Sharp XA-920 Service Manual
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Sharp XA-920 Service Manual

Sharp XA-920 Service Manual

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XA-905
XA-920
1. GENERAL INFORMATION............................................................................................................ 4
2. DISASSEMBLY AND REASSEMBLY ............................................................................................ 6
3. FUNCTION OF MAJOR MECHANICAL PARTS ........................................................................... 9
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. PARTS LIST ................................................................................................................................ 73
11. EXPLODED VIEW OF MECHANICAL PARTS ............................................................................ 81
12. PACKING OF THE SET .............................................................................................................. 86
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
PROFESSIONAL SERIES
VIDEO CASSETTE RECORDER
XA-905
XA-905
XA-920
XA-920
S80E5XA-905//
XA-905
XA-920
Page

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  • Page 1: Table Of Contents

    XA-905 XA-905 XA-920 XA-920 SERVICE MANUAL S80E5XA-905// PROFESSIONAL SERIES VIDEO CASSETTE RECORDER XA-905 XA-905 XA-920 MODELS XA-920 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 XA-905 XA-920 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. Before returning the video cassette recorder to the user, Any reading of 0.45V rms (this corresponds to 0.3mA...
  • Page 3 XA-905 XA-920 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 4: General Information

    Power Consumption: 18 W Dimensions (approx.): 360 (W) x 92.5 (H) x 262.5 (D) mm (14-3/16" x 3-41/64" x 10-21/64") (XA-905) 360 (W) x 92.5 (H) x 263.5 (D) mm (14-3/16" x 3-41/64" x 10-3/8") (XA-920) Weight (approx.): 2.8 kg (6.2 lbs) Accessories included: 75 ohm coaxial cable, Operation manual, Infrared remote control, Battery (2 pcs.),...
  • Page 5 XA-905 XA-920 1-3. LOCATION OF MAJOR COMPONENTS AND CONTROL...

  • Page 6: Disassembly And Reassembly

    XA-905 XA-920 2. DISASSEMBLY AND REASSEMBLY 2-1. DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. : Remove 3 screws e, 1 screw r, 2 TOP CABINET PAUSE JACK : Remove button 2. clips t with Pause Jack PWB and FRONT PANEL Remove 2 screws 3 and 7 clips 4.
  • Page 7 XA-905 XA-920 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 8 XA-905 XA-920 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 9: Function Of Major Mechanical Parts

    XA-905 XA-920 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 10 XA-905 XA-920 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 11: Adjustment, Replacement And Assembly Of Mechanical Units

    XA-905 XA-920 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 12 XA-905 XA-920 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. 1000 1500 2000 Possible symptom Maintained Remarks hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 13 XA-905 XA-920 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 14 XA-905 XA-920 4-5. REEL DISK REPLACEMENT AND 4. Assemble the Supply main brake ass'y. HEIGHT 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 15 XA-905 XA-920 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 16 XA-905 XA-920 Notes: 4-9. CHECKING ADJUSTMENT 1. Hold the torque gauge by hand so that it is not moved. TAKE-UP TORQUE IN VIDEO SEARCH 2. Do not keep the reel disk in lock state. Do not allow long- REWIND MODE time measurement.

  • Page 17: Tension Pole Position

    XA-905 XA-920 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 18 XA-905 XA-920 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 19 XA-905 XA-920 • 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 20 XA-905 XA-920 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 21 XA-905 XA-920 4-16. A/C HEAD HEIGHT ROUGH AD- 4-17. HEIGHT ADJUSTMENT OF REVERSE JUSTMENT GUIDE 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 22 XA-905 XA-920 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 23 XA-905 XA-920 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 24 XA-905 XA-920 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 25 XA-905 XA-920 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 26 XA-905 XA-920 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 27 XA-905 XA-920 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 28 XA-905 XA-920 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 29 XA-905 XA-920 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 30: Electrical Adjustment

    XA-905 XA-920 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 31 XA-905 XA-920 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 49 XA-905 XA-920 - M E M O -...

  • Page 50: Block Diagram

    XA-905 XA-905 XA-920 XA-920 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 50~51...
  • Page 51 XA-905 XA-905 XA-920 XA-920 SIGNAL FLOW BLOCK DIAGRAM(XA-905) 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 52 XA-905 XA-905 XA-920 XA-920 Playback luminance signal Playback chroma signal Audio playback signal E-E signal SIGNAL FLOW BLOCK DIAGRAM(XA-920) Audio recording signal E-E signal(Audio) Recording luminance signal Recording chroma signal 54~55...
  • Page 53 XA-905 XA-920 POWER CIRCUIT BLOCK DIAGRAM...

  • Page 54: Schematic Diagram

    XA-905 XA-920 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

    XA-905 XA-905 XA-920 XA-920 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 58~59...
  • Page 56 XA-905 XA-905 XA-920 XA-920 MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 60~61...
  • Page 57 XA-905 XA-905 XA-920 XA-920 MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 62~63...
  • Page 58 XA-905 XA-905 XA-920 XA-920 MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses 64~65...
  • Page 59 XA-905 XA-920 OPERATION CIRCUIT PAUSE JACK CIRCUIT VIDEO JACK CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ..Without Parentheses...
  • Page 60 XA-905 XA-920 PWB FOIL PATTERN OPERATION PWB Component Side Wiring Side VIDEO JACK PWB Component Side Wiring Side PAUSE JACK PWB Wiring Side Component Side...
  • Page 61 XA-905 XA-905 XA-920 XA-920 MAIN PWB Component Side 68~69...
  • Page 62 XA-905 XA-905 XA-920 XA-920 MAIN PWB Wiring Side 70~71...
  • Page 63 XA-905 XA-920 - M E M O -...

  • Page 64: Parts List

    IC801 VHiMN12511/-1 V MN12511 3. PART NO. 4. DESCRIPTION IC903 VHiKiA431//-1 V KiA431 In USA: Contact your nearest SHARP Parts Distributor to order. TRANSISTORS For location of SHARP Parts Distributor, Q251 VS2SA1530ARS1 V 2SA1530ARS1 Q302 VS2SD1306-E-1 V VS2SD1306-E Please CallToll-free;...
  • Page 65 L351 VP-2K101K0000 V Peaking, 100µH C210 VCKYCY1CF104Z V 0.1 16V Ceramic C211 VCEA9M1HW335M V 3.3 50V Electrolytic L351 VP-MK101K0000 V Peaking, 100µH(XA-920) C212 VCEA9M1CW106M V 10 16V Electrolytic L503 VP-XF120K0000 V Peaking, 12µH C213 VCEA9M1HW225M V 2.2 50V Electrolytic L602 VP-DF221K0000 V Peaking, 220µH...
  • Page 66 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C226 VCEA9M0JW107M V 100 6.3V Electrolytic C651 VCEA9M1HW475M V 4.7 50V Electrolytic C227 VCKYCY0JF105Z 6.3V Ceramic (XA-920) C228 VCEA9M0JW107M V 100 6.3V Electrolytic C652 VCEA9M0JW336M V 33 6.3V Electrolytic...
  • Page 67 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code RESISTORS C737 VCKYCY1HF103Z V 0.01 50V Ceramic C738 VCKYCY1HB102K V 1000p 50V Ceramic JA566 QJUM-1001GEFW V Jumper — C739 VCKYCY1HB102K V 1000p 50V Ceramic RJ102 VRS-CY1JF000J...
  • Page 68 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R686 VRS-CY1JF102J V 1k 1/16W Metal Oxide R610 VRS-CY1JF183J V 18k 1/16W Metal Oxide (XA-920) (XA-905) R690 VRS-CY1JF000J 1/16W Metal Oxide R611 VRS-CY1JF153J V 15k 1/16W Metal Oxide...
  • Page 69 V 470k 1/8W Carbon J201 QJAKH0012AJZZ V Jack(XA-920) R856 VRD-RA2BE102J V 1k 1/8W Carbon J202 QJAKG0006AJZZ V Jack, Front AV Jack(XA-920) AH (XA-920) P203 QPLGN0447REZZ V Plug, 4 Pin R857 VRS-CY1JF102J V 1k 1/16W Metal Oxide P804 QPLGN0447REZZ V Plug, 4 Pin...
  • Page 70 RMOTP1151GEZZ J Drum Drive Motor (XA-905) DDRMW0029TEX1 V Upper and Lower SWITCH Drum Ass’y(XA-905) S8801 QSW-S0242GEZZ J Switch, Override DDRMW0030TEX1 V Upper and Lower Drum Ass’y(XA-920) MISCELLANEOUS PARTS QBRSK0041GEZZ J Drum Earth Brush J8801 QJAKJ0007TAZZ V Jack XBPSD26P05J00 V Drum Drive Motor J8802...
  • Page 71 CPNLC2814TEV1 V Front Panel Ass’y (XA-905) 500-1 ————— - Front Panel — (Not Replacement Item) 500-3 HDECQ2255AJSA V Casstte Flap(XA-920) 500-3 HDECQ2245AJSA V Casstte Flap(XA-905) 500-4 HDECQ1976AJSC V Window Dec.(XA-905) 500-4 HDECQ2157AJSB V Window Dec.(XA-920) 500-5 JBTN-2940AJSB V REC Button(XA-920)

  • Page 72: Exploded View Of Mechanical Parts

    XA-905 XA-920 11. EXPLODED VIEW OF MECHANICAL PARTS Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
  • Page 73 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
  • Page 74 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS 602-1 XA-905 XA-920 XA-920 XA-905...
  • Page 75 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS(XA-905) 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 76 XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code FRONT PANEL PARTS(XA-920) 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 77: Packing Of The Set

    Part No. Description Code 12. PACKING OF THE SET Setting position of the Knobs RF conv. CH. preset at "3" channel Accessories TiNS-3786AJZZ Operation Manual(XA-920) TiNS-3785AJZZ Operation Manual(XA-905) TGAN-0001AJZZ Warranty Card(U.S.A. Only) Dry Battery RRMCG1264AJSA(XA-920) RRMCG1263AJSA(XA-905) Infrared Remote Control Unit QCNW-8115AJZZ...

  • Page 78: Xa-905 Xa

    XA-905 XA-920 Ref. No. Part No. Description Code Ref. No. Part No. Description Code...

  • Page 79: Xa-920 Xa

    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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