1. Manuals
  2. Brands
  3. Memorex Manuals
  4. VCR
  5. MVR4042
  6. Service manual

Memorex MVR4042 Service Manual

Vhs, original mfr's version a
Hide thumbs Also See for MVR4042:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Owner's Manual
MVR4042
SERVICE MANUAL
VIDEO CASSETTE RECORDER
ORIGINAL
MFR'S VERSION A
Design and specifications are subject to change without notice.

Advertisement

Table of Contents
loading

Related Manuals for Memorex MVR4042

Summary of Contents for Memorex MVR4042

  • Page 1 MVR4042 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 TAPE REMOVAL METHOD AT NO POWER SUPPLY ............A1-1 CONTENTS ..........................A2-1 GENERAL SPECIFICATIONS ....................A3-1~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B1-1 2.

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS 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 NTSC SP / SLP...
  • Page 5 GENERAL SPECIFICATIONS Clock Set Yes (Calendar 12H) Language No Noise Back Ground Auto Clock Standard Time Daylight Saving Time G-CODE(or SHOWVIEW or PLUSCODE)No. Entry Stereo,Audio Output,SAP Play/Stop/FF/Rew/Rec/OTR(ITR)/T-Rec/Pause/Eject/Tape In (Symbol Mark) CH/AV(LINE) Clock Repeat Tape Counter Index Tape Speed ATR / Manual Tracking Zero Return Hi-Fi OSD Language...
  • Page 6 CM Skip (30sec x 6 Times) G-14 Accessories Owner's Manual Language English / Spanish w/Guarantee Card Buyer Model No. MVR4042 Remote Control Unit Dew Caution Sheet Video Cassette Tape Battery UM size x pcs Safety Tip Toll Free Insert Sheet...
  • Page 7 GENERAL SPECIFICATIONS Audio Output RCA x 2 (Stereo, White/Red) Euro Scart DC Jack 12V (Center +) VHF/UHF Antenna Input F Type AC Inlet G-16 Set Size Approx. W x D x H (mm) 360 ~226 ~95 G-17 Weight Net (Approx.) 3.2kg(7.1lbs) Gross (Approx.) 3.8kg(8.4lbs)

  • Page 8: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS 1-3: DECK CHASSIS (Refer to Fig. 1-3) AND P.C. BOARDS NOTE Do not remove the cable at the FE Head section. The FE 1-1: TOP CABINET, FRONT CABINET AND Head may be damaged if you remove the cable by force. OPERATION PCB (Refer to Fig.

  • Page 9: Removal Of Vcr Deck Parts

    DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF VCR DECK PARTS NOTE In case of the Locker R installation, check if the one 2-1: TOP BRACKET (Refer to Fig. 2-1) position of Fig.2-3-B is 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 10 DISASSEMBLY INSTRUCTIONS 2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A) 2-7: TENSION ASS'Y (Refer to Fig. 2-7-B) Turn the Pinch Roller Cam clockwise so that the Remove the screw (1). Remove the Loading Motor. Tension Holder hook is set to the position of Fig. 2-7-A Remove the Worm.
  • Page 11 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 section to remove it. Idler Arm Ass'y Unlock the 2 supports (1) and remove the T Brake Band.
  • Page 12 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. Cassette Opener Spring Position Fig. 2-11-B 2-12: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-12) Pinch Roller Block Remove the screw (1).
  • Page 13 DISASSEMBLY INSTRUCTIONS 2-14: CAPSTAN DD UNIT (Refer to Fig. 2-14-A) 2-15: MAIN CAM/PINCH ROLLER CAM/JOINT GEAR (Refer to Fig. 2-15-A) Remove the Capstan Belt. Remove the E-Ring (1), then remove the Main Cam. Remove the 3 screws (1). Remove the E-Ring (2), then remove the Pinch Roller Remove the Capstan DD Unit.
  • Page 14 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 Unit, Loading Arm T Unit and Main Loading Gear, align each marker. Remove the P4 Cap. (Refer to Fig. 2-16-B) Unlock the support (1) and remove the Cassette Guide Post.

  • Page 15: 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 16 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 17: 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 18 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 19: 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 20: Preventive Checks And Service Intervals

    PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Parts replacing time does not mean the life span for individual parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. The following list means standard hours, so the checking hours depends on the conditions.

  • Page 21: Servicing Fixtures And Tools

    SERVICING FIXTURES AND TOOLS (For 2 head model) (For 4 head 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 22: 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 section for the Tension Arm the Cassette Tape to keep it steady when you want to position so that the Tension Arm top is within the make the tape run without the Cassette Holder.
  • Page 23 MECHANICAL ADJUSTMENTS NOTE 1-4: CONFIRMATION OF VSR TORQUE 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 24 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 25 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 section for the Tension Arm position D2-4...

  • Page 26: 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 transistor, use only specified silicon grease (YG260M). (To prevent the damage to IC's and transistors.) 1-1: PG SHIFTER CONDITIONS MODE-PLAYBACK...
  • Page 27 ELECTRICAL ADJUSTMENTS 2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) A/C HEAD CP4002 AC IN CD501 CP4003 FE HEAD FE HEAD BOT PCB TP4001 CP1002 TP1002 TP1001 CD1503 CAPSTAN DD UNIT VR1001 CP1001 OS651 J4203 J4204 J4205 CP651 SYSCON PCB OPERATION PCB D3-2...

  • Page 28: Y/C/Audio/Ccd/Head Amp

    Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM X4001 3.579545 MHz Q4012 Q4010 BUFFER Y/C/AUDIO/CCD/HEAD AMP IC BUFFER IC4001 LA71206M-MPB 4FSC PULL VX01 Y/C_CS SYSCON/SERVO SERIAL Y/C_DATA TIMMING DRIVER CLAMP Y/C_CLK H.SW DECODER 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/...
  • Page 29 SYSTEM CONTROL/SERVO BLOCK DIAGRAM SYSCON/SOFTWARE/SERVO IC IC1001 OEC0130A P.CON+5V CV IN1 MS_SEN B CV IN2 OSD_V MS_SEN A Q1004 Q1005 4FSCIN/2FSCIN 4FSC Y/C_CLK Y/C_CLK MS SEN-A Y/C_DATA Y/C_DATA AT+5.2V MS SEN-B Y/C_CS Y/C_CS REEL SENSOR Q1002 DUMMY V.SYNC 109 DUMMY_V.SYNC REEL-T C.ROTARY C.ROTARY...

  • Page 30: Tuner Block Diagram

    TUNER BLOCK DIAGRAM FRONT AV JACK REAR OUT JACK AUDIO R VIDEO AUDIO L J4201 J4205 J4203 J4204 Q4201 VIDEO_OUT BUFFER SYSCON/SERVO RF_CH_SW TUNER_V Y/C/AUDIO/CCD/ P. CON + 12V HEAD AMP FRONT_V_IN FRONT_A_IN-R FRONT_A_IN-L AUDIO_OUT_R AUDIO_OUT_L HI-FI/ Q4203 DEMODULATOR TU6001 MUTE SW RF_CONV_A.
  • Page 31 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/ TUNER HF_COM OUTPUT CCD/ AUDIO_OUT_L HEAD AMP RF_CONV_A. OUT FROM_NORMAL_A TO_NORMAL_A TUNER_A VCO - F0 LOGIC FM LIM V. REC_ST-H BLOCK HIFI_ENV. DET HIFI_H. SW SYSCON/SERVO AUDIO_MUTE-H IIC_CLK LOGIC...

  • Page 32: Power Block Diagram

    OPERATION BLOCK DIAGRAM POWER CH-UP KEY-B CH DOWN KEY-A STOP/EJECT OS651 REM_IN REC/OTR AT+5.2V SYSCON/SERVO TV/VCR LED FF/CUE D664 1G/TV/VCR_LED PLAY T-REC LED D665 REW/REV 2G/T-REC_LED REC LED D666 3G/REC_LED POWER ON LED D663 4G/POWER_ LED POWER BLOCK DIAGRAM D505, D508, T501 D523, D528 L501...

  • Page 33: Printed Circuit Boards Syscon/Operation/Bot

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION/BOT (INSERTED PARTS) SOLDER SIDE D663 D665 D666 SW660 SW659 D664 J4204 J4205 J4203 D510 W864 R509 W056 W138 C522 W023 X1002 SW603_4 R602 L505_1 W021 R601 C520 W020 W132 W053 R604 R605 VR1001 R603 SW605 W130 W852 Q1004 W129...
  • Page 34 PRINTED CIRCUIT BOARDS SYSCON (CHIP MOUNTED PARTS) SOLDER SIDE C6005_1 R6005 R6006 C4208 C5510 R5514 R4005 C5529 Q4002 C5544_1 R4003 C5543_1 C5517 C4074 Q4001 C4029 C5541 R4021 R4053 R4212 C5542 W814 C4013 C4033 C5537 Q4203 Q4204 W812 R4207 R4012 R4024 R5503 C4015 Q4202...

  • Page 35: Y/C/Audio/Ccd/Head Amp

    Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) BUFFER Q4012 KTC3875S_Y_RTK R4041 1.8K FROM POWER P.CON+5V FROM TUNER C4058 FRONT_V_IN 6.3V C4059 TUNER_V R4038 C4061 FROM/TO HI-FI/DEMODUTATOR 680K 0.01 B 4FSC TO_NORMAL_A FROM_NORMAL_A HF_COM BUFFER C4016_1 COMP OUT ALWAYS 4Fsc CLOCK Q4010 AUDIO C-ROT C-GND...

  • Page 36: System Control/Servo

    SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM FROM/TO POWER (SYSCON PCB) POWER_FAIL LED_VCC POWER_ON-L AT+5V[M-CON] P.CON+5V AT+5.2V AT+12.6_V RESET (S/S) JG1002 JG1005 JG1004 JG1003 (MOTOR) JG1001 (LED) FROM/TO HI-FI/DEMODULATOR C1074 C1076 V.REC_ST-H 18P CH 12P CH HIFI_ENV.DET C1001 HIFI_H.SW X1004 FROM/TO DECK AUDIO_MUTE-H 100BT01004 CP1001 IIC_CLK...

  • Page 37: Power

    POWER SCHEMATIC DIAGRAM TO HI-FI/DEMODULATOR (SYSCON PCB) P.CON+5V +12V TO TUNER (TUNER) R549 +32V 330 1/4W 13.2 12.0 +12V P.CON+12V SW 12.7 Q512 KTC3203_Y AT+5.2V P.CON+5V P.ON SW D521 R525 Q513 KRC103SRTK 1SS244 1/4W TO Y/C/AUDIO/CCD/HEAD AMP 12.7 R503 COIL LINE FILTER L501 P.CON+5V D505...

  • Page 38: Operation

    OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) REW/REV SW607 EVQ21505R PLAY SW606_4 EVQ21505R FF/CUE SW605 EVQ21505R FROM/TO SYSCON/SERVO 1G/TV/VCR_LED 2G/T-REC_LED 3G/REC_LED 4G/POWER_LED REC/OTR POWER SW604_4 SW608 REM_IN KEY-B EVQ21505R EVQ21505R R658 KEY-A 1G/TV/VCR_LED CD651 CP601 CP651 SM1382-001-1B 560 1/4W B2013H02-3P A2001WV2-3P R659 2G/T-REC_LED KEY-A KEY-A...

  • Page 39: Tuner

    TUNER SCHEMATIC DIAGRAM (SYSCON PCB) REAR OUT JACK J4201_2 MSP-213V1-432_PBSN TU6001 115-V-H015AR R6006 RF_CONV_A.OUT A.IN RF_CH_SW L6002 VIDEO OUT P.CON+5V TP4201 22uH 0305 TV/VCR CONTROL R6004 V.IN 1/4W R4212 AUDIO_OUT-R C4209 R4206 AUDIO_OUT-L IIC_CLK_A R4201 R4207 CLOCK AT+5.2V MUTE SW MUTE SW 4701/2W Q4204...
  • Page 40 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 C5501 C5507 C5537 INPUT MUTE VCO-F0 75uS DE-EMPH...

  • Page 41: Interconnection Diagram

    INTERCONNECTION DIAGRAM HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR BOT SENSOR FULL ERASE HEAD ASS’Y Q1008 H5002 LOADING MOTOR M101 HALL HALL BOT PCB SWITCH PCB370 LOGIC VEBA04 CP1001 GND[M] CAP_VCO CAP/M/F/R LD/CY VCO AC120V_60Hz LDM_CTL CD501 CYL_CTL WHITE CYL FG/PG S502 CAP_CTL...

  • Page 42: Waveforms

    WAVEFORMS Y/C/AUDIO/CCD/HEAD AMP SYSCON/SERVO 1 POWER ON 6 POWER ON 12 FF/REW 500mV 10µs/div 1V 5ms/div 2V 5ms/div 2 POWER ON 7 PB 14 POWER OFF 100mV 100ns/div 1V 2µs/div 2V 5ms/div POWER 3 PB 8 POWER ON 15 PB 100mV 1ms/div 1V 500µs/div 50V 2µs/div...

  • Page 43: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB010 (SYSCON PCB ASS'Y) PCB370 (BOT PCB ASS'Y) 101C 101F PCB270 101H (OPERATION PCB ASS'Y) 101G 101I 101E 101B 101A 101G 101D I1-1...

  • Page 44: Chassis Exploded Views

    CHASSIS EXPLODED VIEW (TOP VIEW) CD1501 M2003 UN4001 H5002 H5001 CD1502 M101 Applying positions AA, AB, AD and AEfor the NOTE: CLASS PART NO. MARK grease are displayed for this section. GREASE G-555G Check if the correct grease is applied for each MG-33 position.
  • Page 45 CHASSIS EXPLODED VIEW (BOTTOM VIEW) CD1503 M2001 CD1501 CD1502 NOTE: Applying positions AA, AB, AC and AD for the CLASS PART NO. MARK grease are displayed for this section. GREASE G-555G Check if the correct grease is applied for each position.

  • Page 46: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4F907D720 CABINET,FRONT ASSY 101A 701WPJC208 CABINET,FRONT 101B 711WPDA590 PLATE,DISPLAY 101C 712WPJB778 FLAP 101D 735WPDA571 BUTTON,DECK 101E 735WPDA572 BUTTON,FRAME 101F 743WKA0039 SPRING,FLAP 101G 800WFA0045 CUSHION,LEG 101H 713WPAA036 GLASS,LED 101I 735WPAA194 HOLDER,CHANNEL 702WSB0071 CABINET,TOP(VA) 722A08A139 SHEET,RATING 755WPA0034 PLATE,COVER POWER...

  • Page 47: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4F908D420K DECK ASS'Y A4F908D420K 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 83ETW30000 E-RING 85OA400234 PINCH ROLLER BLOCK 8107226404 SCREW,TAP TITE(S) BIND 2.6x4 85OP900746 BRACKET,TOP 3V 8102120604 SCREW,PAN M2x6 85OP200290 BELT,CAPSTAN (S) 8109126604 SCREW,TAP TITE(B) PAN...

  • Page 48: 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 L504 021W7A220K COIL ! R512 R002T2333J 33K OHM 1/2W L505 021W7A220K COIL ! R514 R3X181010J R,METAL OXIDE OHM 1W L1001 0216A6120K...
  • Page 49 M4F9-07D SPEC.NO. K344008 O/R NO.

Table of Contents