape Width...

  • Page 9: Circuit Information

    CIRCUIT INFORMATION 1. INTERCONNECT WIRING DIAGRAM...

  • Page 10: Power Circuit Diagram

    CIRCUIT INFORMATION 2. POWER CIRCUIT DIAGRAM...
  • Page 11 CIRCUIT INFORMATION POWER MODE POWER MODE LOC. PLAY REC. LOC. PLAY REC. IC802 2.46 2.46 2.46 Q801 4.81 4.83 4.82 -0.12 -0.11 -0.72 0.01 IC801 5.88 5.89 5.89 Q802 /803 4.81 4.83 4.83 0.25 0.26 0.17 0.25 0.25 0.25 0.12 0.11 0.17 Q821...

  • Page 12: Power Block Diagram

    CIRCUIT INFORMATION 3. POWER BLOCK DIAGRAM...

  • Page 13: Syscon Circuit Diagram

    CIRCUIT INFORMATION 4. SYSCON CIRCUIT DIAGRAM...
  • Page 14 CIRCUIT INFORMATION SYSCON MODE SYSCON MODE LOC. PLAY REC. LOC. PLAY REC. IC501 0.01 0.03 2.63 2.61 2.61 4.64 4.97 4.96 5.18 5.18 5.18 0.01 5.18 0.04 0.01 0.12 4.74 5.04 2.28 1.13 0.01 0.01 4.73 0.01 0.12 1.85 0.14 5.17 5.17 5.15...

  • Page 15: Servo & Syscon Block Diagram

    CIRCUIT INFORMATION 5. SERVO & SYSCON BLOCK DIAGRAM...

  • Page 16: Av & Secam Color Circuit Diagram

    CIRCUIT INFORMATION 6. AV & SECAM COLOR CIRCUIT DIAGRAM...
  • Page 17 CIRCUIT INFORMATION MODE MODE MODE LOC. PLAY REC. LOC. PLAY REC. LOC. PLAY REC. IC301 5.09 0.78 1.19 1.02 1.21 Q201 0.02 0.02 0.02 0.03 0.03 0.84 0.02 0.02 0.02 0.03 0.03 0.84 2.29 2.28 2.55 0.85 1.92 0.86 5.11 0.77 0.33 0.17...

  • Page 18: Video Playback/Record Path For Pal

    CIRCUIT INFORMATION 7-1. VIDEO PLAYBACK PATH FOR PAL 7-2. VIDEO RECORD PATH FOR PAL...

  • Page 19: Hifi & Sw Circuit Diagram

    CIRCUIT INFORMATION 8. HIFI & SW CIRCUIT DIAGRAM...
  • Page 20 CIRCUIT INFORMATION HIFFI BLOCK DIAGRAM HIFI&SW MODE HIFI&SW MODE LOC. PLAY REC. LOC. PLAY REC. IC251 0.00 0.00 0.00 IC601 5.13 5.14 5.13 3.90 3.90 3.90 5.16 5.16 5.15 3.90 3.90 3.90 5.16 5.16 5.13 0.00 0.00 0.00 5.15 5.15 5.14 0.00 0.00...

  • Page 21: Pif Circuit Diagram

    CIRCUIT INFORMATION 9. PIF CIRCUIT DIAGRAM...
  • Page 22 CIRCUIT INFORMATION MODE MODE MODE LOC. PLAY REC. LOC. PLAY REC. LOC. PLAY REC. IC051 5.02 0.00 5.02 IC151 0.02 0.01 0.02 Q001 0.002 0.002 0.002 1.52 0.07 1.52 2.66 2.68 2.64 0.01 0.01 0.012 1.52 0.00 1.52 2.66 2.70 2.66 5.86 5.86...

  • Page 23: Components Location Guide On Pcb Bottom View

    COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW PCB MAIN...

  • Page 24: Disassembly

    DISASSEMBLY 1. PACKING ASS’ Y...
  • Page 25 DVST7C3 SERIES...

  • Page 26: Instrument Disassembly

    DISASSEMBLY 3. INSTRUMENT DISASSEMBLY 3-1. SET TOTAL...

  • Page 27: Electrical Parts List

    ELECTRICAL PARTS LIST “ ” is a recommendable part for essential stock. 1. PCB MAIN AS LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK PVACPSS119 ACCESSORY AS DVST7L1S-AQ B1910 97SA481050 PINCH ROLLER AS D15(DAEJIN D2.6*D7*T4.5) DP01 97P95600S0 MANUAL OWNERS SECAM-L MODEL A2200 97SA318050...
  • Page 28 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK M401 97P0478200 CASE SHI PREAMP ET T0.4 C271 HCBK682KBA C CHIP CERA 50V X7R 6800PF K 1608 M801 97P0974300 PLATE EARTH-P ET T=0.4 C277 HCBK682KBA C CHIP CERA 50V X7R 6800PF K 1608 P201 97P62Y1318...
  • Page 29 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK C627 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 R271 HRFS470JBA R CHIP 1/16 47 OHM J 1608 C628 HCFH223ZBA C CHIP CERA 25V Y5V 0.022MF Z 1608 R302 HRFS822JBA R CHIP 1/16 8.2K OHM J 1608...
  • Page 30 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK RJ503 HRF8000-EA R CHIP 1/8 0 OHM 3216 C279 CEXF1C470A C ELECTRO 16V RSM 47MF (5X7) TP RJ504 HRF8000-EA R CHIP 1/8 0 OHM 3216 C283 CEXF1C470A C ELECTRO 16V RSM 47MF (5X7) TP RJ541 HRFS000-BA...
  • Page 31 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK C826 CEXF1H100A C ELECTRO 50V RSM 10MF (5X7) TP SW502 5S50101Z97 SW TACT THVV952GBA 9.5M AUTO C828 CEXF1C470A C ELECTRO 16V RSM 47MF (5X7) TP SW503 5S50101Z97 SW TACT THVV952GBA 9.5M AUTO C829...
  • Page 32 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK D506 DZN4148--- DIODE 1N4148 AUTO 52MM JP085 85801060TA WIRE COPPER 0.6X52MM TAPING D509 DZN4148--- DIODE 1N4148 AUTO 52MM JP088 85801060TA WIRE COPPER 0.6X52MM TAPING D510 DZN4148--- DIODE 1N4148 AUTO 52MM JP102 85801060TA...
  • Page 33 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK R153 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R329 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R154 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R330 RD-AZ223J- R CARBON FILM...
  • Page 34 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK R618 RD-AZ470J- R CARBON FILM 1/6 47 OHM J JP043 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP044 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R619 RD-AZ470J- R CARBON FILM 1/6 47 OHM J JP052...
  • Page 35 ELECTRICAL PARTS LIST LOC. PART-CODE PART-NAME PART-DESC. REMARK LOC. PART-CODE PART-NAME PART-DESC. REMARK JP133 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP192 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP135 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP193 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING JP138 85801065GY...

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