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Hitachi VT-FX685A Service Manual Download Page 65

3-3-1

SYMBOL-NO

   P-NO

      DESCRIPTION

  RESISTOR

VR501

TJ13934

CARBON FILM

  SEMI-CONDUCTORS

D001

TC10752

DIODE 1A5

D002

TC10752

DIODE 1A5

D003

TC10752

DIODE 1A5

D004

TC10752

DIODE 1A5

D006

TC10112

DIODE 1N4148M

D013

TC10791

RECTIFIER DIODE BA157

D014

TJ15128

DIODE FR202

D015

TJ15128

DIODE FR202

D016

TC10877

DIODE SB140

D018

TC10604

ZENER DIODE UZ-9.1BSC

D026

TC10607

ZENER DIODE UZ-33BSD

D027

TC10112

DIODE 1N4148M

D028

TC10112

DIODE 1N4148M

D029

TC10112

DIODE 1N4148M

D031

TJ13895

ZENER DIODE MTZJT-775.6B

D051

TE13211

DIODE BA158

D052

TJ13919

ZENER DIODE NTZJT-771.B

D054

TJ15129

DIODE RL151

D055

TC10112

DIODE 1N4148M

D057

TJ13896

ZENER DIODE MTZJT-775.1C

D060

TC10752

DIODE 1A5

D301

TC10112

DIODE 1N4148M

D302

TC10112

DIODE 1N4148M

D303

TC10112

DIODE 1N4148M

D501

TC10112

DIODE 1N4148M

D502

TC10112

DIODE 1N4148M

D555

TJ13898

LED

D701

TC10607

ZENER DIODE UZ-33BSD

!

IC001

TE13224

IC LTV-817B-F

IC301

TJ15132

IC LA71091M

IC451

TJ15133

IC LA72653M

IC501

TJ15279

IC M37765MAA1L5GP

IC505

TJ15281

IC BR24C01AF-W

IC506

TJ15135

IC BD6655FP

!

Q001

TJ13922

TRANSISTOR 2SK2599

Q002

TE13243

TRANSISTOR KTC3199(BL)

Q029

TE13243

TRANSISTOR KTC3199(BL)

Q031

TC10778

TRANSISTOR KTC3199

Q052

TJ13923

TRANSISTOR BN1F4M

Q055

TJ13924

TRANSISTOR 2SC536NF

SYMBOL-NO

   P-NO

      DESCRIPTION

Q056

TJ15283

TRANSISTOR 2SC2001

Q060

TJ13923

TRANSISTOR KRA103M

Q061

TJ15315

TRANSISTOR 2SB892S

Q062

TJ13923

TRANSISTOR KRA103M

Q301

TC10784

TRANSISTOR KTA1266

Q302

TC10783

TRANSISTOR KTC3193

Q303

TC10783

TRANSISTOR KTC3193

Q391

TC10784

TRANSISTOR KTA1266

Q421

TC10784

TRANSISTOR KTA1266

Q422

TE13235

TRANSISTOR KTC3203Y

Q423

TJ13924

TRANSISTOR 2SC536NF

Q424

TJ13924

TRANSISTOR 2SC536NF

Q425

TJ13923

TRANSISTOR KRA103M

Q501

TE13243

TRANSISTOR KTC3199(BL)

Q503

TJ13925

TRANSISTOR ST-304L-A

Q504

TJ13925

TRANSISTOR ST-304L-A

Q506

TJ15141

TRANSISTOR PT204-6B-12

Q645

TC10783

TRANSISTOR KTC3193

Q646

TC10783

TRANSISTOR KTC3193

Q647

TC10783

TRANSISTOR KTC3193

Q648

TC10783

TRANSISTOR KTC3193

  TRANSFORMER

!

T001

TJ15285

TRANSFORMER

  COILS

!

L001

TJ15243

FILTER, LINE

L006

TJ13909

COIL 47UH

L009

TJ13909

COIL 47UH

L301

TA12561

COIL 100UH

L303

TJ15137

INDUCTOR 220UH

L304

TJ13909

COIL

L421

TJ13915

COIL

L422

5121289

COIL 22UH

L501

TA12561

COIL 100UH

L502

TA12561

COIL 100UH

L581

TJ13909

COIL

L701A

TJ13909

COIL 47UH

L851

TJ15138

INDUCTOR 1.8UH

L852

TA12562

COIL 12UH

  CRYSTALS

X301

TJ15145

CRYSTAL

ELECTRICAL PARTS LIST

Note: Although some parts in the schematic diagrams have different names from those in the parts list, there is no
problem in replacing parts.

Summary of Contents for VT-FX685A

Page 1: ...tment Instructions 1 7 1 Block Diagrams 1 8 1 Function Indicator Symbols 1 8 11 SchematicDiagrams CBA s and Test Points 1 9 1 Waveforms 1 9 8 Wiring Diagram 1 10 1 System Control Timing Charts 1 11 1 IC Pin Function 1 12 1 Lead Identifications 1 13 1 DECK MECHANISM SECTION Standard Maintenance 2 1 1 Fixture and Tape for Adjustment 2 2 1 Mechanical Alignment Procedures 2 3 1 Disassembly Assembly Pr...

Page 2: ...ctrical Adjustment Instructions 1 7 1 Block Diagrams 1 8 1 Function Indicator Symbols 1 8 11 Schematic Diagrams CBA s and Test Points 1 9 1 Waveforms 1 9 8 Wiring Diagram 1 10 1 System Control Timing Charts 1 11 1 IC Pin Function 1 12 1 Lead Identifications 1 13 1 MAIN SECTION VIDEO CASSETTE RECORDER VT FX685A VT FX685AC MAIN SECTION Specifications Preparation for Servicing Adjustment Procedures S...

Page 3: ... R P dBV 10 6 2 SP Mode 3 3 S N R P dB 38 43 SP Mode 3 4 Distortion R P 2 4 0 SP Mode 3 5 Freq response R P at 200Hz dB 6 0 SP Mode 20dB ref 1kHz at 8kHz dB 6 1 5 SP Mode 4 Tuner 4 1 Video Output Vp p 0 8 1 0 1 2 E E Mode 4 2 Video S N S N Y signal dB 40 47 E E Mode 4 3 Audio Output 1kHz dBV 10 6 4 E E Mode 4 4 Audio S N 1kHz dB 40 46 E E Mode Note Nominal specs represent the design specs All unit...

Page 4: ...ly 1 Wires covered with PVC tubing 2 Double insulated wires 3 High voltage leads D Use specified insulating materials for hazardous live parts Note especially 1 Insulation tape 2 PVC tubing 3 Spacers 4 Insulators for transistors E When replacing AC primary side components transformers power cord etc wrap ends of wires securely about the terminals before soldering F Observe that the wires do not co...

Page 5: ... current be tween B earth ground power cord plug prongs and externally exposed accessible parts RF terminals an tenna terminals video and audio input and output ter minals microphone jacks earphone jacks etc is lower than or equal to the specified value in the table below Measuring Method Power ON Insert load Z between B earth ground power cord plug prongs and exposed accessible parts Use an AC vo...

Page 6: ...t pack IC with tweezers while apply ing the hot air 3 Bottom of the flat pack IC is fixed with glue to the CBA when removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Release the flat pack IC from the CBA using tweez ers Fig S 1 6 Caution 1 Do not supply hot air to the chip parts around the flat pack IC for ...

Page 7: ...the flat pack IC you can remove it easily Fig S 1 3 2 Affix the wire to a workbench or solid mounting point as shown in Fig S 1 5 3 While heating the pins using a fine tip soldering iron or hot air blower pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig S 1 5 4 Bottom of the flat pack IC is fixed with glue to the CBA when removing entire fla...

Page 8: ... a potential difference caused by electro static charge during unpacking or repair work 1 Ground for Human Body Be sure to wear a grounding band 1MΩ that is properly grounded to remove any static electricity that may be charged on the body 2 Ground for Workbench Be sure to place a conductive sheet or copper plate with proper grounding 1MΩ on the workbench or other surface where the semiconductors ...

Page 9: ...ion of Tape Start Sensor Tape End Sensor and Reel Sensors If these TPs are connected before plugging in the unit the function of the sensors will stay valid See Fig 1 Note Because the Tape End Sensors are inactive do not run a tape all the way to the start or the end of the tape to avoid tape damage About REC Safety Switch Caution The REC Safety Switch is directly mounted on the Main CBA When the ...

Page 10: ...nnel numbers during channel preset only on the remote control 6 POWER button Press to turn VCR on and off Press to activate timer recording 7 Remote sensor window Receives the infrared signals from the remote control 8 Digital display A PWR Power indicator Indicates that the power is turned on B Cassette indicator Indicates that there is a tape in the VCR C VCR indicator Indicates that the VCR is ...

Page 11: ...ng recording or to view a still picture during playback only on the remote control Frame Advance function Press to advance the picture by one frame at a time during the still mode only on the remote control 19 SLOW button Press to start slow motion playback only on the remote control 20 MUTE button Press to mute the TV s sound Press it again to resume the sound only on the remote control 21 VOL um...

Page 12: ...k As sembly disconnects five Connectors CN251 CN501 CN502 CN503 CN504 Fig 3 2 Before installing the Deck Assembly be sure to place the pin of LD SW on Main CBA as shown in Fig 5 Then install the Deck Assembly while align ing the hole of Cam Gear with the pin of LD SW the shaft of Cam Gear with the hole of LD SW as shown in Fig 5 3 After removing the Main CBA desolder from bottom of the Main CBA as...

Page 13: ...embly S 2 CN501 CN504 CN251 CN502 CN503 Spacer Fig 3 L 4 L 4 L 3 6 Main C B A 7 Function C B A Desolder from bottom Fig 4 L 2 L 1 2 Front Assembly L 2 Fig 2 6 Main C B A SW507 LD SW LD SW Pin Pin Hole Hole Shaft Cam Gear 6 Main C B A 4 Deck Assembly Fig 5 1 6 2 ...

Page 14: ... 1 probe V Range 0 001 50V Div F Range DC AC 20MHz 2 Alignment Tape MH 1 Head Switching Position Adjust ment Purpose To determine the Head Switching point during play back Symptom of Misadjustment May cause Head Switching noise or vertical jitter in the picture Test Point Adj Point Mode Input TP751 V OUT TP302 RF SW TP511 GND VR501 Switching Point MAIN CBA PLAY SP Tape Measurement Equipment Spec M...

Page 15: ...ystem Control Block Diagram BLOCK DIAGRAMS END S T REEL T REEL ST S ST S Q504 Q503 Q501 RESET Q506 SW POINT AL 5V VR501 TIMER 5V TP506 TP505 D PB H TRICK C G APC SP LP SLP 45 SP LP SLP BLUEBACK ON 66 BLUEBACK ON P ON L 60 P ON L P DOWN L 63 P DOWN L H A SW 16 H A SW H A COMP 14 H A COMP D PB H D REC H SW506 REC SW FROM TO VIDEO BLOCK TO AUDIO BLOCK TO Hi Fi AUDIO BLOCK 3 1 KEY 2 KEY SWITCH TP511 G...

Page 16: ...CESS IC301 IC501 Y C PROCESS 35 REC VIDEO SIGNAL PB VIDEO SIGNAL MODE SP REC 13 88 89 90 91 42 30 31 31 30 40 CHARA MIX 6dB AMP ENV DET AGC AMP HPF FROM TO SERVO SYSTEM CONTROL BLOCK FROM TO SERVO SYSTEM CONTROL BLOCK CYLINDER ASSEMBLY R L RF SW RF SW 93 V ENV H A SW H A COMP H A COMP TP302 WF2 VIDEO L 2 HEAD VIDEO R 2 HEAD TP301 C PB BUFFER D V SYNC C SYNC BLUEBACK ON BLUEBACK ON BLUEBACK SP LP S...

Page 17: ...E H 5 AE H FE H A PB REC 4 A COM 3 AE H 1 AE H 2 CN287 AUDIO HEAD AUDIO ERASE HEAD AC HEAD ASSEMBLY FE HEAD DECK ASSEMBLY 1 FE H 2 FE H GND CN501 1 8 5 1 8 6 MAIN CBA PB AUDIO SIGNAL REC AUDIO SIGNAL Mode SP REC 16 11 12 D REC H D REC H REC EE PB A MUTE H D PB H FROM SERVO SYSTEM CONTROL BLOCK FULL ERASE HEAD WF8 2 SIF A IN L A IN R A IN L F A IN R F A OUT R N A OUT MOD A N A IN JK751 JK752 JK754 ...

Page 18: ...30 23 4 80 2 78 37 38 39 54 77 1 40 26 24 27 SIF A IN R A IN L N A OUT A IN R F A IN L F TO AUDIO BLOCK AGC AGC DET 49 MUTE A OUT L MOD A A OUT R N A IN Hi Fi H SW A MUTE H NORMAL H 51 ST SAP MODE TO AUDIO BLOCK Hi Fi DATA Hi Fi CLK Hi Fi CS P ON 9V TO SERVO SYSTEM CONTROL BLOCK TO SERVO SYSTEM CONTROL BLOCK TO SERVO SYSTEM CONTROL BLOCK Hi Fi AUDIO R HEAD Hi Fi AUDIO L HEAD CYLINDER ASSEMBLY MAIN...

Page 19: ...ROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SAME TYPE FUSE ATTENTION POUR UNE PROTECTION CONTINUE LES RISQES D INCELE N UTILISER QUE DES FUSIBLE DE MEMO TYPE RISK OF FIRE REPLACE FUSE AS MARKED This symbol means fast operating fuse Ce symbole reprèsente un fusible à fusion rapide A V A V 1 8 9 1 8 10 AC001 F001 1A 250V CHOKE COIL L001 D001 D004 BRIDGE RECTIFIER Q001 Q002 1 2 3 4 IC001 ERRO...

Page 20: ...ned parts and check them The circuit which turns on switching FET Q001 may be regarded as a possible cause even if the load at the secondary side is shorted it can t be detected because switching FET Q001 isn t operating Perform check according to the step 1 and 2 of repair method 1 and check the following parts Remove the part from PCB Switching FET Q001 source resistor R014 gate resistor R008 an...

Page 21: ...nsistors are represented by the fol lowing symbols Note 1 Do not use the part number shown on these draw ings for ordering The correct part number is shown in the parts list and may be slightly different or amended since these drawings were prepared 2 All voltages are DC voltages unless otherwise speci fied Values in schematic diagrams The values dielectric strength power capacitance and tolerance...

Page 22: ...lity of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Wire Connectors 1 Prefix symbol CN means connector can disconnect and reconnect 2 Prefix symbol CL means wire solder holes of the PCB wire is soldered directly 5 Note Mark is a leadless chip component 6 Mode SP 7 Voltage indications for PLAY mode on ...

Page 23: ...1 9 3 1 9 4 1 9 5 Main 1 4 Schematic Diagram PWR VCR PM REC ...

Page 24: ...1 9 6 1 9 7 1 9 8 Main 2 4 Schematic Diagram ...

Page 25: ...before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SAME TYPE FUSE ATTENTION POUR UNE PROTECTION CONTINUE LES RISQES D INCELE N UTILISER QUE DES FUSIBLE DE MEMO TYPE RISK OF FIRE REPLACE FUSE AS MARKED This symbol means fast operating fuse Ce symbo...

Page 26: ...1 9 11 1 9 12 Main 4 4 Schematic Diagram ...

Page 27: ...1 9 13 1 9 14 Function Schematic Diagram ...

Page 28: ...Function CBA Top View Function CBA Bottom View 1 9 15 1 9 16 ...

Page 29: ...t circuit is measured using hot GND as a common terminal BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT AN ISOLATION TRANSFORMER MUST BE USED ALSO IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT SLOWLY WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SA...

Page 30: ...ND as a common terminal BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT AN ISOLATION TRANSFORMER MUST BE USED ALSO IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT SLOWLY WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY CIRCUIT A VARIABLE ISOLATION TRANSFORMER IS REQUIRED CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SAME TYPE FUSE ATTENTION POUR UNE P...

Page 31: ... V COM 2 V L 2 3 V L 1 4 P ON 5V 1 C F R 2 C FG 3 AL 15 5V 12V 4 C POW SW 5 C CONT 6 FG GND 7 CM GND 8 FE H 1 FE H GND 2 CN501 CN504 CN251 CN503 CAPSTAN MOTOR P ON 5V C F R C FG AL 15 5V 12V C POW SW C CONT FG GND CM GND FULL ERASE HEAD FE HEAD VIDEO R 1 HEAD VIDEO L 1 HEAD DECK ASSEMBLY MAIN CBA GND KEY 2 2 1 2 KEY 1 3 1 3 FUNCTION CBA CN651 CN507 AC CORD ANT IN ANT OUT VIDEO OUT AUDIO IN R AUDIO...

Page 32: ... Loading REV LM FWD L LM REV H Stop A Loading Stop B Unloading Note Symbol Loading Status EJ Eject CL Eject REW Reel SB REW Reel Stop B TL Stop B Brake Cancel FB Brake Cancel SF Stop A AU Stop A Play REC AL Play REC Still Slow SS Still Slow Capstan Reversal GC Capstan Reversal RS REW Search RS RS REW Search Note 1 11 1 13 RF SW F AD Internal Signal 5 C DRIVE 37 PB CTL 10 C F R 11 H A SW 12 ROTA AT...

Page 33: ...ignal 5 C DRIVE 37 PB CTL 10 C F R 11 H A SW 12 ROTA STILL STILL AT ST BL Stop detection T2 Acceleration Detection T1 Slow Tracking Value Reversal Limit Value FRAME ADVANCE The first rise of RF SW after a rise in F AD signal Fig 2 1 11 3 ...

Page 34: ...FWD LD FWD LD REV LD REV LD REV 0 5S PIN NO CL EJ SB TL SB GC FB GC SS AL SS AU AU TL 74 LD SW CL GC 59 LM FWD M REV C DRIVE Z ON ON VCR 48 C F R DRUM ROTATION 60 P ON POWER OFF STOP PLAY RS FS STILL SLOW PLAY STOP PLAY 13 A MUTE H 62 D REC H 2 TV VCR 61 D PB L DISPLAY PAUSE SLOW AU RS AL AL AL SF SS AL AU AU AU SF FB SF SF AL AL 2 5S 0 2S 0 1S EJ AL RS SF AU TL FB SS SB 0 2S 0 8S 0 3S 1 0S 0 2S 0...

Page 35: ...D REV FF PIN NO SF FB TL AL GC FB GC SS AL SS AU AU TL 74 LD SW CL GC 59 LM FWD M REV C DRIVE Z ON ON VCR 48 C F R DRUM ROTATION 60 P ON STOP FF STOP REW STOP REC REC REC PAUSE STOP 13 A MUTE H 62 D REC H 2 TV VCR 61 D PB L DISPLAY PAUSE REC or PAUSE STOP EJECT STOP EJECT STOP EJECT AU FB FB AU SS GC RS AL AL SF FB TL SB CL EJ RS SS GC AL AU AU AU FB SF SF SF SF SF AU AL AL FB SF EJ AL RS SF AU TL...

Page 36: ...L 20 OUT REC CTL Record Control Signal H L 21 IN C SYNC Composite Synchronized Pulse PULSE 22 GND GND 23 N U Not Used 24 OSDVss OSDVss Pin No IN OUT Signal Name Function Active Level 25 IN REC SAF SW Recording Safety SW Detect With Record tab L With out Record tab H H L 26 IN C VIDEO IN Composite Video Signal Input Slicer 27 IN V HOLD Condenser Connected Terminal Slicer 28 HLF LPF Connected Termin...

Page 37: ...END S Tape End Position Detect Signal A D 69 IN AFC Automatic Frequency Control Signal A D 70 IN V ENV Video Envelope Comparator Signal A D Pin No IN OUT Signal Name Function Active Level 71 IN PG DELAY Video Head Switching Pulse Signal Adjusted Voltage A D 72 IN KEY 1 A D Key Data Signal A D 73 IN KEY 2 A D Key Data Signal A D 74 IN LD SW Deck Mode Position Detect Signal A D 75 IN ST S Tape Start...

Page 38: ...1 51 LA71091M QSZAA0RMB019 E C B BN1F4M T BA1F4M T KTA1266 GR KTC3193 Y KTC3199 Y GR BL 2SC2785 J H F K 2SC2058 Q KRA103M KRC103M DTC124ESA 2SA1015 GR TPE2 DTA124ESA 2SC1815 Y TPE2 2SC1815 GR TPE2 2SC3331 T U 2SC2120 Y TPE2 KTC3203 Y 2SC1815 BL TPE2 2SC2001 K L E C B E C B 2SC536NF NG NPA AT E C ST 304L A B C D S D G 2SK2599 E C PT204 6B 12 60 LA72653M 21 40 41 20 1 80 61 1 13 1 ...

Page 39: ...edures 2 3 1 Disassembly Assembly Procedures of Deck Mechanism 2 4 1 Alignment Procedures of Mechanism 2 4 9 DECK MECHANISM SECTION VIDEO CASSETTE RECORDER VT FX685A VT FX685AC DECK MECHANISM SECTION Standard Maintenance Mechanical Alignment Procedures Disassembly Assembly of Mechanism Alignment for Mechanism ...

Page 40: ...y B573 B574 Reel S Reel T B37 Capstan Motor B52 Cap Belt B73 FE Head B133 Idler Assembly B410 Pinch Arm A Assembly B414 M Brake S Assembly B416 M Brake T Assembly B525 LDG Belt Notes 1 Clean all parts for the tape transport Upper Drum with Video Head Pinch Roller Audio Control Head Full Erase Head using 90 Isopropyl Alcohol 2 After cleaning the parts do all DECK ADJUSTMENTS 3 For the reference num...

Page 41: ... rial but since it is very thin avoid cleaning it verti cally 2 Wait for the cleaned part to dry thoroughly before operating the unit 3 Do not reuse a stained head cleaning stick or a stained chamois cloth Cleaning of Audio Control Head Clean the head with a cotton swab Procedure 1 Remove the top cabinet 2 Dip the cotton swab in 90 isopropyl alcohol and clean the audio control head Be careful not ...

Page 42: ...se The Fixtures And Tape 1 Alignment Tape No 7099046 MH 1 2 Special Driver No 7099028 Item No Name Part No How to used 1 Alignment Tape 7099046 Head Switching Point Tape Interchangeability Alignment 2 Special Driver 7099028 Guide Roller 2 2 1 ...

Page 43: ...oving guide preparations are in the Eject Position 4 Turn the LDG Belt in the appropriate direction shown in Fig M1 until the Moving guide prepara tions come to the Eject Position Stop turning when the preparations begin clicking or can not be moved further However the tape will be left wound around the cylinder 5 Turn the LDG Belt in the appropriate direction con tinuously and the cassette tape w...

Page 44: ... that the tape is not creasing and that there is no slack on the supply and take up side Guide Rollers Use a blank tape Adjust the height of the Guide Rollers Supply side and take up side Use a blank tape pg 2 3 3 Loading Use a blank tape Adjust the envelope pg 2 3 4 Check the envelope Adjust the Audio Section Azimuth Alignment pg 2 3 4 Check the audio output Check the following 1 X Value pg 2 3 3...

Page 45: ...ing is apparent adjust the Tilt Adj Screw of the AC Head Fig M6 1 B X Value Alignment Purpose To align the Horizontal Position of the Audio Con trol Erase Head Symptom of Misalignment If the Horizontal Position of the Audio Control Erase Head is not properly aligned maximum envelope can not be obtained at the Neutral position of the Tracking Control Circuit 1 Connect the oscilloscope to TP301 C PB...

Page 46: ... height of Guide Roller 2 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 4 If the envelope is as shown in Fig M8 adjust the height of Guide Roller 3 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 5 When Guide Rollers 2 and 3 Refer to Fig M3 are aligned properly there is no envelope drop either at the beginning or end of track as shown in Fig M9 Not...

Page 47: ... Cylinder Assembly T DM1 DM6 3 S 5 Connector A Connector B 8 8 Loading Motor Assembly T DM1 DM7 2 S 6 S 7 LDG Belt ACH Connector AN 9P and 9B 9 1 Tape Guide Assembly T DM1 DM8 P 2 C 8 10 1 Door Opener B T DM1 DM8 S 8 L 2 11 10 Pinch Arm B Assembly T DM1 DM8 P 3 12 11 Pinch Arm A Assembly T DM1 DM8 13 13 FE Head T DM1 DM9 S 9 14 14 First Post Assembly T DM1 DM9 S 10 15 15 Prism T DM1 DM9 S 11 16 16...

Page 48: ... ADJUSTMENT CONDITION 32 28 TR Gear C B DM2 DM14 C 6 33 32 TR Gear Spring B DM14 34 33 TR Gear A B B DM1 DM14 35 34 FF Arm HI T DM1 DM14 36 28 Sensor Gear B DM1 DM15 C 7 37 28 Idler Assembly B DM1 DM15 38 28 BT Arm B DM2 DM15 P 5 39 28 Loading Arm S Assembly B DM2 DM15 Refer to Alignment Sec Pg 2 4 9 40 39 Loading Arm T Assembly B DM2 DM15 Refer to Alignment Sec Pg 2 4 9 41 28 M Brake T Assembly T...

Page 49: ... 25 39 20 21 40 27 28 24 30 29 26 31 32 38 22 Fig DM2 Bottom View 13 12 10 9 11 7 53 54 8 37 47 36 45 46 16 49 48 50 41 15 14 43 44 42 35 34 Fig DM1 Top View 2 4 3 ...

Page 50: ... Pin A Slots Pin C Pin B Pin D Locking tab View for A Pull up Slide Slot A Slot A First while pushing the locking tab as shown in the right slide and pull up the right side on 2 to release Pin A and Pin B from the slots A Then remove Pin C and Pin D on 2 from the slots B as shown 1 2 A S 19 Fig DM4 2 4 4 ...

Page 51: ...ig DM9 18 17 19 S 12 L 7 After removing the Screw S 12 while pressing the Locking Tab L 7 remove 17 Fig DM10 10 12 11 9 S 8 L 2 P 3 P 2 Adj Screw C 8 Pin of 11 Pin of 9 Grooves of 31 31 When reassembling 9 and 11 confirm that pin of 9 and pin of 11 are in the grooves of 31 as shown View for A A Fig DM8 2 4 5 ...

Page 52: ...the left figure and then install 26 while pressing the spring P 4 to the direction of the arrow in the left figure and confriming that the position of the spring P 4 is placed as shown in the left figure Pin on bottom of 26 Pin on 24 Pin on 25 Position of pins on 24 and 25 Top View Fig DM13 20 S 14 Cap Belt Fig DM11 2 4 6 ...

Page 53: ...hen reassembling 31 meet the first groove on 31 to the first tooth on 51 as shown 31 Top View First tooth on 51 First groove on 31 Pin of 41 Pin of 38 Position of Mode Lever when installed Pin of 42 Align 28 and 31 as shown Bottom View 31 28 Fig DM14 L 5 P 7 P 6 C 10 42 47 45 43 46 41 44 turn turn turn C 9 Fig DM16 2 4 7 ...

Page 54: ... 48 49 S 17 Slide Holder S Slide Holder T S 18 50 L 3 Fig DM17 52 51 Slide P 9 Fig DM18 2 4 8 ...

Page 55: ...anical or electrical parts Alignment points in Eject Position Alignment 1 Loading Arm S and T Assembly Install Loading Arm S and T Assembly so that their triangle marks point to each other as shown in Fig AL2 Alignment 2 Mode Gear Keeping the two triangles pointing at each other in stall the Loading Arm T Assembly so that the last tooth of the gear meets the most inside teeth of the Mode Gear See ...

Page 56: ...the Rack Assembly so that the first tooth on the gear of the Rack Assembly meets the first groove on the Cam Gear A as shown in Fig AL4 Cam Gear A First tooth First groove on the Cam Gear A Alignment 3 Top View Gear on Rack Assembly Fig AL4 2 4 10 ...

Page 57: ...xploded Views 3 1 1 Mechanical Parts List 3 2 1 Electrical Parts List 3 3 1 EXPLODED VIEWS AND PARTSLISTSECTION VIDEO CASSETTE RECORDER VT FX685A VT FX685AC EXPLODED VIEWS AND PARTS LIST SECTION Exploded views Parts List ...

Page 58: ...EXPLODED VIEWS Front Panel A1X 3 1 1 ...

Page 59: ...Parts List for parts with this mark Some Ref Numbers are not in sequence A5 A2 2L011 2L011 2L011 MAIN CBA AC001 2B8 2B34 2B24 2B3 2B3 FUNCTION CBA 2B43 2B44 2B5 2L021 2L021 2L023 2L023 2L021 2L021 2L021 2B46 2L022 2B45 3 1 2 ...

Page 60: ...mbly Top View Grease Point Mark Description Floil G 374G Blue grease B2 B35 B550 B410 B411 B494 L1471 B567 L1053 B74 B10 L1191 B73 L1463 B523 B9 B12 B492 B11 B571 B37 B126 B122 L1466 B501 B8 B121 B426 B560 L1450 L1051 L1460 B552 B510 B576 L1482 B577 L1482 B401 B402 Deck Mechanism View 1 3 1 3 ...

Page 61: ... B566 B133 B568 B572 B513 B502 B570 B491 B565 B584 B417 L1151 B525 B3 B522 B524 Motor PCB Ass y B31 L1406 B148 B521 B520 B416 B518 B564 B556 B487 B573 B574 B499 B27 B508 B414 B404 B403 B558 B557 B581 B583 B580 B582 B578 B579 B551 B512 Mark Description Floil G 374G Blue grease B569 B86 B505 Deck Mechanism View 2 3 1 4 ...

Page 62: ... not in sequence Mark Description Floil G 374G Blue grease B361 B359 B529 B360 B561 B303 B514 B555 B563 B300 B562 B313 B482 B355 B354 B319 B472 B483 B425 L1461 L1341 L1341 L1483 L1321 B347 L1321 Deck Mechanism View 3 3 1 5 ...

Page 63: ...60 TJ15104 ROLLER CLEANER B361 TJ15105 POST B401 TJ15176 CONNECTOR SYMBOL NO P NO DESCRIPTION B402 TJ15177 CONNECTOR B403 TJ13984 CONNECTOR B404 TJ15178 CONNECTOR B410 TJ15179 ARM PINCH B411 TJ15181 SPRING PINCH B414 TJ15289 BRAKE S B416 TJ15291 BRAKE T B417 TJ15184 SPRING TENSION B425 TJ15185 SPRING LOCK LEVER B426 TJ15186 PULLEY KICK B472 TJ15187 SLIDER R B482 TJ15188 PLATE CASSETTE B483 TJ15292...

Page 64: ...5313 SCREW M2 6X8 L1151 TJ15236 SCREW M2 6X4 L1191 TJ15313 SCREW M2 6X8 L1321 TJ10176 SCREW 3X6 L1341 TE13298 SCREW M2 6X6 L1406 TJ15238 HEAD AC L1450 TE12971 SCREW M2 6X5 L1460 TJ15239 SCREW M2 6X6 L1461 TJ14061 SCREW M2 6X6 L1463 TJ14063 SCREW M2 6X4 L1466 TJ14066 SCREW M2 6X6 L1469 TJ13452 SCREW M2 6X6 L1471 TJ14066 SCREW M2 6X6 L1482 TJ15241 SCREW M2 3X4 L1483 TJ15242 SCREW M2 6X8 L1484 TE1305...

Page 65: ...SISTOR KTC3199 Q052 TJ13923 TRANSISTOR BN1F4M Q055 TJ13924 TRANSISTOR 2SC536NF SYMBOL NO P NO DESCRIPTION Q056 TJ15283 TRANSISTOR 2SC2001 Q060 TJ13923 TRANSISTOR KRA103M Q061 TJ15315 TRANSISTOR 2SB892S Q062 TJ13923 TRANSISTOR KRA103M Q301 TC10784 TRANSISTOR KTA1266 Q302 TC10783 TRANSISTOR KTC3193 Q303 TC10783 TRANSISTOR KTC3193 Q391 TC10784 TRANSISTOR KTA1266 Q421 TC10784 TRANSISTOR KTA1266 Q422 T...

Page 66: ...J14089 JACK JK752 TJ14091 JACK JK753 TJ15136 JACK JK754 TJ13907 JACK JK755 TJ14092 JACK PS502 TJ15282 PHOTO INTERRUPTER RS501 TJ15284 REMOTE RECEIVER SA001 TC10891 SURGE ABSORBER ENC471D 10AC SW501 TE11957 SWITCH SW502 TE11957 SWITCH SW505 TE11957 SWITCH SW506 TE11161 SWITCH SW507 TJ15142 SWITCH MODE SW671 TE11957 SWITCH SW672 TE11957 SWITCH SW673 TE11957 SWITCH SW674 TE11957 SWITCH SW676 TE11957 ...

Page 67: ...VT FX685A VT FX685AC Digital Media Products Division Tokai VT FX685A FX685AC VT FX685A FX685AC No 5102E TK ...

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