Memorex MVP0028 Service Manual Download

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SERVICE MANUAL

Design and specifications are subject to change without notice.

VIDEO CASSETTE PLAYER

MVP0028

ORIGINAL

MFR’ VERSION A

Summary of Contents for MVP0028

Page 1: ...SERVICE MANUAL Design and specifications are subject to change without notice VIDEO CASSETTE PLAYER MVP0028 ORIGINAL MFR VERSION A ...

Page 2: ...replaced should be used the part which has the same character Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark the designated parts must be used 1 KEEP THE NOTICES 3 PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING There are parts which use the insulation material such as a tube or tape for safety or wh...

Page 3: ...DJUSTMENTS BLOCK DIAGRAMS Y C AUDIO HEAD AMP SYSTEM CONTROL SERVO POWER JACK PRINTED CIRCUIT BOARDS SYSCON DECK SYSCON SCHEMATIC DIAGRAMS Y C AUDIO SYSTEM CONTROL SERVO POWER JACK HEAD AMP DECK INTERCONNECTION DIAGRAM WAVEFORMS MECHANICAL EXPLODED VIEW CHASSIS EXPLODED VIEWS MECHANICAL REPLACEMENT PARTS LIST CHASSIS REPLACEMENT PARTS LIST ELECTRICAL REPLACEMENT PARTS LIST A1 1 A1 1 A2 1 A3 1 A3 4 ...

Page 4: ...te at LP Mode Max 420 min with T 210 cassette at SLP Mode Max 630 min with T 210 cassette PAL or SECAM at SP Mode Max 300 min with E 300 cassette at LP Mode Max 600 min with E 300 cassette G 9 Rewind Fast Forward Time Approx 2 30 FF 2 30 REW with T 120 cassette with E 180 cassette G 10 Search Speed SP 3 and 5 Times LP 5 and 7 Times SLP 7 and 9 Times G 11 Slow Speed SP Times LP Times SLP Times G 12...

Page 5: ...Source V AC 50Hz AC 60Hz 12V DC G 21 Power Consumption 9 8 W at DC 12V Per Year kWh Year G 22 Dimensions Approx 255 mm W 315 mm D 95 mm H G 23 Weight Approx Net 3 0 6 6 lbs Gross 4 0 8 8 lbs G 24 Cabinet Material Cabinet Front PS 94HB DECABROM ABS 94V2 NON DECA 94V0 G 25 Cassette Loading System Front Cassette Loading System G 26 Tape Counter Linear Time Tape Counter Yes No G 27 Protector Power Fus...

Page 6: ...ster Carton Need No Need Content Set Material Corrugated Carton Dimensions mm L mm W mm D Description of Origin Yes No Gift Box Material Single Brown Corrugated Carton with Photo Label Single White Corrugated Carton with Photo Label Single Full Color Carton W Photo Dimensions 373 mm L 326 mm W 176 5 mm D Design As Per Buyer s Description of Origin Yes No Drop Test Natural Dropping At 1 Corner 3 Ed...

Page 7: ...Selector 1 or 2CH 3 or 4CH G 39 Remote Control Unit None RC Power Source D C V Battery UM 0 Ch Up Tr Up Power 1 Ch Down Tr Down Eject 2 Ch Skip Play 3 Cancel CH Skip Play Up 4 Enter Play Slow Up 5 Speed F FWD 6 Index F FWD Right 7 Program Rew 8 Program Video Plus Rew Left 9 Video Plus Pause Still 10 Set Up Still 11 Set Down Stop 12 Set Right Stop Down Set Left REC OTR Auto Tracking Call Clock Coun...

Page 8: ...ex in direction of arrow A at the same time slide in direction of arrow B Then lift in direction of arrow C A C B Flap Fig 1 2 1 3 DECK CHASSIS Refer to Fig 1 3 Remove the 3 screws 1 Remove the screw 2 Disconnect the following connectors CP4001 CP1004 CP1002 CP1006 CP1003 and CP4101 Remove the Deck Chassis in the direction of arrow 1 2 3 4 1 1 1 2 Fig 1 3 Deck Chassis Bottom Plate 1 4 SYSCON PCB R...

Page 9: ...ASSETTE SIDE L R Refer to Fig 2 5 Unlock the 4 supports 1 and then remove the Cassette Side L R 1 B2 1 NOTE When you install the Cassette Side R be sure to move the Locker R after installing Cassette Side L Cassette Side R 1 1 1 Locker R 1 Fig 2 5 NOTE Fig 2 2 2 3 TAPE GUIDE L Refer to Fig 2 3 A Move the Cassette Holder Ass y to the back side Unlock the 2 supports 1 and remove the Tape Guide L Rem...

Page 10: ... to Fig 2 8 A Move the Inclined S Ass y to the back side Remove the Tension Spring Unlock the support 1 and remove the Tension Arm Ass y Remove the Tension Adjust Unlock the 2 supports 2 and remove the Tension Band Ass y Unlock the support 3 and remove the Tension Holder Remove the SS Brake Spring Remove the SS Arm Brake 1 2 3 4 5 6 7 8 3 1 2 2 Tension Adjust Tension Band Ass y Tension Spring Tens...

Page 11: ... Spring Remove the screw 1 Unlock the 2 supports 2 and remove the Cassette Opener Remove the Pinch Roller Block Pinch Roller Arm Spring Pinch Roller Lever Ass y and P5 3 Arm Ass y 1 2 3 4 1 2 2 P5 Spring Cassette Opener P5 3 Arm Ass y Pinch Roller Block Pinch Roller Lever Ass y Main Chassis Fig 2 11 A Pinch Roller Arm Spring Screw Torque 5 0 5kgf cm B2 3 Fig 2 11 B A C Head 2 2 A C Head Spring 1 3...

Page 12: ...stan DD Unit 1 2 3 Screw Torque 5 0 5kgf cm Fig 2 15 2 16 MIDDLE GEAR MAIN CAM Refer to Fig 2 16 A Remove the Polyslider Washer 1 then remove the Middle Gear Remove the E Ring then remove the Main Cam P5 Cam and Pinch Roller Cam Remove the Polyslider Washer 2 then remove the Joint Gear 1 2 3 Capstan DD Unit Capstan Belt 1 1 1 Fig 2 17 1 Clutch Ass y Ring Spring Coupling Gear Clutch Lever 2 2 B2 4 ...

Page 13: ...ve the Loading Gear Spring 2 When you install the Clutch Actuator install as shown in the circle of Fig 2 18 C Refer to Fig 2 18 C Fig 2 18 C Clutch Actuator NOTE Do not touch the roller of Guide Roller B2 5 Screw Torque 5 0 2kgf cm Screw 2 Screw Torque 0 7 0 2kgf cm Screw 4 Fig 2 19 Loading Gear Holder Inclined T P4 Cover Guide Roller Inclined S 1 2 3 4 4 Guide Roller 2 19 INCLINED S T ASS Y Refe...

Page 14: ...using a blower type IC desoldering machine Refer to Fig 3 2 2 Fig 3 2 NOTE Do not add the rotating and the back and forth directions force on the IC until IC can move back and forth easily after desoldering the IC leads completely When IC starts moving back and forth easily after desoldering completely pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering...

Page 15: ...3 8 Thin tip Soldering Iron NOTE When the IC leads are bent during soldering and or repairing do not repair the bending of leads If the bending of leads are repaired the pattern may be damaged So be always sure to replace the IC in this case Finally confirm the soldering status on four sides of the IC using a magnifying glass Confirm that no abnormality is found on the soldering position and insta...

Page 16: ...lop Frequency Generator Front Loading Switch Frequency Modulation Frequency Sub Carrier Forward Generator Ground High Pass Filter I K L M N O P R S H SW Hz IC IF IND INV KIL L LED LIMIT AMP LM LDM LP L P F LUMI M MAX MINI MIX MM MOD MPX MS SW NC NR OSC OPE PB PB CTL PB C PB Y PCB P CON PD PG P P R REC REC C REC Y REEL BRK REEL S REF REG REW REV RVS RF RMC RY S CLK S COM S DATA SEG SEL SENS SER SI ...

Page 17: ...tor Separation Transistor Tracking Trick Playback Test Point Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse Voltage Display Video Playback Variable Resistor Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source Vertical Synchronization Voltage Tuning Crystal Luminance Chrominance C1 2 ...

Page 18: ... Tracking to the center position Refer to the MECHANICAL ADJUSTMENT GUIDE ROLLER and ELECTRICAL ADJUSTMENT PG SHIFTER Press the ATR button on the remote control for more than 2 seconds during PLAY Make the short circuit between the test point of SERVICE and the GND The EOT BOT Reel sensor do not work at this moment Refer to the PREPARATION FOR SERVICING ...

Page 19: ... Replace when rolling becomes abnormal Clean the Head CLEANING NOTE After cleaning the heads with isopropyl alcohol do not run a tape until the heads dry completely If the heads are not completely dry and alcohol gets on the tape damage may occur 1 AUDIO CONTROL HEAD Clean the Audio Control Head with the cotton stick soaked by alcohol Clean the full erase head in the same manner Refer to the figur...

Page 20: ...ape For 2 heads model VHS Alignment Tape For 2 heads model VHS Alignment Tape For 2 heads model VHS Alignment Tape For 4 heads model VHS Alignment Tape For 4 heads model VHS Alignment Tape For 4 heads model VHS Alignment Tape For 4 heads model Adapter Dial Torque Gauge 10 90gf cm Dial Torque Gauge 60 600gf cm Post Adjustment Screwdriver X Value Adjustment Screwdriver Master Plane Reel Disk Height ...

Page 21: ...Adjustment Jig JG024A A Cut Position Fig 1 2 B B Tension Adjust 1 3 CONFIRMATION OF PLAYBACK TORQUE AND BACK TENSION TORQUE DURING PLAYBACK Load a video tape T 120 recorded in standard speed mode Set the unit to the PLAY mode Install the tentelometer as shown in Fig 1 3 Confirm that the meter indicates 20 2gf in the beginning of playback 1 2 USING A CASSETTE TYPE TORQUE TAPE JG100A 1 2 3 After con...

Page 22: ...djusted precisely at the factory Adjustment is not necessary as usual When you replace the parts of the tape running mechanism because of long term usage or failure the confirmation and adjustment are necessary 2 1 GUIDE ROLLER Playback the VHS Alignment Tape JG001 or JG001B Refer to SERVICING FIXTURE AND TOOLS Connect CH 1 of the oscilloscope to TP4001 Envelope and CH 2 to TP1002 SW Pulse Press a...

Page 23: ...the Guide Roller Refer to item 2 1 Confirm and adjust the Audio Control Head Refer to item 2 2 Connect CH 1 of the oscilloscope to TP4001 CH 2 to TP1002 and CH 3 to HOT side of Audio Out Jack Playback the VHS Alignment Tape JG001S or JG001T Refer to SERVICING FIXTURE AND TOOLS Press and hold the Tracking Auto button on the remote control more than 2 seconds to set tracking to center Set the X Valu...

Page 24: ...3 MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 5 6 7 8 9 10 1 2 3 4 1 Tension Adjust 2 Tension Arm 3 Guide Roller 4 P1 Post 5 Audio Control Head 6 7 8 9 10 X value adjustment driver hole P4 Post T Brake Spring T Reel S Reel D1 4 ...

Page 25: ...P1002 and CH 2 to TP4201 Playback the alignment tape JG001A Press and hold the Tracking Auto button on the remote control more than 2 seconds to set tracking to center Adjust the VR1001 until the waveform of the oscilloscope measures 6 5 0 5 H at both leading and trailing edges Refer to Fig 1 1 A B 6 5H CH 1 CH 2 CH 1 CH 2 6 5H Read and perform this adjustment when repairing the circuits or replac...

Page 26: ...ELECTRICAL ADJUSTMENTS D2 2 2 ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE SYSCON PCB J502 J4201 TP4201 TU4201 VR1001 TP1001 TP1002 TP4001 ...

Page 27: ... BPF SUB CONV LP EP PB H CTL CTL VIDEO_OUT NOAMAL_A_OUT SYSCON SERVO POWER JACK 40 13 17 16 19 41 ACCD AMP BURST EMPH MAIN CONK EQ AMP LINE AMP MUTE ALC NC A GND 1H CCD VXD AMP QV GH FBC PB AMP B DEEN KILLER 3 58M BPF COMB YNR CLAMP NC2 NL LPF CLAMP FM AGC W LIM DEMOD SUB LPF MAIN DEEMPH PB EQ MOD REC EQ 53 Q4003 AMP Q4005 BUFFER Q4006 BUFFER Q4004 SW D4003 A MUTE H HEAD AUDIO CONTROL CP4001 1 2 3...

Page 28: ... 39 DFG 38 CYL A MUTE H 59 ENV DET H SW H SW 24 EE PB REC EE PB 94 LD EP PB H 27 TRICK PB H 85 DUMMY_V SYNC ENV DET 14 EP L 20 VV H VV H 58 CTL H 32 A MUTE H 31 RESET 16 DEW 4 3 1 2 IC1003 PST993D AT 5V CP1002 2 DEW DEW CTL CTL LDM FWD H 64 LDM RVS H 63 P CON 12V LDM LDM CP1006 4 3 SYSTEM RESET IC 2 4 7 1 8 5 CAP PWM 25 STOP EJECT PLAY STILL KEY A 9 POWER REW REV CFG 40 I LIMIT CTL FG 3 4 6 5 CP10...

Page 29: ...12V REGULATOR IC IC503 BA12ST 2 4 1 6V REGULATOR IC IC502 NJM7806FD 1 3 OVER VOL SW Q506 POWER_ON H 3 1 J502 2 POWER JACK BLOCK DIAGRAM 2 J4201 4 BUFFER Q4202 VIDEO_OUT NORMAL_A_OUT Y C AUDIO HEAD AMP SYSCON SERVO E 5 E 6 P CON 12V 2 TU4201 3 4 VV 5 SW Q4203 VV L ...

Page 30: ...502 C522 R526 Q507 D516 D515 HS501 C518 W115 W112 C4208 R4205 TP4201 C P 1 0 0 3 W114 D521 CP4001 J4201 W104 CP1002 R510 W840 W091 W062 W078 R1083 R1085 W052 C4012 W074 W022 W033 W045 W094 C1010 D506 W025 W829 W037 Q1004 W825 W846 W027 W828 W105 TP1001 W101 X1002 W001 R1007 L4002 W096 D518 D1011 R1015 R1102 W053 R1029 R1054 W006 W005 W029 W801 X4001 W102 C4204 W064 TP4001 Q 1 0 1 0 Q1009 W036 R108...

Page 31: ...7 Q4004 C4052 R4034 C4054 R4012 R4014 R4016 R4019 C4027 C4018 C4034 R4003 R4018 R4017 C4040 R4004 C4038 C4058 C4004 C4002 C4036 C4039 C4042 C4059 C4056 R1004 R1024 C1008 C1020 R1067 R1062 R1068 C1038_1 C1048 R1077 R1061 R1066 C1056 C1057 C4005 C4022 C4019 C4045 C4120 C4108 C4122 R1095 R4032 R4006 Q1005 R4007 R4008 R4009 R4025 C4043 R1002 R1097 R1057 R519 R1006 R1025 R1070 R1017 R1065 R1076 C4201 R...

Page 32: ...4017 12K R4020 4 7K R4018 8 2K R4016 330K R4015 12K R4044 1K R4032 1M R4004 1 8K R4019 220 R4007 1K R4008 150K R4006 820 R4009 1 5K AUDIO SIGNAL PB PLAYBACK COLOR SIGNAL PLAYBACK LUMINANCE SIGNAL NORMAL_A_OUT VIDEO_OUT GND H SW SYNC AUDIO_MUTE H DUMMY_V SYNC SP_TRICK_PB H SP L LP M EP H H SW DUMMY_V SYNC EE PB VV H LP EP_PB H AUDIO_MUTE H SYNC LP EP_PB H SP_TRICK_PB H CTL CTL GND EE PB VV H GND P ...

Page 33: ...22K R1015 22K 1 4W R1017 22K R109810K R1004 47K R1096 6 8K R1089 10K R1094 10K R1006 2 2K R1002 82K R1086 1K 1 4W R1085 1K 1 4W R1072 10K 1 4W R1005 120 1 4W R1008 47K R1014 47K R1102 2 2K 1 4W R1070 5 6K R1057 560 R1048 27K 1 4W R1081 10K 1 4W R1084 1 5K R1087 1 8K R1091 2 7K R1093 3 9K R1025 150K R1024 560K R1022 10K R1029 33K 1 4W R1032 1M R1016 10K 1 4W PLAYBACK COLOR SIGNAL PLAYBACK LUMINANCE...

Page 34: ... ARE SINCE THESE PARTS MARKED BY CAUTION D516 MTZJ18B IC502 NJM7806FD 6V REGULATOR IC 1 2 3 R510 4 7 2W X D521 1N4005E D518 1N4005E D514 21DQ09N D515 1N4005E D506 1SS133 W808 W823 W834 Q507 2SD734 P CON 5V SW DURING PLAYBACK MEASURED WITH THE DIGITAL TESTER NOTE THE DC VOLTAGE AT EACH PART WAS OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME C5...

Page 35: ...MEASURED WITH THE DIGITAL TESTER NOTE THE DC VOLTAGE AT EACH PART WAS OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME C4205 22 16V KA C4204 470 10V YK C4208 0 01 F C4201 22P CH R4213 100 1 4W R4201 1K 1 4W R4205 75 1 4W R4219 10K R4206 100 1 4W R4203 390 1 2W AUDIO SIGNAL PB PLAYBACK COLOR SIGNAL PLAYBACK LUMINANCE SIGNAL NORMAL_A_OUT VIDEO_OU...

Page 36: ...108 0 1 F C4120 22P CH C4122 22P CH R4041 12K R4087 27K 1 4W AUDIO SIGNAL PB PLAYBACK COLOR SIGNAL PLAYBACK LUMINANCE SIGNAL GND H SW ENV DET GND P CON 5V GND PB Y C GND NC G 10 G 9 PCB010 VM9172 TO Y C AUDIO FROM POWER FROM TO SYSCON SERVO FROM TO JACK PB MUTE REC REC REC MUTE PB AGC DET H SYNC PLL 5V SW30 L H PB ON REC OFF 10K DET ENVELOPE BIAS 1K CURRENT PB REC PB OFF REC ON AMP VCC AGC ATT 1 0...

Page 37: ...IBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION CP101 52044 0445 1 2 3 4 Q101 RPT 38PB113 BOT SENSOR DURING PLAYBACK MEASURED WITH THE DIGITAL TESTER NOTE THE DC VOLTAGE AT EACH PART WAS OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME FROM TO SYSCON SERVO G 12 G 11 LOADING MOTOR M101 VE8851 PCB550 D...

Page 38: ..._FG CYL_ B CYL_PG CYL_VCC_5V CYL_DRIVE CYL_GND CYL_FG CYL_ B CYL_PG CYL_VCC_5V CAP M F R I_LIMIT MOTOR_GND G 14 G 13 INTERCONNECTION DIAGRAM CP1002 DEW SENSOR DEW DEW G O VCC MR FG SENSOR ROTOR MAGNET COIL MAIN HALL SENSOR LOGIC SWITCH OUT IN HALL VCC HALL CD4001 FFC AUDIO PB CTL CTL AUDIO GND CP4001 CP1004 H5001 HEAD AUDIO CONTROL ASS Y AUDIO CONTROL AUDIO PB CTL CTL AUDIO GND M2001 DECK MECHA AS...

Page 39: ... 100mV 5µs div 4 PB 20mV 0 5ms div 5 PB 0 5V 10µs div WAVEFORMS The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram NOTE Y C AUDIO H 1 6 PB 200mV 0 5ms div 7 PB 1V 2ms div SYSCON SERVO ...

Page 40: ...ECHANICAL EXPLODED VIEW I 1 611 707 707 707 707 705 705 705 706 615 618 616 704 612 702 613 703 601 602 603 604 609 608 607 606 605 610 610 701 701 617 616 614 709 708 708 PCB010 SYSCON PCB ASS Y 619 620 ...

Page 41: ...8M AB MG 33 AD FL 721 AC FL OIL No 6115 BA OIL 515 360 321 348 507 H5001 506 305 304 301 347 316 313 508 315 338 512 310 359 368 357 366 306 366 358 365 351 363 323 324 362 320 335 319 349 318 336 328 512 314 508 313 511 509 329 330 502 502 PCB550 DECK PCB ASS Y AD AD AD AD AA AD AD AA AA AB AB AD AD BA AA 352 502 367 501 356 317 370 309 355 300 505 334 AA UN4001 M2003 510 M101 364 D1100 503 371 5...

Page 42: ...AA AA AD AD AA AA AA AA AA AC AA 307 354 326 327 322 513 350 308 337 AA 325 AD AA AD NOTE Applying positions AA AB AC AD and BA for the grease or oil are displayed for this section Check if the correct grease or oil is applied for each position PART NO CLASS MARK GREASE G 555G AA G 488M AB FL 721 AC FL OIL No 6115 BA OIL MG 33 AD 300 ...

Page 43: ...H HEAD AMP 616 704WPAA006 HOLDER DECK R 617 701WPAA148 HOLDER LED 618 752WSA0209 SHIELD CASE HEAD AMP 619 800WF00034 CUSHION 13x13xT6 620 85OP700036 HOLDER EOT SENSOR 701 8110226A04 SCREW TAP TITE P BIND 2 6x10 702 8110630604 SCREW TAP TITE P BRAZIER 3x6 703 8107630504 SCREW TAP TITE S BRAZIER 3x5 704 8151230704 SCREW TAP TITE S R BIND 3x7 705 8107140B94 SCREW TAP TITE S PAN 4x29 706 8146240644 SC...

Page 44: ...5 M2003 1589311005 MICRO MOTOR F2OEL82 320 85OA400178 PINCH ROLLER LEVER ASS Y PCB550 A4C831B550 DECK PCB ASS Y VE8851 321 85OA600196 BRAKE T ASSY S Q101 0000700320 TRANSISTOR PHOTO RPT 38PB113 322 85OA600191 CAP BRAKE ASS Y S UN4001 A4C608A500 CYLINDER UNIT ASSY A4C608A500 323 85OA900213 LINK ASS Y 324 85OA900216 LINK LEVER ASS Y 325 85OP200284 LEVER CLUTCH S 326 85OP200285 ACTUATOR CLUTCH 327 85...

Page 45: ...IC LA70001M TRM TRANSISTORS Q506 TNYJB05001 COMPOUND TRANSISTOR DTC114EKAT146 Q507 TD3T007340 TRANSISTOR SILICON 2SD734 E F AA Q1001 0002G00540 PHOTO COUPLER GP1S566 or 0002M00570 PHOTO COUPLER SG 260 Q1002 0002G00540 PHOTO COUPLER GP1S566 or 0002M00570 PHOTO COUPLER SG 260 Q1003 T8YJ2412K0 TRANSISTOR SILICON 2SC2412KT146 R S Q1004 0000100380 PHOTO TRANSISTOR PNA2604M010R Q1005 TNYJC05001 COMPOUND...

Page 46: ...M4C6 15A K1X4013 SPEC NO O R NO ...

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