FILE NO. BASIC SERVICE TECHNICAL INFORMATION Time Lapse/Real Time Video Cassette Recorder VP-R/VP-N MECHANISM 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. AN OVERVIEW OF THE MECHANISM MODES .................... 6 3. DISASSEMBLING THE MAIN PARTS OF THE MECHANISM 3-1.
1. MAINTAINING AND CHECKING THE MECHANISM 1-1. REGULAR CHECKS AND MAINTENANCE ITEMS 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 rod with a diameter of 1.5mm after it is dipped in oil to a depth of 1cm and then taken out.
1-2. 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 NTSC: For models with 525 scanning lines and a field frequency of 60Hz No. Tool Tool No.
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. 2.
2-1-2.
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. HEX DATA 6 4 0 6 2 Mechanism mode The principal mode-switching states of the mechanism CASSETTE OUT (EJECT) EJECT Distinguished by whether the EP switch is ON or OFF. Horizontal shift section. Vertical shift section.
2-2-2. MOVEMENT CHECK LIST FOR THE MAIN PARTS OF THE MECHANISM IN REW INITIAL (LOADING) (UNLOADING) REV IDLER STILL/SLOW PLAY/STOP BRAKE (POWER OFF) FF/REW R.STILL/ R.
3. DISASSEMBLING THE MAIN PARTS OF THE MECHANISM 3-1-2. MAKING THE MECHANISM MOVE USING THE MANUAL METHOD 1) Refer to section 3-2 and remove the mechanism unit. 2) Refer to section 3-15 and remove the wheel gear 2. 3) If you turn the main cam counterclockwise, the mechanism will switch to a mode such as PLAY or FF/REW. To switch from FF/REW mode to EJECT mode, turn the main cam clockwise.
3-2. MECHANISM UNIT (See Figs. 3-2-1 and 3-2-2) 3-3. CASSETTE DRIVE MECHANISM 1) Remove the top cover, bottom cover and front cabinet assembly. 2) Unplug the flat cable from the CP-1 PWB assembly on the cylinder (drum), and unplug the ACE/FE head connectors . 3) Unplug the flat cable from the stator. 4) Unplug the dew sensor connector . 5) Remove the four screws , then lift up the mechanism unit.
3-3-2. CASSETTE DRIVE GEAR (See Fig.3-3-3) 3-3-3.DOOR OPENER, UNDER FRAME AND STAND L (See Fig.3-3-4) 1) Refer to section 3-3-1 and remove the cassette mechanism assembly. 2) Remove clamps and , then remove the gear holder . 3) Remove the clamp , then remove the pinion gear . 4) Remove the clamp , then remove the lock gear . 1) Remove the cassette mechanism assembly, referring to section 3-1. 2) Remove the two clamps and take out the under frame , pulling it towards you.
3-3-4.START RACK GEAR AND FRONT RACK GEAR (See Figs.3-3-5 and 3-3-6) 3-4. CLEANER ROLLER ASSEMBLY (See Fig.3-4-1) 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 towards the front until it stops, then take it off the shaft . Take care not to damage the shaft . 4) Remove the spring .
3-5. CYLINDER (DRUM) (See Fig. 3-5-1 to 3-5-3) Screws Flexible cable 3-5-1.CYLINDER (DRUM) MOTOR, UPPER CYLINDER ASSEMBLY Stator 1) Disconnect the flexible cable connected to the stator . 2) Remove the two screws , and remove the stator , and spring . In this state, the cylinder earth chip will fall off if the top and bottom of the mechanism unit are reversed. Note: Cylinder earth chip can be removed by removing the cylinder motor mounting in step 4). 3) Remove the two screws and remove the rotor .
3-5-2. CYLINDER MOUNTING (See Figs. 3-5-4 and 3-5-5) ASSEMBLY NOTES: 1. 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 . Taking care not to scratch or soil the tape path surface of the cylinder (drum), lift the cylinder mounting slightly, and keeping it raised. (See Fig. 3-5-4) 2. 3. 4. 5.
3-6. FE HEAD AND ACE HEAD 3-6-2. FULL ERASE HEAD (See Fig.3-6-2) 1) Unplug the connector from the full erase head . 2) Remove the screw and the full erase head . 3-6-1. AUDIO R/P HEAD ASSEMBLY (ACE HEAD) (See Fig.3-6-1) ASSEMBLY NOTE: 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) and the washer . 1. After assembly, clean the full erase head . Screw ASSEMBLY NOTES: 1. 2. 3. 4.
3-7. CAPSTAN MOTOR ASSEMBLY NOTES: 1. 3-7-1. CAPSTAN MOTOR [Case 1. High speed FF/REW model] (See Fig. 3-7-1) 2. 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 from the capstan or mechanism chassis. motor 3. Check that connector is inserted in the CP-1 PWB assembly. When fitting the three screws , use the torque gauge screwdriver (VHJ-0014).
3-8. LOADING MOTOR ASSEMBLY AND WORM GEAR ASSEMBLY (See Fig.3-8-1) 3-9. PINCH ROLLER PRESSURE MECHANISM 1) Refer to section 3-2 and remove the mechanism unit. 2) Remove the soldering on the lead wires of the loading motor assembly from the MC-1 PWB assembly. When you do this, be careful not to let the soldering iron touch any other parts. 3) Press the clamp , and remove the loading motor assembly and the damper . Be careful not to exert too much force on the clamp . 4) Remove the worm gear assembly .
3-9-2.PINCH LIFT CAM AND PINCH CAM GEAR (See Figs.3-9-2 and 3-9-3) Arrow on MC-1 PWB assembly 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. 3) After removing the screw , undo the three clamps , then remove the opener mounting . 4) Remove the clamp and the pinch lift cam . 5) Remove the pinch cam gear .
3-10. L GUIDE ACT LEVER ASSEMBLY, LOAD LEVER ASSEMBLY AND STOPPER LEVER ASSEMBLY (See Fig.3-10-1) 3-11. BT LEVER ASSEMBLY (See Fig.3-11-1) 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 BT spring , and remove the sub BT spring on the underside of mechanism chassis. 4) Remove the clamp on the underside of the mechanism chassis, then remove the BT lever assembly . 5) Remove the clamp on the band brake assembly .
3-12. REEL DRIVE MECHANISM Screws Part A 3-12-1.REEL BELT, REEL PULLEY, FRICTION GEAR ASSEMBLY AND CLUTCH CHANGE LEVER (See Fig.3-12-1) 1) 2) Refer to section 3-2 and remove the mechanism unit. Remove the reel belt from the reel pulley . 3) 4) Take off the washer Take off the washer 5) assembly . Remove the clutch change spring 6) Hole Hole and remove the reel pulley . and remove the friction gear Clutch mounting assembly .
3-12-4.T SOFT BRAKE ASSEMBLY, TAKE UP REEL ASSEMBLY, T REEL GEAR (See Fig.3-12-4) 3-13. BRAKES 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 mounting assembly. 4) Pressing the T brake assembly in the direction of , the arrow, remove the take up reel assembly 3-13-1.S BRAKE ASSEMBLY, T BRAKE ASSEMBLY, T BRAKE ACT SLIDE (See Fig.
3-13-2.BRAKE CONTROL LEVER AND BRAKE ACT LEVER ASSEMBLY (See Fig.3-13-2) 3-13-3.S BRAKE ACT SLIDE AND BT SPRING LEVER ASSEMBLY (See Figs.3-13-3 and 3-13-4) 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. 4) Remove the clamp , then remove the wheel gear 1 . 5) Remove the clutch change spring . 6) Remove the clamps and , then remove the brake control lever .
3-14. GUIDES 3-14-2.S AND T INCLINE MOUNTING ASSEMBLIES (See Fig.3-14-2) 3-14-1. GUIDE ROLLER ASSEMBLY (See Fig.3-14-1) 1) Refer to section 3-2 and remove the mechanism unit. 2) Refer to section 3-5-2 and remove the cylinder unit. 3) Refer to section 3-1 and rotate the loading motor in the PLAY direction until tape loading is completed. 4) Shift the S incline mounting assembly slightly, in the direction of the arrow , then remove it from the S load lever assembly .
3-15. WHEEL GEAR 2, MAIN CAM AND OPT PINCH RELAY GEAR (See Figs.3-15-1 and 3-15-2) Washer 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 . 4) Remove the clamp , then remove the OPT pinch relay gear . OPT pinch relay gear Main cam Clamp Clamp Wheel gear 2 ASSEMBLY NOTES: 1. 2. 3. 4. 5.
3-16. CRESCENT SLIDE (See Figs.3-16-1 and 3-16-2) Screw 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 mechanism assembly. 3) Refer to section 3-7-2 and remove the capstan brake assembly. 4) Refer to section 3-12-4 and remove the T soft brake assembly. 5) Refer to section 3-13-1 and remove the T brake act slide. 6) Refer to section 3-12-1, then remove the reel belt and the reel pulley.
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) (T side) Apply grease here 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. 3) Remove the clamp , then remove the components: the S load gear , the S load spring and the S load lever assembly . When you do this, be careful not to damage the clamp , which can be damaged easily.
3-18. TAPE SENSORS, REEL SENSOR AND EP SW LEVER Photo diode (reel sensor) Cut 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 , and the LED . When removing the photo diode on the tape top sensor side, refer to section 3-15 and remove the main cam.
4. MECHANISM CHECKS AND ADJUSTMENTS Dummy cassette tape 4-1. REEL TABLE TORQUE CHECK Make holes with roughly the same diameter as the reels. 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. NOTES: 1. The measurements must be taken without any incandescent light or daylight. 2.
4-3. TAPE PATH ADJUSTMENT 4-3-2.LOAD LEVER ASSEMBLY HEIGHT ADJUSTMENT (See Fig.4-3-2) 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 oscilloscope.
4-3-3.GUIDE ROLLER HEIGHT ADJUSTMENT (See Figs.4-3-3 and 4-3-4) Normal 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.
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) (2) Horizontal position adjustment (See Fig.4-3-6) 1) Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ0009). 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.
4-3-5.CHECKING AFTER ADJUSTMENT 1) Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ0009) and check that the envelope waveform is activated immediately and that there are no fluctuations in the envelope waveform or the audio output waveform. 2) Load a cassette tape (NTSC: T-120, PAL: E-180) and use it to record and replay. Check that the envelope waveform is activated immediately and that there are no fluctuations in the envelope waveform or the audio output waveform.
Feb/'02/350 SANYO Electric Co., Ltd.
