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MVR4046A
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 MVR4046A

  • Page 1 MVR4046A 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.Broadcasting System System G-5.Color System...
  • 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 Stand by: W at AC 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 ( 8.4 lbs) G-30.Cabinet Material Cabinet Front: 94HB DECABROM...
  • Page 7 GENERAL SPECIFICATIONS G-41.Display Fluorescent Indicator Clock/Counter,Channel,Timer Rec,OTR,Play,Rec,FF(Cue),Rew(Rev), Pause,ATR,Eject WKL,Y.M.D,Start,End Repeat Memory Index On Screen Display Menu Clock Set( Calendar 24H) Timer Rec Set Auto Repeat On/Off CH Set TV/CATV Auto CH Memory ADD/Delete Sap On/Off No Noise Back Ground Language G-CODE(or SHOWVIEW or PLUSCODE)No.
  • Page 8 GENERAL SPECIFICATIONS G-44.Accessories Owner's Manual ( W/Guarantee Card) [English/French] 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 40 Key Ch Up Power Ch Down Eject Input Select Play Audio Select Stop TV/VCR F.FWD Pause/Still Slow Timer Rec Slow Speed Up...
  • 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 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 VR1001 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 X4001 3.579545MHz Q4008 BUFFER Q4007 Q4009 BUFFER Y/C/AUDIO/CCD/HEAD AMP IC BUFFER IC4001 LA71077BM-MPB 4FSC PULL VX01 SYSCON/SERVO/ TIMMING DRIVER CLAMP INPUT_SEL DECK TRICK_PB-H/EE-H H.SW DETAL EMPHA FM-EQ DOC_XO_CTL CLAMP CP4001 CONV C-LPF EP/LP-CH2 (L) Y-LPF EP/LP_COM EP/LP-CH1 (R) H.AMP YNR/...
  • Page 30: Hi-Fi

    SYSTEM CONTROL/SERVO/DECK BLOCK DIAGRAM TIMER SYSCON SERVO CONTROLLER IC IC1001 OEC0088A C. SYNC C. SYNC 54 POWER_ON-L POWER ON L POWER 4 FSC IN 53 4FSC POWER_FAIL POWER FAIL-H 4 FSC OUT 52 Q1007 CENT SW P. CON + 5V CENT LED REC/EE/PB REC/EE/PB...
  • Page 31 TUNER BLOCK DIAGRAM REAR OUT JACK HI-FI FRONT JACK J4201 J4203 Q4201 SYSCON/SERVO/ VIDEO_OUT BUFFER DECK TUNER_V Y/C/AUDIO/CCD/ P. CON + 12V HEAD AMP FRONT_V_IN RF-SW SW6001 FRONT_A_IN_R RF UNIT FRONT_A_IN_L TU6001 AUDIO_OUT_R HI-FI AUDIO_OUT_L Q4203 MUTE SW RF_CONV_A. OUT Q4204 Q4202 TUNER_A...
  • Page 32 HI-FI BLOCK DIAGRAM HI-FI AUDIO/HEAD AMP/DEM IC IC5501 AN3662FBP FRONT_A_IN-R INPUT SW FRONT_A_IN-L Y/C/AUDIO/CCD/ AUDIO_OUT_R TUNER OUTPUT HEAD AMP HF_COM 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/ DECK AUDIO_MUTE-H IIC_CLK P. CON + 12V LOGIC IIC_DATA ST_SELECT...
  • Page 33 OPERATION BLOCK DIAGRAM CP651 CP601 CD651 KEY-A KEY-A CH UP KEY-B KEY-B POWER OS651 CH DOWN SYSCON/SERVO/ REM_IN DECK STOP/EJECT D665 T-REC_LED REC/OTR D666 REC_LED FF/CUE AT + 5V PLAY D664 REW/REV TV/VCR_LED AT + 5V POWER D663 P. CON + 5V POWER BLOCK DIAGRAM TRANSFORMER SWITCHING...
  • Page 34: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) DECK SOLDER SIDE SOLDER SIDE S101 D664 D665 D666 D663 S105 CP101 S106 D524 R660 W076 OS651 CP651 S104 W140 J4203 Q101 C514 S103 S102 C503 Q1003 W139 Q509 C518 C519 C522 D513 C517 R523 SW606_3 W111...
  • Page 35 PRINTED CIRCUIT BOARDS SYSCON/OPERATION (CHIP MOUNTED PARTS) SOLDER SIDE R4004 C4068 R4021 R4009 R4204 R4072 Q4003 C4009 IC5501 R4015 R5517 C5530 R4018 C5507 R4070 R4047 IC4001 R6008 C4048 R1052 C4055 R4050 R4059 R4053 C515 C501 C507 Q1007 C1030 R1012 R1055 R1036 R1038 Q6001...
  • Page 36: Y/C/Audio/Ccd/Head Amp

    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 HI-FI BUFFER 2.2K FROM/TO TUNER Q4008 2SC1815Y TO_NORMAL_A FRONT_V_IN 4FSC FROM_NORMAL_A HF_COM TUNER_V Y/C/AUDIO/CCD/HEAD AMP IC IC4001 LA71077BM-MPB C4012 A-Vcc CLOCK C-GND ALWAYS...
  • Page 37 SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM (SYSCON PCB) FROM/TO POWER RECORD COLOR SIGNAL R1008 POWER_FAIL-AC POWER_FAIL RECORD LUMINANCE SIGNAL MODEVCC PLAYBACK COLOR SIGNAL POWER_ON-L PLAYBACK LUMINANCE SIGNAL AT+5V[M-CON] P.CON+5V AT+5V AT+12.6_V (S/S) (CAP) (LDM) FROM/TO HI-FI LOADING MOTOR DRIVER IC IC1002 BA6955AN V.REC_ST-H HIFI_ENV.DET CONTROL LOGIC...
  • Page 38 TUNER SCHEMATIC DIAGRAM (SYSCON PCB) RF-SW SW6001 SSAB110100 HI-FI FRONT JACK REAR OUT JACK J4201 J4203 TU6001 LPR1251-0500 JPJ4311-011432 TMDH2-A05A R6006 RF_CONV_A.OUT A.IN VIDEO OUT L6001 FROM/TO Y/C/AUDIO/CCD/HEAD AMP P.CON+5V TP4201 C4212 R4209 100uH 0305 FRONT_V_IN TV/VCR CONTROL R6004 V.IN 1K 1/4W TUNER_V C6001...
  • Page 39 POWER SCHEMATIC DIAGRAM (SYSCON PCB) TO HI-FI P.CON+5V P.CON+12V TO TUNER (TUNER) R529 +32V 330 1/4W T501_1 12.1 12.0 8122006 P.CON+12V P.CON+12V SW 12.7 Q512 2SD734 P.CON+5V D515 W835 AT+5V P.ON SW 1SS244 Q513 TO Y/C/AUDIO/CCD/HEAD AMP 12.7 DTC124EKA L501 R503 D505 P.CON+5V...
  • Page 40 OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) FROM POWER AT+5V P.CON+5V REW/REV SW607_3 SKQNAED010 FROM/TO SYSCON/SERVO PLAY SW606_3 REM_IN SKQNAED010 KEY-B KEY-A FF/CUE SW605_3 SKQNAED010 REC/OTR SW604_3 R658 TV/VCR_LED SKQNAED010 R659 T-REC_LED REC_LED R657 STOP/EJECT SW603_3 SKQNAED010 POWER SW608_3 SKQNAED010 CH DOWN CH UP SW602_3 SW601_3...
  • Page 41 HI-FI SCHEMATIC DIAGRAM (SYSCON PCB) C5514 C5521 R5519 0.22 3.3K 1/4W FROM/TO TUNER HI-FI AUDIO/HEAD AMP/DEM IC FRONT_A_IN-R IC5501 R5511 AN3662FBP FRONT_A_IN-L 2.2M AUDIO_OUT-R C5506 C5540 0.015 B DEM_BLK ZZ-PROM AUDIO_OUT-L PILOT LOGIC C5517 C5507 INPUT MUTE VCO-F0 RF_CONV_A.OUT 75uS HIFI ENV.
  • Page 42 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: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME NOTE: THE DC VOLTAGE AT EACH PART WAS CRITICAL FOR SAFETY,USE ONES...
  • Page 43 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 44: 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 45 WAVEFORMS HI-FI 16 PB 1V 5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 46: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW TU6001 J4201 PCB010 J4203 T501 (SYSCON PCB) PCB270 (OPERATION PCB)
  • Page 47: Chassis Exploded Views

    CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5001 H5002 M101 PCB550 (DECK PCB ASS'Y) NOTE: Applying positions AA, AB, AC, AD and BA for CLASS PART NO. MARK the grease or oil are displayed for this section. GREASE G-555G Check if the correct grease or oil is applied for G-488M each position.
  • Page 48 CHASSIS EXPLODED VIEW (BOTTOM VIEW) M2001 NOTE: Applying positions AA, AB, AC, AD and BA for CLASS PART NO. MARK the grease or oil are displayed for this section. GREASE G-555G Check if the correct grease or oil is applied for each position.
  • Page 49: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4C9A6B720 CABINET,FRONT ASS'Y 701WPJA799 CABINET,FRONT 711WPDA265 PLATE,DISPLAY 712WPJA572 FLAP 743WKAA001 SPRING,FLAP 735WPDA266 BUTTON,PLAY/STOP 735WPA0376 BUTTON,HOLDER 735WPDA267 BUTTON,FRAME 800WFA0020 CUSHION,LEG 701WPA0423 HOLDER,DECK 713WPA0086 GLASS,LED 704WPA0007 HOLDER,DECK (R) 752WSA0192 SHIELD,CASE HEAD AMP ASS'Y 800WR00071 RUBBER,SYSCON 8x15xT17.5 753WSA0124 SHIELD,COVER HEAD AMP...
  • Page 50: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4C931B420A DECK ASS'Y A4C931B420A 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 51: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS TRANSISTORS ! R502 R0G3K2335K RC 3.3M OHM 1/2W Q4009 TA5T010154 TRANSISTOR, SILICON 2SA1015Y(TPE2) ! R511 R3X181680J R, METAL OXIDE OHM 1W Q4201 TA5T010154 TRANSISTOR, SILICON 2SA1015Y(TPE2) ! R512 R002T2333J RC...
  • Page 52 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 53 M4C9-A6B SPEC.NO. B024009 O/R NO.

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