1. Manuals
  2. Brands
  3. Memorex Manuals
  4. Cassette Player
  5. MVP0028
  6. Service manual

Memorex MVP0028 Service Manual

Video cassette player
Hide thumbs Also See for MVP0028:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Owner's Manual
MVP0028
SERVICE MANUAL
VIDEO CASSETTE PLAYER
ORIGINAL
MFR' VERSION A
Design and specifications are subject to change without notice.

Advertisement

Table of Contents
loading

Related Manuals for Memorex MVP0028

Summary of Contents for Memorex MVP0028

  • Page 1 MVP0028 SERVICE MANUAL VIDEO CASSETTE PLAYER ORIGINAL MFR’ 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 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~B2-5 3.
  • Page 4 GENERAL SPECIFICATIONS G-1. Outline of the Product -Speed 1/2" Video Cassette Player G-2. VCR Format VHS Standard NTSC SECAM PAL-M PAL-N VHS Hi-Fi Audio System(for Hi-Fi) G-3. Color System NTSC SECAM or Monochrome G-4. NTSC Playback(PAL60Hz) G-5. MESECAM G-6. Cassette Tape VHS type video cassette tape Width 12.65mm (1/2 Inch) VHS-C type video cassette tape...
  • Page 5 GENERAL SPECIFICATIONS G-17.Audio Signal Input Level Microphone dB / Kohm Line dB / Kohm dB / Kohm Output Level Line dB / Kohm dB / Kohm(0dB=0.775 Vrms) S/N Ratio at SP Mode dB (Weighted) Harmonic Distortion : % (1KHz) Frequency Response : at SP Mode Hz ~...

  • Page 6: Contents

    GENERAL SPECIFICATIONS G-31.Terminals VHF/UHF Antenna Input/Output Din Type F-Type France Type Front Video Input (RCA ø8.3) Front Audio Input (RCA ø8.3) Rear Video Input (RCA ø8.3) Rear Audio Input (RCA ø8.3) Rear Video Output (RCA ø8.3) Rear Audio Output (RCA ø8.3) 21 Pin DC 12V Jack (Center+) Remote Jack (ø3.5).
  • Page 7 GENERAL SPECIFICATIONS G-37.Other Features Auto Head Cleaning Index Search Auto Tracking HQ (VHS Standard High Quality) Auto Power On, Auto Play, Auto Rewind, Auto Eject,Auto Power Off Forward / Reverse Picture Search SQPB CM Skip Rental Vertical Eject G-38.Switch Front Power Play/Still F.FWD/Cue...

  • Page 8: Removal Of Mechanical Parts And P. C. Boards

    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 AND FRONT CABINET Disconnect the following connectors: (CP4001, CP1004, (Refer to Fig. 1-1) CP1002, CP1006, CP1003 and CP4101).

  • Page 9: 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) Remove the 3 screws 1. Remove the Lock Lever Bracket, Lock Lever Rubber, Lock Lever and Lock Lever Spring.
  • Page 10 DISASSEMBLY INSTRUCTIONS 2-6: LINK ASS'Y (Refer to Fig. 2-6) Tension Adjust Set the Link Ass'y to the Eject position. Remove the (A) side of the Link Ass'y first, then remove Tension Band Ass'y the (B) side. Tension Spring Tension Arm Ass'y Tension Holder Link Ass'y SS Brake Spring...
  • Page 11 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 12 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 13 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 14 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 15 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 16 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 the ATR button on the Adjusting of the Tracking to the center position. remote control for more than Refer to the "MECHANICAL ADJUSTMENT"...

  • 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: 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 21: 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 22 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 23 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 24 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 25: 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 26 ELECTRICAL ADJUSTMENTS 2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE TP1002 TP1001 TP4001 VR1001 TP4201 TU4201 J502 J4201 SYSCON PCB D2-2...
  • Page 27 Y/C/AUDIO/HEAD AMP BLOCK DIAGRAM D4003 Q4004 CP4101 CH2 (L) CYL. 3 COM 4 CH1 (R) Y/C AUDIO IC IC4001 LA71026ML REC/ C.ROT MODE 16 17 QV/GH FM AGC HEAD AMP IC 1.3M IC4101 LA70001M W-LIM ACCD PB AMP DEMOD B.DEEN KILLER H.SW BURST...
  • Page 28 SYSTEM CONTROL/SERVO BLOCK DIAGRAM SYSCON/SERVO/CONTROLLER IC IC1002 OEC0086B SP-L/LP-M/EP-H 83 SP-L/LP-M/EP-H POWER/JACK POWER ON-H POWER ON-H SP TRICK PB-K SP TRICK PB-H P. CON + 5V D1014 REC/EE/PB 94 EE/PB ATR LED DUMMY_V.SYNC DUMMY V.SYNC D1004 H.SW 24 H.SW PB LED TRICK PB-H 85 LD/EP PB-H D1003...
  • Page 29 POWER/JACK BLOCK DIAGRAM TU4201 J502 Q4203 VV+5 SW F502 J4201 Q4202 BUFFER VIDEO_OUT Y/C/AUDIO/ HEAD AMP NORMAL_A_OUT D515 VV-L D514 SYSCON/SERVO R510 12V REGULATOR IC POWER_ON H IC503 BA12ST Q506 OVER VOL SW P. CON + 12V 6V REGULATOR IC IC502 NJM7806FD AT+5V Q507...
  • Page 30 PRINTED CIRCUIT BOARDS SYSCON (INSERTED PARTS) DECK SOLDER SIDE SOLDER SIDE CP101 S101 S105 S106 S104 S103 Q101 Q1004 S102 VR1001 W806 W836 W843 R4206 W095 W001 Q507 C4205 C4016 C4029 C1060 X4001 W821 L4101_1 C4025 D521 W040 W113 R4201 C4023 W101 W830...
  • Page 31 PRINTED CIRCUIT BOARDS SYSCON (CHIP MOUNTED PARTS) SOLDER SIDE C1008 Q1003 IC1002 Q1005 R1070 C1022 R1024 R1057 R1025 Q4004 Q4006 IC4101 C4108 Q4202 IC4001 Q4005 Q4003 R4006 C4017 R4008 R1097 R4015 R4004 Q506 R519 Q4203 R1006...
  • Page 32 Y/C/AUDIO SCHEMATIC DIAGRAM (SYSCON PCB) L4003_1 L4002 100uH 10uH 0305 BUFFER Q4005 2SC2412K Q4003 2SC2412K TO JACK NORMAL_A_OUT W801 VIDEO_OUT FROM/TO SYSCON/SERVO C4014 SP-L/LP-M/EP-H 0.022 B H.SW C4013 R4010 C.ROT CCD-GND DUMMY_V.SYNC QV/GH H.SYNC 1.8K C4047 EE/PB C4004 PLPF 320FH X4001 HALFH COMB...
  • Page 33 SYSCON CONTROL/SERVO SCHEMATIC DIAGRAM (SYSCON PCB) FROM/TO POWER POWER_ON-H AT+5V P.CON+5V P.CON+12V MOD_VCC (CYL) (S/S) (CAP) (LDM) LOADING MOTOR DRIVER IC IC1001 BA6955N R1089 R1094 CONTROL LOGIC FROM/TO Y/C/AUDIO POWER SP-L/LP-M/EP-H SAVE H.SW 11.6 11.6 H.SW R1090 R1095 DUMMY_V.SYNC TP1002 EE/PB 10K 1/4W 2.7K...
  • Page 34 POWER SCHEMATIC DIAGRAM (SYSCON PCB) HS501 763WAA0159 J502 HEC0824-010010 239003 F502 12V REGULATOR IC 3A250V W823 IC503 BA12ST FH503 FH504 EYF-52BC EYF-52BC 3A 250V 13.0 11.9 OVER VOL SW D506 Q506 DTC114EKA 1SS133 TO JACK AT+5V P.CON+5V P.CON+12V 6V REGULATOR IC IC502 NJM7806FD TO Y/C/AUDIO P.CON+5V...
  • Page 35 JACK SCHEMATIC DIAGRAM (SYSCON PCB) MONO REAR JACK J4201 JPJ1611-010430 TU4201 MDF33-VA343A W843 FROM Y/C/AUDIO VIDEO OUT TP4201 NORMAL_A_OUT VIDEO_OUT C4201 R4201 22P CH 1K 1/4W NORMAL_A_OUT FROM/TO HEAD AMP R4203 390 1/2W BUFFER Q4202 2SA1037AK R4219 VV+5V SW. C4205 Q4203 FROM POWER 2SA1037AK...
  • Page 36 HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) C4110 PLL 5V PB OFF REC ON PB ON AGC-DET REC OFF BIAS CURRENT REC/MUTE/PB SW30 EP/SP SW 30 H.SYNC MUTE H CH HIGH ENVELOPE L CH FROM/TO JACK FROM/TO SYSCON/SERVO H.SW W827 ENV.DET FROM POWER P.CON+5V TO Y/C/AUDIO...
  • Page 37 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: THE DC VOLTAGE AT EACH PART WAS NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME CRITICAL FOR SAFETY,USE ONES DANGEREUSES AN POINT DE VUE SECURITE...
  • Page 38 INTERCONNECTION DIAGRAM DC 12V HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR DC IN DC JACK J502 J4201 VIDEO OUT HALL HALL SWITCH LOGIC AUDIO OUT CP1004 MOTOR_GND I_LIMIT VCO(12V) CAP/M/F/R VCC(5V) CAPSTAN DD UNIT DECK MECHA ASS’Y M2001 CD4001 HEAD AUDIO CONTROL ASS’Y CP4001 H5001...

  • Page 39: Waveforms

    WAVEFORMS Y/C/AUDIO 100mV 10µs/div 200mV 0.5ms/div SYSCON/SERVO 0.5V 5ms/div 1V 2ms/div 100mV 5µs/div 20mV 0.5ms/div 0.5V 10µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 40: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB010 (SYSCON PCB ASS'Y)
  • Page 41 CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5001 D1100 M101 PCB550 (DECK PCB ASS'Y) Applying positions AA, AB, AC, AD and BA for NOTE: 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 42 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 Check if the correct grease or oil is applied for G-555G each position.

  • Page 43: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A4C615A720 CABINET,FRONT ASS'Y 701WPJB506 CABINET,FRONT 711WPD0575 PLATE,FRONT 712WPJB260 FLAP 743WKA0032 SPRING,FLAP(COMBO) 735WPDA514 BUTTON,DECK 735WPAA160 BUTTON,BASE 713WPAA028 GLASS,LED 713WPAA029 GLASS,POWER LED 800WFA0041 CUSHION,LEG 702WSB0018 CABINET,TOP 702WSA0066 PLATE,BOTTOM 722A08A097 SHEET,RATING 753WSA0116 SHIELD,COVER HEAD AMP 753WUAA005 SPRING,EARTH HEAD AMP 704WPAA006 HOLDER,DECK(R) 701WPAA148 HOLDER,LED...

  • Page 44: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION A4C615A420K DECK ASSY A4C615A420K 8107126A04 SCREW,TAP TITE(S) PAN 2.6x10 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 85OA500025 AHC ASS'Y (VRT) 8107226604 SCREW,TAP TITE(S) BIND 2.6x6 85OP200290 BELT,CAPSTAN (S) 8109126604 SCREW,TAP TITE(B) PAN 2.6x6...

  • Page 45: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS MISCELLANEOUS ! R510 R3K28A4R7J R,METAL 4.7 OHM 2W CP4101 0697240600 CONNECTOR PCB SIDE TOC-C04X-B1 ! R1007 R3X1811R2J R,METAL OXIDE 1.2 OHM 1W ! F502 080PC03005 FUSE 239003CC CAPACITOR...
  • Page 46 M4C6-15A SPEC.NO. K1X4013 O/R NO.

Table of Contents