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Tektronix TDS1001C-EDU, Service Manual

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Tektronix TDS1001C-EDU Service Manual Download Page 76

Maintenance

Figure 7: Instrument cable locations (Main Board SN C030000 or later)

3.

Use the screwdriver to remove the three screws that attach the Main board
module to the internal assembly.

4.

Use the socket to remove the nuts and washers from the BNC connectors.

5.

Pull the board out from the front slots of the internal assembly.

Installation.

1.

Work from the bottom of the internal assembly and place the front of the Main
board module into the slots on the internal assembly near the BNC connectors.

2.

Use the deep socket to attach the washers and nuts to each BNC connector so
that the Main board is securely attached to the chassis.

64

TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual

Summary of Contents for TDS1001C-EDU

Page 1: ...ls with serial numbers of C030000 and above This document applies to firmware version 1 00 and above Warning The servicing instructions are for use by qualified personnel only To avoid personal injury...

Page 2: ...this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc OpenChoice is a...

Page 3: ...000C EDU Models 15 Limit Testing System Characteristics Not Available on TDS1000C EDU Models 16 Where to Find Operating Information 19 Theory of Operation 21 System Level Block Diagrams 22 Main Board...

Page 4: ...50 Exterior Inspection 51 Interior Inspection 51 Cleaning Procedure Interior 52 Removal and Installation Procedures 54 Summary of Procedures 54 Required Tools 56 Rear Feet 56 Flip Feet 57 Front Panel...

Page 5: ...ons 83 Diagrams 85 Replaceable Parts 87 Parts Ordering Information 87 Using the Replaceable Parts List 88 Parts Lists and Exploded Views 89 Appendix A Example of a Vertical Position Accuracy Test Spre...

Page 6: ...n 55 Figure 7 Instrument cable locations Main Board SN C030000 or later 64 Figure 8 Oscilloscope troubleshooting tree page 1 of 4 70 Figure 9 Oscilloscope troubleshooting tree page 2 of 4 71 Figure 10...

Page 7: ...eps 45 Table 16 External inspection checklist 51 Table 17 Internal inspection checklist 52 Table 18 Tools and equipment 69 Table 19 Probe Comp output 74 Table 20 Troubleshooting the power supply 75 Ta...

Page 8: ...grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe all terminal ratin...

Page 9: ...practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Symbols and terms on th...

Page 10: ...ndering first aid and resuscitation is present Disconnect power To avoid electric shock switch off the instrument power then disconnect the power cord from the mains power Use care when servicing with...

Page 11: ...d replaceable assembly or mechanical part specifically by its name or generically as a replaceable part In general a replaceable part is any circuit board or assembly such as the hard disk drive or a...

Page 12: ...Preface x TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 13: ...ormance Verification section See page 27 Performance Verification Signal Acquisition System Characteristics NOTE All amplitude related or modified specifications require 1X probe attenuation factors u...

Page 14: ...constructed Fine gain values for instance 120 mV div are acquired at the next higher coarse gain setting in this case 200 mV div The Display Gain Variable is achieved by digital multiplication of the...

Page 15: ...Vertical position 0 3 of reading 0 1 div 1 mV Vertical position 0 and vertical scale 2 mV div to 200 mV div 3 of reading vertical position 1 of vertical position 0 2 div 7 mV Vertical position 0 and v...

Page 16: ...ngs with the bandwidth limit at full 5 mV div settings are limited to 20 MHz bandwidth TDS1012C EDU DC to 100 MHz for 5 mV div through 5 V div settings with bandwidth limit at full 5 mV div settings a...

Page 17: ...ns TDS2012C TDS2014C 3 5 ns TDS2002C TDS2004C 5 0 ns TDS2001C 7 0 ns TDS1012C EDU 3 5 ns TDS1002C EDU 5 8 ns TDS1001C EDU 8 8 ns Rise Time typical Rise time is generally calculated from the following...

Page 18: ...h equal Volts Div and Coupling settings on each channel Common Mode Rejection Ratio CMRR typical TDS1001C EDU TDS1002C EDU TDS2001C TDS2002C TDS2004C 100 1 at 60 Hz reducing to 20 1 with a sine wave w...

Page 19: ...le for this product This is the maximum total long term error in sample rate or horizontal position time accuracy expressed in parts per million Long Term Sample Rate and Horizontal Position Time Accu...

Page 20: ...10 mV div Condition Time Measurement Accuracy Single shot sample mode full bandwidth selected 1 Sample Internal 100 ppm reading 0 6 ns 16 averages full bandwidth selected 1 Sample Internal 100 ppm rea...

Page 21: ...Scan Mode which begins at 100 ms div when Trigger Mode is AUTO By adjusting Trigger Mode to NORMAL the Scan Mode operation is turned off and Holdoff can be adjusted at larger seconds Div settings Ext...

Page 22: ...nsitivity Measurement style B All products 1 5 div from DC to 10 MHz 2 mV div 4 div from DC to 10 MHz 2 mV Div 1 div from DC to 10 MHz 2 mV div 2 5 div from DC to 10 MHz 2 mV Div TDS1001C EDU 3 div be...

Page 23: ...ut channel source 4 mV for Ext source and 20 mV for Ext 5 source This is the amount of deviation allowed between the level on the waveform at which triggering occurs and the level selected for DC coup...

Page 24: ...16 5 ns Not Equal Guardband All pulses even from the most stable sources have some amount of jitter To avoid disqualifying pulses that are intended to qualify but are not absolutely correct values we...

Page 25: ...that qualify as triggerable events for example all narrow pulses in a PWM pulse train if set to mode and the limit is set to a relatively small number Edge Trigger mode Counts all pulses of sufficient...

Page 26: ...in memory The settings are not lost when the instrument is turned off or if there is a power failure Stored Waveforms and Multiple Front Panel Settings Two Channel 1 Channel 2 or Math waveforms can b...

Page 27: ...y a Maximum Wet Bulb Temperature of 37 C derates relative humidity to 45 RH at 50 C Humidity Nonoperating 5 to 85 relative humidity RH at up to 40 C 5 to 45 RH above 40 C up to 50 C noncondensing Abov...

Page 28: ...source which you want to do the limit testing Channel 1 Channel 2 Channel 3 Channel 4 Math Compare Ref Channel The reference channel where the template is saved RefA RefB RefC RefD The limit testing...

Page 29: ...ically save a digital copy of the source waveform when a violation is detected Stop After Defines the conditions that will cause the oscilloscope to end limit testing Manual Lets you stop the test by...

Page 30: ...Specifications 18 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 31: ...ting your TDS2000C or TDS1000C EDU Series Digital Storage Oscilloscope refer to the user manual for your product The user manuals are available in eleven languages and are on the Web at www tektronix...

Page 32: ...Where to Find Operating Information 20 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 33: ...00C and TDS1000C EDU series oscilloscopes to the module level by describing the basic operation of each functional circuit block NOTE The descriptions for the 2 channel and 4 channel models are slight...

Page 34: ...high level block diagrams are provided one for 2 channel models and one for 4 channel models See Figure 1 on page 22 See Figure 2 on page 23 Figure 1 Module level block diagram 2 channel 22 TDS2000C...

Page 35: ...Theory of Operation Figure 2 Module level block diagram 4 channel TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 23...

Page 36: ...e gain amplifiers as well as filters that provide 20 MHz bandwidth limiting The task of the amplifier ASIC is to convert from a 1 M single ended environment in the front end to a much lower impedance...

Page 37: ...NC connectors are mounted on the Main board for all signal inputs The signal inputs are compatible with the supplied TPP0101 and TPP0201 probes Probe Compensation The Probe Comp and ground terminals a...

Page 38: ...IC on the Front Panel board provides buffering and multiplexing of switch signals to the Main board Two signals and a sense line are provided by the Main board to support the front panel One of these...

Page 39: ...ble BNC male to BNC male 1 m 36 in long Tektronix part number 012 0482 XX 50 BNC Cable BNC male to BNC male 25 cm 10 in long Tektronix part number 012 0208 XX 50 Feedthrough Termination BNC male and f...

Page 40: ...Bandwidth 2 12 V 2 Channel 3 Bandwidth 1 2 12 V 2 Channel 4 Bandwidth 1 2 12 V 2 Sample Rate and Delay Time Accuracy 2 divs 2 divs Channel 1 Edge Trigger Sensitivity Stable trigger 3 Channel 2 Edge T...

Page 41: ...ment or hookups are required Verify that no error messages are displayed before continuing with this procedure Self Calibration The self calibration routine lets you quickly optimize the oscilloscope...

Page 42: ...ty of the DC voltage source and record the mean measurement as Vneg c Calculate Vdiff Vpos Vneg and compare Vdiff to the accuracy limits in the following table Vertical Scale volts div setting DC volt...

Page 43: ...ontal Scale seconds division to 10 ms div 5 Set the leveled sine wave generator frequency to 50 kHz 6 Set the leveled sine wave generator output level so the peak to peak measurement is between 2 98 V...

Page 44: ...illoscope to the time mark generator as shown in the following figure 3 Set the time mark generator period to 10 ms 4 Set the oscilloscope Vertical Scale volts division to 500 mV div 5 Set the oscillo...

Page 45: ...nter corresponds to a 25 ppm time base error 11 Disconnect the test setup Check Edge Trigger Sensitivity This test checks the edge trigger sensitivity for all input channels 1 Set up the oscilloscope...

Page 46: ...001C EDU 50 MHz if you are checking a TDS2001C 60 MHz if you are checking a TDS1002C EDU 70 MHz if you are checking a TDS2002C or TDS2004C 100 MHz if you are checking a TDS1012C EDU TDS2012C TDS2014C...

Page 47: ...option Select setting Default Setup Channel 1 Probe 1X Source Ext Trig Menu Mode Normal Acquire Sample Source CH1 Measure Type Pk Pk 2 Connect the oscilloscope to the leveled sine wave generator as sh...

Page 48: ...Horizontal Scale seconds division to 2 5 ns div 13 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 14 Change the oscilloscope setup using the following table...

Page 49: ...id false triggering on noise the Ext trigger is the recommended source 2 Make a spreadsheet approximately as shown in the example in Appendix A You only need to enter the values for column A and the e...

Page 50: ...the appropriate columns B and C 7 Repeat steps 4 through 6 for the values of 1 76 V through 0 V 8 Swap the connections to the positive terminal of the power supply with those at the negative terminal...

Page 51: ...ror values the blue line in the center go above the yellow line upper line or below the purple line lower line For calculations involved in this example refer to the data in the previous table see ste...

Page 52: ...Performance Verification 40 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 53: ...rator 5 kHz and 200 MHz 0 6 amplitude accuracy Wavetek 9100 Universal Calibration System with Oscilloscope Calibration Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibrat...

Page 54: ...le 15 on page 45 Enable the Service Menu Before performing the adjustment procedure enable the Service menu as follows 1 Power on the oscilloscope 2 Push the front panel Measure button to access the M...

Page 55: ...Adjustment Procedures Figure 4 Adjustment setups TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 43...

Page 56: ...the Adjustment setup table for the remainder of the routine applying the proper signal for each step See Table 15 NOTE During some steps the oscilloscope may appear to be idle for several minutes whil...

Page 57: ...14 DC Voltage 1 0 02 V 15 DC Voltage 1 0 015 V 16 DC Voltage 1 0 015 V 17 DC Voltage 1 0 02 V 18 DC Voltage 1 0 03 V 19 DC Voltage 1 0 04 V 20 DC Voltage 1 0 08 V 21 DC Voltage 1 0 16 V 22 DC Voltage...

Page 58: ...ve Generator 50 BWL 2 5 Vp p 51 Sinewave Generator 50 BWL 5 Vp p Sinewave generator 52 Sinewave Generator 50 BWL 1 6 Vp p Ch 1 Edge 53 Edge 50 1 kHz 0 to 800 mV 54 Sinewave Generator 50 5 kHz 1 Vp p 5...

Page 59: ...2 5 Vp p 87 Sinewave Generator 50 BWL 5 Vp p Sinewave generator 88 Sinewave Generator 50 BWL 1 6 Vp p Ch 3 4 Ch models only Edge 89 Edge 50 1 kHz 0 to 800 mV 90 Sinewave Generator 50 5 kHz 1 Vp p 91 S...

Page 60: ...Adjustment Procedures 48 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 61: ...tatic sensitive modules Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Service static sensitive modules only at static free works...

Page 62: ...t from line voltage before performing any procedure that follows Exterior Cleaning CAUTION Avoid the use of chemical cleaning agents which might damage the plastics used in this oscilloscope Use only...

Page 63: ...eformed contacts Dirt in connectors Repair or replace defective modules Clear or wash out dirt Carrying handle and cabinet feet Correct operation Repair or replace defective module Accessories Missing...

Page 64: ...isopropyl alcohol 75 solution and then wipe with a lint free cloth dampened with warm deionized water A cotton tipped applicator is useful for cleaning in narrow spaces and on circuit boards STOP If...

Page 65: ...4 Spray wash dirty parts with the 75 isopropyl alcohol solution and wait 60 seconds for the majority of the alcohol to evaporate 5 Use hot 49 C to 60 C 120 F to 140 F deionized water to thoroughly ri...

Page 66: ...to the Replaceable Parts List for a list of all replaceable modules and their part numbers Refer to the Exploded View Diagrams for each procedure as indicated in the table Summary of Procedures Compl...

Page 67: ...intenance Figure 5 Locator for trim and cabinet removal 4 channel model shown Figure 6 Locator for internal modules 4 channel model shown TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 5...

Page 68: ...ACTO knife or equivalent 3M Electrical Tape 92 with 1 mil polyimide Kapton backing temperature rated 180 C UL510 Flame Retarded Rear Feet You will need a flat blade screwdriver to remove the rear fee...

Page 69: ...into the slot on the other side Front Panel Knobs Refer to the exploded view diagram for the 2 channel models or the 4 channel models See page 89 See page 92 NOTE Wrap the plier jaws with tape such a...

Page 70: ...n the front and rear cases 2 Place the rear case onto the assembled oscilloscope and verify that All of the edges align with the front case The Li ION battery is vertical in the battery location The s...

Page 71: ...ar Case 2 Slide the front feet out of the front case Installation Slide the feet into the slots provided in the front case NOTE If the front feet are not installed but are available they can be insert...

Page 72: ...Installation 1 Align and place the power supply module into the internal assembly 2 Install the two longer screws with thread lock into the IEC AC power connector mounting holes 3 Install the three sh...

Page 73: ...embly consisting of the chassis all of the boards and the display screen out of the front case NOTE The switch keypad will most likely remain inside the front case You do not need to remove it with th...

Page 74: ...on the front panel cable assembly to disconnect the front panel cable from J1 on the Front Panel module Installation 1 Connect the front panel cable to the Front Panel module at J1 through the appropr...

Page 75: ...r installing the Main board See page 49 Preventing ESD Removal 1 Remove the power button and rear case See page 58 Rear Case Remove the internal assembly from the front case See page 61 Internal Assem...

Page 76: ...connectors 5 Pull the board out from the front slots of the internal assembly Installation 1 Work from the bottom of the internal assembly and place the front of the Main board module into the slots...

Page 77: ...assembly 4 Connect the following cables on the Main board The power supply cable at J101 The display ribbon cable J1501 for 2 Ch J2002 for 4 Ch The backlight wire cable J1502 for 2 Ch J2001 for 4 Ch T...

Page 78: ...pply Module 6 Remove the four screws attaching the display module to the chassis The screws were exposed when the power supply module was removed 7 Remove the display from the chassis Handle this asse...

Page 79: ...ng the Front Panel module to the internal assembly 5 Pull the module away from the internal assembly 6 Pull on the front panel cable assembly to disconnect the front panel cable from J1 on the Front P...

Page 80: ...the back of the keypad clean Skin oils and dust inhibit good electrical contact Installation 1 Place the front case face down on a soft surface such as an anti static mat 2 Align the switch keypad int...

Page 81: ...ment to troubleshoot the oscilloscope Table 18 Tools and equipment Tools and equipment Example Oscilloscope with 1X 10X and 100X probes Tektronix TDS2000C or TDS1000C EDU series oscilloscope with stan...

Page 82: ...Maintenance Figure 8 Oscilloscope troubleshooting tree page 1 of 4 70 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 83: ...Maintenance Figure 9 Oscilloscope troubleshooting tree page 2 of 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 71...

Page 84: ...Maintenance Figure 10 Oscilloscope troubleshooting tree page 3 of 4 72 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 85: ...Maintenance TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 73...

Page 86: ...g acquisition or one of those two modules is not performing correctly While many different possible frequencies exist all involve detected failures on the Main board due to Main board failure or power...

Page 87: ...to 3 5 V 0 8 A 9 3 5 8 10 2 5 V Line trigger 2 V to 6 V open circuit 1 diode drop when attached to the Main board 1 mA 11 3 5 8 10 Line trigger 1 With 3 W minimum load still functions with no load 3 I...

Page 88: ...Display Module 4 Reseat the display cable to the Display module making sure that the cable is fully seated in the connector 5 Reconnect the Display module to the internal assembly 6 Reattach the front...

Page 89: ...wing options appear Table 22 Troubleshooting the front panel Service Diag Menu Comments Mfg Tests Displays a front panel simulation used to check that all front panel controls are operational Loop Dia...

Page 90: ...d the TPP0201 probe to probe the front panel cable connector at J202 on the Main board 2 channel models or J1 4 channel models The following table describes the signals you should expect to see Table...

Page 91: ...ses Determines beginning of a scan sequence for second half of front panel 1 Unused and open on 2 channel models 2 Unused and tied low on 2 channel models 11 If all of the signals are present the Fron...

Page 92: ...10 3 3 V 2 5 V 4 V 5 0 V to 3 5 V 0 8 A 9 3 5 8 10 2 5 V Line trigger 2 V to 6 V open circuit 1 diode drop when attached to the Main board 1 mA 11 3 5 8 10 Line trigger 1 With 3 W minimum load still...

Page 93: ...sed anytime by pushing the UTILITY button and selecting Error Log The following table lists the error codes and probable causes See Table 26 Table 26 List of error codes Error code Description Probabl...

Page 94: ...e Menu 2 Push the UTILITY button and push the Service option button to display the Service menu 3 Push the Service Diag option button to display the Diagnostics menu 4 Push the Clear Error Log option...

Page 95: ...mation The owner address Name and phone number of a contact person Type and serial number of the oscilloscope Reason for returning A complete description of the service required Seal the shipping cart...

Page 96: ...Maintenance 84 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 97: ...peration of the TDS2000C and TDS1000C EDU series oscilloscopes using the major circuit blocks or modules The oscilloscope module interconnections are shown in the figure See Figure 11 TDS2000C and TDS...

Page 98: ...haded area in the figure represents modules and circuits used only in 4 channel oscilloscopes Figure 11 TDS2000C and TDS1000C EDU series block diagram 86 TDS2000C and TDS1000C EDU Series Oscilloscope...

Page 99: ...improved part your local Tektronix field office or representative will contact you concerning any change in part number Part Number Revision Level Tektronix part numbers contain two digits that show t...

Page 100: ...this section are referenced by figure and index numbers to the exploded view illustrations that follow 2 Tektronix Part Number Use this part number when ordering replacement parts from Tektronix 3 an...

Page 101: ...e module level exploded views of the TDS2000C and TDS1000C EDU oscilloscopes Following each exploded view is the list of components indexed by the numbers in the figure Figure 12 Exploded diagram 2 ch...

Page 102: ...D ELASTOMERIC FRONT PANEL 2 CH COLOR BONDED 6 211 1272 00 9 SCREW MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 7 870 0188 02 1 CIRCUIT BD ASSY FRONT PANEL BOARD 2 CH 389 3835 01 WIRED 8 441 2454 03...

Page 103: ...297 00 4 LCD NUT M4 15 210 1610 00 4 LCD STANDARD SPRING WASHER M4 16 441 271 00 2 SHIELD GUARD VIBRATION DAMPER 17 850 0115 70 1 DISPLAY ASSY COLOR 18 348 1525 00 2 FOOT FRONT SANTOPRENE BLACK 64 DER...

Page 104: ...Replaceable Parts Figure 13 Exploded diagram 4 channel models 92 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 105: ...ITCH KEYPAD ELASTOMERIC FRONT PANEL 4 CH COLOR BONDED 6 211 1272 00 9 SCREW MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 7 870 0190 02 1 CIRCUIT BD ASSY FRONT PANEL BOARD 4 CH 389 3836 00 WIRED 8 44...

Page 106: ...iscont d Qty Name description 8 3 POWER SUPPLY INSTRUMENT CABLES WIRES 1 174 6101 00 1 CA ASSY FPC FFC LCD DISPLAY DATA CABLE 2 211 1272 00 10 SCREW MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 3 34...

Page 107: ...ve Serial no discont d Qty Name description 5 119 7609 02 1 POWER SUPPLY CUSTOM AC DC 85 275 VAC 45 440HZ IN 6 V 1 0 A 3 3 V 1 8 A 4 V 0 8 A 35 V 0 015 A OUT LINE TRIGGER SIGNAL SAFETY CONTROLLED 6 21...

Page 108: ...Replaceable Parts Figure 15 Exploded diagram back case and trim 96 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 109: ...ITH FEET AND HANDLE 1 850 0154 00 1 REAR CASE ASSY COVER WITH FEET AND HANDLE 2 348 1703 00 2 FOOT FRONT FLIPMPC ABS SILVER GRAY 3 348 1704 00 2 FOOT REAR SANTOPRENE BLACK 4 211 1272 00 5 SCREW MACHIN...

Page 110: ...Replaceable Parts 98 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...

Page 111: ...in Adobe Reader version 7 or later 5 Click the Attachments tab or click View Navigation Panels Attachments to display the Attachments panel 6 Double click the VPA Test Table xls file 7 Click OK in the...

Page 112: ...0248 0 0248 0 015 16 1 44 1 44 1 45 0 010 0 0244 0 0244 0 014 Minimum margin 0 007 MIN G7 G97 17 1 40 1 4 1 41 0 010 0 024 0 024 0 014 18 1 36 1 36 1 37 0 010 0 0236 0 0236 0 014 19 1 32 1 32 1 33 0...

Page 113: ...0 003 0 0108 0 0108 0 008 51 0 04 0 04 0 043 0 003 0 0104 0 0104 0 007 52 0 00 0 0 002 0 002 0 01 0 01 0 008 53 0 04 0 04 0 039 0 001 0 0104 0 0104 0 009 54 0 08 0 079 0 079 0 000 0 01079 0 01079 0 01...

Page 114: ...24 1 24 0 000 0 0224 0 0224 0 022 84 1 28 1 28 1 28 0 000 0 0228 0 0228 0 023 85 1 32 1 32 1 32 0 000 0 0232 0 0232 0 023 86 1 36 1 36 1 36 0 000 0 0236 0 0236 0 024 87 1 40 1 4 1 4 0 000 0 024 0 024...

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