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Sharp VC-A411M Service Manual

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1. GENERAL INFORMATION ............................................................................................................ 4
2. DISASSEMBLY AND REASSEMBLY ............................................................................................ 6
3. FUNCTION OF MAJOR MECHANICAL PARTS ........................................................................... 9
5. ELECTRICAL ADJUSTMENT ...................................................................................................... 30
7. TROUBLESHOOTING ................................................................................................................. 38
8. BLOCK DIAGRAM ....................................................................................................................... 49
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN .................................................................. 57
10. REPLACEMENT PARTS LIST .................................................................................................... 71
11. EXPLODED VIEW OF MECHANICAL PARTS ............................................................................ 78
12. PACKING OF THE SET .............................................................................................................. 82
SERVICE MANUAL
MODELS
In the interests of user-safety (Required by safety regula-
tions 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
VIDEO CASSETTE RECORDER
VC-A411M
VC-H811M
VC-A411M
VC-H811M
S40A1VC-A411M
Page

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  • Page 1: Table Of Contents

    VC-A411M VC-H811M SERVICE MANUAL S40A1VC-A411M VIDEO CASSETTE RECORDER VC-A411M VC-H811M MODELS In the interests of user-safety (Required by safety regula- tions in some countries) the set should be restored to its original condition and only parts identical to those specified be used.
  • Page 2 VC-A411M VC-H811M IMPORTANT SERVICE NOTES etc.) and measure the AC voltage drop across the BEFORE RETURNING THE VIDEO CASSETTE RECORDER resistor. Reverse the AC plug on the set and repeat AC voltage measurements for each exposed part. Before returning the video cassette recorder to the user, Any reading of 0.45V rms (this corresponds to 0.3mA...
  • Page 3 VC-A411M VC-H811M 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 4: General Information

    1-1 FEATURES Only for VC-H811M • Unified Remote Control • Hi-Fi Stereo Sound • Sharp Super Picture • Built-in MTS (Multi-channel TV Sound) Decoder • 1minute Timer Backup • Field-Still/Variable Slow/Frame Advance Common Features • Real-Time Counter (On Screen Display) •...
  • Page 5 VC-A411M VC-H811M 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...

  • Page 6: Disassembly And Reassembly

    VC-A411M VC-H811M 2. DISASSEMBLY AND REASSEMBLY TOP CABINET 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. TOP CABINET : Remove button 2. FRONT PANEL Remove 2 screws 3 and 7 clips 4. : Remove 1 screw 5. OPERATION SHIELD SHIELD ANGLE : Remove 1 screw 6 with shield angle.
  • Page 7 VC-A411M VC-H811M 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 8 VC-A411M VC-H811M 2-3 CARES WHEN REASSEMBLING cassette housing. (Conditions: When mechanism and PWB INSTALLING THE CASSETTE HOUSING 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 and Feed the pulley feed gear of loading motor with screw mechanical.

  • Page 9: Function Of Major Mechanical Parts

    VC-A411M VC-H811M 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head Take-up main brake Supply pole base ass’y Pinch drive cam Tension arm A/C head ass’y Idler wheel ass’y Reverse guide lever ass’y Pinch drive lever ass’y...
  • Page 10 VC-A411M VC-H811M FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Drum ass’y Reel belt Loading motor Clutch lever Drum drive motor Limiter pulley ass’y Take-up pole base ass’y Shifter Slow brake lever Master cam Capstan D.D. motor...

  • Page 11: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-A411M VC-H811M 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 12 VC-A411M VC-H811M 4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine. 1000 1500 2000 Possible symptom Maintained Remarks hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 13 VC-A411M VC-H811M 4-3 REMOVING AND INSTALLING THE CAS- Notes: SETTE 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 14 VC-A411M VC-H811M 4-5 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 15 VC-A411M VC-H811M 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 16 VC-A411M VC-H811M Notes: 4-9 CHECKING AND ADJUSTMENT OF TAKE- 1. Hold the torque gauge by hand so that it is not moved. UP TORQUE IN VIDEO SEARCH REWIND 2. Do not keep the reel disk in lock state. Do not allow long- MODE time measurement.
  • Page 17 VC-A411M VC-H811M 4-10 CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. • After short-circuiting between TP803 and TP802 Tension gauge Pinch roller provided at operation PWB, plug in the power cord. 900 - 1,200gf •...
  • Page 18 VC-A411M VC-H811M 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 19 VC-A411M VC-H811M • 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 20 VC-A411M VC-H811M 4-15 REPLACEMENT OF A/C (AUDIO/CONTROL) C head front section) (See the figure below.) 3. Align the left end of gear of A/C head arm with the HEAD punched mark of chassis, tentatively tighten the screws 1. Remove the cassette housing control assembly.
  • Page 21 VC-A411M VC-H811M 4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT 4-17 HEIGHT ADJUSTMENT OF REVERSE GUIDE • Setting Azimuth screw 1. Adjust the height from the mechanism chassis to the reverse guide lower flange to 13.38 mm, using the reverse guide height adjustment jig, in tape loading state.
  • Page 22 VC-A411M VC-H811M 4-18 ADJUSTMENT OF TAPE DRIVE TRAIN Notes: 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.
  • Page 23 VC-A411M VC-H811M 3 Next, press the tracking button (+), (–) and change the envelope waveform from max to min and from PB CHROMA min to max. At this time adjust the height of supply Envelope and take-up side guide roller with the adjustment driver (JiGDRiVERH-4) so that the envelope wave- form changes nearly parallel.
  • Page 24 VC-A411M VC-H811M 4-20 REPLACEMENT OF DRUM D.D. MOTOR 4-19 REPLACEMENT OF THE CAPSTAN D.D. 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 2- 2 item 1 When removing the mechanism from the main •...
  • Page 25 VC-A411M VC-H811M 4-21 REPLACING THE UPPER AND LOWER 4-22 ASSEMBLING OF PHASE MATCHING DRUM 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 4-20 D.D. motor replace- 1.
  • Page 26 VC-A411M VC-H811M 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 27 VC-A411M VC-H811M 4-23 INSTALLING THE SHIFTER 1. Make sure that the loading gear is at the Phase-Match- ing 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 Phase-Matching point 2 as shown below.
  • Page 28 VC-A411M VC-H811M 4-24 INSTALLING THE MASTER CAM (AT 4-25 REPLACEMENT OF LOADING MOTOR • Removal REAR 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 29 VC-A411M VC-H811M 4-26 ASSEMBLY OF CASSETTE HOUSING 1. Drive Gear and R Drive angle ass’y MSPRT0381AJFJ Apply grease Apply grease Apply grease Figure 4-47. 2. Synchro Gear, Drive Gear L and Drive Gear R LANGF9592AJFW Top surface should be free from scratches or soil.

  • Page 30: Electrical Adjustment

    VC-A411M VC-H811M 5. ELECTRICAL ADJUSTMENT Notes: • Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechanical 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 31 VC-A411M VC-H811M SERVO CIRCUIT ADJUSTMENT 5-2 ADJUSTMENT OF FV (False Vertical Sync) OF STILL PICTURE 5-1 ADJUSTMENT OF HEAD SWITCHING Measuring Color TV monitor POINT instrument Measuring Dual-trace oscilloscope Mode Playback still instrument Cassette Self-recorded tape (SP mode) Mode Playback...

  • Page 32: Mechanism Operation Flowchart And Troubleshooting Guide

    VC-A411M VC-H811M...
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  • Page 38: Troubleshooting

    VC-A411M VC-H811M...
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  • Page 49: Block Diagram

    VC-A411M VC-H811M 8. BLOCK DIAGRAM POWER BLOCK DIAGRAM...
  • Page 50 VC-A411M VC-H811M SYSTEM SERVO BLOCK DIAGRAM...
  • Page 51 VC-A411M VC-H811M...
  • Page 52 VC-A411M VC-H811M SIGNAL FLOW BLOCK DIAGRAM(VC-A411M)
  • Page 53 VC-A411M VC-H811M Playback luminance signal Playback chroma signal Audio playback signal E-E signal Recording luminance signal Recording chroma signal Audio recording signal E-E signal(Audio)
  • Page 54 VC-A411M VC-H811M SIGNAL FLOW BLOCK DIAGRAM(VC-H811M) Playbac Recordi...
  • Page 55 VC-A411M VC-H811M Audio playback signal E-E signal Playback luminance signal Playback chroma signal Audio recording signal E-E signal(Audio) Recording luminance signal Recording chroma signal...

  • Page 56: Schematic Diagram

    VC-A411M VC-H811M SCHEMATIC DIAGRAM • The indicated voltages in the following diagram IMPORTANT SAFETY NOTICE: are measured with an SSVM, upon receiving color bars (400 Hz sound signal) in either the PARTS MARKED WITH " å " ( ) ARE...

  • Page 57: Schematic Diagram And Pwb Foil Pattern

    VC-A411M VC-H811M 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN OPERATION CIRCUIT...
  • Page 58 VC-A411M VC-H811M MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 59 VC-A411M VC-H811M...
  • Page 60 VC-A411M VC-H811M MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 61 VC-A411M VC-H811M...
  • Page 62 VC-A411M VC-H811M MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
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  • Page 64 VC-A411M VC-H811M MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 65 VC-A411M VC-H811M...
  • Page 66 VC-A411M VC-H811M PWB FOIL PATTERN MAIN PWB Component Side...
  • Page 67 VC-A411M VC-H811M...
  • Page 68 VC-A411M VC-H811M MAIN PWB Wiring Side...
  • Page 69 VC-A411M VC-H811M...
  • Page 70 VC-A411M VC-H811M OPERATION PWB Component Side Wiring Side...

  • Page 71: Replacement Parts List

    å D901 (NOT REPLACEMENT ITEM) VHDRL1N4004-1 V RL1N400 å D902 VHDRL1N4004-1 V RL1N400 å D903 VHDRL1N4004-1 V RL1N400 DUNTK5845TEVR - Main Unit (VC-A411M) — å D904 VHDRL1N4004-1 V RL1N400 DUNTK5845TEVS - Main Unit (VC-H811M) — å D905 VHD10ELS4//-1 V 10ELS4...
  • Page 72 VC-A411M VC-H811M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKAGED CIRCUITS C214 VCKYCY0JF105Z 6.3V Ceramic å R901 C215 VCKYCY0JF105Z 6.3V Ceramic RR-DZ0047CEZZ V Resistor C217 VCEA9M0JW107M V 100 6.3V Electrolytic C218 VCKYCY0JF105Z 6.3V Ceramic CRYSTALS C219 VCKYCY1CF104Z V 0.1...
  • Page 73 VC-A411M VC-H811M Ref. No. Part No. Description Code Ref. No. Part No. Description Code C611 VCKYCY1CF104Z V 0.1 16V Ceramic C715 VCEA9M0JW226M V 22 6.3V Electrolytic C613 VCKYCY1EB183K V 0.018 25V Ceramic C717 VCKYCY1HB221K V 220p 50V Ceramic (VC-A411M) C718 VCKYCY1CF104Z V 0.1...
  • Page 74 VC-A411M VC-H811M Ref. No. Part No. Description Code Ref. No. Part No. Description Code RESISTORS R621 VRD-RA2EE4R7J V 4.7 1/4W Carbon R623 VRS-CY1JF393J V 39k 1/16W Metal Oxide AA VRS-CY1JF000J V 00 1/16W Metal Oxide AA R624 VRS-CY1JF224J V 220k 1/16W Metal Oxide AA...
  • Page 75 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA å FH902 QFSHD1014CEZZ V Fuse Holder R833 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA J201 QJAKH0013AJZZ V Jack (VC-A411M) R841 VRD-RA2BE183J V 18k 1/8W Carbon J201 QJAKL0006AJZZ V Jack (VC-H811M) R842 VRD-RA2BE103J V 10k 1/8W Carbon...
  • Page 76 J Switch, Menu MSPRC0213AJFJ V Earth Spring S806 QSW-K0086GEZZ J Switch, CH + MSPRT0416AJFJ V Tension Spring SC301 QSOCN0611REN1 V Socket (VC-A411M) NBLTK0067AJ00 V Reel Belt SC301 QSOCN0911REN1 V Socket (VC-H811M) NDAiV1078AJ00 V Reel Disk SC601 QSOCN0695REZZ V Socket SC602...

  • Page 77: Supplied Accessories

    V Holder (L) LHLDX1031AJZZ V Holder (R) (NOT REPLACEMENT ITEM) LHLDX1032AJ00 V Frame (R) MLEVF0469AJFW V Proof Lever (R) SPAKC4375AJZZ - Packing Case(VC-A411M) — MLEVP0281AJ00 V Door Open Lever SPAKC4376AJZZ - Packing Case(VC-H811M) — MSLiF0076AJFW V Slider SPAKX1073AJZZ - Packing Foam —...

  • Page 78: Exploded View Of Mechanical Parts

    VC-A411M VC-H811M 11. EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS EXPLODED VIEW...
  • Page 79 VC-A411M VC-H811M CASSETTE HOUSING CONTROL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 80 VC-A411M VC-H811M MECHANICAL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code VC-H811M VC-A411M...
  • Page 81 VC-A411M VC-H811M FRONT PANEL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code 500-7 500-3 500-2 500-1 500-4 500-6 500-5 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever...

  • Page 82: Packing Of The Set

    VC-A411M VC-H811M 12. PACKING OF THE SET Ref. No. Part No. Description Code Ref. No. Part No. Description Code Accessories TiNS-3760AJZZ Operation Manual Dry Battery RRMCG1265AJSA Infrared Remote Control Unit QCNW-8115AJZZ 75 ohm Coaxial Cable SPAKX1073AJZZ Packing Foam TLABK0005AJZZ No. Label...
  • Page 83 VC-A411M VC-H811M Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 84 Code Ref. No. Part No. Description Code COPYRIGHT © 2000 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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