Sharp VC-A410U Service Manual
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Sharp VC-A410U Service Manual

Video cassette recorder
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Table of Contents

See also: Operating Manual
1. GENERAL INFORMATION ............................................................................................................ 5
2. DISASSEMBLY AND REASSEMBLY ............................................................................................ 7
3. FUNCTION OF MAJOR MECHANICAL PARTS ......................................................................... 10
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. REPLACEMENT PARTS LIST .................................................................................................... 73
11. EXPLODED VIEW OF MECHANICAL PARTS ............................................................................ 81
12. PACKING OF THE SET .............................................................................................................. 85
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-A410U
VC-H810U
VC-A410U/H810U
.............. Models for Canada
VC-A410U/H810U
.............. Models for U.S.A.
VC-A410U
VC-A410U
VC-H810U
VC-H810U
S20W6VC-A410U
Page

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  • Page 1: Table Of Contents

    VC-A410U VC-A410U VC-H810U VC-H810U SERVICE MANUAL S20W6VC-A410U VIDEO CASSETTE RECORDER VC-A410U VC-H810U 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-A410U VC-H810U 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-A410U VC-H810U 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-A410U VC-H810U 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-H810U • 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 6 VC-A410U VC-H810U 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...

  • Page 7: Disassembly And Reassembly

    VC-A410U VC-H810U 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 8 VC-A410U VC-H810U 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 9 VC-A410U VC-H810U 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 10: Function Of Major Mechanical Parts

    VC-A410U VC-H810U 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-A410U VC-H810U 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: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-A410U VC-H810U 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-A410U VC-H810U 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. Possible symptom Maintained 1000 1500 2000 Remarks encountered hrs. hrs. hrs. hrs. Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 14 VC-A410U VC-H810U 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 15 VC-A410U VC-H810U 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 16 VC-A410U VC-H810U 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-A410U VC-H810U 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-A410U VC-H810U 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 19 VC-A410U VC-H810U 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 0.25...
  • Page 20 VC-A410U VC-H810U • 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-A410U VC-H810U 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 22 VC-A410U VC-H810U 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 23 VC-A410U VC-H810U Notes: 4-18 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.
  • Page 24 VC-A410U VC-H810U 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 25 VC-A410U VC-H810U 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 26 VC-A410U VC-H810U 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 27 VC-A410U VC-H810U 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 28 VC-A410U VC-H810U 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 Capstan Phase-Matching point 2 as shown below.
  • Page 29 VC-A410U VC-H810U 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 30 VC-A410U VC-H810U 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 31: Electrical Adjustment

    VC-A410U VC-H810U 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 32 VC-A410U VC-H810U 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 50: Block Diagram

    VC-A410U VC-A410U VC-H810U VC-H810U 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 50~51...
  • Page 51 VC-A410U VC-A410U VC-H810U VC-H810U SIGNAL FLOW BLOCK DIAGRAM(VC-A410U) Audio playback signal E-E signal Playback luminance signal Playback chroma signal Recording luminance signal Recording chroma signal Audio recording signal E-E signal(Audio) 52~53...
  • Page 52 VC-A410U VC-A410U VC-H810U VC-H810U SIGNAL FLOW BLOCK DIAGRAM(VC-H810U) 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 53 VC-A410U VC-H810U POWER CIRCUIT BLOCK DIAGRAM...

  • Page 54: Schematic Diagram

    VC-A410U VC-H810U 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 55: Schematic Diagram And Pwb Foil Pattern

    VC-A410U VC-A410U VC-H810U VC-H810U 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 58~59...
  • Page 56 VC-A410U VC-A410U VC-H810U VC-H810U MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 60~61...
  • Page 57 VC-A410U VC-A410U VC-H810U VC-H810U MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 62~63...
  • Page 58 VC-A410U VC-A410U VC-H810U VC-H810U MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 64~65...
  • Page 59 VC-A410U VC-H810U OPERATION CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
  • Page 60 VC-A410U VC-H810U PWB FOIL PATTERN OPERATION PWB Component Side Wiring Side...
  • Page 61 VC-A410U VC-A410U VC-H810U VC-H810U MAIN PWB Component Side 68~69...
  • Page 62 VC-A410U VC-A410U VC-H810U VC-H810U MAIN PWB Wiring Side 70~71...
  • Page 63 VC-A410U VC-H810U - M E M O -...

  • Page 64: 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 65 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code Q704 VS2SA1530ARS1 V 2SA1530ARS1 PACKAGED CIRCUITS å R901 Q705 VS2SC3052EF-1 V 2SC3052EF RR-DZ0047CEZZ V 2.7M Resistor Q706 VS2SA1530ARS1 V 2SA1530ARS1 X501 RCRSB0265GEZZ J Crystal, CRSB0265GE Q710...
  • Page 66 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code C167 VCKYCY1CB104K V 0.1 16V Ceramic C512 VCKYCY1HF103Z V 0.01 50V Ceramic (VC-H810U) C513 VCKYCY1HF103Z V 0.01 50V Ceramic C168 VCEA9M1CW106M V 10 16V Electrolytic C514 VCKYCY1HF103Z V 0.01...
  • Page 67 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code å C903 C680 VCKYCY0JF105Z 6.3V Ceramic RC-KZ0147GEZZ J 3300p AC125V Ceramic (VC-H810U) å C903 C681 VCKYCY1HF103Z V 0.01 50V Ceramic RC-KZ0092GEZZ J 3300p AC125V Ceramic å C906...
  • Page 68 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code R502 VRS-CY1JF273J V 27k 1/16W Metal Oxide R674 VRS-CY1JF473J V 47k 1/16W Metal Oxide R505 VRS-CY1JF000J 1/16W Metal Oxide (VC-H810U) R511 VRS-CY1JF272J V 2.7k 1/16W Metal Oxide...
  • Page 69 1/2W Carbon SC301 QSOCN0911REN1 V Socket, 9 Pin(VC-H810U) AD å R912 VRD-RM2HD390J V 39 1/2W Carbon SC301 QSOCN0611REN1 V Socket, 6 Pin(VC-A410U) AC å R917 VRS-CY1JF562J V 5.6k 1/16W Metal Oxide SC601 QSOCN0695REZZ V Socket, 6 Pin å R918 VRS-CY1JF000J...
  • Page 70 RMOTP1151GEZZ J Drum Drive Motor S886 QSW-K0086GEZZ J Switch, Play (VC-A410U) DDRMW0029TEX1 V Upper and Lower S886 QSW-K0004AJZZ V Switch, Play Drum Ass’y(VC-A410U) S887 QSW-K0086GEZZ J Switch, Rew DDRMW0030TEX1 V Upper and Lower Drum Ass’y(VC-H810U) S887 QSW-K0004AJZZ V Switch, Rew...
  • Page 71 (VC-H810U) 500-1 ————— - Front Panel — (Not Replacement Item) 500-2 GCOVA2163AJZZ V Timer LED Cover 500-3 HDECQ2004AJSA V Cassette Flap(VC-A410U) AH 500-3 HDECQ2005AJSA V Cassette Flap(VC-H810U) AH 500-4 HDECQ2160AJSA V Window Dec. 500-5 JBTN-2943AJSB V Button, REC 500-6 HINDP2132AJSA...

  • Page 72: Exploded View Of Mechanical Parts

    VC-A410U VC-H810U 11. EXPLODED VIEW OF MECHANICAL PARTS Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
  • Page 73 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
  • Page 74 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS VC-H810U VC-A410U...
  • Page 75 VC-A410U VC-H810U Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS 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 Cassette cover...

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