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Sharp VC-TA350 Service Manual

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VC-TA352W Only
1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
7. TROUBLESHOOTING ........................................................................................................ 37
8. BLOCK DIAGRAM ............................................................................................................... 48
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 56
10. REPLACEMENT PARTS LIST ............................................................................................ 68
11. EXPLODED VIEW ............................................................................................................... 75
12. PACKING OF THE SET ...................................................................................................... 79
SERVICE MANUAL
MODELS
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only
parts identical to those specified be used.
CONTENTS
SHARP CORPORATION
1
VC-TA350/TA351/351W
VC-TA352W/TA355/TA356
VIDEO CASSETTE RECORDER
VC-TA350
VC-TA351
VC-TA351W
VC-TA352W
VC-TA355
VC-TA356
S70E1VC-TA350
Page

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Summary of Contents for Sharp VC-TA350

  • Page 1: Table Of Contents

    VC-TA350/TA351/351W VC-TA352W/TA355/TA356 SERVICE MANUAL S70E1VC-TA350 VIDEO CASSETTE RECORDER VC-TA350 VC-TA351 VC-TA352W Only VC-TA351W VC-TA352W VC-TA355 VC-TA356 MODELS In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified be used.
  • Page 2 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 PRECAUTIONS IN PART REPLACEMENT When servicing the unit with power on, be careful to the section marked white all over. This is the primary power circuit which is live. When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn over the PWB with due care to the primary power circuit.

  • Page 3: Specifications

    Video recording system: Rotary, slant azimuth two heads helical scan system Video signal: PAL/MESECAM/NTSC colour or monochrome (System B/G, I, D/K) signals Recording/playing time: 240 min max. with SHARP E-240 tape (PAL: SP mode) 480 min max. with SHARP E-240 tape (PAL: LP mode) (Only for VC-TA351/TA351W, TA352W, TA355, TA356) 160 min max.

  • Page 4: Disassembly And Reassembly

    VC-TA350/TA351/351W VC-TA352W/TA355/TA356 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS TOP CABINET : Remove 2 screws 1. TOP CABINET : Remove 2 screws 3 and 7 clips 4. FRONT PANEL : Remove 1 screw 6. OPERATION SHIELD ANGLE : Remove 1 screws 7 with shield angle.
  • Page 5 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY 2. Removing the mechanism and cassette housing. 1. When removing the mechanism from the main PWB, Remove 2 screws 4 fixing the cassette housing to the remove the antenna cover 1 screw 1, and remove the mechanism, and remove the cassette housing.
  • Page 6 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 2-3 CARES WHEN REASSEMBLING cassette housing. (Conditions: When mechanism and INSTALLING THE CASSETTE HOUSING PWB have been installed) When the cassette housing is installed on the mechanism, the initial setting is essential condition. 2. Mechanical initial setting There are two initial setting methods, namely electrical Feed the pulley feed gear of loading motor with screw and mechanical.

  • Page 7: Function Of Major Mechanical Parts

    VC-TA350/TA351/351W VC-TA352W/TA355/TA356 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head Reverse guide lever ass’y Supply pole base ass’y Casecon drive gear Tension arm ass’y Take-up reel disk Idler wheel ass’y Pinch roller lever ass’y Pinch drive lever ass’y Drum ass’y...
  • Page 8 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Slow brake lever Clutch lever Master cam Limiter pulley ass'y Capstan D.D. motor Shifter Reel belt...

  • Page 9: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-TA350/TA351/351W VC-TA352W/TA355/TA356 4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and adjustment service must be performed by the person who have finished the technical courses.
  • Page 10 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 MAINTENANCE CHECK ITEMS AND EXECUTION TIME Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine. Maintained 1000 1500 2000 Possible symptom Remarks hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 11 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REMOVING AND INSTALLING THE CASSETTE Notes: HOUSING 1. When fitting the S/E sensor holder to the cassette controller frame L/R, take care. • Removal 2. Misengagement of teeth of casecon drive gear and drive 1. In the cassette removing mode, remove the cassette.
  • Page 12 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REEL DISK REPLACEMENT AND HEIGHT 4. Assemble the Supply main brake ass'y. CHECK Notes: • Removal 1. When installing the reel disk, take due care so that the 1. Remove the cassette housing control assembly. tension band ass'y is not deformed and grease does no 2.
  • Page 13 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 Note: Notes: Whenever replacing the reel disk, perform the height check- 1. Hold the torque gauge by hand so that it is not moved. ing and adjustment. 2. Do not keep the reel disk in lock state. Do not allow long- time measurement.
  • Page 14 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 Notes: CHECKING AND ADJUSTMENT OF TAKE-UP 1. Hold the torque gauge by hand so that it is not moved. TORQUE IN VIDEO SEARCH REWIND MODE 2. Do not keep the reel disk in lock state. Do not allow long- •...
  • Page 15 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. • After short-circuiting TP801 provided at the center Tension gauge Pinch roller (facing to the main PWB), plug in the power cord. 8.8 ~ 11.8 N (900 - 1,200gf) •...
  • Page 16 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 2. Visually check to see if the right edge of the tension pole Tension pole adjuster adjusting range is within the 2.3 ± 0.25 from the right edge of the Sup guide shaft. Tension pole adjuster Sup guide shaft Tension pole 2.3 ±...
  • Page 17 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 • Adjustment • Checking the brake torque at the take-up side 1. If the indication of torque cassette meter is lower than the setting, shift the tension spring engagement to the part A. Torque gauge 2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B.
  • Page 18 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REPLACEMENT OF A/C (Audio/Control) HEAD 3. Align the left end of gear of A/C head plate with the punched mark of chassis, tentatively tighten the screws 1. Remove the cassette housing control assembly. 1 and 2 so as to ensure smooth motion of A/C head 2.
  • Page 19 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 A/C HEAD HEIGHT ROUGH ADJUSTMENT HEIGHT ADJUSTMENT OF REVERSE GUIDE • Setting 1. Adjust the height from the mechanism chassis to the Azimuth screw reverse guide lower flange to 13.38 mm, using the reverse guide height adjustment jig, in tape loading state.
  • Page 20 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 Notes: ADJUSTMENT OF TAPE DRIVE TRAIN 1. Previously set the tracking control in the center position, 1. Tape run rough adjustment and adjust the envelop waveform to maximum with X 1 Remove the cassette housing control assembly. value adjustment nut. Thereby the tape run rough ad- 2 After shortcircuiting TP801 provided at the center justment is facilitated.
  • Page 21 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 3 Next, press the tracking button (+), (–) and change PB CHROMA the envelope waveform from max to min and from Envelope min to max. At this time adjust the height of supply and take-up side guide roller with the adjustment driver (JiGDRiVERH-4) so that the envelope wave- form changes nearly parallel.
  • Page 22 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REPLACEMENT OF THE CAPSTAN D.D. REPLACEMENT OF DRUM D.D. MOTOR 1. Set the ejection mode. (DIRECT DRIVE) MOTOR 2. Withdraw the main power plug from the socket. • Remove the mechanism from the main PWB (refer to Page 6 item 1. When removing the mechanism from the •...
  • Page 23 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REPLACING THE UPPER AND LOWER DRUM ASSEMBLING OF PHASE MATCHING ASSEMBLY MECHANISM COMPONENTS • Assemble the phase matching mechanism compo- • Replacement (Perform in the numerical order) nents in the following order. 1 Remove the motor as stated in Page 22 D.D. motor 1.
  • Page 24 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 1Insert Reverse Guide Lever Ass’y Insert reverse guide lever ass'y 2 Insert pinch drive cam Align here. Turn the reverse guide lever assembly counterclockwise Fit the pinch drive cam so that the notch of pinch to the stopper.
  • Page 25 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 1. Make sure that the loading gear is at the PHASE- INSTALLING THE SHIFTER MATCHING point 1 as shown below. 2. Install, paying attention to insert point 5 and release point 3. Drum 3. For the phase matching at the insert point 1, see the Capstan PHASE-MATCHING point 2 as shown below.
  • Page 26 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 INSTALLING THE MASTER CAM (AT REAR REPLACEMENT OF LOADING MOTOR • Removal SIDE OF MECHANISM CHASSIS) 1. Make sure beforehand that the shifter is at the point as shown below. 2. Place the master cam in the position as shown below.
  • Page 27 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 ASSEMBLY OF CASSETTE HOUSING 1. Drive Gear and R Drive angle ass’y MSPRT0381GEFJ Apply grease Apply grease Apply grease Figure 4-47. 2. Synchro Gear, Drive Gear L and Drive Gear R LANGF9592GEFW Top surface should be free from scratches or soil.

  • Page 28: Electrical Adjustment

    VC-TA350/TA351/351W VC-TA352W/TA355/TA356 5. ELECTRICAL ADJUSTMENT Notes: • Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechani- cal parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments, otherwise adjustments can not be completed.
  • Page 29 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 SERVO CIRCUIT ADJUSTMENT ADJUSTMENT OF PAL SYSTEM SP/LP SLOW TRACKING PRESET ADJUSTMENT OF HEAD SWITCHING POINT Measuring Colour TV monitor Measuring Dual-trace oscilloscope instrument instrument Colour TV monitor Mode Playback Mode Playback Cassette Self-recorded tape Cassette Alignment tape (VROCPSV)
  • Page 30 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 ADJUSTMENT OF PAL SYSTEM FV (False TRACKING buttons so that the there is no noise disap- pears from the screen. Vertical Sync) OF STILL PICTURE 7. Press the STOP button to return to normal mode. Measuring Colour TV monitor 8.

  • Page 31: Mechanism Operation Flowchart And Troubleshooting Guide

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  • Page 37: Troubleshooting

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  • Page 46 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 REPLACEMENT OF IC710(E PROM) Servicing precautions When the IC710(E PROM) has been replaced, make the following reprogramming. Depending on models, the IC710(E PROM) has been factory adjusted for it’s memory function. It’s therefor necessary to reprogram the memory function for the model in question.
  • Page 47 VC-TA350/TA351/351W VC-TA352W/TA355/TA356 ROM MAP MODEL VC-TA350/355 VC-TA351/351W/TA356 VC-TA352 EP n ∗ ∗ NTSC Luminance level EP n ∗ ∗ NTSC Chrominance level SP n ∗ ∗ NTSC Luminance level SP n ∗ ∗ NTSC Chrominance level LP p ∗ ∗...

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Vc-ta351Vc-ta352wVc-ta351wVc-ta355Vc-ta356