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Sharp VC-H800X Service Manual

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1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 32
7. TROUBLESHOOTING ........................................................................................................ 38
8. BLOCK DIAGRAM ............................................................................................................... 53
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 62
10. REPLACEMENT PARTS LIST ............................................................................................ 82
11. EXPLODED VIEW ............................................................................................................... 92
12. PACKING OF THE SET ...................................................................................................... 96
SERVICE MANUAL
MODEL
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-H800X
VC-H800X
SY9S8VC-H800X
Page

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Summary of Contents for Sharp VC-H800X

  • Page 1: Table Of Contents

    VC-H800X SERVICE MANUAL SY9S8VC-H800X VIDEO CASSETTE RECORDER VC-H800X MODEL 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-H800X 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 Colour or monochrome (CCiR system B/G ) 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) 160 min max.

  • Page 4: Disassembly And Reassembly

    VC-H800X 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 1 screw w and Shield Angle. : Remove 4 screws 1. MECHANISM/ TOP CABINET Remove 2 screws e and 4screws : Remove 2 screws 2 and 7 clips...
  • Page 5 VC-H800X 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 the antenna cover 1 screw 1, and remove the Remove 2 screws 4 fixing the cassette housing to the mechanism, and remove the cassette housing.
  • Page 6 VC-H800X 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-H800X 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-H800X FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Slow brake Clutch lever Master cam Limiter pulley ass'y Capstan D.D. motor Casecon drive gear Reel belt Shifter...

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

    VC-H800X 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-H800X 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 hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 11 VC-H800X 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-H800X 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-H800X 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-H800X 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-H800X 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-H800X 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-H800X • 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-H800X 3. Align the left end of gear of A/C head plate with the REPLACEMENT OF A/C (Audio/Control) HEAD 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-H800X 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-H800X 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-H800X 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-H800X REPLACEMENT OF DRUM D.D. MOTOR 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 Page 5 item 1. When removing the mechanism from the •...
  • Page 23 VC-H800X 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-H800X 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. drive cam aligns with the dent of pinch drive lever assembly.
  • Page 25 VC-H800X 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-H800X 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-H800X 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 28 VC-H800X ADJUSTMENT OF VCO CIRCUIT Measuring Colour TV monitor instrument DC voltmeter RF signal at E12-CH (by VHF Mode signal generator) Test point Pin(1)(AF1) of TP101. Pin(4)(GND.) of TP101. Control T1601 VCO control Specification 2.5±0.5V 1. Set VCR to Power On mode.
  • Page 29 VC-H800X ADJUSTMENT OF PAL SYSTEM FV (False 6. Look at the monitor screen and adjust the (]) or ([) TRACKING buttons so that the there is noise disap- Vertical Sync) OF STILL PICTURE pears from the screen. Measuring Colour TV monitor 7.
  • Page 30 VC-H800X SERVO CIRCUIT ADJUSTMENT CH-1: 1V/div 50µs/div ADJUSTMENT OF HEAD SWITCHING POINT CH-2: 2V/div 50µs/div CH-2 VIDEO OUT Measuring Dual-trace oscilloscope instrument Colour TV monitor Mode Playback 6.5 ± 0.5H (lines) CH-1 V-sync. HEAD Cassette Alignment tape (VROCPSV) SWITCHING PULSE Test point Pin(2) of P201 (H.SW.P.) to CH-1,...

  • Page 31: Electrical Adjustment

    VC-H800X 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.
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  • Page 38 VC-H800X ROM MAP MODEL VC-H800X EP n ∗ ∗ NTSC Luminance level EP n ∗ ∗ NTSC Chrominance level SP n ∗ ∗ NTSC Luminance level SP n ∗ ∗ NTSC Chrominance level LP p ∗ ∗ PAL Luminance level LP p ∗...
  • Page 39 VC-H800X 2. Memory recording preset level reprogramming. 1. Similarly to the above step 1-1 and 2 the same operate. 2. Using the CHANNEL (+) AND (-) buttons, select the right function numbers continued from recording preset number as has been JP0~J39, which appear in the fluorescent display tube, referring to the E PROM map.
  • Page 40 VC-H800X 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 therefore necessary to reprogram the memory function for the model in question.
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  • Page 53: Block Diagram

    VC-H800X 8. BLOCK DIAGRAM POWER CIRCUIT BLOCK DIAGRAM...
  • Page 54 VC-H800X VC-H800X SYSTEM SERVO BLOCK DIAGRAM...
  • Page 55 VC-H800X VC-H800X SIGNAL FLOW BLOCK DIAGRAM PB Chrominance Signal E-E Signal PB Luminance Signal REC Chrominance Signal REC Luminance Signal...
  • Page 56 VC-H800X VC-H800X AUDIO BLOCK DIAGRAM PB Audio Signal EE Signal REC Audio Signal...
  • Page 57 VC-H800X DOLBY BLOCK DIAGRAM...
  • Page 58 VC-H800X SCHEMATIC DIAGRAM IMPORTANT SAFETY NOTICE: BE SURE TO USE GENUINE PARTS FOR SE- CURING THE SAFETY AND RELIABILITY OF THE SET. å " AND PARTS PARTS MARKED WITH " SHADED (IN BLACK) ARE ESPECIALLY IMPOR- TANT FOR MAINTAINING THE SAFETY AND PROTECTING ABILITY OF THE SET.

  • Page 59: Schematic Diagram And Pwb Foil Pattern

    VC-H800X VC-H800X 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN IGR CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 60 VC-H800X DOLBY CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 61 VC-H800X OPERATION CIRCUIT...
  • Page 62 VC-H800X F AV CIRCUIT...
  • Page 63 VC-H800X JACK CIRCUIT...
  • Page 64 VC-H800X VC-H800X IF CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 65 VC-H800X VC-H800X MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 66 VC-H800X VC-H800X MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 67 VC-H800X VC-H800X MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 68 VC-H800X VC-H800X MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 69 VC-H800X PWB FOIL PATTERN IGR PWB DOLBY PWB IF PWB JACK PWB...
  • Page 70 VC-H800X OPERATION PWB F AV PWB...
  • Page 71 VC-H800X VC-H800X MAIN PWB...

  • Page 72: Replacement Parts List

    VC-H800X 10. REPLACEMENT PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS REPLACEMENT COILS AND TRANSFORMERS CF1901 RFILC0063CEZZ V Filter T1901 RCILI0089GEZZ J IF Coil Parts marked with " å " are important for maintaining the safety of...
  • Page 73 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code C6406 VCKYCY1EF104Z V 0.1 25V Ceramic R6501 VRS-CY1JF103J V 10k 1/16W Metal Oxide AA C6407 VCEAEM1CW106M V 10 16V Electrolytic R6502 VRS-CY1JF393J V 39k 1/16W Metal Oxide AA...
  • Page 74 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code RESISTORS R895 VRD-RA2BE221J V 220 1/8W Carbon R2202 VRD-RA2BE101J V 100 1/8W Carbon R1601 VRS-CY1JF101J V 100 1/16W Metal Oxide AA R1602 VRS-CY1JF000J V 00 1/16W Metal Oxide AA...
  • Page 75 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code Q712 VS2SA1530ARS1 V 2SA1530ARS Q702 RH-PX0233GEZZ J PT493FL2 Q802 VS2SC2712Y/-1 V 2SC2712Y Q853 VSKRA103S//-1 V KRA103S PACKAGED CIRCUITS Q854 VSKRA103S//-1 V KRA103S å VA901 RH-VX0048CEZZ V Varistor å...
  • Page 76 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code C227 VCKYCY0JF105Z 6.3V Ceramic C637 VCKYCY1EB103K V 0.01 25V Ceramic C251 VCEA9M1CW476M V 47 16V Electrolytic C638 VCKYCY1EB103K V 0.01 25V Ceramic C252 VCEA0A0JW337M V 330 6.3V Electrolytic...
  • Page 77 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code C750 VCKYD41CY103N V 0.01 16V Ceramic C992 VCEA9M1CW226M V 22 16V Electrolytic C751 VCKYD41CY103N V 0.01 16V Ceramic C993 VCEA9M1CW476M V 47 16V Electrolytic C752 VCEA2A1VW337M V 330...
  • Page 78 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code R636 VRS-CY1JF101J V 100 1/16W Metal Oxide AA R739 VRD-RA2BE271J V 270 1/8W Carbon R637 VRS-CY1JF000J V 00 1/16W Metal Oxide AA R740 VRD-RA2BE104J V 100k 1/8W Carbon...
  • Page 79 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code R863 VRS-CY1JF102J V 1k 1/16W Metal Oxide AA R7701 VRS-CY1JF223J V 22k 1/16W Metal Oxide AA R864 VRS-CY1JF102J V 1k 1/16W Metal Oxide AA R7704 VRS-CY1JF473J V 47k 1/16W Metal Oxide AA...
  • Page 80 V Front Panel Ass’y XBPSD30P08J00 V Drum Base Mounting 501-1 - Front Panel — Screw (SW 3P+8S) 501-2 HBDGB3032AJSA V SHARP Badge LX-WZ1098GE00 J CW 2.6-4.7-0.5 RED 501-3 HDECQ2061AJSA V Cassette Flap LX-BZ3096GEFD J Tilt Adjusting Screw 501-4 HDECQ1914AJSA V Cassette Flap Dec.
  • Page 81 VC-H800X Ref. No. Part No. Description Code Ref. No. Part No. Description Code 501-12 HDECQ1908AJSA V GAMMA LED Dec. 501-13 HDECQ1909AJSA V DISPLAY LED Dec. 501-14 MSPRD0103AJFJ V Cassette Spring XEBSD26P08000 V Screw QSW-Z0071GEZZ V Switch JBTN-2972AJSA V Button, PLAY...

  • Page 82: Exploded View

    VC-H800X 11. EXPLODED VIEW MECHANISM CHASSIS EXPLODED VIEW...
  • Page 83 VC-H800X CASSETTE HOUSING CONTROL EXPLODED VIEW...
  • Page 84 VC-H800X MECHANICAL EXPLODED VIEW...
  • Page 85 VC-H800X FRONT PANEL EXPLODED VIEW 501-14 501-3 501-4 501-12 501-10 501-13 501-11 501-4 501-1 501-8 501-2 501-6 501-7 501-9 501-5 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover Cassette cover Cassette cover...

  • Page 86: Packing Of The Set

    VC-H800X 12. PACKING OF THE SET Accessories TiNS-3634AJZZ Operation Manual TGAN-0068PEZZ Guarantee Card Dry Battery RRMCG1193AJSA Infrared Remote Control Unit SSAKA0001AJZZ Polyethylene Bag QCNW-0323AJZZ SPAKP0030AJZZ 75 ohm Coaxial Cable Form Bag SPAKX1058AJZZ Packing Foam TLABK0005AJZZ No. Label SPAKC4164AJZZ Packing Case...

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