Service manual

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SERVICE MANUAL

Design and specifications are subject to change without notice.

MVR2040A

VIDEO CASSETTE RECORDER

ORIGINAL

MFR’S VERSION A

Summary of content (47 pages)

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MVR2040A SERVICE MANUAL VIDEO CASSETTE RECORDER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.
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SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual. 2. USE THE DESIGNATED PARTS The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character.
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CONTENTS SERVICING NOTICES ON CHECKING ..................................................................................... HOW TO ORDER PARTS ........................................................................................................... CONTENTS ................................................................................................................................. GENERAL SPECIFICATIONS .................................................................................................
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GENERAL SPECIFICATIONS G-1. Outline of the Product 3 -Speed 1/2" Video Cassette Recorder G-2. VCR Format VHS Standard NTSC PAL SECAM PAL-M PAL-N VHS Hi-Fi Audio System G-3. Video Recording System : Rotary,slant azimuth two head helical scan system Luminance Component : FM recording Chrominance Component: Low frequency converted direct recording G-4. Broadcasting System US System M G-5. Color System NTSC PAL G-6. NTSC Playback(PAL60Hz) Yes No SECAM or Monochrome G-7. MESECAM Yes No G-8.
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GENERAL SPECIFICATIONS G-17.Tuner and Receiving Channel Tuner: Contactless Electric Tuner Oscar(W/O HYPER) Oscar(W/ HYPER) Channel coverage 2 ~ 69 , 4A , A-5 ~ A-1 , A ~ I , J ~ W , Tuning System Frequency syn. Voltage syn. G-18.Preset Channel No Allocation G-19.Intermediate Frequency Picture(FP) Sound (FS) FP-FS -- channels ch ~ ch ~ ch ~ 45.75 41.25 4.50 G-20.RF Converter Output Channel Level/Impedance Sound Selector G-21.
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GENERAL SPECIFICATIONS G-26.Power Source 120 V AC 50Hz G-27.Power Consumption: Stand by: Per Year: AC 60Hz 11 2.5 -- W at AC 120 W at AC 120 kWh / Year V V 60 60 Hz(Approx.) Hz(Approx.) G-28.Dimensions(Approx.) 360 mm(W) 240 G-29.Weight(Approx.) mm(D) Net Gross G-30.Cabinet Material Cabinet Front: : : 95 3.2 4.6 mm(H) Kg ( Kg ( PS ABS 7.1 lbs) 10.2 lbs) 94HB 94V2 94V0 DECABROM NON-DECA G-31.Cassette Loading System: Front Cassette Loading System G-32.
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GENERAL SPECIFICATIONS G-41.Display Fluorescent Indicator Yes No Clock/Counter,Channel,Timer Rec,OTR,Play,Rec,FF(Cue),Rew(Rev), Still,Pause,ATR,Eject,Stop WKL,Y.M.D,Start,End AFT Repeat VCR Memory Index VPS PDC SP LP SLP AM PM On Screen Display Menu Clock Set( Calendar 12H 24H) Timer Rec Set Auto Repeat On Off Sap On Off CH Set TV/CATV Auto CH Memory Add/Delete Language No Noise Back Ground G-CODE(or SHOWVIEW or PLUSCODE)No.
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GENERAL SPECIFICATIONS G-45.Accessories Owner's Manual ( W/Guarantee Card) [English/Spanish] Remote Control Unit Dew Caution Sheet Video Cassette Tape Battery (UM- 4 x 2 ) Safety Tip Toll Free Insert Sheet Guarantee Card Audio-Video Cord (RCA) Warning Sheet Quick Set-Up Sheet Information Sheet U/V Mixer 75 ohm Coaxial Cable ( Single Shield Double Shield) 300 ohm to 75 ohm VHF Antenna Adaptor Registration Card Car Cord Tape Rewinder(Buyer Supply) G-45.
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GENERAL SPECIFICATIONS G-47.Remote Control Unit :RC-DC Glow in Dark Remocon Yes No Power Source : D.C 3 V Battery UM - 4 x 2 Control Key :Total 42 Key 0 1 2 3 4 5 6 7 8 9 Menu Set Up Set Down Enter Cancel Call Ch Up Ch Down Input Select Audio Select TV/VCR Pause/Still Slow Slow Speed Up Slow Speed Down Skip Search Speed TV Monitor Index Program Video Plus Program/Video Plus A3- 6 Power Eject Play Stop F.
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DISASSEMBLY INSTRUCTIONS 1-3: DECK CHASSIS (Refer to Fig. 1-3) 1. REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS 1. Remove the 3 screws 1. 2. Remove the screw 2. 3. Disconnect the following connectors: (CP1001, CP1002, CP1003, CP4001, CP4002 and CP4003). 4. Remove the Deck Chassis in the direction of arrow. 1-1: TOP CABINET, FRONT CABINET AND OPERATION PCB (Refer to Fig. 1-1) 1. Remove the 4 screws 1. 2. Remove the Top Cabinet in the direction of arrow (A). 3. Disconnect the following connector: (CP651). 4.
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DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DECK PARTS NOTE 2-1: TOP BRACKET (Refer to Fig. 2-1) When you install the Tape Guide L, install as shown in the circle of Fig. 2-3-B. (Refer to Fig. 2-3-B) 1. Remove the 2 screws 1. 2. Slide the 2 supports 2 and remove the Top Bracket. NOTE Tape Guide L When you install the Top Bracket, install the screw (1) first, then install the screw (2). REC Lever (2) (1) 1 1 Top Bracket Top Bracket • The REC Lever is not installed on the Video Cassette Player. Fig.
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DISASSEMBLY INSTRUCTIONS 2-6: LINK ASS'Y (Refer to Fig. 2-6) 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) 1. Set the Link Ass'y to the Eject position. 2. Remove the (A) side of the Link Ass'y first, then remove the (B) side. 1. Move the Inclined S Ass'y to the back side. 2. Remove the Tension Spring. 3. Unlock the support 1 and remove the Tension Arm Ass'y. 4. Remove the Tension Adjust. 5. Unlock the 2 supports 2 and remove the Tension Band Ass'y. 6. Unlock the support 3 and remove the Tension Holder. 7.
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DISASSEMBLY INSTRUCTIONS 2-11: S REEL/T REEL (Refer to Fig. 2-11) NOTE 1. Remove the S Reel and T Reel. 2. Remove the 2 Polyslider Washers 1. 1. Do not touch the Pinch Roller. (Use gloves.) 2. When you install the Pinch Roller Block, install as shown in the circle of Fig. 2-12-B. (Refer to Fig. 2-12-B) NOTE 1. Take care not to damage the gears of the S Reel and T Reel. 2. The Polyslider Washer may be remained on the back of the reel. 3. Take care not to damage the shaft. 4.
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DISASSEMBLY INSTRUCTIONS 2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) 1 Middle Gear 1. Unlock the support 1 and remove the AHC Ass'y. 2. Remove the 3 screws 2. 3. Remove the Cylinder Unit Ass'y. E-Ring 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 toward the left front direction. 2 Joint Gear P5 Cam AHC Ass'y Fig.
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DISASSEMBLY INSTRUCTIONS 2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 2. When you install the Clutch Actuator, install as shown in the circle of Fig. 2-19-C. (Refer to Fig. 2-19-C) 1. Remove the E-Ring 1 and remove the Main Loading Gear. 2. Remove the Capstan Brake Spring. 3. Slide the Main Rod and remove the Capstan Brake Ass'y. 4. Remove the Main Rod, Tension Lever, Clutch Actuator, Idler Arm Ass'y. 5. Remove the screw 2. 6. Remove the LED Reflecter. 7.
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KEY TO ABBREVIATIONS A A/C ACC AE AFC AFT AFT DET AGC AMP ANT A.PB APC ASS'Y AT AUTO A/V B BGP BOT BPF BRAKE SOL BUFF B/W C C CASE CAP CARR CH CLK CLOCK (SY-SE) COMB CONV CPM CTL CYL CYL-M CYL SENS D DATA (SY-CE) dB DC DD Unit DEMOD DET DEV E E EF EMPH ENC ENV EOT EQ EXT F F FBC FE FF FG FL SW FM FSC FWD G GEN GND H H.P.
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KEY TO ABBREVIATIONS S SYNC SYNC SEP T TR TRAC TRICK PB TP U UNREG V V VCO VIF VP V.PB VR V.
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SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. Method Press both PLAY button and CH UP button on the set for more than 2 seconds. While pressing the CH UP key on the set, press the FF key on the set for more than 2 seconds. 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. Operations Initialization of the factory.
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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 Parts Name 500 hours 1,000 hours 1,500 hours 2,000 hours 3,000 hours Notes Audio Control Head Clean those parts in contact with the tape.
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PREVENTIVE CHECKS AND SERVICE INTERVALS CLEANING NOTE 2. TAPE RUNNING SYSTEM 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. When cleaning the tape transport system, use the gauze moistened with isopropyl alcohol. 3. CYLINDER Wrap a piece of chamois around your finger. Dip it in isopropyl alcohol. Hold it to the cylinder head softly.
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NOTE FOR THE REPLACING OF MEMORY IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.
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SERVICING FIXTURES AND TOOLS (For 2 heads model) VHS Alignment Tape JG001 (VN 2 S-LI6 3 ) JG001A (VN 2 S-CO13 ) JG001Q (VN 2 S-LI6 3 H) JG001T (VN 2 S-X6 3 ) (For 4 heads model) VHS Alignment Tape JG001B (VN 1 S-LI6 3 ) JG001I (VN 1 S-CO13 ) JG001P (VN 1 S-LI6 3 H) JG001S (VN 1 S-X6 3 ) JG002B Adapter JG002E Dial Torque Gauge (10~90gf•cm) JG002F (60~600gf•cm) JG005 Post Adjustment Screwdriver Part No.
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MECHANICAL ADJUSTMENTS 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION 1. CONFIRMATION AND ADJUSTMENT Read the following NOTES before starting work. 1. Set to the PLAY mode. 2. Adjust the Tension Adjust until the edge of the Tension Arm is positioning within 0.5mm range from the standard line center of Main Chassis. After this adjustment, confirm that the cut position is located in "A" area as shown in Fig. 1-2-B. If it is located in "B" area, adjust again. 3.
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MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE 1. Operate within 4~5 seconds after the reel disk begins to turn. 2. Install the Torque Gauge (JG002F) and Adapter (JG002B) on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4) 3. Then, confirm that it indicates 120~180gf•cm. 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM NOTE Tape Running Mechanism is adjusted precisely at the factory. Adjustment is not necessary as usual.
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MECHANICAL ADJUSTMENTS 2-2: CONFIRMATION AND ADJUSTMENT OF AUDIO/ CONTROL HEAD 2-3: TAPE RUNNING ADJUSTMENT (X VALUE ADJUSTMENT) When the Tape Running Mechanism does not work well, adjust the following items. 1. Confirm and adjust the height of the Reel Disk. (Refer to item 1-1) 2. Confirm and adjust the position of the Tension Post. (Refer to item 1-2) 3. Adjust the Guide Roller. (Refer to item 2-1) 4. Confirm and adjust the Audio/Control Head. (Refer to item 2-2) 5.
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MECHANICAL ADJUSTMENTS 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 5 6 4 3 7 2 1 8 9 10 1. Tension Adjust 2. Tension Arm 3. Guide Roller 4. P1 Post 5. Audio/Control Head 6. X value adjustment driver hole 7. P4 Post 8. T Brake Spring 9. T Reel 10.
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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 Input Signal-Alignment Tape (JG001B) INSTRUCTIONS 1. Connect CH-1on the oscilloscope to TP1002 and CH-2 to TP4201. 2. Playback the alignment tape. (JG001B) 3.
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ELECTRICAL ADJUSTMENTS 2.
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Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM Q4007 BUFFER Q4008 X4001 3.579545MHz BUFFER Q4009 Y/C/AUDIO/CCD/ HEAD AMP IC IC4001 LA71077BM-MPB BUFFER 62 51 61 49 53 47 4FSC PULL VX01 TIMMING L 85 H.SW REC FM-EQ H 84 AGC AMP 83 CP4001 1 H H.AMP SW L 82 EP/LP_CH2 (L) 2 EP/LP_COM 88 P CYL SP-CH2 (L) 5 SP_COM H TRICK_PB-H/EE-H 19 DOC_XO_CTL DETAL ENH CLAMP P P R R Main CONV B-UP AMP H.SW 9 VCA YNR/ COMB 3.58M BPF2 P ACC AMP P CLAMP N.L. DEEM 3.58M BPF1 R KIL B.D.
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SYSTEM CONTROL/SERVO/DECK BLOCK DIAGRAM TIMER SYSCON SERVO CONTROLLER IC IC1001 OEC0089A 80 POWER ON H POWER_ON-H POWER 89 POWER FAIL-H POWER_FAIL X1001 10MHz C.SYNC C.SYNC 54 P_OFF-L 55 4FSC 73 OSC 2 4 FSC OUT 52 72 OSC 1 SP/LP/EP-H 83 SP/LP/EP-H 1 REC/EE/PB 27 DUMMY_V.SYNC REC/EE/PB DUMMY V.SYNC H.SW 24 OPERATION KEY-B 8 KEY-B KEY-A 9 KEY-A REM_IN DECK BLK 82 REM IN CP1003 1 VCC 2 BOT P.
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TUNER BLOCK DIAGRAM REAR OUT JACK J4201 3 2 MONO FRONT JACK J4203 2 4 Q4201 SYSCON/ SERVO/DECK VIDEO_OUT BUFFER RF-SW SW6001 AT_13T TU6001 2 FRONT_A_IN-L FRONT_V_IN FSC Y/C/AUDIO/CCD/ HEAD AMP TUNER_V 15 2 TUNER_A FROM_NORMAL_A 3 5 TV/VCR 6 11 IIC_CLK 12 IIC_DATA SYSCON/ SERVO/DECK 16 21 23 AFT-S.
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OPERATION BLOCK DIAGRAM V651 7-MT_201GA 14 11 10 4 23 22 21 1 17 2 25 26 HEATER_DC- 9 6 17 11 31 30 5 HEATER_DC+ 1 CP601 CH-UP KEY-A 4 4 KEY-A KEY-B 3 3 KEY-B FL_CS CH-DOWN FIP DRIVER IC IC 651 BU2977FS 23 24 26 FL_SD_OUT POWER STOP/EJECT POWER CP651 SYSCON/ SERVO/DECK FL_S_CLK OS651 REC/OTR FF/CUE 1 REM_IN 3 AT+5V PLAY REW/REV POWER BLOCK DIAGRAM T501 6 HEATER_DC- 7 HEATER_DC+ OPERATION +32V 13 5 10 2 9 12 4 AT+12.6V 11 P.
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PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) DECK SOLDER SIDE SOLDER SIDE L504 T501 D510 Q503 R513 R511 R514 Q511 R505 D528 D505 D506 C1001 R527 L501 1 CP W019 D1004 W827 2 00 W018 W017 FH501 1.
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F-3 R662 C654 R604 R1011 IC1001 1 R1027 81 R601 R1012 Q1007 C6013 R1006 C515 C1036 C6002 R4046 R1004 R4028 R4031 R6009 C6014 R4026 R4019 R4043 R4045 C6001 C4018 R4003 R4002 C4009 VEX905A R6005 R6006 C4202 R4206 R4202 R4008 R4013 R4012 R4022 R4020 C4025 C4027 C4020 R4032 R4025 R4034 R4023 C4003 R4001 R4011 C4074 R4010 C4005 C4006 R4072 C6009 R4210 R4029 81 R603 51 R1026 R4051 R4048 C4049 C4041 IC4001 R1005 R4059 R4053 R4044 C4032 C4029 C4028 C4048 C4055 R4050
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A B C D E F G H Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) INPUT_SEL 8 SP/LP/EP-H P.CON+5V TUNER_A FRONT_A_IN-L 8 P.CON+5V C4070 6.3V 47 KA R4031 6.8K 4.7K R4019 FROM POWER 7 47K 47K R4026 R4028 L4002 100uH 0305 L4008 7 0 A B C C4045 6.3V 47 KA B 50V 1 KA 0.01 B 1K F 1.9 0 1.6 5.0 1.0 0.2 2.0 3.4 2.8 2.6 1.9 0 BUFFER Q4009 2SA1015Y FROM/TO SYSCON/SERVO 46 2.5 220K C4058 45 44 43 2.8 C4060 220K 1/4W 42 41 2.8 TRICK_PB-H/EE-H 39 3.
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A B C D E F G H SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM POWER_FAIL-AC VIDEO_OUT TV/VCR AFT-S.CURVE R1008 IIC_CLK FROM/TO POWER IIC_DATA (SYSCON PCB) POWER_FAIL 8 FROM/TO TUNER 8 10K MODEVCC POWER_ON-H 33K 1/4W R1010 AT+5V[M-CON] P.CON+5V 1SS133 82P CH 10K C1019 LOADING MOTOR DRIVER IC IC1002 BA6955AN D1008 F/R 4FSC R1051 LDM.F LDM.R V.REC_ST-H (LDM) CYL_DRIVE (CAP) CAP_LIMIT GND (S/S) SENS_LED GND POWER_ON-H GND C.SYNC 7 AT+5V AT+12.
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A B C D E F G H TUNER SCHEMATIC DIAGRAM 8 8 (SYSCON PCB) RF-SW SW6001 SSAB110100 CH4 CH3 4 3 TU6001 TMDH2-A05A REAR OUT JACK J4201_1 JPJ9911-010430 1 H1 H2 4 VIDEO OUT TP4201 L6001 P.CON+5V V W811 R4202 R4209 TV/VCR CONTROL 5 R6004 2 E H 3 4 A FROM/TO Y/C/AUDIO/CCD/HEAD AMP C4212 FRONT_V_IN 75 16V 10 KA FRONT_A_IN-L 6 6.3V 470 YK 1K 1/4W 6 C4201 C6001 22P CH 8 NC NC 9 NC RF AGC H V NC 100uH 0305 V.IN 3 75 3 MB A 1 MTZJ6.8B 2 RF_CONV_A.
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A B C D E F G H POWER SCHEMATIC DIAGRAM 8 8 (SYSCON PCB) TO TUNER 7 7 (TUNER) GND R529 +32V 330 1/4W D524 C518 C522 L504 P.CON+5V R501 330 1/4W 10V 470 YK C520 C503 D517 MTZJ27D C514 1SS244 R508 21DQ04N (S/S) (CAP) (LDM) 1SS133 D502 C506 P.CON+5V SW Q501 2SB926 R507 R509 1K 390 AT+5V GND -30V 3 HEATER_DC+ 3.3K PHOTO COUPLER Q511 TLP621(D4-GR-LF2) P.ON SW Q504 DTC143EKA +-1% R518 0.0082 B VOLTAGE CTL IC KIA431 IC501 TO OPERATION 0 4.3K C515 0.03 +-1% 0.
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A B C D E F G H OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) 8 V651 8 7-MT-201GA 6G 7G 5G 4G 1G 2G 3G OTR VCR ATR APM SLPM 25 26 7 FROM POWER 1G 2G 3G 4G 5G 7G 6G NC NC P11 P9 P10 P8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 8 P7 7 P6 6 P5 5 P4 4 P3 2 P1 1 P2 7 HEATER_DCR662 HEATER_DC+ MTZJ5.1C D651 47K R661 C654 0.01 B 1G 2G 3G 4G 5G 6G 7G P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 2.
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A B C D E F G H DECK SCHEMATIC DIAGRAM 8 8 LOADING MOTOR M101 7 7 S105 5.
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A B C D E F G H INTERCONNECTION DIAGRAM G 1 O 2 GND CP651 GND GND KEY-B KEY-A FE HEAD (HOT) GND 7 1 MOTOR_GND 2 3 I LIMIT 3 4 CTL 4 5 VCO(12V) 5 6 FG 6 7 CAP/M/F/R 7 8 VCC(5V) 8 CAPSTAN DD UNIT ASS’Y M2001 1 2 3 4 6 CP4002 BLACK HEAD AUDIO CONTROL ASS’Y H5001 CD1002 FFC 6 AUDIO PB 6 AUDIO PB 5 AUDIO REC 5 AUDIO REC 4 CTL+ 4 CTL+ CTL- 3 3 5 OUT SWITCH LOGIC MR FG SENSOR 1 2 CP4003 2 2 2 1 1 WHITE CP1002 1 FE HEAD (HOT) BLADE WIDE
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WAVEFORMS Y/C/AUDIO/CCD/HEAD AMP SYSCON/SERVO 1 PB 1V 0.2ms/div 6 PB 2V 5ms/div 11 POWER ON 1V 50ns/div 2 POWER ON 100mV 0.1µs/div 7 PB 1V 0.2ms/div 12 PB 1V 0.2s/div 3 PB 200mV 1ms/div 8 PB 1V 0.5ms/div 13 PB 1V 0.2s/div 4 PB 200mV 0.5ms/div 9 PB 0.5V 10ms/div 14 POWER ON 1V 5ms/div POWER 5 REC 20V 5µs/div 10 POWER ON 0.5V 50ns/div 15 PB 50V 2µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
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MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO.
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CHASSIS REPLACEMENT PARTS LIST REF. NO. 300 PART NO.
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ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO.
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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................
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SPEC.NO. M4C8-A1B O/R NO.