Sony SVT-N72P Service Manual Download Page 6

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SVT-N72P (E)

3-3.

Cassette Drive Mechanism ................................................................ 2-12

3-3-1.

Cassette Mechanism Assembly ................................................ 2-12

3-3-2.

Cassette Drive Gear .................................................................. 2-12

3-3-3.

Door Opener, Under Frame and Stand L ................................. 2-13

3-3-4.

Start Rack Gear and Front Rack Gear ...................................... 2-13

3-4.

Cleaner Roller Assembly .................................................................. 2-14

3-5.

Cylinder (Drum) ................................................................................ 2-15

3-5-1.

Cylinder (Drum) Motor, Upper Cylinder Assembly ................ 2-15

3-5-2.

Cylinder Mounting ................................................................... 2-16

3-6.

FE Head and ACE Head ................................................................... 2-17

3-6-1.

Audio R/P Head Assembly (ACE Head) ................................. 2-17

3-6-2.

Full Erase Head ........................................................................ 2-17

3-7.

Capstan Motor ................................................................................... 2-18

3-7-1.

Capstan Motor .......................................................................... 2-18

3-7-2.

Capstan Brake Assembly ......................................................... 2-19

3-8.

Loading Motor Assembly and Worm Gear Assembly ...................... 2-19

3-9.

Pinch Roller Pressur Mechanism ...................................................... 2-20

3-9-1.

Pinch Roller Lever Assembly .................................................. 2-20

3-9-2.

Pinch Lift Cam and Pinch Cam Gear ....................................... 2-21

3-10. L Guide Act Lever Assembly, Load Lever Assembly and

Stopper Lever Assembly ................................................................... 2-22

3-11. BT Lever Assembly .......................................................................... 2-22

3-12. Reel Drive Mechanism ...................................................................... 2-23

3-12-1. Reel Belt, Reel Pulley, Friction Gear Assembly and

Clutch Change Lever ................................................................ 2-23

3-12-2. Clutch Mounting Assembly ..................................................... 2-23

3-12-3. S Soft Lever, Supply Reel Assembly and S Reel Gear ............ 2-24

3-12-4. T Soft Brake Assembly, Take Up Reel Assembly,

T Reel Gear .............................................................................. 2-24

3-13. Brakes ................................................................................................ 2-25

3-13-1. S Brake Assembly, T Brake Assembly, T Brake Act Slide ..... 2-25

3-13-2. Brake Control Lever and Brake Act Lever Assembly ............. 2-25

3-13-3. S Brake Act Slide and BT Spring Lever Assembly ................. 2-26

3-14. Guides ............................................................................................... 2-27

3-14-1. Guide Roller Assembly ............................................................ 2-27

3-14-2. S and T Incline Mounting Assemblies ..................................... 2-27

3-15. Wheel Gear 2, Main Cam and OPT Pinch Relay Gear ..................... 2-28

3-16. Crescent Slide .................................................................................... 2-29

3-17. S Load Gear, T Load Gear, S Load Lever Assembly and

T Load Lever Assembly .................................................................... 2-30

3-18. Tape Sensors, Reel Sensor and EP SW Lever .................................. 2-31

3-18-1. Tape Top Sensor and Tape End Sensor ................................... 2-31

3-18-2. Reel Sensor ............................................................................... 2-31
3-18-3. EP Switch Lever ....................................................................... 2-32

Summary of Contents for SVT-N72P

Page 1: ...TIME LAPSE VIDEOCASSETTE RECORDER SVT N72P SERVICE MANUAL 1st Edition ...

Page 2: ...erden Um die Gefahr eines elektrischen Schlages Feuergefahr und Verletzungen zu vermeiden sind bei Wartungsarbeiten strikt die Angaben in der Anleitung zu befolgen Andere als die angegeben Wartungsarbeiten dürfen nur von Personen ausgeführt werden die eine spezielle Befähigung dazu besitzen AVERTISSEMENT Ce manual est destiné uniquement aux personnes compétentes en charge de l entretien Afin de ré...

Page 3: ...t batteribyte Använd samma batterityp eller en likvärdig typ som rekommenderas av apparattillverkaren Kassera använt batteri enligt gällande föreskrifter VAROITUS Paristo voi räjähtää jos se on virheellisesti asennettu Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin Hävitä käytetty paristo valmistajan ohjeiden mukaisesti 1 P For the customers in the Netherlands Voor de klanten i...

Page 4: ......

Page 5: ...m 2 1 1 1 Regular Checks and Maintenance Items 2 1 1 1 1 Regular Checks 2 2 1 2 Service Tools and Cleaning 2 3 1 2 1 Service Tools 2 3 1 2 2 Cleaning 2 4 2 An Overview of the Mechanism 2 5 2 1 Names of the Main Parts 2 5 2 1 1 Cassette Mechanism Assembly 2 5 2 1 2 Topview 2 6 2 1 3 Underside 2 7 2 2 An Overview of the Mechanism Modes 2 8 2 2 1 Mechanism Mode Switching Table 2 8 2 2 2 Movement Chec...

Page 6: ...sembly and Stopper Lever Assembly 2 22 3 11 BT Lever Assembly 2 22 3 12 Reel Drive Mechanism 2 23 3 12 1 Reel Belt Reel Pulley Friction Gear Assembly and Clutch Change Lever 2 23 3 12 2 Clutch Mounting Assembly 2 23 3 12 3 S Soft Lever Supply Reel Assembly and S Reel Gear 2 24 3 12 4 T Soft Brake Assembly Take Up Reel Assembly T Reel Gear 2 24 3 13 Brakes 2 25 3 13 1 S Brake Assembly T Brake Assem...

Page 7: ...P Head ACE Head Height Adjustment Azimuth Adjustment and Horizontal Position Adjustment 2 37 4 3 5 Checking After Adjustment 2 38 5 Test Points for Tape Path Adjustment 2 38 3 Electrical Adjustments 3 1 Servo Circuit Adjustment 3 1 3 1 1 Test Equipment and Standards Required 3 1 3 1 2 Location of Adjustment Points 3 1 3 1 3 Switching Position Adj 3 2 3 1 4 F Slow Tracking Confirm and Adj 3 2 4 Spa...

Page 8: ... 7 4 IC301 System Control Timer OSC Servo MPU Pin Function Table 7 4 CP 1 Board SY A 7 5 Servo Circuit Waveforms 7 6 Display FLD Grid Anode Assignment Drawing Table 7 6 TM 1 TM 2 Board 7 7 PW 1 Board 7 8 8 Board Layouts CP 1 Board 8 1 TM 1 Board 8 2 TM 2 Board 8 2 PW 1 Board 8 2 ...

Page 9: ...ble on the monitor screen removal of cabinet mechanism unit and main board circuit board locations etc Section 2 Mechanical Adjustments Describes the recommended periodic maintenance the cleaning procedure service tools disassembling the main parts of the mechanism and tape path adjustment Section 3 Electrical Adjustments Describes the electrical alignment for the maintenance of this unit Section ...

Page 10: ......

Page 11: ...the power supply being ALARM DATA Number of ALARM REC Total counts of ALARM n The data for the maintenance tables are memoried in E2 PROM and the memory can be kept if the timer micro computer is reset Maintenance table 2 As shown in Fig below Maintenance Table 2 ERROR is displayed on the screen When the MENU RESET button is pressed during display and resetting all data ERROR Dates and error codes...

Page 12: ...th the cassette inserted E12 The supply reel does the tape eject when tape unloading E13 The tape cannot be loaded with the cassette inserted E14 The tape cannot be loaded normally E15 The mechanism does not move to the correct position after tape loading E16 Mechanism position 3 cannot be used during intermittent recording Mechanism Mode Display Contents Mode No Mechanism mode Mode No Mechanism m...

Page 13: ...ving the locks of the clamps A using a screwdriver etc and slightly rotating the bottom part in the direction of the arrow m Electrical adjustments for the this model can be performed with only the cabinet removed When replacing the bottom cover do not tighten the screws 2 too much Excess tightness may damage the screws taps on the chassis Fig 1 1 1 2 2 2 2 2 Front Panel Clamps A Cabinet Main Unit...

Page 14: ...g the tray lock lever in the arrow direction to remove the lock as shown in the enlarge view A and by pushing the lid opener lever in the arrow direction to remove the lock as shown in the enlarge view B 6 Lift up the whole mechanism unit and main board CP 1 PWB assembly and as shown in Fig 1 1 3 push the two lock clamps D of the chassis in the arrow direction so that they can be removed from the ...

Page 15: ...porarily Setting Up and Connecting CP 1 PWB Assembly The following is an example of how to place and connect the main board without a jig when repairing the CP 1 PWB assembly 1 Place the mechanism unit and main board up side down as a whole on a flat surface with foil side of the main board facing up 2 Operete the unit using the buttons on TM 1 PWB and TM 2 PWB Fig 1 1 4 PW 1 PWB Screws CP 1 PWB A...

Page 16: ...Part description MnO2 Li lithium battery Part No 1 756 091 11 Replacement 1 Remove the cabinet and bottom cover Refer to Section 1 2 1 Removing the Cabinet Parts 2 Place the mechanism unit and CP 1 board up side down as a whole on a flat surface with foil side of the CP 1 board facing up Refer to Section 1 3 Tempo rarily Setting Up and Connecting CP 1 PWB Assem bly 3 Unsolder the leads of the batt...

Page 17: ...the following section should also be carried out without fail after carrying out any repairs to the set Note Oil and Grease Always use the specified brands of oil and grease If you use a grease with the wrong viscosity for example this can lead to all sorts of problems Be careful to keep the oil and grease free of dust and foreign bodies A drop of oil is the amount of oil remaining on the tip of a...

Page 18: ...brake assembly A 8325 366 A Brake T brake assembly A 8325 367 A system Capstan brake assembly A 8315 818 A T soft brake assembly 3 963 784 01 Loading motor assembly 3 961 047 01 Damper 3 961 049 01 Worm gear complete 3 961 048 02 Main cam 3 206 567 01 Special washer 3 6 x 0 5 3 973 491 01 Loading Wheel gear 1 3 961 050 01 drive Wheel gear 2 3 963 793 01 system Opt pinch relay gear 3 206 568 01 Cre...

Page 19: ... dial gauge VHJ 0004 Used to measure reel winding torque 7 Cassette torque meter VHJ 063S J 6082 011 A Used to measure back tension torque 8 Load lever assembly height J 6431 410 A Used to adjust the height of the load adjustment tool VHJ 0111 lever assembly 9 Torque gauge screwdriver VHJ 0014 J 6082 047 A Used to adjust the tightening torque of screws 10 3 mm dia bit for torque screwdriver J 6082...

Page 20: ...ipe vertically or use excessive force you can damage the video head 2 Tape Path System Reel Drive System Clean the pinch roller the capstan shaft the tape guides the FE head the ACE head the reel table the pulley and the reel belt with a soft cloth or chamois moistened with methyl alcohol n If the dirt on the tape guide cannot be cleaned off replace the tape guide Fig 1 2 2 Tape path surface Video...

Page 21: ... Mechanism 2 1 Names of the Main Parts 2 1 1 Cassette Mechanism Assembly Fig 2 1 1 Washer Special washer Stand L Tray lock spring Lid opener spring Release lever Pinion gear Gear holder Lock gear Drive gear Door opener lever Under frame ...

Page 22: ...ke up reel asswembly T soft brake assembly T brake assembly L guide act lever assembly Tape top sensor Load lever assembly Start rack gear Pinch cam gear Opener mounting Front rack gear Pinch lift mounting Pinch lift cam Capstan motor Pinch roller lever assembly Dew sensor Stopper lever assembly Audio R P head assembly ACE head Capstan brake assembly Cleaner lever Rotor Cylinder Drum Cleaner rolle...

Page 23: ...trol lever Main cam Clutch change lever Crescent slide Wheel gear 2 Wheel gear 1 Brake act lever assembly Reel pulley Friction gear assembly S brake act slide MC 1 PWB assembly BT spring lever assembly S load lever assembly T load lever assembly Crescent mounting S load gear T load gear Loading motor assembly Worm gear assembly ...

Page 24: ...witch is ON or OFF Horizontal shift section Vertical shift section IN REW R INITIAL 7 Cleaner roller assembly ON S T mounting incline assembly pressure begins S T mounting incline assembly pressure ends BRAKE pos 4 IDLER POS 2 Pinch roller OFF REVIEW 1 STILL SLOW 3 PLAY STOP REC 5 FF REW 6 6 2 0 7 0 1 0 1 0 2 0 3 0 5 0 4 0 6 CASSETTE OUT EJECT IN REW SHORT REW INITIAL POWER OFF When loading is car...

Page 25: ...s seen to be in FF REW mode 2 2 4 Self diagnosis Display Some models are equipped with the SELF DIAGNOSIS DISPLAYS function Use it as a means of finding out the symptoms and cause of the error before performing repairs For details refer to the separate service manual for the respective models Fig 2 2 2 T brake assembly S brake assembly T soft brake assembly S soft lever BT lever assembly BT spring...

Page 26: ...in sections 3 1 1 The above movements can also be performed with ou operating the loading motor by following the metho explained in Section 3 1 2 3 1 1 Operating the Loading Motor by the Manual Method 1 Refer to Section 3 2 and install the mechanism unit 2 Using your finger turn the loading motor located at the rear of the mechanism unit For EJECT turn the loading motor in the direction of the arr...

Page 27: ...on the cylinder drum and unplug the ACE FE head connectors 2 3 Unplug the flat cable from the stator 4 Unplug the dew sensor connector 4 5 Remove the four screws 5 then lift up the mecha nism unit The tray 6 will stop you removing the two screws 5 on the front so release the lock by pressing down the tray lock lever 7 and the lid opener lever 8 shown in Fig 3 2 2 then slide off the tray 6 Move the...

Page 28: ...ning torque of 5 kg cm Fig 3 3 1 3 3 2 Cassette Drive Gear 1 Refer to Section 3 3 1 and remove the cassette mecha nism assembly 2 Remove clamps 1 and 2 then remove the gear holder 3 3 Remove the clamp 1 then remove the pinion gear 4 4 Remove the clamp 2 then remove the lock gear 5 Assembly Notes 1 Put the tray in the EJECT mode position before fitting any parts 2 Apply grease VHJ 0100 to the gear ...

Page 29: ...nd L Fig 3 3 4 3 3 4 Start Rack Gear and Front Rack Gear 1 Remove the mechanism unit referring to Section 3 2 2 Remove the cassette mechanism assembly referring to Section 3 3 1 3 Remove the special screw 1 When you do this slide the front rack gear assembly 2 towards the front until it stops then take it off the shaft 3 Take care not to damage the shaft 3 4 Remove the spring 4 5 Remove the clamp ...

Page 30: ...nd take out the cleaner roller assembly 4 Be careful not to touch the sponge on the cleaner roller assembly 4 Assembly Notes 1 When mounting the cleaner lever 2 on the shaft 5 press the clamp 1 in the direction shown by the arrow and snap it into the mounting 6 on the audio R P head assembly Fig 3 4 1 5 Shaft 6 Mounting A Plastic spring 1 Clamp 2 Cleaner lever 3 Clamp B Plastic spring 4 Cleaner ro...

Page 31: ...adjust the position of the cylinder motor mounting 9 in the direction of the screw In this state hold the cylinder motor mounting 9 with the upper drum fitting tool VHJ 0112 and tighten the screw 8 with the hexagonal wrench 2 When attaching the rotor 7 the phase must be adjusted to that of the upper cylinder assembly 0 As shown in Fig 3 5 3 attach so that the hole a of the upper cylinder assembly ...

Page 32: ...r assembly 6 with the two dowels 7 on the cylinder mounting 4 See Fig 3 5 5 2 Apply grease VHJ 0100 to the rails of the cylinder mounting 4 grease the parts which come in contact with the S and T incline mounting assembly See Fig 3 5 5 3 Align the two dowels 8 on the cylinder mounting 4 with the two holes 9 on the mechanism chassis See Fig 3 5 4 4 After assembly clean the tape path surface of the ...

Page 33: ...p 6 on the cleaner roller assembly has snapped into the mounting of the audio R P head assembly ACE head 2 3 After assembly clean the surface of the head with a soft cloth or chamois 4 After assembly refer to Section 4 3 and adjust the head height the azimuth and the tracking X posi tion Fig 3 6 1 3 6 2 Full Erase Head 1 Unplug the connector from the full erase head 1 2 Remove the screw 2 and the ...

Page 34: ...embly clean the capstan shaft with a soft cloth or chamois Fig 3 7 1 Case 2 Normal FF REW model 1 Refer to Section 3 2 then remove the mechanism unit 2 Remove the screw 1 then remove the capstan mounting 2 3 Remove the reel belt 3 4 Remove the three screws 4 and the capstan motor 5 Assembly Notes 1 Check that connector 6 is inserted in the CP 1 PWB assembly 2 When fitting the three screws 4 use th...

Page 35: ... 4 Remove the worm gear assembly 5 To maintain performance do not dis assemble the worm gear assembly 5 Assembly Notes 1 Apply grease VHJ 0010 to the teeth of the worm gear assembly 5 Then apply grease VHJ 0114 to in the hole of the worm gear assembly 5 2 Check that the clamps 3 and 6 are securing the loading motor assembly 3 Check the polarity of the lead wires 2 the orange wire is the positive t...

Page 36: ...the pinch roller lever assembly 4 off the pinch lift mounting 2 Be fore you do this align the Indentation 5 on the pinch roller lever assembly 4 with the clamp 6 on the pinch lift mounting 2 Assembly Note 1 Be careful to keep the surface of the pinch roller free of dust and dirt Fig 3 9 1 2 Pinch lift mounting 3 Spring 4 Pinch roller lever assembly 1 Clamp 6 Clamp 5 Indentation ...

Page 37: ... the pinch cam gear 6 2 Check that the positioning mark 0 on the OPT pinch relay gear 9 is aligned with the arrow on the MC 1 PWB assembly as shown in Fig 3 9 3 Then align the square mark on the pinch cam gear 6 with the arrow on the MC 1 PWB assembly After that align the round hole on the pinch lift cam 5 with the indentation on the pinch cam gear 6 If you have carried out the above alignments an...

Page 38: ... 3 Remove the BT spring 1 and remove the sub BT spring 2 on the underside of mechanism chassis 4 Remove the clamp 3 on the underside of the mecha nism chassis then remove the BT lever assembly 4 5 Remove the clamp 5 on the band brake assembly 6 Then as shown in Fig A align the other end of the band brake assembly with the protruding parts of the BT lever assembly 4 before removing it Assembly Note...

Page 39: ...Be careful not to get any grease on the reel belt 1 Fig 3 12 1 3 12 2 Clutch Mounting Assembly 1 Refer to Section 3 3 1 and remove the cassette mecha nism assembly 2 Refer to Section 3 12 1 and remove the reel pulley 3 Remove the two screws 1 then remove the clutch mounting assembly 2 Assembly Notes 1 Align the two holes 3 with the shafts 4 and 5 Be careful not to press part A of the clutch mounti...

Page 40: ...bly 4 Fig 3 12 3 3 12 4 T Soft Brake Assembly Take Up Reel Assembly T Reel Gear 1 Remove the T soft spring 1 2 Remove the clamp 2 then remove the T soft brake assembly 3 3 Refer to Section 3 12 2 and remove the clutch mount ing assembly 4 Pressing the T brake assembly 4 in the direction of the arrow remove the take up reel assembly 5 washer 6 and the T reel gear 7 Assembly Note 1 After cleaning th...

Page 41: ...ar 1 2 5 Remove the clutch change spring 3 6 Remove the clamps 4 and 5 then remove the brake control lever 6 Remove the clamp 4 on the topside of the mechanism chassis 7 Remove the brake return spring 7 8 Refer to Section 3 8 and remove the worm gear assembly 9 Remove the clamp 8 and clamp 5 then remove the brake act lever assembly 9 To maintain the perfor mance of the brake act lever assembly 9 d...

Page 42: ... shaft 5 shown in Fig 3 13 3 and to the BT spring lever assembly 3 and the S brake act slide 1 shown in Fig 3 13 4 2 After mounting the BT spring lever assembly 3 on the Shaft 5 hook the BT spring onto the clamp 6 and press it until it touches the pin 7 3 Make sure that the clamps 8 9 and 0 have snapped into the S brake act slide 1 Align the arrow on the S brake act slide 1 with the arrow on the m...

Page 43: ... direction When tape unloading begins watch out in case the S and T incline mounting assemblies 1 and 3 get caught in the rail 3 After replacing the parts clean the cylinder and the roller guide then adjust the tape path as described in Section 4 3 Fig 3 14 2 3 14 Guides 3 14 1 Guide Roller Assembly 1 Unscrew the two screws 1 When you do this be careful not to damage the cylinder or the video head...

Page 44: ... to Section 3 9 2 and check the positioning of the OPT pinch relay gear the pinch cam gear and the pinch lift cam 3 Align the hole in the crescent slide with the hole in the mechanism chassis as shown at point C in Fig 3 15 2 refer to Section 3 16 and see the holes 6 and 7 in Fig 3 16 1 4 When fitting the main cam 4 position the OPT pinch relay gear 6 and the front rack gear as shown at points D a...

Page 45: ...g 3 16 1 and to the crescent slide 4 shown in Fig 3 16 2 2 Before fitting the crescent slide 4 refer to Section 3 13 3 and align the arrow on the S brake act slide with the arrow on the mechanism chassis Then refer to Fig 3 17 3 and check that the S load gear and the T load gear have completed tape unloading 3 When assembling the parts raise the right side of the crescent slide 4 slightly and keep...

Page 46: ...ly grease VHJ 0100 to the shafts 8 9 and parts A shown in Fig 3 17 1 Then apply grease VHJ 0100 to the parts shown in Fig 3 17 2 2 When fitting the S load gear 2 and the T load gear 5 align them in the tape loaded state as shown in Fig A in Fig 3 17 3 Again after completing tape unloading on these gears check that they are positioned as shown in Fig B in Fig 3 17 3 then refer to Section 3 14 2 and...

Page 47: ...o so that they do not protrude above the top of their holders 2 Do the soldering quickly Fig 3 18 1 3 18 2 Reel Sensor 1 Refer to Sections 3 12 2 and 3 12 4 then remove the clutch mounting assembly the T soft brake assembly and the take up reel assembly 2 Refer to Section 3 13 2 then remove the wheel gear 2 the wheel gear 1 and the brake control lever 3 Remove the soldering from the MC 1 PWB assem...

Page 48: ...then remove the EP switch lever 3 Assembly Notes 1 Apply grease VHJ 0100 to the protrusion 4 on the back of the EP switch lever 3 2 After fitting the cassette mechanism assembly check that in EJECT mode the EP switch lever 3 does not touch the EP switch 5 Fig 3 18 3 1 EP switch spring 3 EP switch lever 5 EP switch 2 Clamp 4 Protrusion on back apply grease here ...

Page 49: ...que value of the reel table on the supply side It should be at least 600 g cm Take the measurement with the torque dial gauge VHJ 0004 held in position in your hand lock torque While taking the measurement rotate the reel table take up reel assembly on the take up side with your hand so that the reel sensor does not respond 3 After switching to FF mode wait for at least 10 seconds and then measure...

Page 50: ...heck that the back tension torque is between 30 and 50g cm 4 3 Tape Path Adjustment In normal circumstances the tape path system does not need to be adjusted However after removing or replacing one of the parts shown in Fig 4 3 1 you should check and adjust the tape path The adjustment of the tape path is carried out while monitoring the envelope waveform of the video head output using an oscillos...

Page 51: ...Lever Assembly Height Adjustment 1 Refer to Sections 3 9 2 and remove the opener mounting 2 Position the height adjustment tool VHJ 0111 3 under the full surface of the protrusion 2 on the load lever assembly 1 as shown in Fig 4 3 2 3 Using your fingers gently screw the adjustment nut 4 clockwise into the nut box VHJ 0048 5 until the protrusion 2 of the load lever assembly 1 touches the height adj...

Page 52: ...ppear but sinks into the flat part as shown in Fig 4 3 4 d If this happens the status shown in Fig 4 3 4 c is normal so loosen the S guide roller then tighten it again until the envelope waveform is as shown in Fig 4 3 4 c 2 Check that at the tracking centre the output of the front half of the envelope waveform is not less than 80 of the maximum 3 Rotate the S guide roller 20 d counterclockwise 3 ...

Page 53: ...veform actual azimuth adjustment Fig 4 3 5 2 Horizontal position adjustment 1 Play the alignment tape VHJ 0009 2 Press the tracking buttons tracking and tracking _ simultaneously and set the tracking to the centre 3 Using an oscilloscope observe the waveform of the video head output 4 Loosen the two fixed screws on the audio R P head ACE head by between 20 d and 30 d anticlockwise 5 Using a slotte...

Page 54: ...ck that the envelope waveform is activated immediately when you switch from PLAY to REV or from REV to PLAY Check that there is no slack in the tape next to the pinch roller 4 Check that the envelope waveform is activated immediately when you switch to PLAY from FF REW CUE REV or STOP mode Check that there is no slack in the tape next to the pinch roller 5 Check that the tape is not curling or rid...

Page 55: ...st playback As this will deviate the tracking center set be sure to tracking center position after starting playback to prevent auto tracking from being set 3 1 1 Test Equipment and Standards Required Color Bar Signal Generator PAL color bar signal with 100 white level Oscilloscope Vertical sensitivity 5 mV DIV external trigger Bandwidth more than 10 MHz Alignment Tape VHJ 0009 SP mode monoscope 6...

Page 56: ...Measuring Equipment Adj Condition Picture of Color bar generator Self recording monitor TV Monoscope pattern 3 H mode PLAY signal Monitor TV mode Blank tape Adj Location Adj Value REC button TRACKING buttons EJECT button 1 Insert blank VHS cassette tape and record monoscope pattern on the 3 H mode 2 Play back the self recorded tape and then set the VCR in the STILL mode 3 Change to F Slow play bac...

Page 57: ...iffer from those used for the unit These are because of parts common ality and improvement Parts list has the present standardized repair parts 3 Stock of Parts Parts marked with o at SP Supply Code column of the spare parts list may not be stocked Therefore the delivery date will be delayed 4 Harness Harnesses with no part number are not registered as spare parts In need of repair get components ...

Page 58: ...CUIT BOARD CP A 4 A 8344 348 A s MOUNTED CIRCUIT BOARD TM 2 5 A 8345 241 A s MOUNTED CIRCUIT BOARD TM 1 6 1 251 828 11 s SOCKET AC INLET 7 1 518 833 11 s INDICATOR TUBE 8 3 203 300 01 s COVER BOTTOM 9 3 203 326 01 s DOOR CASSETTE 10 3 206 683 01 s SPACER OPT CAM 11 3 740 330 01 s LOCK 12 3 740 382 01 s SCREW 4X12 13 3 940 396 01 o PLATE SPRING 14 3 946 542 01 o HOLDER 4 2 Exploded Views No Part No...

Page 59: ...E 102 3 202 102 01 s WASHER F 103 3 735 759 01 s WASHER 3 PLA 104 3 960 915 01 s LEVER DOOR OPENER 105 3 960 916 01 o HOLDER GEAR 106 3 960 939 01 s SCREW 2 6X6 SPECIAL 107 3 960 952 01 o STAND L 108 3 960 954 01 s FRAME LOWER 109 3 960 959 01 s GEAR LOCK 110 3 960 960 01 s GEAR PINION 111 3 961 301 01 s SPRING LID OPENER 112 3 961 302 01 s LEVER RELEASE 113 3 961 303 01 s SPRING TRAY LOCK ...

Page 60: ...06 3 193 651 01 s SPRING BT SUB TL 207 3 193 669 01 s HEAD ERASE FULL 208 3 735 630 01 s ROLLER ASSY GUIDE 209 3 735 754 01 s WASHER ADJ PLA 210 3 735 760 01 s WASHER SPECIAL 3 PLA No Part No SP Description 211 3 960 927 01 s GEAR S REEL 212 3 960 984 01 s SCREW 2 6X10 SPECIAL 213 3 961 002 01 s LEVER S SOFT 214 3 961 003 01 s SPRING S SOFT 215 3 961 016 01 s LEVER ASSY BT 216 3 961 037 01 s MOUNT...

Page 61: ...ING BRAKE 90 308 3 206 563 01 s SCREW 4X6 309 3 207 042 01 s CYLINDER UPR 310 3 206 565 01 s MOUNT MOTOR CYLINDER 311 3 206 679 01 s GROUND CYLINDER CHIP 312 3 206 680 01 s SPRING CYLINDER GROUND No Part No SP Description 313 3 206 681 01 s MOTOR CYL DC2W ROTOR 314 3 206 682 01 s MOTOR CYLDC2WVN STARTER 315 3 686 999 01 s SCREW B 2 6X4 ZNBK CM2 ST 316 3 746 760 01 s SCREW 2 3X6 SPECIAL 317 3 948 6...

Page 62: ...13 3 203 303 01 s GEAR PINCH CAM JG 414 3 203 304 01 s MOUNTING OPENER JG 415 3 204 110 01 s MOUNT ASSY LIFT JG 416 3 735 630 01 s ROLLER ASSY GUIDE 417 3 735 760 01 s WASHER SPECIAL 3 PLA 418 3 961 001 01 s SPRING T SOFT 419 3 961 008 01 s SLIDE T ACT BRAKE 420 3 961 021 01 s SCREW 2 6X6 SPECIAL No Part No SP Description 421 3 961 024 01 s LEVER ASSY PINCH ROLLER 422 3 961 026 01 s SPRING PINCH R...

Page 63: ...1 01 s SCREW 2 6X6 SPECIAL 512 3 960 929 01 s BELT REEL RBR 513 3 960 995 01 s GEAR S ROAD 514 3 960 996 01 s SPRING S ROAD 515 3 960 997 01 s LEVER ASSY S ROAD 516 3 960 998 01 s GEAR T ROAD No Part No SP Description 517 3 961 007 01 s SLIDE S ACT BRAKE 518 3 961 011 01 s SPRING BRAKE RETURN 519 3 961 012 01 s LEVER CLUTCH CHANGE 520 3 961 013 01 s SPRING CLUTCH CHANGE 521 3 961 032 01 s SCREW 2 ...

Page 64: ...5V C3031 1 165 929 11 s CAPACITOR CERAMIC 0 068MF25V C3032 1 162 921 11 s CAPACITOR CERAMIC 33PF 50V CH C3033 1 162 921 11 s CAPACITOR CERAMIC 33PF 50V CH C3034 1 162 921 11 s CAPACITOR CERAMIC 33PF 50V CH C3035 1 162 924 11 s CAPACITOR CERAMIC 56PF 50V CH C3036 1 162 924 11 s CAPACITOR CERAMIC 56PF 50V CH C3037 1 162 924 11 s CAPACITOR CERAMIC 56PF 50V CH C3038 1 126 916 11 s CAPACITOR ELECT 1000...

Page 65: ... 540 11 s INDUCTOR 1 1UH L3010 1 414 540 11 s INDUCTOR 1 1UH L3011 1 414 540 11 s INDUCTOR 1 1UH L3012 1 414 540 11 s INDUCTOR 1 1UH PC301 1 804 661 11 s PHOTO COUPLER GPIS094HCZ PC302 1 804 661 11 s PHOTO COUPLER GPIS094HCZ PC303 1 804 661 11 s PHOTO COUPLER GPIS094HCZ Q3001 8 729 205 97 s TRANSISTOR 2SC3668 Y Q3002 8 729 205 97 s TRANSISTOR 2SC3668 Y Q3005 8 729 205 97 s TRANSISTOR 2SC3668 Y Q30...

Page 66: ...16 829 11 s RESISTOR CHIP 4 7K 1 10W 1608 R3114 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3115 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3116 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3117 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3118 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3119 1 216 833 11 s RESISTOR CHIP 10K 1 10W 1608 R3120 1 216 829 11 s RESISTOR CHIP 4 7K 1 10W 1608 R3121 1...

Page 67: ...10MF 16V C1213 1 165 931 11 s CAPACITOR CERAMIC 0 01MF 50V C1221 1 162 916 11 s CAPACITOR CERAMIC 12PF 50V CH VA A BOARD Ref No or Q ty Part No SP Description C1222 1 162 916 11 s CAPACITOR CERAMIC 12PF 50V CH C1223 1 162 923 11 s CAPACITOR CERAMIC 47PF 50V CH C1224 1 162 923 11 s CAPACITOR CERAMIC 47PF 50V CH C1225 1 162 927 11 s CAPACITOR CERAMIC 100PF 50V CH C1226 1 162 927 11 s CAPACITOR CERAM...

Page 68: ...41 s MICRO INDUCTOR 56UH VA A BOARD Ref No or Q ty Part No SP Description L1253 1 410 518 41 s MICRO INDUCTOR 56UH L1601 1 410 509 11 s MICRO INDUCTOR 10UH L1615 1 410 525 11 s MICRO INDUCTOR 220UH L1617 1 410 518 41 s MICRO INDUCTOR 56UH L1801 1 414 540 11 s INDUCTOR 1 1UH L2071 1 410 521 11 s MICRO INDUCTOR 100UH Q1001 8 729 101 25 s TRANSISTOR 2SC1009A Q1003 8 729 901 81 s TRANSISTOR 2SC2412K T...

Page 69: ...ON 560 1 4W SMALL R1204 1 216 829 11 s RESISTOR CHIP 4 7K 1 10W 1608 VA A BOARD Ref No or Q ty Part No SP Description R1205 1 216 821 11 s RESISTOR CHIP 1 0K 1 10W 1608 R1209 1 216 829 11 s RESISTOR CHIP 4 7K 1 10W 1608 R1210 1 216 843 11 s RESISTOR CHIP 68K 1 10W 1608 R1211 1 218 285 11 s RESISTOR CHIP 75 1 16W 1608 R1212 1 245 301 11 s RESISTOR CHIP 56K R1213 1 216 832 11 s RESISTOR CHIP 8 2K 1 ...

Page 70: ... 1608 R2046 1 218 867 11 s RESISTOR CHIP 6 8K 1 10W 1608 R2048 1 216 827 11 s RESISTOR CHIP 3 3K 1 10W 1608 R2071 1 216 837 11 s RESISTOR CHIP 22K 1 16W 1608 R2072 1 249 381 11 s RES CARBON 1 1 4W R2073 1 216 826 11 s RESISTOR CHIP 2 7K 1 10W 1608 R2074 1 249 401 11 s RES CARBON 47 1 4W SMALL R2075 1 216 818 11 s RESISTOR CHIP 560 1 10W 1608 R2076 1 216 825 11 s RESISTOR CHIP 2 2K 1 10W 1608 R2077...

Page 71: ... 1 533 611 11 s PROTECTOR IC 1 0A 50V PR512 1 533 611 11 s PROTECTOR IC 1 0A 50V PW 1 BOARD Ref No or Q ty Part No SP Description Q5002 1 809 602 11 s TRANSISTOR 2SC2274 F AA Q5003 8 729 140 97 s TRANSISTOR 2SB734 34 Q5004 1 809 602 11 s TRANSISTOR 2SC2274 F AA Q5010 8 729 027 98 s TRANSISTOR 2SK1460LS Q5110 1 805 060 11 s TRANSISTOR 143 EK Q5111 8 729 027 43 s TRANSISTOR DTC114EKA T146 Q5140 1 80...

Page 72: ...ON 68K 1 4W SMALL R7116 1 249 439 11 s RESISTOR CARBON 68K 1 4W SMALL R7117 1 249 439 11 s RESISTOR CARBON 68K 1 4W SMALL R7118 1 249 439 11 s RESISTOR CARBON 68K 1 4W SMALL R7120 1 249 425 11 s RESISTOR CARBON 4 7K 1 4W R7121 1 249 425 11 s RESISTOR CARBON 4 7K 1 4W R7122 1 249 439 11 s RESISTOR CARBON 68K 1 4W SMALL R7123 1 249 439 11 s RESISTOR CARBON 68K 1 4W SMALL R7124 1 249 439 11 s RESISTO...

Page 73: ...5 6ES B2 RD6 2ES B2 1SS133T 77 1SS244 T 77 1SS83 ERC91 2 GMA01U BT PN263L NC CATHODE ANODE ANODE CATHODE ANODE CATHODE SEL2910D D SEL2910D TP2 D SEL2410GM LN59L TRANSISTOR E C B B E C E C B E B C E B C 2SC2274 F AA 2SD734E 2SD734 E 2SC3331 S AA 2SB734 34 DTC114EF DTC114EL TL2 2SC1009A 2SC2814 F4 TB E B C LETTER SIDE E C B E C B GND IN OUT 143 EK 2SA1318 S 2SD2396 H DTC114EKA T146 2SA1037AK T146 QR...

Page 74: ... Other 1 TOPVIEW 1 TOPVIEW 1 TOPVIEW 1 L5431 AA LA71582M MPB LB1643L LC74781 9832 MN12510F MN1381 R PST9128NR UPD78F4928GF P27 3BA TC4S30F TC4S81F BR24C08 LA6458D UPD4053BC CXA1203M LA7116 OTHER GPIS094HCZ PC123U2 SG 105F ...

Page 75: ...6 1 SVT N72P E 6 1 Overall Overall Overall Wiring Section 6 Block Diagrams ...

Page 76: ...6 2 SVT N72P E 6 2 MC 1 MH MC MC 5 DEW SENSOR Mechanism Connection Mechanism Connection Mechanism Connection ...

Page 77: ...6 3 SVT N72P E 6 3 IC101 Audio Circuit Audio Circuit Audio Circuit ...

Page 78: ...6 4 SVT N72P E 6 4 IC161 IC101 IC121 Video Circuit Video Circuit Video Circuit ...

Page 79: ...SVT N72P E 6 5 IC301 1 2 MPU SYSTEM CONTROL TIMER TUNING CONTROL IC306 IC305 IC301 IC302 IC303 IC711 IC309 IC304 IC308 System Control Servo Circuit System Control Servo Circuit System Control Servo Circuit ...

Page 80: ...SVT N72P E 2 3 4 5 A B C D E F G H 1 CP 1 VA A CP 1 VA A CP 1 Board VA A Video Audio Section 7 Schematic Diagrams 7 1 7 1 ...

Page 81: ...SVT N72P E 2 3 4 5 1 I J K L M N O P CP 1 VA A CP 1 VA A 7 2 7 2 ...

Page 82: ... r o t o m n a t s p a C 5 4 T U O C E R O H t u p t u o l a n g i s g n i t a c i d n i e d o m g n i d r o c e R 6 4 T U O D N E E P A T O H t u p t u o l a n g i s l o r t n o c d n e e p a T 7 4 T U O G N I N R A W O H t u p t u o g n i n r a W 8 4 T U O M R A L A O H Alarm signal output 9 4 P U R E W O P O H f f o s i r e w o p e h t t p e c x e t u p t u o H 0 5 H C E R O H e d o m g n i d r...

Page 83: ...SVT N72P E 2 3 4 5 1 A B C D E F G H CP 1 SY A CP 1 SY A CP 1 Board SY A System Control Servo 7 4 7 4 ...

Page 84: ...G 7G 8G 9G col col 1a 1a 2a 2a 2a 2a 2a 2a 2a 2d 2g 1a 1b 1b 1g 1g 1g 1g 1c 1c 1d 1d 1d 1a 1a 1a 1d 1e 1e 1 h 1 b 1 b 1 f 1 f 2 b 2 c 2 e 2 f 1 e 1 e 1 c 1 c 1 h 1f 1f 1h 1h 1h GR 05000 RE4QM EXSY R L WAVEFORM TEST POINT LOCATION WAVEFORM TEST POINT LOCATION IC301 PIN 9 10 REC 2V div 20us div IC301 PIN 85 REC 2V div 10ms div IC301 PIN 93 REC 2V div 200us div WF S EC4Q IC301 PIN 96 REC 100mV div 10...

Page 85: ...SVT N72P E 2 3 4 5 1 A B C D E F G H TM 1 TM 2 TM 1 TM 2 TM 1 TM 2 Board Display Key Scan 7 6 7 6 ...

Page 86: ...SVT N72P E 2 3 4 5 A B C D E F G H 1 PW 1 PW 1 PW 1 PW 1 Board Power Supply 7 7 7 7 ...

Page 87: ...OUT TIMER EJECT OUT SW OUT R3160 R3154 R3156 R3157 R3155 R3159 R3161 J3199 J3200 R3158 R3169 L3012 L3004 L3005 L3006 L3007 L3008 L3009 L3010 J3285 J3284 J3283 J3282 J3286 J3287 J3288 L3011 J3289 J3290 C3149 J3185 J3184 R3148 JW JW JW LUG Y3005 IC101 R1211 J1202 J1201 R1201 C1236 Q1201 R1210 R1212 Q1214 Q1210 R1214 Q1211 R1213 C1212 Q1212 R1218 R1217 R1216 R1215 Q1213 R1231 C1234 C1221 C1222 C1223 ...

Page 88: ... A7101 S7120 D7151 D7152 D7150 R7130 J7117 R7106 R7107 R7108 R7109 R7131 D7146 D7147 D7148 D7149 D7141 D7143 D7142 D7139 D7132 D7133 D7144 D7145 D7140 D7136 D7137 Q7130 D7138 J7135 D7102 D7101 D7103 D7116 D7115 D7114 J7131 J7132 J7130 J7129 J7133 J7134 J7136 C7106 J7137 S7107 S7108 S7106 POWER MENU RESET ALL CLEAR J7138 J7139 J7140 J7141 J7142 J7146 J7145 J7144 J7143 TIMER J7147 D7109 J7149 S7104 ...

Page 89: ......

Page 90: ...Printed in Japan Sony Corporation 2002 8 08 B P Company 2002 SVT N72P CE E 9 955 388 01 ...

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