Summary of Contents for Memorex MVR2031
- Page 1 MVR2031 SERVICE MANUAL VIDEO CASSETTE RECORDER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.
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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~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B1-1 2. REMOVAL OF DECK PARTS ....................B2-1~B2-6 3. -
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 Normal Audio /Control Mono / Yes Erase(Full Track Erase) Tape Speed NTSC SP/SLP Play... - Page 5 GENERAL SPECIFICATIONS Pin Code Registration System Set-Up Clock Set Yes (Calendar 12H) Language No Noise Back Ground G-CODE(or SHOWVIEW or PLUSCODE)No. Entry NICAM 1/2,NICAM Off,Audio Output Stereo,Audio Output,SAP Play/Stop/FF/Rew/Rec/OTR/T-Rec/Pause/Eject/Tape In (Symbol Mark) CH/AV Clock Repeat Pin Code Tape Counter Index Hotel Lock Tape Speed Manual Tracking (Bar Setting)
- Page 6 GENERAL SPECIFICATIONS Rec/OTR Eject Counter Reset Speed Timer Rec TV Monitor Quick View Program Slow Auto Tracking Set/Tracking+ Set/ Tracking - Menu Enter Cancel Call TV/VCR Sleep Timer Muting Clock/Counter Zero Return CM Skip Audio Select G-13 Features Auto Head Cleaning Auto Tracking Index Search HQ (VHS Standard High Quality)
- Page 7 GENERAL SPECIFICATIONS AV Cord (2Pin-1Pin) Registration Card PTB Sheet Tape Rewinder(Buyer Supply) 300 ohm to 75 ohm Antenna Adapter G-15 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...
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Page 8: 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 9: 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 10 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 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 Idler Arm Ass'y section to remove it. Unlock the 2 supports 1 and remove the T Brake S Reel 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. A/C Head Cassette Opener A/C Head Spring Pinch Roller Block A/C Head Base P5 Arm Ass'y •...
- Page 13 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 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 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.
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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.
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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...
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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. 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 21: 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 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 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 23 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 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 parts for the Tension Arm position D1-4...
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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 transistors, use only specified silicon grease (YG6260M). (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 TP1001 J4205 J4203 T501 VR1001 TU6001 TP4001 TP1002 TP4201 J4201 SYSCON PCB D2-2...
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Page 28: Y/C/Audio/Ccd/Head Amp
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM X4001 100CT3R508 Q4012 BUFFER Q4010 Y/C/AUDIO/CCD/HEAD AMP IC IC4001 BUFFER LA71201M-N-MPB VX01 PULL Y/C_CS SERIAL TIMMING IIC_DATA SYSCON/SERVO DRIVER CLAMP DECODER IIC_CLK H.SW DETAL EMPHA FM-EQ CLAMP CONV C-LPF Y-LPF CP4001 1 EP/LP_CH2 (L) H.AMP EP/LP_COM YNR/ Main 3.58M... -
Page 29: System Control/Servo
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 30 TUNER BLOCK DIAGRAM FRONT AV JACK VIDEO MONO AUDIO REAR OUT JACK J4203 J4205 J4201 Q4201 SYSCON/SERVO VIDEO_OUT BUFFER TUNER_V P. CON + 12V FRONT_V_IN RF-SW SW6001 Y/C/AUDIO/CCD HEAD AMP FRONT_A_IN-L FROM_NORMAL_A TUNER_A TU6001 TV/VCR IIC_CLK IIC_DATA SYSCON/SERVO AFT-S. CURVE...
- Page 31 OPERATION BLOCK DIAGRAM CH UP CP651 CP601 CH DOWN KEY-A KEY-A KEY-B KEY-B OS651 STOP/EJECT REM_IN REC/OTR TV/VCR LED D664 SYSCON/SERVO 1G/TV/VCR_LED FF/CUE T_REC LED D665 PLAY 2G/T-REC_LED REC LED REW/REV D666 3G/REC_LED POWER POWER BLOCK DIAGRAM T501 +32V P. CON +12V Q506 P.
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Page 32: Printed Circuit Boards
PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) SOLDER SIDE SW660 SW659 D663 D664 D665 D666 W864 L505_1 C520 W113 C514 J4205_1 OS651 R1043 Q506 W036 CP651_1 D514 Q515 X1001_1 Q508 C502 R604 D512 SW608 SW605 W029 SW604_1 D520 D501 W033 W150 D525 W851 W034... - Page 33 PRINTED CIRCUIT BOARDS SYSCON/OPERATION (CHIP MOUNTED PARTS) SOLDER SIDE R4006 R6006 R4202 C4020 R4016 C4028 Q4003 C4015 R4021 C4032 C4019 IC4001 R4039 C4061 C4060 C6014 Q4012 R516 Q4010 C4054 R4036 R4034 Q4011 R4046 R4044 Q1007 R1017 R1045 R1044 C1054 R1015 R607 IC1003 R1083...
- Page 34 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 FRONT_A_IN-L C4059 TUNER_V 0.1 F R4038 C4061 TUNER_A 680K 0.01 B FROM_NORMAL_A BUFFER Q4011 2SC2412K 4FSC BUFFER C4016_1 COMP OUT ALWAYS 4Fsc CLOCK AUDIO...
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Page 35: Y/C/Audio/Ccd/Head Amp
SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM FROM/TO POWER (SYSCON PCB) POWER_FAIL LED_VCC POWER_ON-H AT+5V[M-CON] P.CON+5V AT+5.2V AT+12.6_V (S/S) (MOTOR) (LED) C1001 FROM/TO Y/C/AUDIO/CCD/HEAD AMP 4FSC FROM/TO DECK L1002_1 IIC_CLK X1001_1 CP1001 1002T01003 TMC-J12P-B2 IIC_DATA 22uH L1001 CAP_FG CAP_FG Y/C_CS R1033 15uH CAP_VCO DUMMY_V.SYNC W808 R1003... -
Page 36: Power
POWER SCHEMATIC DIAGRAM (SYSCON PCB) 1.6A 125V CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE 1.6A 125V (F501) TO TUNER ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE (TUNER) N’UTILISER QUE DES FUSIBLE DE MEME TYPE 1.6A 125V (F501) R549 +32V... -
Page 37: Operation
OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) REW/REV SW607 SKQNAED010 PLAY SW606_1 SKQNAED010 FF/CUE SW605 SKQNAED010 FROM/TO SYSCON/SERVO REC/OTR SW604_1 1G/TV/VCR_LED 2G/T-REC_LED SKQNAED010 3G/REC_LED POWER REM_IN SW608 KEY-B SKQNAED010 KEY-A R658 1G/TV/VCR_LED STOP/EJECT CP601_1 CP651_1 SW603_1 560 1/4W R659 B2013H02-3P A2001WV2-3P CD651 2G/T-REC_LED KEY-A KEY-A... -
Page 38: Tuner
TUNER SCHEMATIC DIAGRAM (SYSCON PCB) RF-SW SW6001 SLD-12-592 TU6001 TMDH2-A34A REAR OUT JACK R6006 RF_CONV_A.OUT J4201_3 A.IN H1 H2 MSP-382V-18 PBSN 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_A R4201 CLOCK 470 1/2W... -
Page 39: Interconnection Diagram
INTERCONNECTION DIAGRAM HALL MAIN ROTOR FULL ERASE HEAD ASS’Y SENSOR COIL MAGNET FG SENSOR H5002 LOADING MOTOR M101 OPERATION PCB HALL HALL SWITCH PCB270 LOGIC VEA958 CP1001 CAP _FG CAP _VCO AC120V_60Hz CAP/M/ F/R CD501 I_LIMIT GND(M) WHITE S502 LD/CY_VCO BLACK CAP _CTL S501... -
Page 40: 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 41: Mechanical Exploded View
MECHANICAL EXPLODED VIEW J4201 TU6001 PCB010 (SYSCON PCB) J4203 T501 J4205 PCB270 (OPERATION PCB) -
Page 42: 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 43 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...
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Page 44: Mechanical Replacement Parts List
MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4F103B720 CABINET,FRONT ASS'Y 701WPJB403 CABINET,FRONT 711WPDA409 PLATE,DISPLAY 712WPJB134 FLAP 735WPAA222 BUTTON,STOPPER 735WPAA221 BUTTON,POWER 735WPDA397 BUTTON 1 735WPDA398 BUTTON 2 743WKA0032 SPRING,FLAP(COMBO) 800WFA0045 CUSHION,LEG 713WPAA036 GLASS,LED 701WPA0680 HOLDER,DECK 755WPA0020 PLATE,COVER POWER 85OP700036 HOLDER EOT SENSOR 702WSA0086 PLATE,BOTTOM... -
Page 45: Chassis Replacement Parts List
CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4F101B420K DECK ASS'Y A4F101B420K 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 46: 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 L6002 02167F220J COIL ! R512 R002T2333J 33K OHM 1/2W L6003 0216A6150K COIL ! R514 R3X181010J R,METAL OXIDE OHM 1W ! T501 0481220094... - Page 47 M4F1-03B SPEC.NO. K184015 O/R NO.