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Sharp VC-A310X/NZ Service Manual

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(VC-A310X/NZ)
(VC-H725X)
(VC-H730X/NZ)
1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
7. ELECTRICAL TROUBLESHOOTING ................................................................................. 37
8. BLOCK DIAGRAM ............................................................................................................... 50
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 58
10. REPLACEMENT PARTS LIST ............................................................................................ 73
11. EXPLODED VIEW OF MECHANISM PARTS ..................................................................... 82
12. PACKING OF THE SET ...................................................................................................... 88
SERVICE MANUAL
MODELS
In the interests of user-safety (Required by safety regulations 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-A310X/NZ
VC-H725X
VC-H730X/NZ
VC-A310X/NZ
VC-H725X
VC-H730X/NZ
S72N5VC-A310X
Page

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  • Page 1: Table Of Contents

    VC-A310X/NZ VC-H725X VC-H730X/NZ SERVICE MANUAL S72N5VC-A310X VIDEO CASSETTE RECORDER (VC-A310X/NZ) (VC-H725X) VC-A310X/NZ (VC-H730X/NZ) VC-H725X VC-H730X/NZ MODELS In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified be used.
  • Page 2 VC-A310X/NZ VC-H725X VC-H730X/NZ 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

    Storage temperature: –20°C to 55°C Weight: Approx. 2.4 kg (VC-A310X/NZ,H725X) Approx. 2.7 kg (VC-H730X/NZ) Dimensions: 360 mm (W) x 229 mm (D) x 92 mm (H) (VC-A310X/NZ,H725X) 430 mm (W) x 227 mm (D) x 92 mm (H) (VC-H730X/NZ) VIDEO Input: 1.0 Vp-p, 75 ohm...

  • Page 4: Disassembly And Reassembly

    VC-A310X/NZ VC-H725X VC-H730X/NZ 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS (VC-A310X/NZ, H725X) : Remove 2 screws 1. TOP CABINET : Remove 2 screws 2 and 7 clips 3. FRONT PANEL : Remove 2 screws 4, 1 screw 5.
  • Page 5 VC-A310X/NZ VC-H725X VC-H730X/NZ (VC-H730X/NZ) : Remove 2 screws 1. TOP CABINET : Remove 2 screws 2 and 7 clips 3. FRONT PANEL Top Cabinet : Remove 2 screws 4, 1 screw 5, MECHANISM/ MAIN PWB and antenna terminal cover. Remove 2 screws 6 and mechanism chassis.
  • Page 6 VC-A310X/NZ VC-H725X VC-H730X/NZ 2-3 CARES WHEN REASSEMBLING Rotate the flange of worm gear by using thin stick. INSTALLING THE CASSETTE HOUSING CW • • • Loading direction When the cassette housing is installed on the mechanism, CCW • • • Ejection direction the initial setting is essential condition.

  • Page 7: Function Of Major Mechanical Parts

    VC-A310X/NZ VC-H725X VC-H730X/NZ 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head Reverse guide lever ass’y Supply pole base ass’y Reel relay gear Tension arm Take-up reel disk Idler wheel ass’y Pinch roller lever ass’y Open guide...
  • Page 8 VC-A310X/NZ VC-H725X VC-H730X/NZ FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Syncro Gear Clutch lever Master cam Limiter pulley ass’y Capstan D.D. motor Shifter Reel belt...

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

    VC-A310X/NZ VC-H725X VC-H730X/NZ 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-A310X/NZ VC-H725X VC-H730X/NZ 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 11 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-3 REMOVING AND INSTALLING THE CAS- 2. Install in the reverse order of removal. SETTE HOUSING Notes • Removal 1. In the case when you use the magnet screw driver, never 1. In the cassette removing mode, remove the cassette.
  • Page 12 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-5 REEL DISK REPLACEMENT AND HEIGHT Notes: CHECK 1. When installing the reel disk, take due care so that the • Removal tension band ass'y is not deformed and grease does no 1. Remove the cassette housing control assembly.
  • Page 13 VC-A310X/NZ VC-H725X VC-H730X/NZ 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-A310X/NZ VC-H725X VC-H730X/NZ 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 15 VC-A310X/NZ VC-H725X VC-H730X/NZ 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 main PWB, plug in the power cord. 900 - 1,200gf •...
  • Page 16 VC-A310X/NZ VC-H725X VC-H730X/NZ • Checking Tension pole adjustment driver adjusting direction 1. Set a cassette tape, push the REC button to place the unit in the SP record mode. Now check the tension pole position. 2. Visually check to see if the position of the tension pole is + 0.5...
  • Page 17 VC-A310X/NZ VC-H725X VC-H730X/NZ • 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-A310X/NZ VC-H725X VC-H730X/NZ 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 so as to ensure smooth motion of A/C head arm.
  • Page 19 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT 4-17 ADJUSTMENT OF TAPE DRIVE TRAIN 1. Tape run rough adjustment 1 Check and adjust the position of the tension pole. • Setting (See 4-12.) 2 Check and adjust the video search rewind back Azimuth screw tension.
  • Page 20 VC-A310X/NZ VC-H725X VC-H730X/NZ Notes: 1. Previously set the tracking control in the center position, and adjust the ATR signal waveform to maximum with X value adjustment nut. Thereby the tape run rough ad- justment is facilitated. 2. Especially the outlet side ATR signal waveform must have higher flatness.
  • Page 21 VC-A310X/NZ VC-H725X VC-H730X/NZ 3 Next, press the tracking button (+), (–) and change the ATR signal waveform from max to min and from PB ATR min to max. At this time adjust the height of supply Signal and take-up side guide roller with the adjustment driver (JiGDRiVERH-4) so that the ATR signal wave- form changes nearly parallel.
  • Page 22 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-19 REPLACEMENT OF DRUM D.D. MOTOR 4-18 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 set. • Removal (Perform in numerical order.) •...
  • Page 23 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-20 REPLACING THE UPPER AND LOWER 4-21 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 4-19 D.D. motor replace- 1.
  • Page 24 VC-A310X/NZ VC-H725X VC-H730X/NZ 1. Make sure that the loading arm T and S are at the Phase- 4-22 INSTALLING THE SHIFTER Matching point as shown below 2. Fix the shifter position setting part to the roading arm T Drum position setting part as shown in figure 3.
  • Page 25 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-23 INSTALLING THE MASTER CAM (AT 4-24 REPLACEMENT OF LOADING MOTOR • Removal REAR SIDE OF MECHANISM CHASSIS) 1. Make sure beforehand that the shifter is at initial posi- Apply grease tion. (Right side from bottom view) *Apply grease to 2.
  • Page 26 VC-A310X/NZ VC-H725X VC-H730X/NZ 4-25 ASSEMBLY OF CASSETTE HOUSING 1. Proof lever Proof lever spring and Holder R MSPRD0215AJFJ *Proof lever spring fixing direction designated. Figure 4-41. 2. 0pen lever, Sensor Plate and Frame R out side out side inside bottom...
  • Page 27 VC-A310X/NZ VC-H725X VC-H730X/NZ 4 Frame R, Frame L, Drive Arm R, Drive Arm L, Upper Plate. LANGF9661AJFW Top surface should be free from scratches or soil. When assemble drive lever to frame R, make sure the hole synchronize. Figure 4-44.

  • Page 28: Electrical Adjustment

    VC-A310X/NZ VC-H725X VC-H730X/NZ 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.
  • Page 29 VC-A310X/NZ VC-H725X VC-H730X/NZ SERVO CIRCUIT ADJUSTMENT ADJUSTMENT OF PAL SYSTEM SP/LP/EP SLOW TRACKING PRESET ADJUSTMENT OF HEAD SWITCHING POINT Measuring Colour TV monitor Measuring Dual-trace oscilloscope instrument instrument Colour TV monitor Mode Playback Mode Playback Cassette Self-recorded tape Cassette Alignment tape (VROFBZD)
  • Page 30 VC-A310X/NZ VC-H725X VC-H730X/NZ ADJUSTMENT OF PAL SYSTEM FV (False 6. Adjust the (]) or ([) TRACKING buttons until there is minimum or no noise appear on the screen. Vertical Sync) OF STILL PICTURE 7. Press the STOP button to return to normal mode.

  • Page 31: Mechanism Operation Flowchart And Troubleshooting Guide

    VC-A310X/NZ VC-H725X VC-H730X/NZ...
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  • Page 37: Electrical Troubleshooting

    VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 38 VC-A310X/NZ VC-H725X VC-H730X/NZ...
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  • Page 48 VC-A310X/NZ VC-H725X VC-H730X/NZ 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.
  • Page 49 VC-A310X/NZ VC-H725X VC-H730X/NZ ROM MAP MODEL VC-A310X VC-A310NZ VC-H725X VC-H730X VC-H730NZ JP39 SQ PB JP38 SLOW ATR OFF JP37 INSTANT REPLAY JP36 NTSC PB JP35 NTSC SKEW JP34 HEAD2 JP33 HEAD1 JP32 HEAD0 JP31 GAMMA JP30 LOW POWER 5MIN. JP29...

  • Page 50: Block Diagram

    VC-A310X/NZ VC-H725X VC-H730X/NZ 8. BLOCK DIAGRAM SIGNAL FLOW BLOCK DIAGRAM...
  • Page 51 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 52 VC-A310X/NZ VC-H725X VC-H730X/NZ SIGNAL FLOW BLOCK DIAGRAM (VC-A310X/NZ)
  • Page 53 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 54 VC-A310X/NZ VC-H725X VC-H730X/NZ SIGNAL FLOW BLOCK DIAGRAM (VC-H725X, H730X/NZ)
  • Page 55 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 56 VC-A310X/NZ VC-H725X VC-H730X/NZ POWER CIRCUIT BLOCK DIAGRAM...
  • Page 57 VC-A310X/NZ VC-H725X VC-H730X/NZ 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 58: Schematic Diagram And Pwb Foil Pattern

    VC-A310X/NZ VC-H725X VC-H730X/NZ 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT (1-1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 59 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 60 VC-A310X/NZ VC-H725X VC-H730X/NZ MAIN CIRCUIT (1-2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 61 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 62 VC-A310X/NZ VC-H725X VC-H730X/NZ MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 63 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 64 VC-A310X/NZ VC-H725X VC-H730X/NZ MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 65 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 66 VC-A310X/NZ VC-H725X VC-H730X/NZ MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 67 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 68 VC-A310X/NZ VC-H725X VC-H730X/NZ OPERATION CIRCUIT BACK LIGHT CIRCUIT * VOLTAGE MEASUREMENT MODE * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( PB ..Parentheses ( REC ... Without Parentheses REC ... Without Parentheses...
  • Page 69 VC-A310X/NZ VC-H725X VC-H730X/NZ NICAM/IGR CIRCUIT...
  • Page 70 VC-A310X/NZ VC-H725X VC-H730X/NZ PWB FOIL PATTERN MAIN PWB...
  • Page 71 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 72 VC-A310X/NZ VC-H725X VC-H730X/NZ OPERATION PWB BACK LIGHT PWB NICAM/IGR PWB...

  • Page 73: Replacement Parts List

    VC-A310X/NZ VC-H725X VC-H730X/NZ 10. REPLACEMENT PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS REPLACEMENT DUNTKB110TE VF/VG/VU/VV/VW MAIN Unit Parts marked with " å " are important for maintaining the safety of the set.Be sure to replace these parts with specified ones for TUNER maintaining the safety and performance of the set.
  • Page 74 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code å D901 VHDRL1N4005-1Y V RL1N4005 C203 VCCCCY1HH151JS V 150p 50V Ceramic å D902 VHDRL1N4005-1Y V RL1N4005 C204 VCKYCY1CF104ZS V 0.1 16V Ceramic å D903 VHDRL1N4005-1Y...
  • Page 75 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code C668 VCEA9M0JW336M+ V 33 6.3V Electrolytic C357 VCKYCY1CB104KS V 0.1 16V Ceramic (H725X, H730X/NZ) (H725X, H730X/NZ) C669 VCEA9M1HW105M+ V 1 50V Electrolytic C358 VCKYCY1CB104KS V 0.1...
  • Page 76 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code C774 VCEA9M1CW336M+ V 33 16V Electrolytic R203 VRS-CY1JF562JS V 5.6k 1/16W Metal Oxide AA C783 VCKYCY1HB102KS V 1000p 50V Ceramic (A310X/NZ) C784 VCKYCY1HB102KS V 1000p 50V Ceramic...
  • Page 77 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code R655 VRD-RA2BE473JY V 47k 1/8W Carbon R730 VRS-CY1JF101JS V 100 1/16W Metal Oxide AA (H725X, H730X/NZ) R731 VRS-CY1JF473JS V 47k 1/16W Metal Oxide AA R656 VRS-CY1JF682JS V 6.8k 1/16W Metal Oxide AA...
  • Page 78 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code R911 VRS-CY1JF101JS V 100 1/16W Metal Oxide AA W8002 PSHEP0349AJZZ V Deffusion Sheet R914 VRS-CY1JF224JS V 220k 1/16W Metal Oxide AA R916 VRS-CY1JF333JS V 33k 1/16W Metal Oxide AA...
  • Page 79 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1706 VCKYCY1HF103ZY V 0.01 50V Ceramic C1707 VCEA9M1CW106M+ V 10 16V Electrolytic C1708 VCEA9M0JW226M+ V 22 6.3V Electrolytic C1709 VCEA9M1AW226M+ V 22 10V Electrolytic C1710 VCCCCY1HH5R0CY V 5.0p...
  • Page 80 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS SCREW, NUTS AND WASHERS LBNDK1021AJZZ V Tension Band Ass’y XBPSD26P08000 V 2.6P+8S A/C Head LBOSZ1022AJZZ V Tension Arm Boss LX-BZ3096GEFD J Tilt Adjusting Screw...
  • Page 81 VC-A310X/NZ VC-H725X VC-H730X/NZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS SUPPLIED ACCESSORIES GCABA3169AJSW V Top Cabinet QCNW-8379AJZZ V 75 ohm Coaxial Cable (A310X/NZ, H725X) RRMCG1196AJSA V Infrared Remote Control CCABA3168TEV4 V Top Cabinet Ass’y...

  • Page 82: Exploded View Of Mechanism Parts

    VC-A310X/NZ VC-H725X VC-H730X/NZ 11. EXPLODED VIEW OF MECHANICAL PARTS MECHANISM CHASSIS PARTS...
  • Page 83 VC-A310X/NZ VC-H725X VC-H730X/NZ CASSETTE HOUSING CONTROL PARTS...
  • Page 84 VC-A310X/NZ VC-H725X VC-H730X/NZ CABINET PARTS (VC-A310X/NZ, H725X) VC-H725X VC-A310X/NZ VC-H725X only...
  • Page 85 VC-A310X/NZ VC-H725X VC-H730X/NZ CABINET PARTS (VC-H730X/NZ))
  • Page 86 VC-A310X/NZ VC-H725X VC-H730X/NZ FRONT PANEL PARTS (VC-A310X/NZ, H725X) 500-7 VC-A310X/NZ VC-H725X 500-3 Note 500-6 Note 500-1 500-5 500-4 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover Cassette cover Cassette cover open lever open lever About 45°...
  • Page 87 VC-A310X/NZ VC-H725X VC-H730X/NZ FRONT PANEL PARTS (VC-H730X/NZ) 500-3 500-7 500-1 500-6 500-2 500-8 500-5 500-4 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover Cassette cover Cassette cover open lever open lever About 45°...

  • Page 88: Packing Of The Set

    VC-A310X/NZ VC-H725X VC-H730X/NZ 12. PACKING OF THE SET Accessories Operation Manual TiNS-A033WJZZ (A310X/NZ) TiNS-A035WJZZ (H725X) TiNS-A036WJZZ (H730X/NZ) RRMCG1196AJSA (H730X/NZ) Dry Battery RRMCG1206AJSA (A310X/NZ, H725X) Infrared Remote Control Unit SPAKP0114AJZZ QCNW-8379AJZZ Foam Bag 75 ohm Coaxial Cable SPAKXA014WJZZ (H730X/NZ) SPAKXA035WJZZ (A310X/NZ, H725X) Packing Foam.
  • Page 89 VC-A310X/NZ VC-H725X VC-H730X/NZ...
  • Page 90 VC-A310X/NZ VC-H725X VC-H730X/NZ © COPYRIGHT 2002 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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