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Hitachi VT-FX795A Service Manual Download Page 28

5-3

LD-SW

Pin

Hole

Hole

Shaft

Cam Gear

[6] Main CBA

[5] Deck Assembly

[6] Main CBA

SW512
LD-SW

Pin

Fig. D5

Summary of Contents for VT-FX795A

Page 1: ...SERVICE MANUAL VIDEO CASSETTE RECORDER TK No 5301E VT FX795A March 2003 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT Digital Media Division Tokai ...

Page 2: ...nary Final Checking and Alignment of Tape Path 4 6 1 B X Value Alignment 4 6 1 C Checking Adjustment of Envelope Waveform 4 7 1 D Azimuth Alignment of Audio Control Erase Head 4 7 5 DISASSEMBLY AND REASSEMBLY 5 1 5 1 CABINET DISASSEMBLY INSTRUCTIONS 5 1 5 1 1 Disassembly Flowchart 5 1 5 1 2 Disassembly Method 5 1 5 2 DISASSEMBLY ASSEMBLY PROCEDURES OF DECK MECHANISM 5 4 5 3 ALIGNMENT PROCEDURES OF...

Page 3: ... 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 solder ing F Observe that the wires do not con...

Page 4: ...and externally exposed accessible parts RF termi nals antenna terminals video and audio input and output terminals 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 voltmeter to measure across the terminals of load Z See Fig...

Page 5: ...2 Remove the flat 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 1 Release the flat pack IC from the CBA using twee zers Fig S 1 6 Caution 1 Do not supply hot air to the chip parts around the f...

Page 6: ... of 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...

Page 7: ...due to 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 prop erly grounded to remove any static electricity that may be charged on the body 2 Ground for Workbench 4 Be sure to place a conductive sheet or copper plate with proper grounding 1MΩ on the workbench or other surface where the semi c...

Page 8: ...ility 125 cable channel Type Auto programming frequency synthesis Power Input AC120V 60Hz Power Consumption 14W nominal Cabinet Size 14 1 4 W x 3 5 8 H x 8 1 2 D 360 mm W x 92 mm H x 216 mm D Weight 4 0 lbs 1 8 kg approx Storage Temperature 4 F to 131 F Operating Temperature 41 F to 104 F 5 C to 40 C Check your cable company s compatibility requirements Designs and specifications are subject to ch...

Page 9: ...nnel Setting O Manual Channel Setting Number of Timer Programming 7 Program year 7 Program year Self Diagnosis Funtion O 4 Modes O 4 Modes Back up Time 30 s 30 s SQPB O O Surge Absorber O O Auto Power Off Feature O O Local Broadcast Setting O O Multi Search Feature O Index Time Search O Index Time Search Search Speed SP X5 EP X5 X15 SP X5 EP X5 X15 FF REW Time T 120 Tape FF approx 4 min REW approx...

Page 10: ...Audio Signal Process LA72670M IC451 LA72655M IC451 Linear Audio Signal Process Included in IC301 Included in IC301 System Control Main Microcomputer µP MN101D08EFA4 IC501 M37765MAA1N1GP IC501 VCR EEP ROM Reset Loading Motor Drive Cylinder Loading Motor Control Power Reset Timer Display Driver Included in IC501 Included in IC501 Power Switching Driver ...

Page 11: ... MODE VCR VCR ON OFF CLOCK 88 88 PM ON ON OFF POWER ON PWR ON REC REC ON REC PAUSE REC Blinks at 0 8Hz interval T REC OTR ON T REC OFF T REC incomplete Blinks at 0 8Hz interval When reel and capstan mechanism is not functioning correctly 1 Blinks at 0 8Hz interval When tape loading mechanism is not func tioning correctly 2 Blinks at 0 8Hz interval When cassette loading mechanism is not functioning...

Page 12: ... R IN 25 19 20 21 24 23 22 1 Cassette Compartment 2 F FWD button 3 PLAY button 4 REW button 5 STOP EJECT button 6 REC IRT button 17 Display Window 18 Remote Sensor 19 CHANNEL buttons 10 POWER button 11 AUDIO Input jacks 12 VIDEO Input jack 13 PWR indicator 14 TAPE IN indicator 15 VCR indicator 16 REC indicator 17 TIMER indicator 18 CLOCK indicator Front Panel VIDEO OUT Jack Connect a video cable g...

Page 13: ...Check Video signal at pin 38 or pin40 of IC301 Check A V cable Cleaning Video the Head See page 3 6 Check IC301 Q301 X301 etc Check Cylinder Assembly NG NG Cleaning Video Head See page 3 6 Check Cylinder Assembly NG OK Check Video signal at pin 35 of IC301 Check Q391 TU701 or V OUT jack Check IC301 Q301 X301 etc Video problem 1 No recording Video Video problem 2 No playback Video 3 1 TROUBLESHOOTI...

Page 14: ...96 of IC301 OK Check Audio signal at pin 80 or pin78 or pin2 of IC451 OK Check IC451 Check Tape Interchangeability Alignment See page 4 5 Check Tape Interchangeability Alignment See page 4 5 NG Cleaning the Audio Control Erase Head See page 3 6 NG Check ACE Head Assembly NG Cleaning the Audio Control Erase Head See page 3 6 NG Check ACE Head Assembly Check TU701 or A OUT jack NG Check IC451 NG Che...

Page 15: ...t pin 69 or pin71 or pin 7 or pin9 of IC451 Check A V cable Cleaning the Video Head See page 3 6 OK Check Audio signal at pin 80 or pin78 or pin2 of IC451 OK Check IC451 Check Cylinder Assembly Cleaning the Video Head See page 3 6 NG Check Cylinder Assembly Check TU701 or A OUT jack NG Check IC451 NG NG Audio problem 3 No recording Hi Fi Audio Audio problem 4 No playback Hi Fi Audio ...

Page 16: ...lowing parts Remove the part from PCB Switching FET Q001 source resistor R014 gate resistor R008 and start resistor R004 and R005 Repair method 3 A circuit to turn on switching FET Q001 may not work and this may be regarded as a cause of trouble Even if the load at the secondary side is short circuited it cannot be detected because switching FET Q001 does not turn on Therefore perform check accord...

Page 17: ...odel only h Hours Check I Change Deck Periodic Service Schedule Ref No Part Name 1 000 h 2 000 h 3 000 h 4 000 h B2 Cylinder Assembly I I B3 Loading Motor Assembly I B8 Pulley Assembly I I B587 Tension Lever Assembly I I B31 ACE Head Assembly I B573 B574 Reel SP D2 Reel TU D2 I B37 Capstan Motor I I B52 Cap Belt I I B73 FE Head I B133 B134 Idler Gear Idler Arm I I B410 Pinch Arm Assembly I I B414 ...

Page 18: ...ial but since it is very thin avoid cleaning it vertically 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 Erase 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 erase head Be car...

Page 19: ...to the Deck Mechanism Assembly and press the PLAY button The tape will be loaded into the Deck Mechanism Assembly Make sure the power is on TP502 SENSOR INHIBITION to J20 GND This will stop the function of Tape Start Sensor Tape End Sensor and Reel Sensors If these TPs are con nected before plugging in the unit the function of the sensors will stay valid See Fig 1 Note Because the Tape End Sensors...

Page 20: ...wdriver 4 2 FIXTURE AND TAPE FOR ADJUSTMENT 4 2 1 How To Use The Fixtures And Tape Item No Name Part No Adjustment 1 Alignment Tape 7099046 I Head Switching Point I Tape Interchangeability Alignment 2 Guide Roller Adj Screwdriver 7099028 I Guide Roller 3 Flat Screwdriver Purchase Locally I X Value Alignment ...

Page 21: ...al trace with 10 1 probe V Range 0 001 50V Div F Range DC AC 20MHz 2 Alignment Tape MH 1 4 3 2 Head Switching Position Adjustment Purpose To determine the Head Switching point during playback Symptom of Misadjustment May cause Head Switching noise or vertical jitter in the picture Reference Notes Playback the Alignment tape and adjust VR501 so that the V sync front edge of the CH1 video output wav...

Page 22: ... that the Moving 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 cass...

Page 23: ...ue and envelope Not good Do the final tape traveling test to see that the tape runs normally in play mode with out creasing or slacking Completion Not good OK OK OK Not good Not good OK Flowchart of Alignment for tape traveling 1 A 1 A 1 B 1 C 1 C 1 D 1 D 1 B 1 C 1 B 1 C 1 A 4 4 2 Tape Interchangeability Alignment Note To do these alignment procedures make sure that the Tracking Control Circuit is...

Page 24: ...al Position of the Audio Control 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 and TP513 CTL on the Main CBA Use TP302 RF SW as a trigger 2 Playback the Gray Scale of the Alignment Tape MH 1 and...

Page 25: ...de 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 Note Upon complet...

Page 26: ... and L 2 are fragile Be careful not to break them 1 Release Locking Tab L 3 and remove five Screws S 2 Then slowly lift the VCR Chassis Unit Deck Assembly Function CBA and Main CBA up 2 When reassembling solder wire jumpers as shown in Fig D4 3 Before installing the Deck Assembly be sure to place the pin of LD SW on Main CBA as shown in Fig D5 Then install the Deck Assembly while aligning the hole...

Page 27: ... Cylinder Assembly ACE Head Assembly 6 Main CBA BOTTOM VIEW From FE Head From Cylinder Assembly From ACE Head Assembly Lead with blue stripe Printing side Lead with blue stripe From Capstan Motor Assembly Lead connections of Deck Assembly and Main CBA Desolder Desolder S 3 S 3 4 Cylinder Shield S 4 Fig D4 ...

Page 28: ...5 3 LD SW Pin Hole Hole Shaft Cam Gear 6 Main CBA 5 Deck Assembly 6 Main CBA SW512 LD SW Pin Fig D5 ...

Page 29: ...M6 Desolder 3 S 2 8 8 Loading Motor Assembly T DM1 DM7 Desolder LDG Belt 2 S 3 9 9 ACE Head Assembly T DM1 DM7 S 4 10 2 Tape Guide Arm Assembly T DM1 DM8 P 2 11 10 C Door Opener T DM1 DM8 L 4 12 11 Pinch Arm B T DM1 DM8 P 3 13 12 Pinch Arm Assembly T DM1 DM8 14 14 FE Head Assembly T DM1 DM9 S 5 15 15 Prism T DM1 DM9 S 6 16 2 15 Sensor Gear T DM1 DM15 17 2 Slider Shaft T DM10 L 5 18 17 C Drive Leve...

Page 30: ...stallation Refer to Deck Exploded Views for lubrication 33 32 Loading Arm TU Assembly B DM2 DM14 Refer to Alignment Sec Page 5 12 34 2 25 M Brake TU Assembly T DM1 DM15 P 7 Brake Belt 35 2 25 M Brake SP Assembly T DM1 DM15 P 8 36 35 Tension Lever Assembly T DM1 DM15 37 36 T Lever Holder T DM15 L 12 38 34 Reel TU D2 T DM1 DM15 39 38 M Gear T DM1 DM15 40 36 Reel SP D2 T DM1 DM15 41 32 36 Moving Guid...

Page 31: ...5 6 14 13 11 10 12 7 46 8 30 40 16 39 38 42 41 43 9 34 15 36 35 Fig DM1 Top View 29 32 20 33 24 25 27 26 23 28 31 21 22 Fig DM2 Bottom View ...

Page 32: ... 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 Fig DM4 2 Pin A Slots B Pin C Pin B Pin D Pull up Slide Slot A Slot A 1 2 A 3 4 5 6 L 1 L 2 P 1 Fig DM5 L 3 Fig DM6 View for A Desolder from bottom Lead with Red Stripe L 14 46 47 7 S 2 A ...

Page 33: ...e A 8 9 S 4 S 3 LDG Belt 28 11 13 12 A 10 L 4 Adj Screw P 3 P 2 When reassembling 10 and 12 confirm that pin of 10 and pin of 12 are in the groove of 28 as shown Pin of 12 Pin of 10 Groove of 28 View for A Fig DM8 Fig DM9 14 15 S 6 S 5 16 Fig DM10 18 17 19 S 7 L 5 P 4 ...

Page 34: ...shown in the left figure and then install 23 while pressing the spring P 5 to the direction of the arrow in the left figure and confirming that the position of the spring P 5 is placed as shown in the left figure Pin on 22 Position of pin on 22 Top View L 6 22 23 P 5 Pin on bottom of 23 23 21 C 1 C 4 ...

Page 35: ...First groove on 28 Align 25 and 28 as shown Bottom View 28 Pin of 34 Pin of 31 Position of Mode Lever when installed Pin of 35 Fig DM13 25 24 C 3 S 9 25 27 26 28 C 2 L 8 L 9 L 10 Refer to the Alignment Section Page 5 12 Fig DM14 31 30 29 L 11 P 6 32 33 Fig DM15 35 37 turn turn 38 39 40 36 P 8 P 7 turn Break belt 34 L 12 ...

Page 36: ...5 11 Fig DM16 41 42 43 L 13 44 45 Slide Fig DM17 ...

Page 37: ... mechanical or electrical parts Alignment points in Eject Position Alignment 1 Loading Arm SP and TU Assembly Install Loading Arm SP and TU 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 install the Loading Arm TU Assembly so that the last tooth of the gear meets the most inside teeth of the Mode ...

Page 38: ...B5 2L023 2L023 AC001 A2 2L011 2L011 2L011 A5 SENSOR CBA COMPONENT REPLACEMENT SENSOR CBA COMPONENT REPLACEMENT MAIN CBA COMPONENT REPLACEMENT 2L031 2L099 2B8 2L051 2B34 A1X F001 6 1 EXPLODED VIEWS 6 1 1 Cabinet Section EXPLODED VIEWS AND PARTS LIST 6 ...

Page 39: ...ew Lubricating Point Chassis Assembly Bottom View Lubricating Point B2 B35 B410 B411 B494 B567 L1053 B74 B10 L1191 B73 B9 B12 B492 B11 B571 B37 B126 L1466 B501 B8 B121 B426 B560 L1450 L1450 L1051 L1467 B553 Mark Description Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 ...

Page 40: ...B507 B488 B134 B133 B568 B593 B570 B491 B565 L1151 B525 B592 B31 L1406 B148 B521 B520 B590 B564 B487 B573 B574 B499 B587 B508 B558 B557 B3 B417 B591 B522 B414 B416 Mark Description Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 SANKOUL FG84M Yellow grease B513 B502 6 1 3 Deck Mechanism View 2 Section ...

Page 41: ...55 B563 B300 B562 B482 B355 B354 B483 B425 L1321 B347 L1321 B361 B359 B529 B360 B514 B313 Mark Description Floil G 684G or Multemp MH D Blue grease SLIDUS OIL 150 1 2 3 4 J K L 6 1 4 Deck Mechanism View 3 Section ...

Page 42: ...S18421 BRAKE TU B417 TJ16965 TENSION SPRING B425 TJ15185 LOCK LEVER SPRING B426 TJ15186 KICK PULLEY B482 TJ16908 CASSETTE PLATE SYMBOL NO P NO DESCRIPTION B483 TJ16909 LOCK LEVER B487 TJ16911 BAND BRAKE B488 TJ16912 MODE LEVER B491 TJ16913 CAM GEAR B492 TJ16914 MODE GEAR B494 TJ16915 DOOR OPENER C B499 TJ16916 LEVER HOLDER T B501 TJ16917 WORM HOLDER B502 TJ16918 CAM GEAR B B507 TJ14034 WASHER B508...

Page 43: ...6 6 ACCESSORIES X1 TJ16963 REMOTE CONTROL UNIT X3 TE15081 RF CABLE SYMBOL NO P NO DESCRIPTION SYMBOL NO P NO DESCRIPTION ...

Page 44: ...ANSISTOR KTA1266 GR Q302 TC10783 TRANSISTOR KTC3193 Y Q303 TC10783 TRANSISTOR KTC3193 Y Q391 TC10784 TRANSISTOR KTA1266 GR Q421 TC10784 TRANSISTOR KTA1266 GR Q422 TE13235 TRANSISTOR KTC3203 Y Q425 TJ13923 TRANSISTOR KRA103M Q426 TE15523 TRANSISTOR RN1511 TE85R Q501 TE13243 TRANSISTOR KTC3199 BL SYMBOL NO P NO DESCRIPTION Q503 TJ15141 PHOTO TRANSISTOR PT204 6B 12 Q504 TJ15141 PHOTO TRANSISTOR PT204...

Page 45: ... 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 specified Values in schematic diagrams The values dielectric strength power capacitance and tolerances of the resistors excluding variable resistors and capacitors are indicated in the sche matic diagrams using abbr...

Page 46: ...ty 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 Voltage indications for PLAY and REC modes on the schematics are as shown below 6 How to r...

Page 47: ... 2 C F R 3 C FG 4 C CONT 5 GND 6 LM FWD REV 7 D CONT 8 D PFG 9 GND 10 AL 12V 11 AL 15V 12 FE H 1 FE H GND 2 CL501 CL502 CL504 CL253 CAPSTAN MOTOR FULL ERASE HEAD FE HEAD VIDEO R 1 HEAD VIDEO L 1 HEAD AC CORD ANT IN ANT OUT VIDEO OUT AUDIO IN R AUDIO IN L VIDEO IN AUDIO OUT R AUDIO OUT L REAR VIDEO IN AUDIO IN R AUDIO IN L FRONT VIDEO L 2 HEAD VIDEO R 2 HEAD Hi Fi AUDIO R HEAD Hi Fi AUDIO L HEAD M ...

Page 48: ...4 3 1 Main 1 5 Schematic Diagram 3 SCHEMATIC DIAGRAMS ...

Page 49: ...5 3 2 Main 2 5 Sensor Schematic Diagrams ...

Page 50: ...6 3 3 Main 3 5 Schematic Diagram ...

Page 51: ...ower supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail A V F 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 MÊME TYPE RISK OF FIRE REPLACE FUSE AS MARKED Th...

Page 52: ...8 3 5 Main 5 5 Schematic Diagram ...

Page 53: ...T E E 10usec 50mV x 10 J23 of Main CBA WF3 UPPER WF1 LOWER V OUT 0 1V x 10 RF SW 0 5V x 10 50usec J23 of Main CBA TP502 of Main CBA WF2 C PB 10mV x 10 RF SW 0 5V x 10 5msec UPPER LOWER WF1 TP502 of Main CBA TP301 of Main CBA ...

Page 54: ...it If Main Fuse F1001 is blown check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail A V F CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH THE SAME TYPE FUSE ATTENTION POUR UNE PROTECTION CONTINUE LES RISQES D INCELE N UTIL...

Page 55: ...r supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail A V F 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 MÊME TYPE RISK OF FIRE REPLACE FUSE AS MARKED This ...

Page 56: ...R501 TIMER 5V TP506 TP505 D PB L TRICK H SP LP SLP 26 SP LP SLP P ON L 22 P ON L P DOWN L 1 P DOWN L H A SW 79 H A SW H A COMP 80 H A COMP D PB L D REC H SW511 REC SW FROM TO VIDEO BLOCK TO AUDIO BLOCK FROM TO Hi Fi AUDIO BLOCK CLOCK DATA TU701 TUNER UNIT 23 INSEL ST SL INSEL ST SL 16 11 12 VCR TV 5 LD SW 68 AL 12V AL 5V AL 5V SW512 AL 12V AL 15V P ON 5V LD SW AL 5V D555 S LED FROM TO POWER SUPPLY...

Page 57: ...C301 VIDEO SIGNAL PROCESS HEAD AMP 35 REC VIDEO SIGNAL PB VIDEO SIGNAL MODE SP REC 13 88 89 90 91 42 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 SP LP SLP SP LP SLP C ROTA D V SYNC C ROTA 34 ...

Page 58: ... A OUT L 4 A PB REC CL504 3 A COM 1 AE H 2 AE H FE H AUDIO HEAD AUDIO ERASE HEAD ACE HEAD ASSEMBLY FE HEAD DECK ASSEMBLY 1 FE H 2 FE H GND CL501 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 L FROM SERVO SYSTEM CONTROL BLOCK FULL ERASE HEAD 78 80 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 JK755 A OUT...

Page 59: ...L P R HOLD PULSE NOISE DET ALC 34 33 23 4 80 2 78 37 38 54 77 1 39 26 24 27 SIF A IN R A IN L N A OUT A IN R F A IN L F LIM 49 MUTE A OUT L MOD A A OUT R N A IN Hi Fi H SW A MUTE H NORMAL H 40 ST SAP MODE FROM TO AUDIO BLOCK IIC BUS SDA IIC BUS SCL P ON 9V TO SERVO SYSTEM CONTROL BLOCK Hi Fi AUDIO R HEAD Hi Fi AUDIO L HEAD CYLINDER ASSEMBLY MAIN CBA Hi Fi A R 7 Hi Fi COM 8 Hi Fi A L 9 CL253 IC451 ...

Page 60: ... MARKED Ce symbole reprèsente un fusible à fusion rapide 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 MÊME TYPE RISK OF FIRE This symbol means fast operating fuse A V F CAUTION Fixed voltage or Auto voltage selectable power supply circuit is used in this unit If Mai...

Page 61: ...1 98V 1 80V SM 3 20V 3 75V 3 40V AU 0 26V 0 65V 0 44V AL 4 51V 5 00V 5 00V SS 2 61V 3 19V 2 97V RS Note Note EJ RS Loading FWD LM FWD REV H RS EJ Loading REV LM FWD REV L 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 FF REW SF FF REW Stop M FF REW SM Stop M FF REW Stop A AU Stop A Play REC AL Play REC...

Page 62: ... RF SW F AD Internal Signal C DRIVE PB CTL 27 C F R 79 H A SW 78 ROTA AT H Z H L L ST BL STILL FRAME ADVANCE STILL The first rise of RF SW after a rise in F AD signal Stop detection T2 Slow Tracking Value Acceleration Detection T1 Reversal Limit Value 20ms Fig 1 ...

Page 63: ... Internal Signal C DRIVE PB CTL 27 C F R 79 H A SW 78 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 20ms Fig 2 ...

Page 64: ...LD REV 0 2S 0 5S PIN NO CL EJ SS SS AU AU TL LD SW CL SS LM FWD M REV C DRIVE Z ON ON C F R DRUM ROTATION P ON A MUTE H D REC H D PB PAUSE SLOW AU AL AL AU SF SM EJ AU RS SF SM TL FB AL SB 74 21 27 22 7 23 24 TV VCR 77 POWER OFF STOP PLAY RS FS STILL SLOW PLAY STOP PLAY DISPLAY 0 1S SB TL SB FB SM SM SF AL AL RS AU AL SS AU AL SM 0 8S 0 2S 0 3S 1 0S 0 2S 1 5S 2H 2 5S 4H 0 5S 0 2S 0 8S 2H 1 2S 4H 0...

Page 65: ...A LD REV FF LD REV LD REV LD FWD LD FWD LD FWD LD FWD LD FWD LD FWD LD FWD REC PAUSE REC REC REW LD REV LD REV LD REV LD REV LD REV LD REV LD REV PAUSE REC or PAUSE STOP EJECT STOP EJECT STOP EJECT 2 STOP A FF STOP A REW STOP A REC PAUSE PAUSE or REC STOP A EJECT STOP FF STOP REW STOP REC REC REC PAUSE STOP TL TL SM SM SF SF AL AL SM AL AL AL AU AU SM TL SB EJ RS RS SM SM SF FB SM AU AU SS SS SS S...

Page 66: ... Playback H Hi z L 17 N U Not Used 18 OUT RF SW Video Head Switching Pulse H L 19 OUT D V SYNC Dummy V sync Output H Hi z 20 IN RESET System Reset Signal Reset L L 21 OUT LM FWD REV Loading Motor FWD REV Out put H Z L 22 OUT P ON L Power On Signal to Low L 23 OUT D PB L Playback Instruc tion Signal L 24 OUT D REC H Delayed Record Signal H 25 OUT Hi Fi H SW HiFi Audio Head Switching Pulse H L 26 OU...

Page 67: ...T SAP IN Tuner Stereo Sap Detector Signal Input A D 62 IN END S Tape End Posi tion Detect Signal A D 63 IN AFC Automatic Frequency Con trol Signal A D 64 IN V ENV Video Envelope Comparator Sig nal A D Pin No IN OUT Signal Name Function Active Level 65 IN PG DELAY Video Head Switching Pulse Signal Adjusted Voltage A D 66 IN KEY 2 A D Key Data Signal 2 A D 67 IN KEY 1 A D Key Data Signal 1 A D 68 IN...

Page 68: ...RC103M KRA103M 2SC1815 BL TPE2 2SC1815 Y TPE2 2SC1815 GR TPE2 2SC2120 Y TPE2 KTC3203 Y 2SA1015 GR TPE2 2SC2001 K L E C B A K C E LTV 817 B C F 81 80 31 100 50 30 1 51 LA71091M MID 32A22 PT204 6B 12 E C Note A Anode K Cathode E Emitter C Collector B Base R Reference G Gate D Drain S Source RN1511 TE85R FMG4A T148 B1 B2 C2 C1 E 28 15 14 PT6958 FN TP 1 ...

Page 69: ...VT FX795A VT FX795A VT FX795A No 5301E TK Digital Media Division Tokai ...

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