Sharp VC-A415U Service Manual

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VC-A415U

VC-H815U

VC-H817U/H818U

1. GENERAL INFORMATION............................................................................................................ 5

2. DISASSEMBLY AND REASSEMBLY ............................................................................................ 7

3. FUNCTION OF MAJOR MECHANICAL PARTS ......................................................................... 10

4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ........................ 12

5. ELECTRICAL ADJUSTMENT ...................................................................................................... 31

6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ...................... 33

7. TROUBLESHOOTING ................................................................................................................. 39

8. BLOCK DIAGRAM ....................................................................................................................... 50

9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN .................................................................. 58

10. PARTS LIST ................................................................................................................................ 73

11. EXPLODED VIEW OF MECHANICAL PARTS ............................................................................ 82

12. PACKING OF THE SET .............................................................................................................. 88

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

VC-H815U/H817U/H818U

VC-A415U/H815U/H818U

This document has been published to be used for

after sales service only.

The contents are subject to change without notice.

VIDEO CASSETTE RECORDER

VC-A415U

VC-H815U

VC-H817U

VC-H818U

.............. Models for Canada

.............. Models for U.S.A.

VC-A415U/H815U

VC-H817U/H818U

S20W7VC-A415U

Page

Table of Contents

Summary of Contents for Sharp VC-A415U

Page 1: Table Of Contents
VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U SERVICE MANUAL S20W7VC-A415U VIDEO CASSETTE RECORDER VC-A415U VC-A415U VC-H815U VC-H817U VC-H818U MODELS VC-H815U 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-A415U/H815U VC-H817U/H818U IMPORTANT SERVICE NOTES BEFORE RETURNING THE VIDEO CASSETTE etc.) and measure the AC voltage drop across the RECORDER resistor. Reverse the AC plug on the set and repeat AC voltage measurements for each exposed part. Any reading of 0.45V rms (this corresponds to 0.3mA Before returning the video cassette recorder to the user, perform the following safety checks.
Page 3 VC-A415U/H815U VC-H817U/H818U 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...
Page 4 VC-A415U/H815U VC-H817U/H818U 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
Power Consumption: 18 W Weight: 2.8 kg (6.2 lbs) Dimensions (approx.): 360 (W) x 92.5 (H) x 255 (D) mm (14-3/16" x 3-41/64" x 10-3/64") (VC-A415U) 360 (W) x 92.5 (H) x 256 (D) mm (14-3/16" x 3-41/64" x 10-5/64") (VC-H815U) 360 (W) x 92.5 (H) x 254.5 (D) mm (14-3/16"...
Page 6 VC-A415U/H815U VC-H817U/H818U 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...
Page 7: Disassembly And Reassembly
2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. TOP CABINET TOP CABINET : Remove button 2. (VC-A415U/H815U) FRONT PANEL Remove 2 screws 3 and 7 clips 4. : Remove 1 screw 5. OPERATION SHIELD ANGLE : Remove 1 screw 6 with shield angle.
Page 8 Remove the PWB bottom plate 1 screw 2. Remove the FFC cable (AA, AD, AH) 3 which connect- ing the PWB and the mechanism. Take out vertically the mechanism so that it does not damage the adjacent parts. MECHANISM CHASSIS CASSETTE HOUSING Except VC-A415U MAIN PWB...
Page 9 For other, fix the vicinity of loading motor and solder joint side of main PWB.) Connect again the FFC cable (AA-MH, AD-ME, AH-MH) between the mechanism and the main PWB. AE CONNECTOR END SENSOR REC TIP SW Except VC-A415U AC CONNECTOR START SENSOR AL CONNECTOR...
Page 10: Function Of Major Mechanical Parts
VC-A415U/H815U VC-H817U/H818U 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 11 VC-A415U/H815U VC-H817U/H818U 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 12 VC-A415U/H815U VC-H817U/H818U 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 13 VC-A415U/H815U VC-H817U/H818U 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 14 VC-A415U/H815U VC-H817U/H818U 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 15 VC-A415U/H815U VC-H817U/H818U 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 16 VC-A415U/H815U VC-H817U/H818U 4-10. CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. • After short-circuiting TP803 and TP802 provided at Tension gauge Pinch roller operation PWB, plug in the power cord. 900 - 1,200gf • Checking 1.
Page 17 VC-A415U/H815U VC-H817U/H818U 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 18 VC-A415U/H815U VC-H817U/H818U • 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 19 VC-A415U/H815U VC-H817U/H818U 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 and 2 so as to ensure smooth motion of A/C head 1.
Page 20 VC-A415U/H815U VC-H817U/H818U 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 21 VC-A415U/H815U VC-H817U/H818U Notes: 4-18. ADJUSTMENT OF TAPE DRIVE TRAIN 1. Previously set the tracking control in the center position, 1. Tape run rough adjustment 1 Remove the cassette housing control assembly. and adjust the envelop waveform to maximum with X 2 After shortcircuiting TP803 and TP802 provided at value adjustment nut.
Page 22 VC-A415U/H815U VC-H817U/H818U 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 23 VC-A415U/H815U VC-H817U/H818U 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 24 VC-A415U/H815U VC-H817U/H818U 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 25 VC-A415U/H815U VC-H817U/H818U 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 26 VC-A415U/H815U VC-H817U/H818U 1. Make sure that the loading gear is at the Phase-Match- 4-23. INSTALLING THE SHIFTER 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 27 VC-A415U/H815U VC-H817U/H818U 4-24. NSTALLING 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 28 VC-A415U/H815U VC-H817U/H818U 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 29: Electrical Adjustment
VC-A415U/H815U VC-H817U/H818U 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 30 VC-A415U/H815U VC-H817U/H818U 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...
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Page 48: Block Diagram
VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 50~51...
Page 49 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U SIGNAL FLOW BLOCK DIAGRAM(VC-A415U) 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) 52~53...
Page 50 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U SIGNAL FLOW BLOCK DIAGRAM(VC-H815U/H817U/H818U) 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) 54~55...
Page 51 VC-A415U/H815U VC-H817U/H818U POWER CIRCUIT BLOCK DIAGRAM...
Page 52 VC-A415U/H815U VC-H817U/H818U 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 53: Schematic Diagram And Pwb Foil Pattern
VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 58~59...
Page 54 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 60~61...
Page 55 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 62~63...
Page 56 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 64~65...
Page 57 VC-A415U/H815U VC-H817U/H818U OPERATION CIRCUIT LOCATOR CIRCUIT(VC-H818U) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
Page 58 VC-A415U/H815U VC-H817U/H818U PWB FOIL PATTERN OPERATION PWB Component Side Wiring Side LOCATOR PWB(VC-H818U) Component Side Wiring Side...
Page 59 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U MAIN PWB Component Side 68~69...
Page 60 VC-A415U/H815U VC-A415U/H815U VC-H817U/H818U VC-H817U/H818U MAIN PWB Wiring Side 70~71...
Page 61 VC-A415U/H815U VC-H817U/H818U - M E M O -...
Page 62: 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, 3. NO. DE PIECE 4.
Page 63 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code å D926 Q501 VS2SC3052EF-1 V 2SC3052EF-1 VHD10ELS4//-1 V 10ELS4 å D928 (VC-H815U/H817U/H818U) VHDD1NS4///-1 V D1NS4 Q602 VS2SD1859TV-1 V 2SD1859TV D951 RH-EX0677GEZZ J Zener Diode D952 RH-EX0601GEZZ...
Page 64 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code C162 VCKYCY1CB473K V 0.047 16V Ceramic C358 VCKYCY1CB104K V 0.1 16V Ceramic (VC-H815U/H817U/H818U) (VC-H815U/H817U/H818U) C163 VCEA9M1HW474M V 0.47 50V Electrolytic C501 VCEA9M0JW107M V 100 6.3V Electrolytic...
Page 65 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code C673 VCEA9M0JW226M V 22 6.3V Electrolytic C789 VCKYCY1EB103K V 0.01 25V Ceramic (VC-H815U/H817U/H818U) C790 VCKYCY1HB392K V 3900p 50V Ceramic C674 VCKYCY1CF224Z V 0.22 16V Ceramic C791...
Page 66 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code R145 VRS-CY1JF000J 1/16W Metal Oxide R654 VRS-CY1JF682J V 6.8k 1/16W Metal Oxide (VC-H815U/H817U/H818U) (VC-H815U/H817U/H818U) R201 VRS-CY1JF682J V 6.8k 1/16W Metal Oxide R655 VRS-CY1JF473J V 47k 1/16W Metal Oxide...
Page 67 V 10k 1/16W Metal Oxide å F901 QFS-A3025CEZZ V Fuse, 3.0A 125V R833 VRS-CY1JF103J V 10k 1/16W Metal Oxide J201 QJAKH0011AJZZ V Jack, Rear AV(VC-A415U) AK R835 VRD-RA2BE183J V 18k 1/8W Carbon J201 QJAKL0006AJZZ V Jack, Rear AV R839 VRD-RA2BE102J...
Page 68 MISCELLANEOUS PART RMC801 RRMCU0081GEZZ J Remote Receiver P881 QPLGZ0626CEZZ V Plug, 6 Pin RMC801 RRMCU0002AJZZ V Remote Receiver SC301 QSOCN0611REN1 V Socket, 6 Pin(VC-A415U) AC SC301 QSOCN0911REN1 V Socket, 9 Pin(VC-H815U/ AD H817U/H818U) DUNTK5464TEV1(VC-H818U) SC601 QSOCN0695REZZ V Socket, 6 Pin...
Page 69 TLABM4184AJZZ V Model Label(VC-H817UC) AC TLABM4185AJZZ V Model Label(VC-H818U) SCREW, NUTS AND WASHERS TLABM4187AJZZ V Model Label(VC-H815U) TLABM4191AJZZ V Model Label(VC-A415U) TLABM4205AJZZ V Model Label(VC-H818UC) AD XBPSD26P08000 V Screw 2.6P+8S A/C Head AA TLABM4207AJZZ V Model Label(VC-H815UC) AD LX-HZ3082GEZZ J WSW 2.6+6 (AC)
Page 70 (VC-A415U) 500-1 ————— - Front Panel — (Not Replacement Item) 500-3 HDECQ1967AJSA V Casstte Flap(VC-H815U) 500-3 HDECQ1970AJSA V Casstte Flap(VC-A415U) 500-3 HDECQ2146AJSA V Casstte Flap (VC-H817U/H818U) 500-4 HDECQ1976AJSA V Window Dec.(VC-A415U) 500-4 HDECQ2148AJSA V Window Dec.(VC-H817U) AH 500-4 HDECQ2157AJSA V Window Dec.(VC-H815U) AH 500-4 HDECQ2166AJSA V Window Dec.(VC-H818U) AH...
Page 71: Exploded View Of Mechanical Parts
VC-A415U/H815U VC-H817U/H818U 11. EXPLODED VIEW OF MECHANICAL PARTS Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
Page 72 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
Page 73 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS VC-H815U/H817U/H818U VC-A415U VC-H815U/H817U/H818U VC-A415U...
Page 74 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS(VC-A415U) 500-7 500-3 500-6 500-1 500-4 500-5 502-2 502-1 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever...
Page 75 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS(VC-H815U) 500-7 500-3 500-6 500-1 500-5 500-4 502-2 502-1 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever...
Page 76 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS(VC-H817U/H818U) 500-7 500-3 500-9 500-6 500-10 500-8 500-4 500-1 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever...
Page 77: Packing Of The Set
Operation Manual(VC-H818U) TGAN-0001AJZZ Warranty Card(U.S.A. Only) RRMCG1238AJSA(VC-A415U/H815U) RRMCG1239AJSA(VC-H817U) Dry Battery RRMCG1240AJSA(VC-H818U) Infrared Remote Control Unit QCNW-8115AJZZ 75 ohm Coaxial Cable SPAKX1083AJZZ(VC-H817U/H818U) SPAKX1073AJZZ(VC-A415U/H815U) Packing Add. TLABK0005AJZZ No. Label SPAKC4262AJZZ (VC-H817U) SPAKC4263AJZZ (VC-H818U) SPAKC4265AJZZ (VC-H815U) SPAKC4269AJZZ (VC-A415U) Packing Case MARK Not Replacement Item...
Page 78 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code - M E M O -...
Page 79 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code - M E M O -...
Page 80 VC-A415U/H815U VC-H817U/H818U Ref. No. Part No. Description Code Ref. No. Part No. Description Code - M E M O -...
Page 81 Code Ref. No. Part No. Description Code COPYRIGHT C 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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Sharp VC-A415U Service Manual

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