Sharp VC-A565U Service Manual
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Sharp VC-A565U Service Manual

Video cassette recorder
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Table of Contents

See also: Operating Manual
VC-A565U
VC-H965U
1. GENERAL INFORMATION ........................................................................................................... 5
2. DISASSEMBLY AND REASSEMBLY ........................................................................................... 7
3. FUNCTION OF MAJOR MECHANICAL PARTS ......................................................................... 10
5. ELECTRICAL ADJUSTMENT ..................................................................................................... 30
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ...................... 32
7. TROUBLESHOOTING ................................................................................................................ 38
8. BLOCK DIAGRAM....................................................................................................................... 50
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ................................................................. 58
10. REPLACEMENT PARTS LIST .................................................................................................... 71
11. EXPLODED VIEW OF MECHANICAL PARTS ........................................................................... 76
12. PACKING OF THE SET .............................................................................................................. 83
SHARP CORPORATION
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
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
1
VIDEO CASSETTE RECORDER
VC-A565U
VC-H965U
VC-A565U/H965U
S41R7VC-A411U
Page

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Summary of Contents for Sharp VC-A565U

  • Page 1: Table Of Contents

    VC-A565U/H965U SERVICE MANUAL S41R7VC-A411U VIDEO CASSETTE RECORDER VC-A565U VC-A565U VC-H965U MODELS VC-H965U 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-A565U/H965U IMPORTANT SERVICE NOTES etc.) and measure the AC voltage drop across the BEFORE RETURNING THE VIDEO CASSETTE resistor. Reverse the AC plug on the set and repeat RECORDER 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-A565U/H965U NOTES DE SERVICE IMPORTANTES AVANT DE RENDRE LE MAGNETOSCOPE pièces métalliques exposées ayant un parcours de retour au châssis (connexions d’antenne, coffret Avant de rendre le magnétoscope à l’utilisateur, effectuer métallique, tétes de vis, boutons et arbres de commande, etc.) et mesurer la chute de tension CA les vérifications de sécurité...
  • Page 4 VC-A565U/H965U 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 5: General Information

    1-1 FEATURES Only for VC-H965U • Universal Remote Control • Hi-Fi Stereo Sound • Sharp Super Picture • Built-in MTS (Multi-channel TV Sound) Decoder • 5 sec. Timer Backup • Built-in Front AV Jacks • Field-Still/Variable Slow/Frame Advance • Real-Time Counter (On Screen Display) Common Features •...
  • Page 6 VC-A565U/H965U 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...

  • Page 7: Disassembly And Reassembly

    VC-A565U/H965U 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. TOP CABINET TOP CABINET : Remove 2 screws 2 and 7 clips 3. FRONT PANEL : Remove 1 screw 4. OPERATION SHIELD ANGLE : Remove 1 screw 5 with shield angle.
  • Page 8 VC-A565U/H965U 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 3 fixing the cassette housing to the remove the antenna cover 1 screw 1, and remove the mechanism, and remove the cassette housing.
  • Page 9 VC-A565U/H965U 2-3 CARES WHEN REASSEMBLING housing. (Conditions: When mechanism and PWB have INSTALLING THE CASSETTE HOUSING 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 After ascertaining the return to the initial set position install mechanical.

  • Page 10: Function Of Major Mechanical Parts

    VC-A565U/H965U 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head A/C head ass’y Supply pole base ass’y Reverse guide lever ass’y Tension arm Reel relay gear Idler wheel ass’y Take-up reel disk Open guide Pinch roller lever ass’y...
  • Page 11 VC-A565U/H965U FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Syncro Gear Clutch lever Master cam Limiter pulley ass’y Capstan D.D. motor Shifter Reel belt...

  • Page 12: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-A565U/H965U 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 13 VC-A565U/H965U 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. Maintained 1000 1500 2000 Possible symptom Remarks hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 14 VC-A565U/H965U 4-3 REMOVING AND INSTALLING THE CAS- Notes: SETTE HOUSING 1. In the case when you use the magnet screw driver, never approach the magnet driver to the A/C head, FE head, • Removal and drum. 1. In the cassette removing mode, remove the cassette.
  • Page 15 VC-A565U/H965U 4-5 REEL DISK REPLACEMENT AND HEIGHT Notes: CHECK 1. When installing the reel disk, take due care so that the • Removal tension band ass'y is not deformed and grease does no 1. Remove the cassette housing control assembly.
  • Page 16 VC-A565U/H965U 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 17 VC-A565U/H965U 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 18 VC-A565U/H965U 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 • Checking 1.
  • Page 19 VC-A565U/H965U 2. Visually check to see if the position of the tension pole is Tension pole adjustment driver adjusting direction within the 0 0.2mm from the left side line. Standard A = 0 0.2mm Tension pole adjustment driver Make the adjustment with the beginning of a T-120 tape.
  • Page 20 VC-A565U/H965U • 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 21 VC-A565U/H965U 4-15 REPLACEMENT OF A/C (AUDIO/CONTROL) 3. Align the left end of gear of A/C head arm with the punched mark of chassis, tentatively tighten the screws HEAD 1 so as to ensure smooth motion of A/C head arm. 1. Remove the cassette housing control assembly.
  • Page 22 VC-A565U/H965U 4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT 4-17 ADJUSTMENT OF TAPE DRIVE TRAIN 1. Tape run rough adjustment 1 Remove the cassette housing control assembly. • Setting Azimuth screw 2 After shortcircuiting between TP803 and TP802 pro- vided at operation PWB, plug in the power cord.
  • Page 23 VC-A565U/H965U Notes: 1. Previously set the tracking control in the center position, and adjust the ATR signal waveform to maximum with X value adjustment nut. Thereby the tape run rough ad- justment is facilitated. 2. Especially the outlet side ATR signal waveform must have higher flatness.
  • Page 24 VC-A565U/H965U 3 Next, press the tracking button (+), (–) and change the ATR signal waveform from max to min and from PB ATR min to max. At this time adjust the height of supply Signal and take-up side guide roller with the adjustment driver (JiGDRiVERH-4) so that the ATR signal wave- form changes nearly parallel.
  • Page 25 VC-A565U/H965U 4-19 REPLACEMENT OF DRUM D.D. MOTOR 4-18 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 26 VC-A565U/H965U 4-20 REPLACING THE UPPER AND LOWER 4-21 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 4-19 D.D. motor replace- 1.
  • Page 27 VC-A565U/H965U 4-22 INSTALLING THE SHIFTER 1. Make sure that the loading arm T and S are at the Phase- Matching point as shown below 2. Fix the shifter position setting part to the roading arm T Drum position setting part as shown in figure 3.
  • Page 28 VC-A565U/H965U 4-23 INSTALLING THE MASTER CAM (AT 4-24 REPLACEMENT OF LOADING MOTOR • Removal REAR SIDE OF MECHANISM CHASSIS) 1. Make sure beforehand that the shifter is at initial posi- tion. 2. Place the master cam in the position as shown below.
  • Page 29 VC-A565U/H965U 4-25 ASSEMBLY OF CASSETTE HOUSING 1. Proof lever Proof lever spring and Holder R MSPRD0215AJFJ *Proof lever spring fixing direction designated. Figure 4-41. 2. Frame R, Frame L, Drive Arm R, Drive Arm L, Upper Plate. LANGF9661AJFW Top surface should be free from scratches or soil.

  • Page 30: Electrical Adjustment

    VC-A565U/H965U 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 cannot be completed.
  • Page 31 VC-A565U/H965U 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 (See Note below 2)
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  • Page 49 VC-A565U/H965U - M E M O -...

  • Page 50: Block Diagram

    VC-A565U/H965U VC-A565U/H965U 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 50~51...
  • Page 51 VC-A565U/H965U VC-A565U/H965U SIGNAL FLOW BLOCK DIAGRAM(A565U) 52~53...
  • Page 52 VC-A565U/H965U VC-A565U/H965U SIGNAL FLOW BLOCK DIAGRAM(A965U) 54~55...
  • Page 53 VC-A565U/H965U POWER CIRCUIT BLOCK DIAGRAM...

  • Page 54: Schematic Diagram

    VC-A565U/H965U 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 record mode or the play mode voltage is indi- IMPORTANT FOR MAINTAINING THE SAFETY cated as follows.
  • Page 55 VC-A565U/H965U POWER CIRCUIT BLOCK DIAGRAM...
  • Page 56 VC-A565U/H965U 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 record mode or the play mode voltage is indi- IMPORTANT FOR MAINTAINING THE SAFETY cated as follows.

  • Page 57: Schematic Diagram And Pwb Foil Pattern

    VC-A565U/H965U VC-A565U/H965U 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 58~59...
  • Page 58 VC-A565U/H965U VC-A565U/H965U MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 60~61...
  • Page 59 VC-A565U/H965U VC-A565U/H965U MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 62~63...
  • Page 60 VC-A565U/H965U VC-A565U/H965U MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 64~65...
  • Page 61 VC-A565U/H965U OPERATION CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
  • Page 62 VC-A565U/H965U PWB FOIL PATTERN OPERATION PWB LCD PWB...
  • Page 63 VC-A565U/H965U VC-A565U/H965U MAIN PWB 68~69...
  • Page 64 VC-A565U/H965U - M E M O -...

  • Page 65: Replacement Parts List

    Pour que votre commande soit rapidement et correctement remplie, 3. PART NO. 4. DESCRIPTION veuillez fournir les renseignements suivants. in USA : Contact your nearest SHARP Parts Distributor to order. 1. NUMERO DU MODELE 2. NO. DE REF For location of SHARP Parts Distributor, Please Call Toll-free;...
  • Page 66 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code Q968 VS2SA1530ARS1 V 2SA1530AR C166 VCKYCY1EB223K V 0.022 25V Ceramic Q7781 VS2SC3052EF-1 V 2SC3052EF (VC-H965U) C167 VCKYCY1CB104K V 0.1 16V Ceramic DIODES AND LED’S (VC-H965U) C168 VCEA9M1CW106M V 10...
  • Page 67 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code C521 VCCCCY1HH5R0C V 5p 50V Ceramic C705 VCKYCY1CF104Z V 0.1 16V Ceramic C602 VCKYCY1EB103K V 0.01 25V Ceramic C706 VCKYCY1CF104Z V 0.1 16V Ceramic C603 VCEA9M1CW106M V 10...
  • Page 68 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code R105 VRD-RA2BE681J V 680 1/8W Carbon R655 VRD-RA2BE473J V 47k 1/8W Carbon R111 VRS-CY1JF153J V 15k 1/16W Metal Oxide (VC-H965U) R112 VRS-CY1JF153J V 15k 1/16W Metal Oxide...
  • Page 69 VRS-CY1JF103J V 10k 1/16W Metal Oxide å FH902 QFSHD1018CEZZ V Fuse Holder R773 VRD-RA2BE103J V 10k 1/8W Carbon J201 QJAKH0011AJZZ V Jack(VC-A565U) R781 VRS-CY1JF103J V 10k 1/16W Metal Oxide J201 QJAKL0024AJZZ V Jack(VC-H965U) R782 VRS-CY1JF103J V 10k 1/16W Metal Oxide...
  • Page 70 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code LX-RZ3015GEFJ J CS Washer MECHANISM CHASSIS PARTS XRESJ30-06000 V E-3(MASTERCAM) XWHJZ31-03052 V Reel Washer 0.3 XWHJZ31-04052 V Reel Washer 0.4 LBNDK1021AJZZ V Tension Band Ass’y XWHJZ31-05052 V Reel Washer 0.5...
  • Page 71 RRMCG1237AJSB V Infrared Remote Control Unit TiNS-4085AJZZ V Instruction Book PACKING PARTS (NOT REPLACEMENT ITEM) SPAKC4989AJZZ - Packing Case(VC-H965U) — SPAKC4990AJZZ - Packing Case(VC-A565U) — SPAKX1152AJZZ - Packing Foam. — TLABV0182AJZZ - Bar Code Label — SPAKAA012WJZZ - Packing Cushion —...

  • Page 72: Exploded View Of Mechanical Parts

    VC-A565U/H965U 11. EXPLODED VIEW OF MECHANICAL PARTS Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
  • Page 73 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
  • Page 74 VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS VC-H965U VC-A565U...
  • Page 75 VC-A565U/H965U Ref. No. Part No. Description Code FRONT PANEL PARTS(VC-A565U) Ref. No. Part No. Description Code 500-7 500-3 500-11 500-6 500-1 500-4 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover Cassette cover...
  • Page 76 VC-A565U/H965U FRONT PANEL PARTS(VC-H965U) Ref. No. Part No. Description Code Ref. No. Part No. Description Code 500-7 500-3 500-11 500-1 500-6 500-4 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover Cassette cover...

  • Page 77: Packing Of The Set

    VC-A565U/H965U Ref. No. Part No. Description Code Ref. No. Part No. Description Code 12. PACKING OF THE SET Setting position of the Knobs RF conv. CH. preset at "3" channel Accessories TiNS-4085AJZZ Instruction Book Dry Battery RRMCG1237AJSB Infrared Remote Control Unit...
  • Page 78 Part No. Description Code © COPYRIGHT 2002 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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