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Memorex MVR2041 Service Manual

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MVR2041
SERVICE MANUAL
VIDEO CASSETTE RECORDER
ORIGINAL
MFR'S VERSION A
Design and specifications are subject to change without notice.

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  • Page 1 MVR2041 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 A1-1 SERVICING NOTICES ON CHECKING ..................A1-1 HOW TO ORDER PARTS ......................A2-1 CONTENTS ..........................A3-1~A3-4 GENERAL SPECIFICATIONS ....................DISASSEMBLY INSTRUCTIONS B1-1 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B2-1~B2-5 2. REMOVAL OF DECK PARTS .................... C1-1, C1-2 KEY TO ABBREVIATIONS .......................

  • Page 4: 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-6S Loading System Front Motor Heads Video Head 4Head FM Audio Head Normal Audio /Control Mono Erase(Full Track Erase) Tape Speed NTSC...
  • Page 5 GENERAL SPECIFICATIONS G - 5 Interface Switch Front Power Play Pause/Still System Select One Touch Playback Channel Up Channel Down F.FWD/Cue Eject/Stop Main Power SW Volume Up Volume Down Rew/Rev Rec/OTR Rear RF Output SW Indicator Power Stand by Rec/OTR Repeat Tape In Kurupika Guide...
  • Page 6 GENERAL SPECIFICATIONS G - 1 3 Display Indicator Indicator Type LED Module Clock/Counter,CH,Timer Rec,OTR, Play Rec,FF(Cue),Rew(Rev),Stop,ATR Pause("Rec"Flash) Still("Play"Flush) Eject(Tape Mark Flash) Slow WKL,Y.M.D,Start,End Repeat A-DUB Memory Index F1,F2 RF Output CH TAPE IN G - 1 4 Clock,Timer Calendar 1990/1/1 ~ 2081/12/31 and Timer Timer Events 8 prog/1 month...
  • Page 7 GENERAL SPECIFICATIONS G - 1 6 Features Auto Head Cleaning Auto Tracking Index Search HQ (VHS Standard High Quality) Auto Power On, Auto Play, Auto Rewind, Auto Eject Auto Power Off Forward/Reverse Picture Search VIDEO PLUS+(SHOWVIEW,G-CODE) One Touch Playback Picture Control Auto Preset Channel Lock Hotel Lock...

  • Page 8: Disassembly Instructions

    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) Slide the 2 supports 1 and remove the Top Bracket. Top Bracket Tape Guide L Top Bracket...
  • Page 9 DISASSEMBLY INSTRUCTIONS 2-6: LINK UNIT (Refer to Fig. 2-6) Tension Adjust Set the Link Unit to the Eject position. Remove the (A) side of the Link Unit first, then remove Tension Band Ass'y the (B) side. Tension Spring Tension Arm Ass'y Link Unit Tension Holder SS Brake Spring...
  • Page 10 DISASSEMBLY INSTRUCTIONS 2-10: S REEL/T REEL (Refer to Fig. 2-10) 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 11 DISASSEMBLY INSTRUCTIONS 2-14: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-14) 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 12 DISASSEMBLY INSTRUCTIONS 2-18: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-18-A) 2. When you install the Clutch Actuator, install as shown in the circle of Fig. 2-18-C. (Refer to Fig. 2-18-C) Remove the E-Ring 1 and remove the Main Loading Gear.

  • Page 13: 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 14 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 15: 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 16: 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 17: 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 18: 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 19 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 20 MECHANICAL ADJUSTMENTS 2-2: CONFIRMATION AND ADJUSTMENT OF 2-3: TAPE RUNNING ADJUSTMENT AUDIO/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 21 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 22: 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 23 ELECTRICAL ADJUSTMENTS 2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE J4205 J4203 TP1001 T501 VR1001 TU6001 TP4001 TP1002 TP4201 J4201 SYSCON PCB D2-2...

  • Page 24: Y/C/Audio/Ccd/Head Amp

    Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM X4001 3.579545MHz Q4012 Q4010 BUFFER Y/C/AUDIO/CCD/HEAD AMP IC BUFFER IC4001 LA71200M-MPB VX01 PULL Y/C_CS SERIAL SYSCON/SERVO/ TIMMING CLAMP Y/C_DATA DRIVER TIMER/DECK DECODER Y/C_CLK H.SW DETAL EMPHA FM-EQ CLAMP CP4001 CONV C-LPF EP/LP-CH2 (L) Y-LPF EP/LP_COM EP/LP-CH1 (R) H.AMP YNR/ Main...

  • Page 25: Power

    SYSTEM CONTROL/SERVO/TIMER/DECK BLOCK DIAGRAM SYSCON/SERVO/TIMER IC IC1001 OEC8071A SENS LED Y/C CLK 14 Y/C_CLK Q1003 MS SEN-A AT + 5.2V Y/C CS 15 Y/C_CS SENSOR SW MS SEN-B Y/C DATA Y/C_DATA MS_SEN B DUMMY V.SYNC MS_SEN A DUMMY_V.SYNC Q1004 Q1005 C.ROTARY C.ROTARY CV IN...

  • Page 26: Tuner Block Diagram

    TUNER BLOCK DIAGRAM FRONT AV JACK REAR OUT JACK VIDEO J4201 J4203 FRONT AV JACK MONO AUDIO Q4201 J4205 SYSCON/SERVO/ VIDEO_OUT BUFFER TIMER/DECK P.CON + 12V FRONT_V_IN FROM_NORMAL_A Y/C/AUDIO/CCD HEAD AMP FRONT_A_IN-L TUNER_V TUNER_A TU6001 RF_CH_SW TV/VCR IIC_CLK IIC_DATA SYSCON/SERVO/ TIMER/DECK AFT-S.CURVE...

  • Page 27: Power Block Diagram

    POWER BLOCK DIAGRAM T501 +32V P.CON +12V Q506 P.CON P.CON + 5V +5V SW IC501 KIA431 D505, D508, VOLTAGE D523, D528 CTL IC Q508 Q503 Q502 Q511 P.ON SW PHOTO CONTROL COUPLER Q515 AT +5V(M-CON) M-CON B+ SW Q505 PHOTO COUPLER POWER_ON-H SYSCON/SERVO/...
  • Page 28 OPERATION BLOCK DIAGRAM V651 LTG-Y2K22M-J 15 14 13 12 11 10 9 Q651 5G SW Q652 SEG10 SW SEG_10 Q653 SEG9 SW SEG_9 Q654 4G SW Q655 SEG_8 SEG8 SW Q656 SEG7 SW SEG_7 Q657 SEG6 SW SEG_6 SYSCON/SERVO/ Q658 TIMER/DECK SEG5 SW SEG_5...

  • Page 29: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) DECK SOLDER SIDE SOLDER SIDE S101 CP101 SW660 SW659 S105 J4205_1 S106 V651 CP651_1 S104 W056 S103 Q101 C520 W160 W055 R521 S102 D512 W092 Q515 Q506 W818 W851 W852 W090 R530 SW608 R1019 W089 D501 C514...
  • Page 30 PRINTED CIRCUIT BOARDS SYSCON (CHIP MOUNTED PARTS) SOLDER SIDE R4007 R4014 R4006 R6006 R4001 Q4003 C4015 R1061 R1004 C4019 IC4001 R4202 R1010 C1011 C4064 C4061 R4038 C4054 C4060 R4039 Q4010 Q4012 R1016 C6014 R1014 R516 C507 C529 R527 R518 C1040 C1054 C1053 R1032...
  • Page 31 Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) BUFFER Q4012 2SC2412K R4041 1.8K FROM POWER P.CON+5V FROM/TO TUNER C4058 FRONT_V_IN 6.3V FRONT_A_IN-L C4059 TUNER_V 0.1 F R4038 C4061 TUNER_A 680K 0.01 B FROM_NORMAL_A BUFFER C4016_1 COMP OUT ALWAYS 4Fsc CLOCK AUDIO C-ROT C-GND C-VCC SERAIL...
  • Page 32 SYSTEM CONTROL/SERVO/TIMER SCHEMATIC DIAGRAM FROM/TO POWER (SYSCON PCB) P.CON+5V AT+12.6_V FROM/TO Y/C/AUDIO/CCD/HEAD AMP CAP_VCO AT+5V[M-CON] FF/REW SW Y/C_CLK AT+5.2V Q1010 KRC103RTK Y/C_CS P.SAVE_OFF_5V Y/C_DATA POWER_FAIL DUMMY_V.SYNC MODE_VCC V.REC_ST-H C.ROTARY POWER_ON-H (S/S) AUDIO_MUTE-H C1038 (CAP) OSD_V 0.0022 Y CTL- R1026 C1040 (CYL/LDM) AT+5V[M-CON] CTL+...
  • Page 33 TUNER SCHEMATIC DIAGRAM (SYSCON PCB) TU6001 REAR OUT JACK TMDH2-A34A J4201_1 AV2-15D-2 R6006 RF_CONV_A.OUT A.IN H1 H2 W853 RF_CH_SW VIDEO OUT W844 TP4201 W811 TV/VCR CONTROL R6004 V.IN 1K 1/4W W803 FROM_NORMAL_A W816 RF_CONV_A.OUT RF AGC C4209 IIC_CLK R4201 CLOCK P.CON+12V 470 1/2W IIC_DATA...

  • Page 34: Power

    POWER SCHEMATIC DIAGRAM (SYSCON PCB) TO TUNER R549 +32V 330 1/4W P.CON+12V W837 P.CON+5V (TUNER) TO Y/C/AUDIO/CCD/HEAD AMP D521 1SS244 P.CON+5V L501 D505 0R3A433F20 AC120V_60Hz CD501 1N4005-EIC 07414902 D508 WHITE S502 1N4005-EIC D523 BLACK S501 1N4005-EIC C504 275V 0.022 FH501 FH502 PHE840 EYF-52BC...
  • Page 35 OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) V651 LTG-Y2K22M-J 1G SW Q665 2SA1037AK FROM POWER SEG1 SW Q664 AT+5.2V KRC103RTK AT+5.2V_A R674 REW/REV SEG2 SW (FIP) SW607 Q663 (SYS) KRC103RTK SKQNAED010 R673 SEG3 SW 5G SW Q662 Q651 KRC103RTK 2SA1037AK R672 FROM/TO SYSCON/SERVO/TIMER PLAY 2G SW SEG10 SW...
  • Page 36 DECK SCHEMATIC DIAGRAM (DECK PCB) LOADING MOTOR M101 S105 BOT SENSOR S106 Q101 RPT-38PB113 S101 S102 S103 S104 FROM/TO SYSCON/SERVO/TIMER CP101 52044-0445 LDM+ LDM- PCB550 VE8851 NOTE: THE DC VOLTAGE AT EACH PART WAS CAUTION: SINCE THESE PARTS MARKED BY ATTENTION: LES PIECES REPAREES PAR UN ETANT...

  • Page 37: Interconnection Diagram

    INTERCONNECTION DIAGRAM FULL ERASE HEAD ASS’Y H5002 HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR OPERATION PCB PCB270 VEX927 HALL HALL SWITCH LOGIC CP1002 MOTOR_GND I LIMIT AC120V_60Hz CD501 VCO(12V) CAP FG CAP/M/F/R WHITE S502 VCC(5V) CAPSTAN DD UNIT ASS’Y M2001 BLACK S501...

  • Page 38: Waveforms

    WAVEFORMS SYSCON/SERVO/TIMER Y/C/AUDIO/CCD/HEAD AMP POWER POWER ON 10µs 500mV/div 200ms 1.0V/div 2µs 50.0V/div 2 POWER ON 200ms 1.0V/div 100ns 100mV/div 3 PB POWER ON 1ms 100mV/div 50ns 500mV/div 500µs 200mV/div 500µs 1.0V/div 11 PB 5 REC 5µs 20.0V/div 200µs 1.0V/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 39: Mechanical Exploded View

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

  • Page 40: Chassis Exploded Views

    CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5001 H5002 M101 PCB550 (DECK PCB ASS'Y) NOTE: Applying positions AA, AB, AC and BA for the CLASS PART NO. MARK grease or oil are displayed for this section. GREASE G-555G Check if the correct grease or oil is applied for each position.
  • Page 41 CHASSIS EXPLODED VIEW (BOTTOM VIEW) M2001 NOTE : Applying positions AA, AB, AC and BA for the CLASS PART NO. MARK grease or oil are displayed for this section. GREASE Check if the correct grease or oil is applied for G-555G each position.

  • Page 42: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4E315B720 CABINET,FRONT ASS'Y 701WPJB115 CABINET,FRONT 711WPDA266 PLATE,DISPLAY 712WPJA810 FLAP 735WPAA222 BUTTON,STOPPER 735WPAA221 BUTTON,POWER 735WPDA397 BUTTON 1 735WPDA398 BUTTON 2 743WKA0032 SPRING,FLAP 800WFA0045 CUSHION,LEG 752WSA0230 SHIELD,CASE HEAD AMP 753WUAA006 SPRING,EARTH HEAD AMP 702WPA0779 PLATE,JACK (2PIN) 755WPA0019 PLATE,COVER POWER (VA) 85OP700036 HOLDER,EOT SENSOR...

  • Page 43: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4E304C420K DECK ASS'Y A4E304C420K 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 44: 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 Q4010 T6YJ1037K0 TRANSISTOR, SILICON 2SA1037AKT146(R,S) ! R512 R002T2333J RC 33K OHM 1/2W Q4012 T8YJ2412K0 TRANSISTOR, SILICON 2SC2412KT146(R,S) ! R514 R3X181010J R, METAL OXIDE OHM 1W...
  • Page 45 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 J 3 - 2...
  • Page 46 SPEC.NO. M4E3-15B K144003 O/R NO.
  • Page 47 MVR2041 SERVICE MANUAL VIDEO CASSETTE RECORDER REVISION 1 MFR’S VERSION B MFR’S VERSION IC4001 LA71200M-MPB LA71201M-MPB Please file this revision with the original version.
  • Page 48 Change of IC ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION A MFR'S VERSION B PART NO. DESCRIPTION PART NO. DESCRIPTION REF. NO. IC4001 I03F3200M0 IC LA71200M-MPB I03F3201M0 IC LA71201M-MPB C4033 CS0RB0413K CC 0.001 UF 50V B CS0RB04B3K CC 0.0012UF 50V B R4021 R903N8223J RC 22K OHM 1/8W...

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