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Sanyo SRT-4040 Basic Service Technical Information

Time lapse/real time video cassette recorder mechanism
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Download this manual See also: Service Manual, Instruction Manual
BASIC SERVICE TECHNICAL
INFORMATION
Time Lapse/Real Time
Video Cassette Recorder
Contents
MAINTENANCE ITEMS .................. 2
.......................................................... 3
MECHANISM MODES .................... 6
MOVE ............................................... 8
3-2. MECHANISM UNIT ......................... 9
ASSEMBLY .................................... 11
3-5. CYLINDER (DRUM) ....................... 12
VP-R/N MECHANISM
3-7. CAPSTAN MOTOR ....................... 15
MECHANISM ................................ 16
3-11. BT LEVER ASSEMBLY ................. 18
3-13. BRAKES ......................................... 20
3-14. GUIDES .......................................... 22
OPT PINCH RELAY GEAR ............ 23
3-16. CRESCENT SLIDE ......................... 24
AND EP SW LEVER ...................... 26
FILE NO.
VP-R/VP-N
MECHANISM
ADJUSTMENTS
TORQUE IN PLAY MODE ............. 27
REFERENCE No.MM5310380

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Summary of Contents for Sanyo SRT-4040

  • Page 1: Table Of Contents

    BASIC SERVICE TECHNICAL INFORMATION Time Lapse/Real Time Video Cassette Recorder Contents 1. MAINTAINING AND CHECKING THE MECHANISM 1-1. REGULAR CHECKS AND MAINTENANCE ITEMS ... 2 1-2. SERVICE TOOLS AND CLEANING ... 3 2. AN OVERVIEW OF THE MECHANISM 2-1. NAMES OF THE MAIN PARTS ... 4 2-2.

  • Page 2: Maintaining And Checking The Mechanism

    1. MAINTAINING AND CHECKING THE MECHANISM 1-1. REGULAR CHECKS AND MAINTENANCE ITEMS To obtain full function and maximum performance from the set, and to stop it getting dirty or scratched, we recommend that you carry out the following mainte- nance procedures and regular checks. The maintenance checks described in the following section should also be carried out without fail after carrying out any repairs to the set.

  • Page 3: Service Tools And Cleaning

    1-2-1. SERVICE TOOLS NOTES ON ALIGNMENT TAPES Select a PAL or NTSC alignment tape from the list below, according to the transmission system of the VCR you are repairing. PAL: For models with 625 scanning lines and a field frequency of 50Hz...

  • Page 4: An Overview Of The Mechanism

    1-2-2. CLEANING 1. Cylinder (Drum) (See Fig.1-2-2) Moisten a chamois with methyl alcohol and clean the video head and the tape path surface of the cylinder. Be sure to wipe horizontally in relation to the video head. If you wipe vertically, or use excessive force, you can damage the video head.
  • Page 5 2-1-2. TOPVIEW Fig. 2-1-2 2-1-3. UNDERSIDE Fig. 2-1-3 –5–...

  • Page 6: An Overview Of The Mechanism Modes

    2-2. AN OVERVIEW OF THE MECHANISM MODES 2-2-1. MECHANISM MODE SWITCHING TABLE NOTE : The letters and figures enclosed in circles in the mechanism mode column are the codes on the crescent slide. MODE SWITCH OUTPUT TABLE HEX DATA SW DATA 2 SW DATA 1 H: 5V L: 0V...
  • Page 7 2-2-2. MOVEMENT CHECK LIST FOR THE MAIN PARTS OF THE MECHANISM Mechanism mode Principal parts T brake assembly S brake assembly T soft brake assembly S soft lever BT lever assembly BT spring Pinch roller lever assembly Clutch mounting assembly Load lever assembly Capstan brake assembly S and T incline mounting assembly...

  • Page 8: Disassembling The Main Parts Of The Mechanism

    3. DISASSEMBLING THE MAIN PARTS OF THE MECHANISM POINTS TO NOTE • When fitting the parts of the mechanism, refer to the "Assembly Notes", and proceed in the reverse of dis- assembly order. • Dis-assembly and assembly should be carried out in EJECT mode unless a movement mode is explicitly specified.

  • Page 9: Mechanism Unit

    PLAY direction. 3-3. CASSETTE DRIVE MECHANISM 3-3-1.CASSETTE MECHANISM ASSEMBLY (See Figs.3-3-1 and 3-3-2) 1) Put the VCR into EJECT mode. 2) Remove the two screws 3) Lift up the back of the cassette mechanism assembly slightly, and remove the two hooks ASSEMBLY NOTES: 1.
  • Page 10 3-3-2. CASSETTE DRIVE GEAR (See Fig.3-3-3) 1) Refer to section 3-3-1 and remove the cassette mecha- nism assembly. 2) Remove clamps , then remove the gear holder 3) Remove the clamp , then remove the pinion gear 4) Remove the clamp , then remove the lock gear ASSEMBLY NOTES: 1.

  • Page 11: Cleaner Roller Assembly

    3-3-4.START RACK GEAR AND FRONT RACK GEAR (See Figs.3-3-5 and 3-3-6) 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 . When you do this, slide the front rack gear assembly it stops, then take it off the shaft damage the shaft...

  • Page 12: Cylinder (Drum)

    3-5. CYLINDER (DRUM) (See Fig. 3-5-1 to 3-5-3) 3-5-1.CYLINDER (DRUM) MOTOR, UPPER CYLINDER ASSEMBLY 1) Disconnect the flexible cable stator 2) Remove the two screws , and remove the stator and spring In this state, the cylinder earth chip top and bottom of the mechanism unit are reversed. Note: Cylinder earth chip removing the cylinder motor mounting step 4).
  • Page 13 3-5-2. CYLINDER MOUNTING (See Figs. 3-5-4 and 3-5-5) 1) Put the mechanism into EJECT mode. 2) Refer to section 3-4 and remove the cleaner lever. 3) Disconnect the flexible cable connected to the stator 4) Disconnect the flexible cable connected to the connector 5) Remove the three screws .

  • Page 14: Fe Head And Ace Head

    3-6. FE HEAD AND ACE HEAD 3-6-1. AUDIO R/P HEAD ASSEMBLY (ACE HEAD) (See Fig.3-6-1) 1) Unplug the connector from the audio R/P head assembly (ACE head). 2) Remove the two screws , then remove the audio R/ P head assembly (ACE head) ASSEMBLY NOTES: 1.

  • Page 15: Capstan Motor

    3-7. CAPSTAN MOTOR 3-7-1. CAPSTAN MOTOR [Case 1. High speed FF/REW model] (See Fig. 3-7-1) 1) Refer to section 3-2, then remove the mechanism unit. 2) Remove the reel belt 3) Remove the three screws and the capstan motor 4) Remove the heat transfer spacer motor or mechanism chassis.

  • Page 16: Loading Motor Assembly And Worm Gear Assembly

    3-8. LOADING MOTOR ASSEMBLY AND WORM GEAR ASSEMBLY (See Fig.3-8-1) 1) Refer to section 3-2 and remove the mechanism unit. 2) Remove the soldering on the lead wires loading motor assembly from the MC-1 PWB as- sembly. When you do this, be careful not to let the soldering iron touch any other parts.
  • Page 17 3-9-2.PINCH LIFT CAM AND PINCH CAM GEAR (See Figs.3-9-2 and 3-9-3) 1) Refer to section 3-2 and remove the mechanism unit. When you do this, make sure the mechanism is in EJECT mode. 2) Refer to section 3-9-1 and remove the pinch roller lever assembly.

  • Page 18: L Guide Act Lever Assembly, Load Lever Assembly And Stopper Lever Assembly

    3-10. L GUIDE ACT LEVER ASSEMBLY, LOAD LEVER ASSEMBLY AND STOPPER LEVER ASSEMBLY (See Fig.3-10-1) 1) Refer to section 3-3 and remove the cassette mecha- nism assembly. 2) Refer to sections 3-9-1 and 3-9-2 ,then remove the pinch roller lever assembly and the opener mount- ing.

  • Page 19: Reel Drive Mechanism

    3-12. REEL DRIVE MECHANISM 3-12-1.REEL BELT, REEL PULLEY, FRICTION GEAR ASSEMBLY AND CLUTCH CHANGE LEVER (See Fig.3-12-1) Refer to section 3-2 and remove the mechanism unit. Remove the reel belt from the reel pulley Take off the washer and remove the reel pulley Take off the washer and remove the friction gear assembly...

  • Page 20: Brakes

    3-12-4.T SOFT BRAKE ASSEMBLY, TAKE UP REEL ASSEMBLY, T REEL GEAR (See Fig.3-12-4) 1) Remove the T soft spring 2) Remove the clamp , then remove the T soft brake assembly 3) Refer to section 3-12-2 and remove the clutch mount- ing assembly.
  • Page 21 3-13-2.BRAKE CONTROL LEVER AND BRAKE ACT LEVER ASSEMBLY (See Fig.3-13-2) 1) Refer to section 3-2 and remove the mechanism unit. 2) Refer to section 3-15 and remove the wheel gear 2. 3) Refer to sections 3-12-1, then remove the reel belt and the reel pulley.

  • Page 22: Guides

    3-14. GUIDES 3-14-1. GUIDE ROLLER ASSEMBLY (See Fig.3-14-1) 1) Unscrew the two screws . When you do this, be careful not to damage the cylinder or the video head. 2) Remove the two guide roller assemblies screwing them counterclockwise. ASSEMBLY NOTES: 1.

  • Page 23: Wheel Gear 2, Main Cam And Opt Pinch Relay Gear

    3-15. WHEEL GEAR 2, MAIN CAM AND OPT PINCH RELAY GEAR (See Figs.3-15-1 and 3-15-2) 1) Refer to section 3-2 and remove the mechanism unit. When you do this, make sure the mechanism is in EJECT mode. 2) Remove the clamp , then remove the wheel gear 2 3) Remove the washer , then remove the main cam...

  • Page 24: Crescent Slide

    3-16. CRESCENT SLIDE (See Figs.3-16-1 and 3-16-2) 1) Refer to section 3-2 and remove the mechanism unit. When you do this, make sure the mechanism is in EJECT mode. 2) Refer to section 3-3-1 and remove the cassette mecha- nism assembly. 3) Refer to section 3-7-2 and remove the capstan brake assembly.

  • Page 25: S Load Gear, T Load Gear, S Load Lever Assembly Andt Load Lever Assembly

    3-17. S LOAD GEAR, T LOAD GEAR, S LOAD LEVER ASSEMBLY AND T LOAD LEVER ASSEMBLY (See Figs.3-17-1, 3-17-2 and 3-17-3) 1) Refer to section 3-16 and remove the crescent slide. 2) Refer to section 3-14-2 and remove the S and T incline mounting assemblies.

  • Page 26: Tape Sensors, Reel Sensor And Ep Sw Lever

    3-18. TAPE SENSORS, REEL SENSOR AND EP SW LEVER 3-18-1 TAPE TOP SENSOR AND TAPE END SENSOR (See Fig.3-18-1) 1) Refer to section 3-2 and remove the mechanism unit. 2) Refer to section 3-3-1 and remove the cassette mechanism assembly. 3) Remove the soldering from the MC-1 PWB assembly, then remove the photo diodes .

  • Page 27: Reel Table Torque Check

    4. MECHANISM CHECKS AND ADJUSTMENTS 4-1. REEL TABLE TORQUE CHECK 1)With the power switch turned OFF, stick black vinyl tape over the photo diodes of the tape sensors. Then turn the power switch ON. Front loading will begin. Refer to section 3-2 and Fig.3-2-2, and release the locks of the tray lock lever and the lid opener lever.

  • Page 28: Tape Path Adjustment

    4-3-1. ADJUSTMENT PROCEDURE 1. Select a PAL or NTSC alignment tape or blank cas- sette tape, according to the transmission system of the VCR you are repairing. NTSC: For models with 525 scanning lines and a field frequency of 60Hz...
  • Page 29 4-3-3.GUIDE ROLLER HEIGHT ADJUSTMENT (See Figs.4-3-3 and 4-3-4) 1) Playback the Alignment Tape (NTSC: VHJ-0006, PAL: VHJ-0009) and check that the envelope waveform is at its maximum at the tracking centre. Then, after loosening the S guide roller and the T guide roller by rotating them counterclockwise, tighten them in turn until the envelope waveform becomes flat.
  • Page 30 4-3-4. AUDIO R/P HEAD (ACE HEAD) HEIGHT ADJUSTMENT, AZIMUTH ADJUSTMENT AND HORIZONTAL POSITION ADJUSTMENT (1) Hight/azimuth adjustment (See Fig.4-3-5) 1) Refer to section 4-3-3, complete the GUIDE ROLLER adjustment, and perform the AUDIO R/P HEAD ad- justment. As the audio R/P head assembly (ACE HEAD) has been temporarily adjusted before shipment, do not rotate screws unnecessarily.
  • Page 31 4-3-5.CHECKING AFTER ADJUSTMENT 1) Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ- 0009) and check that the envelope waveform is acti- vated immediately and that there are no fluctuations in the envelope waveform or the audio output wave- form. 2) Load a cassette tape (NTSC: T-120, PAL: E-180) and use it to record and replay.
  • Page 32 SANYO Electric Co., Ltd. Osaka, Japan Feb/'02/350...

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Vp-rVp-n

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