Durabrand DBV4403 Service Manual
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Durabrand DBV4403 Service Manual

Video cassette recorder
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DBV4403
SERVICE MANUAL
VIDEO CASSETTE RECORDER
SUPPLEMENT
MFR'S VERSION D
This SUPPLEMENT must be used together SERVICE MANUAL for MVR4052.
All other test and repair procedures are as shown in the ORIGINAL MANUAL.
Please file this SUPPLEMENT with the ORIGINAL VERSIONS.
Design and specifications are subject to change without notice.

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  • Page 1 DBV4403 SERVICE MANUAL VIDEO CASSETTE RECORDER SUPPLEMENT MFR’S VERSION D This SUPPLEMENT must be used together SERVICE MANUAL for MVR4052. All other test and repair procedures are as shown in the ORIGINAL MANUAL. Please file this SUPPLEMENT with the ORIGINAL VERSIONS.
  • Page 2 ELECTRICAL REPLACEMENT PARTS LIST MVR4052 DBV4403 REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION CD6002 06CPL02006 CABLE CPL02006 06CQL02006 CABLE SI-C108-40 MECHANICAL REPLACEMENT PARTS LIST MVR4052 DBV4403 REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION A4F210B720 CABINET,FRONT ASS'Y A4F240D720 CABINET,FRONT ASS'Y...

  • Page 3: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 3. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER As for the places which need special attentions, ASSEMBLING OR WIRING they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the There are parts which use the insulation indications and notices in the operation manual.

  • Page 4: Table Of Contents

    CONTENTS A1-1 SERVICING NOTICES ON CHECKING ..................HOW TO ORDER PARTS ......................A1-1 CONTENTS ..........................A2-1 GENERAL SPECIFICATIONS ....................... A3-1~A3-4 DISASSEMBLY INSTRUCTIONS B1-1 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........2. REMOVAL OF DECK PARTS ....................B2-1~B2-6 3.

  • Page 5: General Specifications

    GENERAL SPECIFICATIONS G - 1 V C R System VHS Player / Recorder System Video System NTSC Hi-Fi STEREO NTSC PB(PAL60Hz) Deck DECK OVD-7 Loading System Front Motor Heads Video Head 4Head FM Audio Head 2Head Normal Audio /Control Mono / Yes Erase(Full Track Erase) Tape Speed...
  • Page 6 GENERAL SPECIFICATIONS Indicator Power Stand by Rec/OTR Repeat TV/VCR T-Rec Tape In Terminals Front Video Input RCA x 1 Audio Input RCA x 2 (Stereo) Other Terminal Rear Video Input Audio Input Video Output RCA x 1 Audio Output RCA x 2 (Stereo) Euro Scart DC Jack 12V(Center +) VHF/UHF Antenna Input...
  • Page 7 GENERAL SPECIFICATIONS F1,F2 RF Output CH G - 1 4 Clock,Timer Calendar 1990/1/1 ~ 2081/12/31 and Timer Timer Events 8 prog/1 month Back-up One Touch Recording Max Time 5 Hours OTPB Valid Time Timer Back-up (at Power Off Mode) 5 sec. G - 1 5 Remote Unit...
  • Page 8 GENERAL SPECIFICATIONS Remort Control Code 1/2 SQPB CATV Energy Star MTS(SAP) CM Skip(30sec x 6 Times) G - 1 7 Accessories Owner's Manual Language English/French w/Guarantee Card Remote Control Unit Dew Cation Sheet Video Cassette Tape Battery UM size x pcs Safety Tip Toll Free Insert Sheet Quick Set-Up Sheet...

  • Page 9: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1-3: DECK CHASSIS (Refer to Fig. 1-3) 1. REMOVAL OF MECHANICAL PARTS Remove the 3 screws 1. AND P.C. BOARDS Disconnect the following connectors: (CP1001,CP4001, 1-1: TOP CABINET, FRONT CABINET AND CP4002 and CP4003). OPERATION PCB (Refer to Fig. 1-1) Remove the Deck Chassis in the direction of arrow.

  • Page 10: Removal Of Deck Parts

    DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DECK PARTS NOTE In case of the Locker R installation, check if the two 2-1: TOP BRACKET (Refer to Fig. 2-1) positions of Fig.2-3-B are correctly locked. Extend the 2 supports 1. When you install the Cassette Side R, be sure to move Slide the 2 supports 2 and remove the Top Bracket.
  • Page 11 DISASSEMBLY INSTRUCTIONS 2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A) Remove the screw 1. Remove the Loading Motor. Tension Connect Tension Band Remove the Worm. Tension Spring Tension Arm Ass'y Loading Motor Tension Holder Worm Main Chassis Fig. 2-7-B • Screw Torque: 3 ± 0.5kgf•cm Fig.
  • Page 12 DISASSEMBLY INSTRUCTIONS 2-8: T BRAKE ARM/T BRAKE BAND (Refer to Fig. 2-8-A) Remove the T Brake Spring. Idler Gear Turn the T Brake Arm clockwise and bend the hook Idler Arm Ass'y section to remove it. Unlock the 2 supports 1 and remove the T Brake S Reel Band.
  • Page 13 DISASSEMBLY INSTRUCTIONS 2-10: CASSETTE OPENER/PINCH ROLLER BLOCK/ P5 ARM ASS'Y (Refer to Fig. 2-10-A) Unlock the support 1 and remove the Cassette Opener. Remove the Pinch Roller Block and P5 Arm Ass'y. A/C Head Cassette Opener A/C Head Spring Pinch Roller Block A/C Head Base P5 Arm Ass'y •...
  • Page 14 DISASSEMBLY INSTRUCTIONS 2-13: AHC ASS'Y/CYLINDER UNIT ASS'Y 2-15: MAIN CAM/PINCH ROLLER CAM/JOINT GEAR (Refer to Fig. 2-13) (Refer to Fig. 2-15-A) Unlock the support 1 and remove the AHC Ass'y. Remove the E-Ring 1, then remove the Main Cam. Remove the E-Ring 2, then remove the Pinch Roller Disconnect the following connector: Cam and Joint Gear.
  • Page 15 DISASSEMBLY INSTRUCTIONS NOTE 2-18: CASSETTE GUIDE POST/INCLINED BASE S/T UNIT/P4 CAP (Refer to Fig. 2-18-A) 1. When you install the Loading Arm S Ass'y, Loading Arm T Ass'y and Main Loading Gear, align each marker. Remove the P4 Cap. Unlock the support 1 and remove the Cassette Guide (Refer to Fig.

  • Page 16: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 3-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 17 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 3-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 18: Key To Abbreviations

    KEY TO ABBREVIATIONS Audio/Control H.SW Head Switch Automatic Color Control Hertz Audio Erase Integrated Circuit Automatic Frequency Control Intermediate Frequency Automatic Fine Tuning Indicator AFT DET Automatic Fine Tuning Detect Inverter Automatic Gain Control Killer Amplifier Left Antenna Light Emitting Diode A.PB Audio Playback LIMIT AMP...
  • Page 19 KEY TO ABBREVIATIONS SYNC Synchronization SYNC SEP Sync Separator, Separation Transistor TRAC Tracking TRICK PB Trick Playback Test Point UNREG Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse, Voltage Display V.PB Video Playback Variable Resistor V.REC Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source...

  • Page 20: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. Method Operations Press the ATR button on the Adjusting of the Tracking to the center position. remote control for more than Refer to the "MECHANICAL ADJUSTMENT"...

  • Page 21: Preventive Checks And Service Intervals

    PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. Time 1,000 1,500...

  • Page 22: Servicing Fixtures And Tools

    SERVICING FIXTURES AND TOOLS (For 2 heads model) (For 4 heads model) JG002B Adapter JG005 Post Adjustment VHS Alignment Tape VHS Alignment Tape JG002E Dial Torque Gauge Screwdriver JG001 (VN S-LI6 ) JG001B (VN S-LI6 ) (10~90gf•cm) Part No. SV-TG0-030-000 JG001A (VN S-CO1 ) JG001I...

  • Page 23: Mechanical Adjustments

    MECHANICAL ADJUSTMENTS 1. CONFIRMATION AND ADJUSTMENT 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION Read the following NOTES before starting work. Set to the PLAY mode. • Place an object which weighs between 450g~500g on Adjust the adjusting parts for the Tension Arm position the Cassette Tape to keep it steady when you want to so that the Tension Arm top is within the standard line of make the tape run without the Cassette Holder.
  • Page 24 MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE NOTE Install the Torque Gauge (JG002F) and Adapter (JG002B) If the torque is out of the range, replace the following on the S Reel. Set to the Picture Search (Rewind) mode. parts. (Refer to Fig.1-4-B) Check item Replacement Part Then, confirm that it indicates 120~180gf•cm.
  • Page 25 MECHANICAL ADJUSTMENTS 2-2: CONFIRMATION AND ADJUSTMENT OF AUDIO/ 2-3: TAPE RUNNING ADJUSTMENT CONTROL HEAD (X VALUE ADJUSTMENT) When the Tape Running Mechanism does not work well, Confirm and adjust the height of the Reel Disk. adjust the following items. (Refer to item 1-1) Confirm and adjust the position of the Tension Post.
  • Page 26 MECHANICAL ADJUSTMENTS 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 1. Tension Connect P4 Post 2. Tension Arm T Brake Spring 3. Guide Roller T Reel 4. Audio/Control Head S Reel 5. X value adjustment driver hole Adjusting parts for the Tension Arm position D1-4...

  • Page 27: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS Read and perform this adjustment when repairing the circuits or replacing electrical parts or PCB assemblies. 1. BASIC ADJUSTMENT CAUTION When replacing IC's or transistors, use only specified silicon grease (YG6260M). (To prevent the damage to IC's and transistors.) 1-1: PG SHIFTER CONDITIONS MODE-PLAYBACK...
  • Page 28 ELECTRICAL ADJUSTMENTS 2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE TP1001 J4205 J4204 J4203 T501 VR1001 TU6001 TP4001 TP1002 TP4201 J4201 SYSCON PCB D2-2...

  • Page 29: Y/C/Audio/Ccd/Head Amp

    Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM X4001 100CT3R508 Q4012 Q4010 BUFFER Y/C/AUDIO/CCD/HEAD AMP IC BUFFER IC4001 LA71201M-N-MPB VX01 PULL Y/C_CS SERIAL SYSCON/SERVO TIMMING DRIVER CLAMP IIC_DATA DECODER H.SW IIC_CLK DETAL FM-EQ EMPHA CLAMP CONV CP4001 C-LPF EP/LP-CH2 (L) Y-LPF EP/LP_COM EP/LP-CH1 (R) H.AMP YNR/ B-UP...
  • Page 30 SYSTEM CONTROL/SERVO BLOCK DIAGRAM SYSCON/TIMER/SERVO IC IC1001 OEC0104B CENT LED P.OFF-L 4FSC Q1007 MS SEN-A MODE_VCC FS/IIC CLK 18 IIC_CLK CENT SW MS SEN-B IIC DATA IIC_DATA MS_SEN B MS_SEN A Y/C_CS Y/C_CS Q1004 Q1005 DUMMY V.SYNC DUMMY_V.SYNC V.REC ST-H V.REC_ST-H AT+5.2V C.ROTARY...
  • Page 31 TUNER BLOCK DIAGRAM FRONT AV JACK VIDEO AUDIO L AUDIO R REAR OUT JACK J4205 J4203 J4204 J4201 Q4201 VIDEO_OUT SYSCON/SERVO BUFFER TUNER_V Y/C/AUDIO/CCD P. CON + 12V FRONT_V_IN HEAD AMP RF-SW SW6001 FRONT_A_IN-R FRONT_A_IN-L AUDIO_OUT_R HI-FI/DEMODULATOR AUDIO_OUT_L Q4203 TU6001 MUTE SW RF_CONV_A.
  • Page 32 HI-FI/DEMODULATOR BLOCK DIAGRAM HI-FI AUDIO/HEAD AMP/DEM IC IC5501 AN3663FBP FRONT_A_IN-R INPUT SW FRONT_A_IN-L AUDIO_OUT_R Y/C/AUDIO/CCD TUNER OUTPUT HF_COM /HEAD AMP AUDIO_OUT_L RF_CONV_A. OUT FROM_NORMAL_A TUNER_A TO_NORMAL_A FM LIM V. REC_ST-H BLOCK HIFI_ENV. DET HIFI_H. SW SYSCON/SERVO AUDIO_MUTE-H IIC_CLK LOGIC IIC_DATA ST_SELECT...
  • Page 33 OPERATION BLOCK DIAGRAM CH UP CP651 CP601 CH DOWN KEY-A KEY-A KEY-B KEY-B STOP/EJECT REM_IN OS651 REC/OTR TV/VCR LED D664 SYSCON/TSERVO FF/CUE 1G/TV/VCR_LED T_REC LED PLAY D665 2G/T_REC_LED REW/REV REC LED D666 3G/REC_LED POWER POWER BLOCK DIAGRAM T501 +32V Q512 P.

  • Page 34: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) SOLDER SIDE D664 D665 D663 D666 OS651 CP651 C514 J4204 J4205 C520 J4203 R1043 TP1001 R660 W036 W113 Q512 D514 Q515 Q509 D513 X1001_1 C502 SW608_3 D524 D512 R549 SW606_3 R604 W029 Q1004 W112 R520 W033 W123...
  • Page 35 PRINTED CIRCUIT BOARDS SYSCON/OPERATION (CHIP MOUNTED PARTS) SOLDER SIDE Q4203 R6006 C5545 R4202 C5544 C5543 C5541 R5507 C4028 R4206 C5542 Q4204 Q4003 C4015 R4021 R5502 C4032 C4019 C5508 C5504 C5530 R5513 IC4001 C5514 R4039 C4061 C6014 C4060 Q4012 R516 Q4010 C4054 R4036 R4034...

  • Page 36: Y/C/Audio/Ccd/Head Amp

    Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) R4041 BUFFER Q4012 1.8K 2SC2412K FROM POWER P.CON+5V FROM/TO TUNER C4058 FRONT_V_IN 6.3V C4059 TUNER_V 0.1 F R4038 C4061 FROM/TO HI-FI/DEMODUTATOR 680K 0.01 B BUFFER Q4011 TO_NORMAL_A 2SC2412K FROM_NORMAL_A 4FSC HF_COM BUFFER C4016_1 COMP OUT ALWAYS 4Fsc CLOCK...
  • Page 37 SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM FROM/TO POWER POWER_FAIL LED_VCC (SYSCON PCB) POWER_ON-L AT+5V[M-CON] P.CON+5V AT+5.2V AT+12.6_V (S/S) (MOTOR) (LED) FROM/TO HI-FI/DEMODULATOR V.REC_ST-H HIFI_ENV.DET HIFI_H.SW AUDIO_MUTE-H IIC_CLK IIC_DATA ST_SELECT C1001 FROM/TO Y/C/AUDIO/CCD/HEAD AMP 4FSC FROM/TO DECK IIC_CLK CP1001 X1001_1 TMC-J12P-B2 IIC_DATA L1001 1002T01003 L1002 CAP_FG...

  • Page 38: Power

    POWER SCHEMATIC DIAGRAM (SYSCON PCB) TO HI-FI/DEMODULATOR +12V TO TUNER (TUNER) R549 +32V 330 1/4W 11.8 11.7 +12V 12.4 P.CON+12V SW Q512 KTC3203_Y D521 AT+5.2V 1SS244 R525 P.ON SW P.CON+5V Q513 1/4W KRC103RTK L501 12.7 AC120V_60Hz TO Y/C/AUDIO/CCD/HEAD AMP R503 D505 CD501 0R3A433F20...

  • Page 39: Operation

    OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) REW/REV SW607_3 SKQNAED010 PLAY SW606_3 SKQNAED010 FF/CUE SW605_3 SKQNAED010 FROM/TO SYSCON/SERVO REC/OTR SW604_3 1G/TV/VCR_LED 2G/T-REC_LED SKQNAED010 3G/REC_LED REM_IN KEY-B KEY-A R658 1G/TV/VCR_LED STOP/EJECT CP601 CD651 CP651 SW603_3 560 1/4W B2013H02-3P A2001WV2-3P CU230701 R659 2G/T-REC_LED KEY-A KEY-A SKQNAED010 560 1/4W...

  • Page 40: Tuner

    TUNER SCHEMATIC DIAGRAM (SYSCON PCB) RF-SW SW6001 SLD-12-592 REAR OUT JACK J4201_2 TU6001 MSP-213V1-432 PB TCMN0682PA13D R6006 RF_CONV_A.OUT A.IN VIDEO OUT W844 TP4201 TV/VCR CONTROL R6004 V.IN 1K 1/4W RF AGC R4212 AUDIO_OUT-R C4209 R4206 W804 AUDIO_OUT-L IIC_CLK_A R4201 R4207 CLOCK MUTE SW AT+5.2V...
  • Page 41 HI-FI/DEMODULATOR SCHEMATIC DIAGRAM (SYSCON PCB) C5514 0.1 F C5521 R5519 0.22 3.3K 1/4W FROM/TO TUNER FRONT_A_IN-R FRONT_A_IN-L HI-FI/AUDIO/HEAD AMP/DEM IC IC5501 AUDIO_OUT-R R5513 AN3663FBP AUDIO_OUT-L 2.2M RF_CONV_A.OUT C5506 C5540 0.015 B DEM_BLK ZZ-PROM PILOT LOGIC TUNER_A C5517 C5501 C5507 INPUT MUTE VCO-F0 75uS DE-EMPH...

  • Page 42: Interconnection Diagram

    INTERCONNECTION DIAGRAM HALL MAIN ROTOR FULL ERASE HEAD ASS’Y SENSOR COIL MAGNET FG SENSOR H5002 LOADING MOTOR M101 HALL HALL OPERATION PCB SWITCH PCB270 LOGIC VEA958 CP1001 CAP_FG CAP_VCO VCC(5V) AC120V_60Hz CAP.M F/R CD501 I_LIMIT MOTOR_GND WHITE S502 LD/CY_VCO BLACK CAP_CTL S501 LDM_CTL...

  • Page 43: Waveforms

    WAVEFORMS Y/C/AUDIO/CCD/HEAD AMP SYSCON/SERVO 1 POWER ON 6 POWER ON 11 POWER ON 10µs 500mV/div 5ms 1.0V/div 50ns 1.0V/div 2 POWER ON 7 PB 12 FF/REW 100ns 100mV/div 2µs 1.0V/div 5ms 2V/div 3 PB 8 POWER ON 14 POWER OFF 1ms 100mV/div 500µs 1.0V/div 5ms 2V/div...

  • Page 44: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J4201 TU6001 PCB010 (SYSCON PCB) J4203 J4204 J4205 T501 PCB270 (OPERATION PCB)

  • Page 45: Chassis Exploded Views

    CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5002 H5001 M101 NOTE: Applying positions AA and AB for the grease CLASS PART NO. MARK are displayed for this section. GREASE G-555G Check if the correct grease is applied for each position. MG-33...
  • Page 46 CHASSIS EXPLODED VIEW (BOTTOM VIEW) M2001 NOTE: Applying positions AA and AB for the grease CLASS PART NO. MARK are displayed for this section. GREASE G-555G Check if the correct grease is applied for each position. MG-33...

  • Page 47: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST DESCRIPTION REF. NO. PART NO. A4F210B720 CABINET,FRONT ASS'Y 701WPJB416 CABINET,FRONT 702WSB0058 CABINET,TOP 712WPJB163 FLAP 743WKA0032 SPRING,FLAP (COMBO) 735WPAA216 BUTTON,FRAME 800WFA0045 CUSHION,LEG 701WPA0686 HOLDER,DECK 713WPAA037 GLASS,LED 735WPDA445 BUTTON,PLAY/STOP 711WPDA389 PLATE,DISPLAY 701WPA0680 HOLDER,DECK 755WPA0020 PLATE,COVER POWER 85OP700036 HOLDER,EOT SENSOR 702WSA0083 PLATE,BOTTOM 85OP700037 HOLDER,LED 722A08A090 SHEET,RATING...

  • Page 48: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4F201B420K DECK ASS'Y A4F201B420K 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 8107226504 SCREW,TAP TITE(S) BIND 2.6x5 85OA400227 PINCH ROLLER BLOCK 8107226404 SCREW,TAP TITE(S) BIND 2.6x4 85OA500026 AHC ASS'Y 8102120604 SCREW,PAN M2x6...

  • Page 49: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS COILS &TRANSFORMERS ! R502 R0G3K2335K RC 3.3M OHM 1/2W ! L501 029T000083 COIL,LINE FILTER 0R3A433F20 ! R512 R002T2333J RC 33K OHM 1/2W L504 02167E220K COIL ! R514 R3X181010J R,METAL OXIDE OHM 1W...
  • Page 50 M4F2-10B SPEC.NO. O/R NO. K184002...

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