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SHARP
VC-V50S/V80T
SHARP
VC-V91T
1. SPECIFICATIONS ......................................................................................................................... 2
2. DISASSEMBLY AND REASSEMBLY ............................................................................................ 3
3. FUNCTION OF MAJOR MECHANICAL PARTS ........................................................................... 6
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .......................... 8
5. ELECTRICAL ADJUSTMENT ...................................................................................................... 27
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ...................... 30
7. TROUBLESHOOTING ................................................................................................................. 36
8. BLOCK DIAGRAM ....................................................................................................................... 46
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN .................................................................. 52
10. REPLACEMENT PARTS LIST .................................................................................................... 67
11. EXPLODED VIEW OF MECHANICAL PARTS ............................................................................ 76
12. PACKING OF THE SET .............................................................................................................. 80
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 PLAYER
VC-V50S
VC-V80T
VC-V91T
VC-V50S
VC-V80T
VC-V91T
SX0K6VC-V50S/
Page
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Summary of Contents for Sharp VC-V50S
- Page 1 VC-V50S VC-V80T VC-V91T SERVICE MANUAL SX0K6VC-V50S/ VIDEO CASSETTE PLAYER SHARP VC-V50S/V80T VC-V50S SHARP VC-V80T VC-V91T VC-V91T 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-V50S VC-V80T VC-V91T 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 VC-V50S VC-V80T VC-V91T 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 7 and 2 screws 8. : Remove 3 screws 1. MECHANISM/ TOP CABINET Remove 1 screw 9 from behind of the : Remove 2 VR Knobs 2 at first(VC-...
- Page 4 PWB with care not to damage theirs urrounding parts. ANTENNA LX-HZ3087GEFN TERMINAL XEBSD30P12000 COVER XHPSD30P06WS0 ANTENNA TERMINAL VC-V80T/V91T Only COVER CASSETTE LX-HZ3087GEFN HOUSING XEBSD30P12000 H/A SHIELD CASE SHIELD PLATE VC-V50S Only MECHANISM CHASSIS LED PWB HOLDER VC-V91T Only MAIN PWB...
- Page 5 VC-V50S VC-V80T VC-V91T 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...
- Page 6 VC-V50S VC-V80T VC-V91T 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 7 VC-V50S VC-V80T VC-V91T 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 8 VC-V50S VC-V80T VC-V91T 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 9 VC-V50S VC-V80T VC-V91T 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. encountered Parts Abnormal rotation or significant Guide roller ass’y...
- Page 10 VC-V50S VC-V80T VC-V91T 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 11 VC-V50S VC-V80T VC-V91T 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 12 VC-V50S VC-V80T VC-V91T 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 13 VC-V50S VC-V80T VC-V91T 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 14 VC-V50S VC-V80T VC-V91T 4-10 CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. • After short-circuiting TP802 provided at the center Tension gauge Pinch roller (facing to the main PWB), plug in the power cord.
- Page 15 VC-V50S VC-V80T VC-V91T 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 16 VC-V50S VC-V80T VC-V91T • 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 17 VC-V50S VC-V80T VC-V91T 3. Align the left end of gear of A/C head arm with the 4-15 REPLACEMENT OF A/C (Audio/Control) punched mark of chassis, tentatively tighten the screws HEAD 1 and 2 so as to ensure smooth motion of A/C head 1.
- Page 18 VC-V50S VC-V80T VC-V91T 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 19 VC-V50S VC-V80T VC-V91T 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 envelope waveform to maximum with X 1 Remove the cassette housing control assembly.
- Page 20 VC-V50S VC-V80T VC-V91T 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 21 VC-V50S VC-V80T VC-V91T 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.
- Page 22 VC-V50S VC-V80T VC-V91T 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.
- Page 23 VC-V50S VC-V80T VC-V91T 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 24 VC-V50S VC-V80T VC-V91T 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 Capstan Phase-Matching point 2 as shown below.
- Page 25 VC-V50S VC-V80T VC-V91T 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 26 VC-V50S VC-V80T VC-V91T 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 27 VC-V50S VC-V80T VC-V91T 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 28 VC-V50S VC-V80T VC-V91T SERVO CIRCUIT ADJUSTMENT ADJUSTMENT OF FV (False Vertical Sync) OF STILL PICTURE ADJUSTMENT OF HEAD SWITCHING POINT Measuring Colour TV monitor instrument Measuring Dual-trace oscilloscope Mode Playback still instrument Cassette Self-recorded tape (PAL) Mode Playback (See Note below 1)
- Page 29 VC-V50S VC-V80T VC-V91T CHECKING OF PLAYBACK LEVEL CHECKING OF AUDIO PLAYBACK LEVEL Measuring Oscilloscope Measuring AC milli-voltmeter instrument instrument Mode Playback Mode Record/Playback Cassette Self-recorded tape (PAL) Input signal Alignment tape.(VROCPSV) (1kHz (See Note below 1) level control signal.) 1.0 ± 0.2 Vp-p...
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- Page 46 VC-V50S VC-V80T VC-V91T 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 46~47...
- Page 47 VC-V50S VC-V80T VC-V91T SIGNAL FLOW BLOCK DIAGRAM 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) 48~49...
- Page 48 VC-V50S VC-V80T VC-V91T POWER CIRCUIT BLOCK DIAGRAM...
- Page 49 VC-V50S VC-V80T VC-V91T SCHEMATIC DIAGRAM IMPORTANT SAFETY NOTICE: BE SURE TO USE GENUINE PARTS FOR SE- CURING THE SAFETY AND RELIABILITY OF THE SET. PARTS MARKED WITH " å " AND PARTS SHADED (IN BLACK) ARE ESPECIALLY IMPOR- TANT FOR MAINTAINING THE SAFETY AND PROTECTING ABILITY OF THE SET.
- Page 50 VC-V50S VC-V80T VC-V91T 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 52~53...
- Page 51 VC-V50S VC-V80T VC-V91T MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 54~55...
- Page 52 VC-V50S VC-V80T VC-V91T MAIN CIRCUIT(3) AND LED CIRCUIT(VC-V91T) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 56~57...
- Page 53 VC-V50S VC-V80T VC-V91T MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 58~59...
- Page 54 VC-V50S VC-V80T VC-V91T MAIN CIRCUIT(5) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 60~61...
- Page 55 VC-V50S VC-V80T VC-V91T OPEREATION CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
- Page 56 VC-V50S VC-V80T VC-V91T LED CIRCUIT(VC-V91T) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
- Page 57 VC-V50S VC-V80T VC-V91T PWB FOIL PATTERN MAIN PWB 64~65...
- Page 58 VC-V50S VC-V80T VC-V91T LED PWB(VC-V91T) OPERATION PWB...
- Page 59 VS2SB1117KU1E V 2SB1117KU (NOT REPLACEMENT ITEM) Q928 VSKRC103S//-1 V KRC103S Q955 VS2SB1117KU1E V 2SB1117KU Q956 VSKRC103S//-1 V KRC103S DUNTK5790TEVN - MAIN Unit(VC-V50S) — Q957 VS2SB1117KU1E V 2SB1117KU DUNTK5790TEVP - MAIN Unit(VC-V80T) — Q958 VSKRC103S//-1 V KRC103S DUNTK5790TEVQ - MAIN Unit(VC-V91T) —...
- Page 60 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code DIODES AND LED’S C209 VCKYCY1CF104Z V 0.1 16V Ceramic C210 VCKYCY1CB104K V 0.1 16V Ceramic D801 RH-PX0252GEZZ J LED, Take Up Reel Sensor AF C211 VCEA9M1HW335M V 3.3...
- Page 61 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code C513 VCKYCY1HF103Z V 0.01 50V Ceramic C676 VCEA9M1CW106M V 10 16V Electrolytic C514 VCKYCY1HF103Z V 0.01 50V Ceramic (V80T/V91T) C515 VCKYCY1HB331K V 330p 50V Ceramic C677 VCKYCY1CF334Z V 0.33...
- Page 62 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code C921 RC-QZ0107GEZZ J 560p 100V Mylar C6142 VCEAEM1CW336M V 33 16V Electrolytic C922 VCEAVA1VN477M V 470 35V Electrolytic (V91T) C923 VCEAGA1CW108M V 1000 16V Electrolytic...
- Page 63 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code R353 VRS-CY1JF272J V 2.7k 1/16W Metal Oxide R680 VRD-RA2BE561J V 560 1/8W Carbon (V80T/V91T) (V80T/V91T) R354 VRS-CY1JF471J V 470 1/16W Metal Oxide R693 VRD-RA2BE471J V 470 1/8W Carbon...
- Page 64 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code R882 VRS-CY1JF181J V 180 1/16W Metal Oxide R6125 VRS-CY1JF223J V 22k 1/16W Metal Oxide R885 VRS-CY1JF391J V 390 1/16W Metal Oxide (V91T) R886 VRS-CY1JF391J V 390 1/16W Metal Oxide...
- Page 65 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code R6172 VRS-CY1JF564J V 560k 1/16W Metal Oxide SC602 QSOCZ0293GEZZ J Socket, 2 Pin (V91T) SC701 QSOCN0704REN1 V Socket, 7 Pin R6175 VRS-CY1JF000J 1/16W Metal Oxide...
- Page 66 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS SCREW, NUTS AND WASHERS XBPSD26P08000 V Screw 2.6P+8S A/C Head AA LBNDK1011AJZZ V Tension Band Ass’y LX-HZ3082GEZZ J WSW2.6+6(AC) LBOSZ1007AJZZ V Tension Arm boss XHPSD26P06000 V Screw, 2.6P+6S...
- Page 67 CPNLC2662TEV2 V Front Panel Ass’y(V91T) GCOVA2056AJZZ V LED Cover 500-1 ———— - Front Panel — (Not Replacement Item) HBDGB1008AJSA V SHARP Badge HiNDP2111AJSA V Indication Plate (V80T/V91T) HiNDP2109AJSB V Indication Plate(V50S) MSPRD0103AJFJ V Cassette Spring HDECQ2107AJSB V Window Decoration(V50S) AK...
- Page 68 VC-V50S VC-V80T VC-V91T Ref. No. 11. EXPLODED VIEW OF MECHANICAL PARTS Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
- Page 69 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
- Page 70 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS V50S V80T/V91T *1 VC-V91T *2 VC-V50S/V80T...
- Page 71 Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS 500-1 *1 VC-V91T *2 VC-V50S/V80T (non-karaoke) *3 VC-V80T/V91T PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover Cassette cover open lever Cassette cover...
- Page 72 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code 12. PACKING OF THE SET Accessories TiNS-3819AJZZ Operation Manual(V50S) TiNS-3820AJZZ Operation Manual(V80T) TiNS-3821AJZZ Operation Manual(V91T) RMiCD0014GEZZ Microphone(V91T) QCNW-8379AJZZ 75 ohm Coaxial Cable Battery SSAKA0001AJZZ Polyethylene Bag...
- Page 73 VC-V50S VC-V80T VC-V91T Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
- Page 74 Code Ref. No. Part No. Description Code COPYRIGHT C 2001 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.