Toshiba w425 Service Manual
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Toshiba w425 Service Manual

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FILE NO. 140-200123
SERVICE MANUAL
VIDEO CASSETTE RECORDER
W425

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Summary of Contents for Toshiba w425

  • Page 1 FILE NO. 140-200123 SERVICE MANUAL VIDEO CASSETTE RECORDER W425...

  • 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~A3-5 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 On Screen Menu Display Menu Type Character Timer Rec Set Auto Repeat On/Off SAP On Off CH Set-Up TV/CATV Auto CH Memory Add/Delete Pin Code Registration System Set-Up Clock Set Yes (Calendar 12H) Language No Noise Back Ground G-CODE(or SHOWVIEW or PLUSCODE)No.
  • Page 6 GENERAL SPECIFICATIONS G-12 Remote Unit RC-EA Control Glow in Dark Remocon Power Source Voltage(D.C) UM size x pcs UM-4 x 2 pcs Total Keys 32 Keys Keys Power CH Up CH Down Input Select Play F.Fwd Pause/Still Stop Rec/OTR Eject Counter Reset Speed Timer Rec...
  • Page 7 GENERAL SPECIFICATIONS G-14 Accessories Owner's Manual Language English w/Guarantee Card Remote Control Unit Dew Cation Sheet Video Cassette Tape Battery UM size x pcs UM 4 x 2 pcs Security Tag Toll Free Insert Sheet Quick Set-Up Sheet Information Sheet (Buyer Supply) 75 Ohm Coaxial Cable Yes(Single shield) Rod Antenna...
  • Page 8 GENERAL SPECIFICATIONS G-18 Carton Master Carton Content Material Dimensions W x D x H(mm) Description of Origin Gift Box Material Single/Full Color Dimensions W x D x H(mm) 420x291x160 Design As Per BUYER 's Description of Origin Drop Test Natural Dropping At 1Corner / 3Edges / 6Surfaces Height (cm) Container Stuffing(40' container)

  • Page 9: 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 10: 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 11 DISASSEMBLY INSTRUCTIONS 2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A) Tension Arm Ass'y Remove the screw 1. Remove the Loading Motor. Remove the Worm. Fig. 2-7-A Loading Motor Worm Tension Connect Tension Band Main Chassis Tension Spring Tension Arm Ass'y Tension Holder •...
  • Page 12 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 13 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 14 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 3 screws 1. Remove the E-Ring 1, then remove the Main Cam. Remove the E-Ring 2, then remove the Pinch Roller Remove the Capstan DD Unit.
  • Page 15 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. Unlock the support 1 and remove the Cassette Guide (Refer to Fig.

  • Page 16: 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 17 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 18: 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 19 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 20: 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 21: 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 22: Servicing Fixtures And Tools

    SERVICING FIXTURES AND TOOLS Alignment Tape Back tension cassette gauge Torque cassette gauge Taper nut driver (KT-300NR) ST-N5 ST-NF 70909103 70909199 70909228 VTR cleaning kit VTR lubrication kit Grease JG002B Adapter JG002E Dial Torque Gauge (10~90gf•cm) JG002F (60~600gf•cm) JG022 Master Plane JG024A Reel Disk Height JG153 X Value Adjustment JG154 Cable...

  • Page 23: 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 24 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 25 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 26 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 27: 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 you exchange IC and Transistor for a heat sink, apply the silicon grease on the contact section of the heat sink.
  • Page 28 ELECTRICAL ADJUSTMENTS 2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE TP1001 J4205 J4203 VR1001 T501 TU6001 TP4001 TP1002 TP4201 J4202 J4201 SYSCON PCB D3-2...
  • Page 29 Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM AUDIO SIGNAL(REC) AUDIO SIGNAL (PB) X4001 PLAYBACK COLOR SIGNAL 100CT3R508 PLAYBACK LUMINANCE SIGNAL RECORD COLOR SIGNAL RECORD LUMINANCE SIGNAL Q4012 Q4010 TUNER VIDEO SIGNAL BUFFER Y/C/AUDIO/CCD/HEAD AMP IC BUFFER IC4001 LA71205M-MPB PULL Y/C_CS VX01 SERIAL SYSCON/SERVO IIC_DATA TIMMING DRIVER...

  • Page 30: Y/C/Audio/Ccd/Head Amp

    SYSTEM CONTROL/SERVO BLOCK DIAGRAM TIMER SYSCON SERVO CONTROLLER IC IC1001 OEC0117A 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 Y/C_CS Y/C_CS MS_SEN A Q1004 Q1005 DUMMY V.SYNC DUMMY_V.SYNC V.REC ST-H V.REC_ST-H...

  • Page 31: Tuner Block Diagram

    TUNER BLOCK DIAGRAM FRONT AV JACK REAR OUT JACK VIDEO REAR IN JACK AUDIO L J4201 J4203 J4202 J4205 Q4201 VIDEO_OUT BUFFER SYSCON/SERVO REAR_V_IN RF_CH_SW REAR_A_IN TUNER_V P. CON + 12V FRONT_V_IN Y/C/AUIO/CCD HEAD AMP FRONT_A_IN-L FROM NORMAL A TU6001 TUNER_A TV/VCR IIC_CLK...

  • Page 32: Power Block Diagram

    OPERATION BLOCK DIAGRAM CH UP CP651 CP601 KEY-A KEY-A CH DOWN KEY-B KEY-B STOP/EJECT OS651 REM_IN REC/OTR TV/VCR LED SYSCON/TSERVO D664 FF/CUE 1G/TV/VCR_LED T_REC LED PLAY D665 2G/T_REC_LED REC LED REW/REV D666 3G/REC_LED POWER POWER BLOCK DIAGRAM IC501 KIA431 VOLTAGE CTL IC Q506 P.

  • Page 33: Printed Circuit Boards Syscon/Operation

    PRINTED CIRCUIT BOARDS SYSCON/OPERATION (INSERTED PARTS) SOLDER SIDE D666 OS651 D664 D665 D663 C520 J4203 J4205_1 C514 CP651 W113 R1043 W036 D514 Q506 X1001_1 Q515 Q508 C502 D512 R604 SW606_5 W029 D520 D521 W033 SW605_5 D501 W034 W150 D525 SW603_5 W091 SW607_5 W010...
  • Page 34 PRINTED CIRCUIT BOARDS SYSCON/OPERATION (CHIP MOUTED PARTS) SOLDER SIDE R4006 R6006 R4214 C4020 R4016 C4028 Q4003 C4015 R4021 C4032 C4019 R4039 C4038 R4210 C4061 C4060 Q4012 Q4010 C4054 R516 R4036 R4034 Q4011 R4044 R4046 Q1007 R1017 R1045 R1044 C1054 R1015 R607 IC1003 R1083...
  • Page 35 Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) R4041 BUFFER Q4012 1.8K 2SC2412K FROM POWER FROM/TO TUNER P.CON+5V REAR_A_IN C4058 FRONT_V_IN 6.3V C4059 FRONT_A_IN-L 0.1 F TUNER_V R4038 C4061 TUNER_A 680K 0.01 FROM_NORMAL_A BUFFER Q4011 REAR_V_IN 2SC2412K 4FSC C4016_1 BUFFER COMP OUT CLOCK ALWAYS 4Fsc...
  • Page 36 SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM FROM/TO POWER POWER_FAIL (SYSCON PCB) LED_VCC POWER_ON-H AT+5V[M-CON] P.CON+5V AT+5.2V AT+12.6_V (S/S) (MOTOR) (LED) C1001 W869 FROM/TO Y/C/AUDIO/CCD/HEAD AMP FROM/TO DECK 4FSC L1002_1 R1029 W868 CP1001 IIC_CLK X1001_1 TMC-J12P-B2 1002T01003 L1001 22uH IIC_DATA CAP_FG CAP_FG R1033 15uH Y/C_CS CAP_VCO...
  • Page 37 POWER SCHEMATIC DIAGRAM (SYSCON PCB) TO TUNER (TUNER) R549 +32V 330 1/4W W837 +12V AT+12.6_V AT+5.2V D521 1SS244 P.CON+5V L501 TO Y/C/AUDIO/CCD/HEAD AMP D505 0R3A433F20 AC120V_60Hz P.CON+5V CD501 1N4005-EIC 0R414901 D508 S502 WHITE 1N4005-EIC D523 FROM/TO SYSCON/SERVO S501 BLACK 1N4005-EIC C504 POWER_ON-H 275V...
  • Page 38 OPERATION SCHEMATIC DIAGRAM (SYSCON PCB) PCB270 VEA977 REW/REV SW607_5 SKQNAED010 PLAY SW606_5 SKQNAED010 FF/CUE SW605_5 SKQNAED010 FROM/TO SYSCON/SERVO 1G/TV/VCR_LED 2G/T-REC_LED 3G/REC_LED REC/OTR SW604_5 REM_IN KEY-B SKQNAED010 KEY-A R658 1G/TV/VCR_LED POWER CP651 CP601 SW608_5 560 1/4W B2013H02-3P A2001WV2-3P R659 CD651 2G/T-REC_LED KEY-A KEY-A CU230701...
  • Page 39 TUNER SCHEMATIC DIAGRAM (SYSCON PCB) REAR OUT JACK REAR IN JACK J4201_1 J4202_1 TU6001 MSP-382V-18_PBSN MSP-382V-18_PBSN TCMN0682PA13D(4) R6006 RF_CONV_A.OUT A.IN H1 H2 H1 H2 RF_CH_SW VIDEO OUT W844 TP4201 W811 REAR_A_IN C4210 TV/VCR CONTROL REAR_V_IN R6004 V.IN 1/4W W803 FROM_NORMAL_A W816 RF_CONV_A.OUT RF AGC...
  • Page 40 INTERCONNECTION DIAGRAM HALL MAIN ROTOR FULL ERASE HEAD ASS’Y SENSOR COIL MAGNET H5002 FG SENSOR LOADING MOTOR M101 OPERATION PCB HALL HALL PCB270 SWITCH LOGIC VEA977 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 41: Y/C/Audio/Ccd/Head Amp

    WAVEFORMS Y/C/AUDIO/CCD/HEAD AMP SYSCON/SERVO POWER ON POWER ON POWER ON 10µs 500mV/div 5ms 1.0V/div 50ns 1.0V/div FF/REW POWER ON 2µs 1.0V/div 5ms 2V/div 100ns 100mV/div POWER OFF POWER ON 5ms 2V/div 1ms 100mV/div 500µs 1.0V/div POWER FF/REW 500µs 200mV/div 500µs 500mV/div 2µs 50V/div POWER ON 5µs 20V/div...

  • Page 42: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW TU6001 PCB010 (SYSCON PCB) PCB270 (OPERATION PCB) I1-1...

  • Page 43: Chassis Exploded Views

    CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5002 H5001 M101 NOTE: Applying positions AA for the grease are CLASS MARK displayed for this section. GREASE Check if the correct grease is applied for each position. I2-1...
  • Page 44 CHASSIS EXPLODED VIEW (BOTTOM VIEW) CD1501 M2001 CD1502 NOTE: Applying positions AA for the grease are CLASS MARK displayed for this section. GREASE Check if the correct grease is applied for each position. I2-2...

  • Page 45: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description BZ610292 A4F117B720 CABINET,FRONT ASSY BZ710567 701WPJB544 CABINET,FRONT BZ710568 711WPDA443 PLATE,DISPLAY BZ710569 712WPJB293 FLAP BZ710570 713WPAA056 GLASS,LED BZ710571 735WPJA537 BUTTON,PLAY BZ710572 735WPJA538 BUTTON,STOP/EJECT BZ710331 753WUAA006 SPRING,EARTH H/AMP BZ710010 743WKA0032 SPRING,FLAP BZ710573 800WFA0045 CUSHION,LEG...

  • Page 46: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description BZ610293 A4F117B420K DECK ASSY A4F117B420K BZ710564 85OA400234 PINCH ROLLER BLOCK BZ710514 85OP900746 BRACKET,TOP 3V BZ710193 85OP200290 BELT,CAPSTAN (S) BZ710515 85OP600581 WORM BZ710094 85OP500083 BASE,AC HEAD BZ710112 85OP800324 SPRING,AC HEAD BZ710516 85OA000459 MAIN CHASSIS ASS'Y...
  • Page 47 CHASSIS REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description BZ710049 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 BZ710390 8107226504 SCREW,TAP TITE(S) BIND 2.6x5 BZ710371 8107226404 SCREW,TAP TITE(S) BIND 2.6x4 BZ710046 8102120604 SCREW,PAN M2x6 BZ710050 8109126604 SCREW,TAP TITE(B) PAN 2.6x6 BZ710553 810A130404 SCREW/WASHER(A) M3x4...

  • Page 48: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R502 BZ210219 R0G3K2335K 3.3M OHM 1/2W ! R512 BZ210038 R002T2333J 33K OHM 1/2W ! R514 BZ210039 R3X181010J R,METAL OXIDE OHM 1W ! R547 BZ210220 R002T2224J 220K OHM 1/2W ! R549 BZ210221 R65584331J...
  • Page 49 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description COILS &TRANSFORMERS L6002 BZ310039 02167F220J COIL ! T501 BZ310163 0481220094 TRANSFORMER,SWITCHING 8122009 T4001 BZ310114 031626009R COIL,BIAS OSC 1626009 JACKS J4201 BZ614344 060J401078 RCA JACK MSP-382V-18_PBSN J4202 BZ614344 060J401078 RCA JACK MSP-382V-18_PBSN J4203 BZ614345...
  • Page 50 TOSHIBA VIDEO PRODUCTS PTE. LTD. 438B ALEXANDRA ROAD, BLOCK B #06-01 ALEXANDRA TECHNOPARK SINGAPORE 119968...

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