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Memorex MVR2040A Service Manual

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See also: Owner's Manual
MVR2040A
SERVICE MANUAL
VIDEO CASSETTE RECORDER
ORIGINAL
MFR'S VERSION A
Design and specifications are subject to change without notice.

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Summary of Contents for Memorex MVR2040A

  • Page 1 MVR2040A SERVICE MANUAL VIDEO CASSETTE RECORDER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.

  • Page 2: 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 3: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ..................A1-1 HOW TO ORDER PARTS ......................A1-1 CONTENTS ..........................A2-1 GENERAL SPECIFICATIONS ....................A3-1~A3-6 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B1-1 2. REMOVAL OF DECK PARTS .................... B2-1~B2-5 KEY TO ABBREVIATIONS ......................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS G-1. Outline of the Product -Speed 1/2" Video Cassette Recorder G-2. VCR Format VHS Standard NTSC SECAM PAL-M PAL-N VHS Hi-Fi Audio System G-3. Video Recording System : Rotary,slant azimuth two head helical scan system Luminance Component : FM recording Chrominance Component: Low frequency converted direct recording G-4.
  • Page 5 GENERAL SPECIFICATIONS G-17.Tuner and Receiving Channel Tuner: Contactless Electric Tuner Oscar(W/O HYPER) Oscar(W/ HYPER) France CATV Others Channel coverage 2 ~ 69 , 4A , A-5 ~ A-1 , A ~ I , J ~ W , W+1 ~ W+84 Tuning System Frequency syn.
  • Page 6 GENERAL SPECIFICATIONS G-26.Power Source AC 50Hz AC 60Hz G-27.Power Consumption: W at AC Hz(Approx.) Stand by: W at AC Hz(Approx.) Per Year: kWh / Year G-28.Dimensions(Approx.) 360 mm(W) mm(D) mm(H) G-29.Weight(Approx.) Kg ( 7.1 lbs) Gross Kg ( 10.2 lbs) G-30.Cabinet Material Cabinet Front: 94HB...
  • Page 7 GENERAL SPECIFICATIONS G-41.Display Fluorescent Indicator Clock/Counter,Channel,Timer Rec,OTR,Play,Rec,FF(Cue),Rew(Rev), Still,Pause,ATR,Eject,Stop WKL,Y.M.D,Start,End Repeat Memory Index On Screen Display Menu Clock Set( Calendar 24H) Timer Rec Set Auto Repeat On Off Sap On Off CH Set TV/CATV Auto CH Memory Add/Delete Language No Noise Back Ground G-CODE(or SHOWVIEW or PLUSCODE)No.
  • Page 8 GENERAL SPECIFICATIONS G-45.Accessories Owner's Manual ( W/Guarantee Card) [English/Spanish] Remote Control Unit Dew Caution Sheet Video Cassette Tape Battery (UM- 4 x 2 ) Safety Tip Toll Free Insert Sheet Guarantee Card Audio-Video Cord (RCA) Warning Sheet Quick Set-Up Sheet Information Sheet U/V Mixer 75 ohm Coaxial Cable (...
  • Page 9 GENERAL SPECIFICATIONS G-47.Remote Control Unit :RC-DC Glow in Dark Remocon Power Source : D.C V Battery UM - 4 x 2 Control Key :Total Ch Up Power Ch Down Eject Input Select Play Audio Select Stop TV/VCR F.FWD Pause/Still Slow Timer Rec Slow Speed Up REC/OTR...

  • Page 10: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS 1-3: DECK CHASSIS (Refer to Fig. 1-3) Remove the 3 screws 1. AND P.C. BOARDS Remove the screw 2. 1-1: TOP CABINET, FRONT CABINET AND Disconnect the following connectors: (CP1001, CP1002, OPERATION PCB (Refer to Fig. 1-1) CP1003, CP4001, CP4002 and CP4003).

  • Page 11: Removal Of Deck Parts

    DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DECK PARTS NOTE When you install the Tape Guide L, install as shown in the 2-1: TOP BRACKET (Refer to Fig. 2-1) circle of Fig. 2-3-B. (Refer to Fig. 2-3-B) Remove the 2 screws 1. Slide the 2 supports 2 and remove the Top Bracket.
  • Page 12 DISASSEMBLY INSTRUCTIONS 2-6: LINK ASS'Y (Refer to Fig. 2-6) 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) Set the Link Ass'y to the Eject position. Move the Inclined S Ass'y to the back side. Remove the (A) side of the Link Ass'y first, then remove Remove the Tension Spring.
  • Page 13 DISASSEMBLY INSTRUCTIONS 2-11: S REEL/T REEL (Refer to Fig. 2-11) NOTE Remove the S Reel and T Reel. Do not touch the Pinch Roller. (Use gloves.) Remove the 2 Polyslider Washers 1. When you install the Pinch Roller Block, install as shown in the circle of Fig.
  • Page 14 DISASSEMBLY INSTRUCTIONS 2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) Middle Gear Unlock the support 1 and remove the AHC Ass'y. E-Ring Remove the 3 screws 2. Remove the Cylinder Unit Ass'y. Main Cam NOTE Pinch Roller Cam When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y Joint Gear toward the left front direction.
  • Page 15 DISASSEMBLY INSTRUCTIONS 2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 2. When you install the Clutch Actuator, install as shown in the circle of Fig. 2-19-C. (Refer to Fig. 2-19-C) Remove the E-Ring 1 and remove the Main Loading Gear.

  • Page 16: 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 17 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 18: 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 both PLAY button and Initialization of the factory. CH UP button on the set for NOTE: Do not use this for the normal servicing. more than 2 seconds.

  • Page 19: 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 20 PREVENTIVE CHECKS AND SERVICE INTERVALS CLEANING NOTE 2. TAPE RUNNING SYSTEM After cleaning the heads with isopropyl alcohol, do not When cleaning the tape transport system, use the run a tape until the heads dry completely. If the heads gauze moistened with isopropyl alcohol. are not completely dry and alcohol gets on the tape, 3.

  • Page 21: Note For The Replacing Of Memory Ic

    NOTE FOR THE REPLACING OF MEMORY IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. ADDRESS DATA ADDRESS...

  • 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 Tension Adjust until the edge of the Tension the Cassette Tape to keep it steady when you want to Arm is positioning within 0.5mm range from the make the tape run without the Cassette Holder.
  • Page 24 MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM Operate within 4~5 seconds after the reel disk begins to turn. Tape Running Mechanism is adjusted precisely at the Install the Torque Gauge (JG002F) and Adapter (JG002B) factory.
  • 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 Adjust X value adjustment driver hole 2. Tension Arm P4 Post 3. Guide Roller T Brake Spring 4. P1 Post T Reel 5. Audio/Control Head S Reel D1-4...

  • Page 27: Electrical Adjustment

    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 T501 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 Q4007 BUFFER Q4008 X4001 3.579545MHz BUFFER Q4009 Y/C/AUDIO/CCD/ HEAD AMP IC BUFFER IC4001 LA71077BM-MPB 4FSC PULL SP/LP/EP-H VX01 SYSCON/ TIMMING CLAMP INPUT_SEL DRIVER SERVO/DECK TRICK_PB-H/EE-H H.SW DETAL FM-EQ EMPHA DOC_XO_CTL CLAMP CONV C-LPF Y-LPF CP4001 EP/LP_CH2 (L) H.AMP YNR/ B-UP...
  • Page 30 SYSTEM CONTROL/SERVO/DECK BLOCK DIAGRAM TIMER SYSCON SERVO CONTROLLER IC IC1001 OEC0089A POWER_ON-H POWER ON H C.SYNC C.SYNC 54 POWER POWER_FAIL POWER FAIL-H P_OFF-L 55 4FSC OSC 2 4 FSC OUT X1001 10MHz OSC 1 SP/LP/EP-H SP/LP/EP-H REC/EE/PB REC/EE/PB DUMMY_V.SYNC DUMMY V.SYNC H.SW H.SW C.ROTARY...

  • Page 31: Tuner Block Diagram

    TUNER BLOCK DIAGRAM MONO FRONT JACK REAR OUT JACK J4203 J4201 Q4201 SYSCON/ VIDEO_OUT BUFFER SERVO/DECK RF-SW AT_13T SW6001 FRONT_A_IN-L FRONT_V_IN Y/C/AUDIO/CCD/ TU6001 HEAD AMP TUNER_V TUNER_A FROM_NORMAL_A TV/VCR IIC_CLK SYSCON/ IIC_DATA SERVO/DECK AFT-S.CURVE +32V...

  • Page 32: Power Block Diagram

    OPERATION BLOCK DIAGRAM V651 7-MT_201GA 11 10 4 23 22 21 25 26 HEATER_DC- POWER HEATER_DC+ 6 17 11 31 30 5 CP601 CP651 KEY-A KEY-A CH-UP KEY-B KEY-B FL_CS CH-DOWN SYSCON/ FL_SD_OUT SERVO/DECK FIP DRIVER IC POWER IC 651 STOP/EJECT FL_S_CLK BU2977FS...

  • Page 33: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) DECK SOLDER SIDE SOLDER SIDE S101 S101 CP101 CP101 SW660 SW659 C656 S105 S105 OS651 V651 S106 S106 S104 S104 D524 J4203_1 CP651_1 Q101 Q101 W819 C514 S103 S103 S102 S102 C503 Q501 C519 C518 C506 D519...
  • Page 34 PRINTED CIRCUIT BOARDS SYSCON/OPERATION (CHIP MOUNTED PARTS) SOLDER SIDE R4004 R4024 C4068 R4021 R4009 C4202 R4204 R4072 Q4003 C4009 R4015 R4070 IC4001 R4047 R6008 C4048 C4055 R1052 R4050 R4059 R4053 C515 C501 C507 Q1007 C1030 R1012 R1055 R1036 R1038 C1011 R1048 R607 VEX905A...
  • Page 35 Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) L4002 100uH 0305 FROM POWER L4008 P.CON+5V 100uH 0305 BUFER Q4007 2SC1815Y R4065 FROM/TO TUNER 2.2K BUFFER Q4008 2SC1815Y FRONT_V_IN 4FSC FRONT_A_IN-L TUNER_V TUNER_A Y/C/AUDIO/CCD/HEAD AMP IC IC4001 FROM_NORMAL_A LA71077BM-MPB A-Vcc ALWAYS C-VCC 4Fsc CLOCK C-GND H.A GND...

  • Page 36: Y/C/Audio/Ccd/Head Amp

    SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM (SYSCON PCB) FROM/TO POWER R1008 POWER_FAIL-AC POWER_FAIL MODEVCC POWER_ON-H AT+5V[M-CON] P.CON+5V AT+5V AT+12.6_V (S/S) (CAP) (LDM) LOADING MOTOR DRIVER IC IC1002 BA6955AN CONTROL LOGIC RECORD COLOR SIGNAL POWER RECORD LUMINANCE SIGNAL SAVE PLAYBACK COLOR SIGNAL 11.9 PLAYBACK LUMINANCE SIGNAL 11.9 X1001...

  • Page 37: Tuner

    TUNER SCHEMATIC DIAGRAM (SYSCON PCB) RF-SW SW6001 SSAB110100 REAR OUT JACK MONO FRONT JACK J4201_1 J4203_1 TU6001 JPJ9911-010430 LPR1250-1600 TMDH2-A05A R6006 RF_CONV_A.OUT A.IN H1 H2 VIDEO OUT L6001 FROM/TO Y/C/AUDIO/CCD/HEAD AMP P.CON+5V TP4201 W811 C4212 R4209 100uH 0305 FRONT_V_IN TV/VCR CONTROL R6004 FRONT_A_IN-L...

  • Page 38: Power

    POWER SCHEMATIC DIAGRAM (SYSCON PCB) TO TUNER (TUNER) R529 +32V 330 1/4W AT_13V P.CON+5V D515 1SS244 TO Y/C/AUDIO/CCD/HEAD AMP L501 AC120V_60Hz D505 P.CON+5V 0R3A433F20 CD501 0R614902 1N4005E CP501 D508 THL-P03P-B1 1N4005E C502 WHITE D504 D523 500V 0.0027 FROM/TO SYSCON/SERVO 1N4005E 1N4005E L505 BLACK...
  • Page 39 OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) V651 7-MT-201GA SLPM 10 11 12 13 14 15 16 17 18 19 20 21 22 23 25 26 FROM POWER HEATER_DC- R662 HEATER_DC+ -30V AT+5V 32.0 32.0 32.0 32.0 32.0 32.0 -29.5 32.0 32.0 32.0 32.0 32.0...

  • Page 40: Deck

    DECK SCHEMATIC DIAGRAM LOADING MOTOR M101 S105 BOT SENSOR S106 Q101 RPT-38PB113 S101 S102 S103 S104 FROM/TO SYSCON/SERVO CP101 52044-0445 LDM+ LDM- PCB550 VE8851 CAUTION: SINCE THESE PARTS MARKED BY ATTENTION: LES PIECES REPAREES PAR UN ETANT NOTE: NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME THE DC VOLTAGE AT EACH PART WAS CRITICAL FOR SAFETY,USE ONES DANGEREUSES AN POINT DE VUE SECURITE...

  • Page 41: Interconnection Diagram

    INTERCONNECTION DIAGRAM HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR OPERATION PCB PCB270 VEX905 FULL ERASE HEAD ASS’Y H5002 HALL HALL SWITCH LOGIC CP1002 MOTOR_GND I LIMIT VCO(12V) CAP/M/F/R VCC(5V) CAPSTAN DD UNIT ASS’Y M2001 AC120V_60Hz CD501 HEAD AUDIO CONTROL ASS’Y CP501 H5001 CD1002...

  • Page 42: Waveforms

    WAVEFORMS Y/C/AUDIO/CCD/HEAD AMP SYSCON/SERVO 1 PB 6 PB 11 POWER ON 1V 0.2ms/div 2V 5ms/div 1V 50ns/div 2 POWER ON 7 PB 12 PB 100mV 0.1µs/div 1V 0.2ms/div 1V 0.2s/div 3 PB 8 PB 13 PB 200mV 1ms/div 1V 0.5ms/div 1V 0.2s/div 4 PB 9 PB...

  • Page 43: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4C8A1B720 CABINET,FRONT ASS'Y 701WPJA808 CABINET,FRONT 711WPDA266 PLATE,DISPLAY 712WPJA318 FLAP 743WKAA001 SPRING,FLAP 735WPA0358 BUTTON,STOPPER 735WPA0360 BUTTON,POWER 800WFA0041 CUSHION,LEG 701WPA0342 HOLDER,DECK (FIP) 723000A698 SHEET,DISPLAY 704WPA0007 HOLDER,DECK (R) 752WSA0192 SHIELD,CASE HEAD AMP ASS'Y 800WR00071 RUBBER,SYSCON (8x15xT17.5) 753WSA0124 SHIELD,COVER HEAD AMP 735WPDA181 BUTTON 2...

  • Page 44: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4C831B420A DECK ASS'Y A4C831B420A 8107126A04 SCREW,TAP TITE(S) PAN 2.6x10 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 85OA500022 AHC ASS'Y 8107226604 SCREW,TAP TITE(S) BIND 2.6x6 85OP200290 BELT,CAPSTAN (S) 8109126604 SCREW,TAP TITE(B) PAN 2.6x6 85OP900710 LEVER,REC...

  • Page 45: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS TRANSISTORS ! R502 R03102335J RC 3.3M OHM 1/2W Q4008 TC5T018154 TRANSISTOR, SILICON 2SC1815Y(TPE2) ! R508 R655U4331J R, FUSE 330 OHM 1/4W Q4009 TA5T010154 TRANSISTOR, SILICON 2SA1015Y(TPE2) ! R511 R3X181680J R, METAL OXIDE...
  • Page 46 ELECTRICAL REPLACEMENT PARTS LIST RESISTOR RC..... CARBON RESISTOR CAPACITORS CC..... CERAMIC CAPACITOR CE..... ALUMI ELECTROLYTIC CAPACITOR CP..... POLYESTER CAPACITOR CPP....POLYPROPYLENE CAPACITOR CPL....PLASTIC CAPACITOR CMP....METAL POLYESTER CAPACITOR CMPL....METAL PLASTIC CAPACITOR CMPP....METAL POLYPROPYLENE CAPACITOR J3-2...
  • Page 47 M4C8-A1B SPEC.NO. B034007 O/R NO.

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