Sharp VC-MH75HM Service Manual
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Sharp VC-MH75HM Service Manual

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1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 6
5. ELECTRICAL ADJUSTMENT ............................................................................................. 27
7. ELECTRICAL TROUBLESHOOTING ................................................................................. 40
8. BLOCK DIAGRAM ............................................................................................................... 56
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 64
10. REPLACEMENT PARTS LIST ............................................................................................ 82
11. EXPLODED VIEW OF MECHANISM PARTS ..................................................................... 90
12. PACKING OF THE SET ...................................................................................................... 94
SERVICE MANUAL
VC-MH75HM
MODEL
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-MH75HM
S23X7VC-MH75H
Page

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  • Page 1: Table Of Contents

    VC-MH75HM SERVICE MANUAL S23X7VC-MH75H VIDEO CASSETTE RECORDER VC-MH75HM MODEL 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 Page 1.

  • Page 2: Disassembly And Reassembly

    VC-MH75HM 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. TOP CABINET : Remove 2 screws 2 and 7 clips 3. FRONT PANEL TOP CABINET : Remove 2 screw 4, 1 screw 5. MECHANISM/ Remove 2 screws 6 and 2 screws 7 MAIN PWB with antenna terminal cover.
  • Page 3 VC-MH75HM 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 Drum ass'y...

  • Page 4: Function Of Major Mechanical Parts

    VC-MH75HM 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 5: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-MH75HM 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 6 VC-MH75HM 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. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
  • Page 7 VC-MH75HM 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 8 VC-MH75HM 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 9 VC-MH75HM 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 10 VC-MH75HM 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 11 VC-MH75HM 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 • Checking 1.
  • Page 12 VC-MH75HM • 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 13 VC-MH75HM • 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 14 VC-MH75HM 4-15 REPLACEMENT OF A/C (AUDIO/CONTROL) 3. Align the left end of gear of A/C head arm with the punched mark of chassis, tentatively tighten the screws HEAD 1 so as to ensure smooth motion of A/C head arm. 1. In eject position unplug the power cord.
  • Page 15 VC-MH75HM 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 16 VC-MH75HM 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 17 VC-MH75HM 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 18 VC-MH75HM 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 19 VC-MH75HM 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 20 VC-MH75HM 4-22 INSTALLING THE SHIFTER 1. Make sure that the loading arm T and S are at the Phase- 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 21 VC-MH75HM 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 22 VC-MH75HM 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 T a k e c a r e t h a t n o t t o d a m a g e t h i s p a r t s .
  • Page 23 VC-MH75HM 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 24: Electrical Adjustment

    VC-MH75HM 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 25 VC-MH75HM ADJUSTMENT OF PAL SYSTEM FV (False SERVO CIRCUIT ADJUSTMENT Vertical Sync) OF STILL PICTURE ADJUSTMENT OF HEAD SWITCHING POINT Measuring Colour TV monitor instrument Measuring Dual-trace oscilloscope instrument Colour TV monitor Mode Playback still Mode Playback Cassette Self-recorded tape (SP/LP,EP mode)
  • Page 26 VC-MH75HM CHECKING OF PLAYBACK LEVEL CHECKING OF AUDIO RECORD LEVEL Measuring AC milli-voltmeter Measuring Oscilloscope instrument instrument Mode Record/playback Mode Record/Playback Input signal 1kHz, –8.0 dBs Cassette Self-recorded tape (See Note below 2) Test point AUDIO OUT jack Specification 1.0±0.2Vp-p –8.0 ±...
  • Page 27 VC-MH75HM ADJUSTMENT OF Deviation Confirmation Y/C CIRCUIT ADJUSTMENT Measuring Spectrum ADJUSTMENT OF EE Level Confirmation instrument Analyzer Measuring Osiloscope Mode Record instrument Cassette Self-recorded tape Mode Record Test point YC CHIP Pin98 Cassette Self-recorded tape (SP/EP mode)(See Note below) VIDEO...
  • Page 28 VC-MH75HM ADJUSTMENT OF PB Level Confirmation HIFI Audio Circuit ADJUSTMENT ADJUSTMENT OF EE Level Confirmation HIFI Measuring Osiloscope Lch, Rch instrument Measuring Voltmeter Mode Playback instrument Cassette Self-recorded/Playback tape Mode Test point VIDEO OUT port Cassette Optional (75Ω terminal) Test point...
  • Page 29 VC-MH75HM ADJUSTMENT OF LINE3(FRONT) INPUT ADJUSTMENT OF Receive Image CH Level Confirmation HIFI Lch, Rch Measuring Voltmeter Mode instrument Mode Confirm that there is no noise and beat in the receiving strenght and weakness electrics signal. Cassette Self-recorded tape TIMER Circuit ADJUSTMENT...
  • Page 30 VC-MH75HM Power Circuit ADJUSTMENT ADJUSTMENT OF Power Consumption Con- firmation ADJUSTMENT OF Output Voltage Confirm Measuring Digital Voltmeter Measuring Power Consumption device instrument instrument Mode Power off Item Test point Specification Fix Load Fix Load actual load AT 12V AT between 12Vline~GND DC 12.5V±0.3V...

  • Page 31: Mechanism Operation Flowchart And Troubleshooting Guide

    6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE MECHANISM OPERATION FLOWCHART CASSETTE INSERTION STOP * This flowchart describes the outline of the mechanism’s operation, but does not give its details. STILL CS/EJ SLOW STOP Cassette is ejected and loading Mecha Mode motor stops.
  • Page 32 STOP REC/PLAY PLAY STILL PLAY PLAY Press REW key. Press REC/PLAY key. Press STILL key. Press PLAY Key. Loading motor turns reverse Loading motor turns forward Loading motor turns in Capstan motor turns direction and master cam forward direction and master direction and master cam counterclockwise.
  • Page 33 STOP FF/REW STOP CASSETTE EJECT Press FF/REW key. Press EJECT key. Loading motor rotate forward. Loading motor turns in reverse direction and master cam clockwise. Mode SW is at FF/REW Tape position. Capstan motor turns in reverse direction. unloading Loading Motor stop rotate. Mode switch is at UL position.
  • Page 34 MECHANISM TROUBLESHOOTING 1. FF/REW FAILURE (NO TAPE WINDING) 2. REC/PLAY FAILURE (MODE RELEASE) Press FF key. Is master cam at Does loading Is voltage applied Voltage supply Is the master cam Does loading Is voltage applied Voltage supply FF position ? motor operate ? to loading motor ? system in trouble.
  • Page 35 3. WINDING FAILURE AT VSR 4. UNUSUAL SOUND IN EACH MODE 4-i) Unusual sound in cassette insertion and ejection mode Go to 2. REC/ Is Playback PLAY FAILURE function normal ? routine. Is unusal sound heard during Replace cassette control ass’y. Press REW key.
  • Page 36 4-ii) Unusual sound in FF/REW mode Adjust reel disk height. Is reel disk height as specified ? Check reel disk and main chassis. Thrust gap found at reel disk ? And replace defective parts. Drive system out of contact with any Rearrange the parts on main PWB.

  • Page 37: Electrical Troubleshooting

    7. ELECTRICAL TROUBLESHOOTING FLOW CHART NO.1 POWER TROUBLESHOOTING(1) FLOW CHART NO.4 POWER TROUBLESHOOTING(4) No power. In case of output voltage at low level. Check whether the secondary side The fuse blows out even when it is replaced with new one. photocoupler circuit operates normally.
  • Page 38 FLOW CHART NO.8 INFRARED R/C TROUBLESHOOTING FLOW CHART NO.6 POWER TROUBLESHOOTING(6) No operation is possible from the infrared remote control. In case of output voltage at low level. Replace infrared remote control as Does the infrared remote control The result of IC901, IC903, C9336, R932,R930 and required.
  • Page 39 FLOW CHART NO.10 CASSETTE CONTROL TROUBLESHOOTING(2) FLOW CHART NO.12 CAPSTAN MOTOR TROUBLESHOOTING A cassette tape is taken in, but ejected at once. The capstan motor fails to run. Does the start sensor pulse at pin (87) Check line between start sensor and pin Is the voltage more than about 2.6V Check IC701.
  • Page 40 FLOW CHART NO.15 DRUM MOTOR TROUBLESHOOTING(2) FLOW CHART NO.13 TIMER TROUBLESHOOTING The LCD display fails to light up. The drum motor runs only for a few seconds. Replace IC on mechanism. Is the supply voltage of 5V fed to Check AT 5V line. pin(37) of IC8001? Check peripheral circuit of IC on Is drum PG signal given out from the...
  • Page 41 FLOW CHART NO.18 CAPSTAN SERVO TROUBLESHOOTING FLOW CHART NO.17 DRUM SERVO TROUBLESHOOTING Capstan servo does not function. Drum servo does not function. Only PB mode inoperative Only REC mode inoperative Are REC and/or PB mode inoperative? Is there 14.318MHz oscillation at Check peripheral circuit of X701.
  • Page 42 FLOW CHART NO.19 E-E MODE TROUBLESHOOTING No picture E-E signal. (by pass) Check the line between pin(24) of TU101 and pin(31) of IC201. Check the line between external video input terminal (J201) and Is picture signal input into the pins(31) and (32) of IC201? pin(31) of IC201.
  • Page 43 FLOW CHART NO.20 RECORDING MODE TROUBLESHOOTING Picture (Luminance) record is impossible (E-E mode is possible). Although picture record is possible, color does not appear in PAL or NTSC mode (E-E mode is possible). Is luminance signal (approx. 0.5Vp-p) Check between the pins(18) and (19) Is voltage 5V applied to the chroma section Check peripheral of pin(61) of IC201 input to the pin(19) of IC201?
  • Page 44 FLOW CHART NO.21 Hi-Fi SOUND MODE TROUBLESHOOTING(1) No Hi-Fi E-E sound heard <For Hi-Fi mode> <For normal mode> Is there audio signal inputted at each input Check line ranging from pins (31),(30) of Is there audio signal inputted at each input terminal as shown in table? IC1701 (NICAM/GR), to the each input terminal of IC201 as shown in table?
  • Page 45 FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2) No HI-FI sound recording(E-E mode is posible). Check peripheral circuit of IC651 as Replace IC651. shown in table. L-ch pins (16),(17),(18),(19) R-ch pins (32),(33),(34),(35) Check PC 5V lines. Is there a REC FM signal outputted Is the supply voltage of 5V fed to pin at the IC651 pins(29) to (24) (CH-1) (25) of IC651?
  • Page 46 FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2)
  • Page 49 VC-MH75HM 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 50 VC-MH75HM 4. Jumper setting of JP0 to JP39 in hexadecimal notation and REC current setting. a. Check the power on. (Power is ON) b. Make short circuit test point(TP801) and hold the point. Be sure that all the LCD display light up into the TEST mode.
  • Page 51 VC-MH75HM ROM MAP MODEL MH75HM PAL SP PAL LP SECAM SP SECAM LP IC701 iXA045WJ JP39 A.DUB JP38 NOT SLOW ATR JP37 S.SIMPLE PB JP36 NTPB JP35 NTSC SKEW JP34 HEAD 2 JP33 HEAD 1 JP32 HEAD 0 JP31 GAMMA...

  • Page 52: Block Diagram

    VC-MH75HM 8. BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM...
  • Page 53 VC-MH75HM...
  • Page 54 VC-MH75HM SIGNAL FLOW BLOCK DIAGRAM...
  • Page 55 VC-MH75HM EE Signal PB Luminance Signal REC Luminance Signal PB Chrominance Signal REC Chrominance Signal...
  • Page 56 VC-MH75HM AUDIO BLOCK DIAGRAM...
  • Page 57 VC-MH75HM EE Signal PB Signal REC Signal...
  • Page 58 VC-MH75HM POWER CIRCUIT BLOCK DIAGRAM...

  • Page 59: Schematic Diagram And Pwb Foil Pattern

    VC-MH75HM 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT (1-1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 60 VC-MH75HM...
  • Page 61 VC-MH75HM MAIN CIRCUIT (1-2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 62 VC-MH75HM...
  • Page 63 VC-MH75HM MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 64 VC-MH75HM...
  • Page 65 VC-MH75HM MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 66 VC-MH75HM...
  • Page 67 VC-MH75HM MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 68 VC-MH75HM...
  • Page 69 VC-MH75HM EUR-TERM CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 70 VC-MH75HM OPERATION CIRCUIT BACK LIGHT CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 71 VC-MH75HM NICAM/IGR CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 72 VC-MH75HM 11. EXPLODED VIEWS MECHANISM CHASSIS PARTS...
  • Page 73 VC-MH75HM CASSETTE HOUSING CONTROL PARTS...
  • Page 74 VC-MH75HM MECHANICAL PARTS...
  • Page 75 VC-MH75HM FRONT PANEL PARTS 500-7 500-3 500-1 500-11 500-6 500-5 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° Removing the cassette compartment cover.

  • Page 76: Replacement Parts List

    VC-MH75HM 10. REPLACEMENT PARTS LIST/ Ref. No. Part No. Description Code Ref. No. Part No. Description Code ERSATZTEILLISTE DUNTKB110TE PARTS REPLACEMENT/ MAIN Unit EXPLOSIONSDARSTELLUNGEN TUNER Parts marked with " å " are important for maintaining the safety of TU101 VTUATMDB2-633 U VHF Tuner the set.
  • Page 77 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code D962 RH-EX0627GEZZY V Zener Diode C303 VCKYCY1HF103ZS V 0.01 50V Ceramic D963 RH-EX0631GEZZY V Zener Diode C304 VCKYCY1HF103ZS V 0.01 50V Ceramic D971 RH-EX0720GEZZY V Zener Diode C305 VCKYCY1HF103ZS V 0.01...
  • Page 78 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code å C934 C664 VCEA9M1CW106M+ V 10 16V Electrolytic RC-EZ1075CEZZ V Capacitor å C938 C665 VCEA9M1CW106M+ V 10 16V Electrolytic VCEA0A1EW107M+ V 100 25V Electrolytic å C939 C666 VCKYCY1CB473KS U 0.047 16V Ceramic...
  • Page 79 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code R625 VRS-CY1JF222JS V 2.2k 1/16W Metal Oxide AA R756 VRS-CY1JF103JS V 10k 1/16W Metal Oxide AA R626 VRS-CY1JF101JS V 100 1/16W Metal Oxide AA R760 VRG-SC2EB1R0J+ V 1...
  • Page 80 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code MISCELLANEOUS PARTS DUNTB106TE å ACC901 QACCB5014UMZZ U AC Cord OPERATION Unit å F901 QFS-C2025CEZZ V Fuse, 2A/250V FB101 RBLN-0043CEZZY V Ferrite Bead RESISTORS FB204 RBLN-0090GEZZY V Ferrite Bead...
  • Page 81 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1723 VCEA9M1CW106M+ V 10 16V Electrolytic C2891 VCEA9M1CW106M+ V 10 16V Electrolytic C1730 VCEA9M1CW106M+ V 10 16V Electrolytic C2892 VCCCCY1HH221JY V 220p 50V Ceramic C1731 VCEA9M1CW106M+ V 10...
  • Page 82 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code LX-RZ3015GEFJ J CS Washer MECHANISM CHASSIS PARTS XRESJ30-06000 V E-3(MASTERCAM) XWHJZ31-03052 V Reel Washer 0.3 XWHJZ31-04052 V Reel Washer 0.4 LBNDK1021AJZZ V Tension Band Ass'y XWHJZ31-05052 V Reel Washer 0.5...
  • Page 83 VC-MH75HM Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANICAL PARTS GCABA3169UMSW U Top Cabinet GCABB1258AJNA U Main Frame GCOVAA013WJZZ U Antenna Terminal Cover XHPSD30P06WS0 V Screw LANGK0261AJFW V Top Cabinet Fix Angle XEPSD30P14XS0 V Screw...

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