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TDS2000C and TDS1000C-EDU Series Digital Storage

1. CAUTION Keep the electrical contacts on the back of the switch keypad clean Skin oils and dust inhibit good electrical contact 3 Check that all buttons are properly seated before proceeding 4 Assemble the oscilloscope by performing the installation procedure for each module that was removed 6 22 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Troubleshooting This section contains information and procedures to help you isolate a defective module in the oscilloscope WARNING Before performing this or any other procedure in this manual read the General Safety Summary and Service Safety Summary found at the beginning of this manual Also to prevent possible injury or damage to electrical components read Preventing ESD See page 6 1 Preventing ESD Adjustment After Repair If you replace the Main board or power supply you must adjust the oscilloscope after repair Refer to the chapter Adjustment Procedures Required Tools and Use the following tools and equipment to troubleshoot the oscilloscope Equipment Table 6 3 Tools and equipment Tools and equipment Example Oscilloscope with 1X 10X and 100X Tektronix TDS2000C or TDS1000C EDU series oscilloscope with standard accessory 10X probes probe TPP0201 or TPP0101 and optional 100X probe P5100 or P5200 DMM 3 5 or greater digit DMM USB flash drive Tektronix part number 119 7276 00 128 MB USB type A to type B cable Te
2. Interface Using the Error Log 1 Remove the rear case See page 6 10 Rear Case 2 Check that the coaxial connections to the back side of the BNC connectors are intact Use the DMM to measure continuity from the front side of the BNC connector to the point where it attaches to the Main board NOTE The ground side of the BNC has three connections two mounting lugs and one signal wire while the center connection has one Incomplete or poor connection of the ground side may cause AC signal quality problems without affecting DC measurement capability 3 Ifno problem is found and the trouble persists the Main board is probably defective in some way that the internal diagnostics cannot detect Replace it To troubleshoot the USB interface if the acquisition is working and the USB is not replace the Main board Failures that occur during the power up diagnostics or normal oscilloscope operation place an entry in the error log Accessing the error log The error log list can be accessed anytime by pushing the UTILITY button and selecting Error Log The following table lists the error codes and probable causes See Table 6 12 Table 6 12 List of error codes Error code Description Probable cause 0 DI Diagnostics internal error Contact Tektronix 1 DI ADG522 diagnostics failed Main board or power supply failure 2 DI PROM diagnostics failed Main board or power supply failur
3. Replaceable Parts Figure 8 2 Exploded diagram 4 channel models 8 7 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Table 8 4 Replaceable parts list power supply module cables and wires Fig amp Tektronix Serial Serial index part no no number number effective discontd Qty Name amp description 8 3 POWER SUPPLY CABLES WIRES 1 346 0299 00 1 CABLE TIE BAND 2 174 5859 00 1 CA ASSY DISPLAY CABLE 3 211 1272 00 10 SCREW MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 4 174 4658 00 1 CA ASSY SP DISCRETE 26 AWG 5 5 L FEMALE 1 X 12 0 059 1 5 MM CTR DUAL ENDED FRONT PANEL 5 343 1673 00 1 CLAMP CABLE NYLON 6 6 COLOR NATURAL 6 174 5819 00 1 CA ASSY FPC FFC LCD DATA CABLE 7 211 1275 00 2 SCREW MACHINE W HEAVY PATCH THREADLOCKING MATERIAL 6 32 X 0 312 L PNH STL ZNPL T15 8 119 7609 70 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 9 276 0387 00 2 CORE EMI EMI SUPPRESSION FERRITE SPLIT ROUND CABLE IMPED 130 OHM AT 100 MHZ 0 197 DIA HOLE 4 CHANNEL MODELS ONLY installed on the Display cable 8 8 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Main board J201 The 4 channel version showing EMI ferrite clamps Main board assembly J201 J202
4. 0446 005 Figure 6 2 Locator for internal modules 4 channel model shown TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 7 Maintenance Required Tools Use the following tools to remove and replace all modules in the oscilloscope Torque limiting screwdriver long shank 12 in lb 1 3 N m range with Torx T 15 tip if you use a magnetic screwdriver with interchangeable bits the T 15 bit must be a long bit at least 5 cm 2 in overall length Torque limiting screwdriver with Torx T 8 bit 5 8 inch deep socket with wide center hole S K Hand Tool Corp S K 40820 or equivalent Torque wrench to 40 in Ib 4 5 N m Screwdriver with 1 4 inch flat blade Pliers all purpose and needle nose Sharp knife X 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 feet Refer to the exploded view diagram See page 8 11 Removal 1 2 Place the oscilloscope face down on a soft surface such as an anti static mat Use a flat blade screwdriver to pry out the foot or twist the foot as you are removing it so that it disengages from the guides Use care not to mar the surface of the rear case Installation 1 2 6 8 Place the oscilloscope face down on a soft surface such as an anti static mat Align the slots of the rear foot with the guides in the re
5. 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 rinse the parts 6 Dry all parts with low pressure deionized air 7 Dry all components and assemblies in an oven or drying compartment using low temperature 52 C to 66 C 125 F to 150 F circulating air Lubrication Periodic lubrication is not required for the oscilloscope TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 5 Maintenance Removal and Installation Procedures WARNING Only qualified personnel should perform service procedures Before doing this or any other procedure in this manual read the General Safety Summary and Service Safety Summary found at the beginning of this manual To prevent damage to electrical components refer Preventing ESD See page 6 1 Preventing ESD Always disconnect the power cord before disassembling any part of the oscilloscope Refer to the module locator drawings to find the modules that you want to remove or install See Figure 6 1 on page 6 7 See Figure 6 2 on page 6 7 Refer to the Inspection and Cleaning procedure if you are disassembling the instrument for cleaning See page 6 1 Inspection and Cleaning Refer to the Replaceable Parts List for a list of all replaceable modules and their part numbers Refer to the Exploded
6. Push menu button Select menu option Select setting Default Setup Channel 1 Probe 1X Acquire Average 16 Measure Source Channel under test Type Mean TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 3 Performance Verification 3 Connect the oscilloscope channel under test to the DC voltage source as shown in the following figure DC voltage Digitizing oscilloscope source Q BG ELG OIM e coooo o opo 9 D a eee FOOO a o r Dual banana Seem o 9 to BNC adapter BNC cable 4 For each vertical scale volts division setting in the following table perform the following steps a Setthe DC voltage source output level to the positive voltage listed and then record the mean measurement as V pos b Reverse the polarity of the DC voltage source and record the mean measurement as Vs c Calculate Vait Vpos Vneg and compare Vait to the accuracy limits in the following table Vertical Scale DC voltage volts div setting source output levels Accuracy limits for Vai 5 mV div 17 5 mV 17 5 mV 33 6 mV to 36 4 mV 200 mV div 700 mV 700 mV 1 358 V to 1 442 V 2 Vidiv 7 00 V 7 00 V 13 58 V to 14 42 V 5 Set DC voltage source output level to 0 V 6 Disconnect the test setup 7 Repeat steps 1 through 6 for all input channels 4 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verificat
7. Release the Single button se Du OM A A o pm Release the AutoSet button A message appears in the lower left corner of the screen stating Service mode ON 9 Push the front panel Utility button The last item in the Utility menu is now Service At completion of the Adjustment procedure disable the Service menu through the Utility front panel button the Service option button and the Service Mode Off option button TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Adjustment Procedures DC voltage setup 1 Two Channel Four Channel Digitizing oscilloscope Digitizing oscilloscope DC voltage source o SS O Se ee e Ge oG oo oe eoocdocc ocdunoQocxco 20000 5 2 doo 8 o o 00000 e ood ce c ca T E A 20008 o COO00 0 O O O Dual banana to BNC adapter 10 inch BNC cables 10 inch BNC cable 10 inch BNC cable BNC T connector 10 inch BNC cables BNC cables 10 inch BNC cable BNC T connectors BNC T connector 10 inch BNC cable DC voltage setup 2 DC voltage source BNC adapter Two Channel Digitizing oscilloscope OC c aoa C O0 Cc0c 570 0 0 ce EC LO e O O EX Sees o gt o00000 0 Dual banana to 1M BNC cable Sinewave generator setup Two Channel Leveled sine Digitizing osci
8. T3 Sinewave Generator 50 Q 1 MHz 1 Vp p 74 Sinewave Generator 50 Q 50 kHz 1 Vp p T5 Sinewave Generator 50 Q 20 MHz 1 Vp 76 Sinewave Generator 50 Q BWL 25 mV TT Sinewave Generator 50 Q BWL 50 mV 78 Sinewave Generator 50 Q BWL 100 mV 79 Sinewave Generator 50 Q BWL 250 mV 80 Sinewave Generator 50 Q BWL 500 mV 81 Sinewave Generator 50 Q BWL 1 Vp p 82 Sinewave Generator 50 Q 5 kHz 2 5 Vo 83 Sinewave Generator 50 Q 1 MHz 2 5 Vp p 84 Sinewave Generator 50 Q 50 kHz 2 5 Vp p 85 Sinewave Generator 50 Q 20 MHz 2 5 Vp p 86 Sinewave Generator 50 Q BWL 2 5 VP P 87 Sinewave Generator 50 Q BWL 5 Vp p 88 Sinewave Generator 50 Q BWL 1 6 Vp p Edge 89 Edge 50 Q 1 kHz 0 to 800 mV Ch 4 Sinewave 90 Sinewave Generator 50 Q 5 kHz 1 Vp p a models generator 91 Sinewave Generator 50 Q 1 MHz 100 mV 92 Sinewave Generator 50 Q 1 MHz 1 Vp p 93 Sinewave Generator 50 Q 50 kHz 1 Vp p 94 Sinewave Generator 50 Q 20 MHz 1 Vp 95 Sinewave Generator 50 Q BWL 25 mV 96 Sinewave Generator 50 Q BWL 50 mV 97 Sinewave Generator 50 Q BWL 100 mV 98 Sinewave Generator 50 Q BWL 250 mV 99 Sinewave Generator 50 Q BWL 500 mV 100 Sinewave Generator 50 Q BWL 1 Vp p 101 Sinewave Generator 50 Q 5 kHz 2 5 Vp p 102 Sinewave Generator 50 Q 1 MHz 2 5 Vp p 103 Sinewave Generator 50 Q 50 kHz 2 5 Vp p 104 Sinewave Generator 50 Q 20 MHz 2 5 Vp p 105 Sinewave Generator 50 Q BWL 2 5 Vp p 106 Sinewave Generator 50 Q BW
9. 0 0244 0 0244 0 014 Minimum 0 007 MIN margin G7 G97 17 1 40 14 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 0 010 0 0232 0 0232 0 013 20 1 28 1 28 1 29 0 010 0 0228 0 0228 0 013 21 1 24 1 24 1 25 0 010 0 0224 0 0224 0 012 22 1 20 1 2 1 21 0 010 0 022 0 022 0 012 23 1 16 1 16 1 17 0 010 0 0216 0 0216 0 012 24 1 12 1 12 1 13 0 010 0 0212 0 0212 0 011 25 1 08 1 08 1 09 0 010 0 0208 0 0208 0 011 26 1 04 1 04 1 05 0 010 0 0204 0 0204 0 010 27 1 00 1 1 01 0 010 0 02 0 02 0 010 28 0 96 0 96 0 966 0 006 0 0196 0 0196 0 014 29 0 92 0 92 0 926 0 006 0 0192 0 0192 0 013 30 0 88 0 88 0 886 0 006 0 0188 0 0188 0 013 31 0 84 0 84 0 845 0 005 0 0184 0 0184 0 013 32 0 80 0 8 0 805 0 005 0 018 0 018 0 013 33 0 76 0 76 0 764 0 004 0 0176 0 0176 0 014 A 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Appendix A Example of a Vertical Position Accuracy Test Spreadsheet Table A 1 Vertical position accuracy test spreadsheet cont 34 0 72 0 72 0 724 0 004 0 0172 0 0172 0 013 35 0 68 0 68 0 683 0 003 0 0168 0 0168 0 014 36 0 64 0 64 0 643 0 003 0 0164 0 0164 0 013 37 0 60 0 6 0 6 0 000 0 016 0 016 0 016 38 0 56 0 56 0 561 0 001 0 0156 0 0156 0 015 39 0 52 0 52 0 521 0 001 0 0152 0 0152 0 014 40 0 48 0 48 0 481 0 001 0 0148 0 0
10. 0272 0 0272 0 027 96 1 76 1 76 1 75 0 010 0 0276 0 0276 0 018 97 1 80 1 8 1 79 0 010 0 028 0 028 0 018 98 1 84 i i i 99 1 88 i t i 100 1 92 d i i 101 1 96 i i i 102 2 00 i i t These test values are outside of the range in the specification A 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual
11. 04 V through 1 8 V 10 Enter the Minimum Margin number cell 116 for the channel tested in the test record 11 Repeat steps 1 through 10 for all input channels TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification Data verification To verify data set the spreadsheet to present a line graph of columns D E and F Verify that no error 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 step 1 0 030 0 020 0 010 Measured Error 0 000 Error Lower limit 0 010 Upper limit 0 020 0 030 3 00 200 100 000 100 200 300 Measured Position Figure 4 1 Example of a line graph for the Vertical Position Accuracy test TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 13 Performance Verification 4 14 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Adjustment Procedures Adjustment Procedures This section contains adjustment procedures for the TDS2000C and TDS1000C EDU series oscilloscopes Only qualified personnel should perform service procedures Read the Service Safety Summary and the General Safety Summary at the beginning of this manual before performing any service procedures Refer to the user manual for information about using these oscilloscopes NOTE The voltage refere
12. 32 X 0 250 PNH STL ZNPL T 15 TORX DR 7 879 0188 02 1 CIRCUIT BD ASSY FRONT PANEL BOARD 2CH 389 3835 00 WIRED TDS1001C EDU TDS1002C EDU TDS1012C EDU 870 0188 02 1 CIRCUIT BD ASSY FRONT PANEL BOARD 2CH 389 3835 00 WIRED TDS2001C TDS2002C TDS2012C TDS2022C 8 441 2454 02 1 CHASSIS ASSY 2 CHANNEL SAFETY CONTROLLED 9 878 0391 70 1 CIRCUIT BD ASSY DISPLAY ADAPTER BOARD 389429600 BONDED 10 878 0586 70 1 CIRCUIT BD ASSY MAIN 2 CH TESTED amp CONFIGURED COLOR 389 4131 00 WIRED TDS1001C EDU TDS1002C EDU TDS1012C EDU 870 0560 01 1 CIRCUIT BD ASSY MAIN 2 CH 50 MHZ TESTED amp CONFIGURED COLOR 389 4131 00 WIRED TDS2001C 870 0561 01 1 CIRCUIT BD ASSY MAIN 2 CH 70 MHZ TESTED amp CONFIGURED COLOR 389 4131 00 WIRED TDS2002C 870 0562 01 1 CIRCUIT BD ASSY MAIN 2 CH 100 MHZ TESTED amp CONFIGURED COLOR 389 4131 00 WIRED TDS2012C 870 0563 01 1 CIRCUIT BD ASSY MAIN 2 CH 200 MHZ TESTED amp CONFIGURED COLOR 389 4131 00 WIRED TDS2022C TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 8 3 Replaceable Parts Table 8 2 Replaceable parts list 2 channel models cont Figure and Serial Serial index Tektronix no no no part no effective discont d Qty Name and description 11 210 1039 00 3 WASHER LOCK 0 521 ID INT 0 025 THK STEEL ZINC FINISH 12 220 0265 00 3 NUT PLAIN HEX 0 5 28 X 0 625 HEX BRS CD PL 13 211 1216 00 4 SCREW PT K 30 3MM PAN HEAD T
13. 8 COLOR 14 850 0115 70 1 DISPLAY ASSY COLOR 15 348 1525 00 2 FOOT FRONT SANTOPRENE BLACK 64 DEROMETER TEXTURED 16 131 6417 00 1 CONTACT ELEC GROUNDING 0 600 L X 0 250 W X 0 220 D ELECTROLESS NICKEL PLATE 17 131 6521 00 1 CONTACT ELEC EMI CLIP ON 0 38 L X 0 460 W 2 CONTACTS X 0 45 HIGH ELECTROLESS NICKEL PLATE 8 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Figure 8 1 Exploded diagram 2 channel models 8 5 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Table 8 3 Replaceable parts list 4 channel models Figure and Serial Serial index Tektronix no no no part no effective discont d ty Name and description 8 2 4 CHANNEL MODELS 1 850 0157 00 1 FRONT CASE ASSY COVER W FEET TDS2004C TDS2014C TDS2024C 2 366 0863 00 1 ASSEMBLY KNOB 0 685 DIAMETER 3 366 0862 00 1 ASSEMBLY KNOB 0 470 DIAMETER 4 335 2318 00 1 ARKER IDENTIFICATION 4CH LANGUAGE FRENCH 335 2319 00 1 ARKER IDENTIFICATION 4CH LANGUAGE ITALIAN 335 2320 00 1 ARKER IDENTIFICATION 4CH LANGUAGE GERMAN 335 2321 00 1 ARKER IDENTIFICATION 4CH LANGUAGE SPANISH 335 2322 00 1 ARKER IDENTIFICATION 4CH LANGUAGE JAPANESE 335 2323 00 1 ARKER IDENTIFICATION 4CH LANGUAGE PORTUGUESE 335 2324 00 1 ARKER IDENTIFICATION 4CH LANGUAGE SIMPLIFIED CHINES
14. 833 9200 and select option 2 New modules You may purchase replacement modules in the same way as other replacement parts Using the Replaceable Parts List This section contains a list of the mechanical and or electrical components that are replaceable for the oscilloscope Use this list to identify and order replacement parts The following table describes each column in the parts list Table 8 1 Replaceable parts list Column Column name Description 1 Figure amp Index Number Items in 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 and 4 Serial Number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 5 Qty This indicates the quantity of parts used 6 Name amp Description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 8 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Parts Lists and Exploded Views The
15. Able to run main board front panel Replace cable tests front panel or main j board Verify power supply voltages ee from Troubleshooting Tree page 1 Power supplies OK Disconnect ower suppl Run front panel p pply tests in service menu Verify power Replace main supply Voltages board Check cabling to lt 5 key main board problem Replace cable or main board Power Replace power UN supplies OK supply Replace front panel board Replace main board Figure 6 6 Oscilloscope troubleshooting tree page 2 of 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 25 Maintenance t to Troubleshooting Tree page 1 B from Troubleshooting Tree page 1 Power cord Attach power attached cord A Reinstall case No Replace Power Supply No Attach backlight cable Yes Open case Backlight cable attached Yes No Replace Display Adapter board Display Adapter J204 pin 6 vs pin 1 Output Vz15 5V Yes Display Adapter J204 each pin equals about 25 mA Yes Detach display Display Adapter J202 pin 2N Yes Replace display 3 3V amp J202 pin 4 6V No Replace display No Replace power supply Figure 6 7 Oscilloscope troubleshooting tree page 3 of 4 6 26 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Inst
16. Channel 2 FFT 4 channel units TDS20X4C Channel 3 Channel 4 Channel 4 Channel 3 Channel 3 Channel 4 Channel 3 Channel 4 Mean Cyc RMS Peak to Peak Max Min RMS CursorRMS x DC Gain Accuracy Sample or Average This is the difference between the measured DC gain and the nominal DC gain divided by the nominal DC gain and expressed as a percent Acquisition 3 5 Vidiv through 10 mV div 4 5 mV div and 2 mV div DC Voltage Vertical position 0 3 of reading 0 1 div 1 mV Measurement Accuracy Vertical position 0 and vertical scale 2 mV div to 200 mV div 3 of reading vertical position Average Acquisition Mode Delta Volts Measurement Accuracy Average Acquisition Mode 1 of vertical position 0 2 div 7 mV Vertical position 0 and vertical scale gt 200 mV div 3 of reading vertical position 1 of vertical position 0 2 div 175 mV Delta volts between any two averages of 16 waveforms acquired under the same setup and ambient conditions 3 of reading 0 05 div Analog Bandwidth Defined in Section 4 6 of IEEE std 1057 The difference between the upper and lower frequencies at which the amplitude response as seen in the data record is 0 707 3 dB of the response seen in the data record at the specified reference frequency Specifies only the 3 dB point It does not include the in band response TDS2000C and TDS1000C EDU Series Oscil
17. DC Voltage 1 0 32 V 9 DC Voltage 1 0 2 V 10 DC Voltage 1 0 16 V 11 DC Voltage 1 0 08 V 12 DC Voltage 1 0 04 V 13 DC Voltage 1 0 03 V 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 1 0 2 V 23 DC Voltage 1 0 32 V 24 DC Voltage 1 0 4 V 25 DC Voltage 1 0 8 V 26 DC Voltage 1 1 2 V 27 DC Voltage 1 1 6 V 28 DC Voltage 1 2 0 V 29 DC Voltage 1 20 0 V 30 DC Voltage 1 0 0 V Ext Trig DC voltage 2 31 DC Voltage 2 5 0 V 32 DC Voltage 2 1 0 V 33 DC Voltage 2 1 0 V 34 DC Voltage 2 5 0 V TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 5 5 Adjustment Procedures Table 5 2 Adjustment steps cont Input Setup diagram Step number Signal Signal source setting Ch 1 Sinewave 35 Sinewave Generator 50 Q 5 kHz 1 Vp p generator 36 Sinewave Generator 50 Q 1 MHz 100 mV 37 Sinewave Generator 50 Q 1 MHz 1 Vp p 38 Sinewave Generator 50 Q 50 kHz 1 Vp p 39 Sinewave Generator 50 Q 20 MHz 1 Vp 40 Sinewave Generator 50 Q BWL 25 mV 41 Sinewave Generator 50 Q BWL 50 mV 42 Sinewave Generator 50 Q BWL 100 mV 43 Sinewave Generator 50 Q BWL 250 mV p 44 Sinewave Generator 50 Q BWL 500 mV 40 Sinewave Generator 50 Q BWL 1 Vp 46 Sinewave Generator 50 Q 5 kH
18. Display cable j 4 To J1 on the Front Panel module Display Adapter power supply cable Display Adapter assembly J204 LCD backlight cable Power supply ground wire EN 0446 010 Figure 8 3 Power supply module cables and wires 2 ch model shown with 4 ch model in circle TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 8 9 Replaceable Parts Table 8 5 Replaceable parts list back case and trim Fig amp Tektronix Serial Serial index part no no number number effective discontd Qty Name amp description 8 4 BACK CASE TRIM 1 202 0438 00 1 REAR CASE ASSY COVER WITH FEET AND HANDLE all TDS1000C EDU Series models 850 0154 00 1 REAR CASE ASSY COVER WITH FEET AND HANDLE all TDS2000C Series models 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 MACHINE 6 32 X 0 250 PNH STL ZNPL T 15 TORX DR 5 200 5105 00 2 COVER ESD PROTECTION 6 366 0856 00 1 PUSH BUTTON POWER 7 211 1273 00 5 SCREW PT K35 1 57 PAN HEAD T 15 8 10 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Removing LN the rear feet 4 Sal Bottom view To remove or install foot squeeze at notches and swing one hinge free of slot or into place Chassis Sy Removing the i front feet e Keypad Figure 8 4 Exploded diagr
19. Ex eed gere SEE TUR Ted vi Service Safety SUMMI renier eir oiee eE imu be end atado Weste ae ee Eee doen ia tecta des pipe qeu ends viii lustre HM ix Manual Conventiofis iere sb Sue eria stadia eh ehe HON Kr edu detinet Eds eR dilexi ettet ix Related Documentation 5 ect tret rone ER Ee ER setit nn s NUO EARS T ee CRF EEE Peres ix Specifications Specifications E 1 1 Signal Acquisition System Characteristics ccccee cece nee e eee errre neces e eee 1 1 Time Base NICE TEL 1 7 Triggering System vi eacchavs TEE 1 9 Display Specifications oooieec tusan Les eeu Ree beaddudeaeaauaacubobnmaddoadadenhmuenaees 1 13 Interfaces and Output Ports Specifications c ccc ccc cece cece ence eee e eee eem 1 14 Data Handling Characteristics 0 ccc ccc cece eee nee eee m e eee eee 1 14 Power Distribution Systemi cce eee eere Eee nen nde contenu E Ed uae viri e be E Ried duce eie 1 14 Mechanical Characteristics sse e ee e eme me se se he he nen 1 15 Environmental Performance ssssssssssssesseseessese see eee e emen se se he e sen 1 15 Data Logging System Characteristics Not Available on TDS1000C EDU Models 1 15 Limit Testing System Characteristics Not Available on TDS1000C EDU Models 1 16 Where to Find Operating In
20. 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 are provided for probe adjustment External Trigger The Ext Trig channel is processed on the chain containing the highest numbered normal input channel Main Board Power To support various functions on the Main board several secondary power supplies are generated For the amplifier and acquisition ASICs the Main board creates a 2 5 V and 2 5 V supply The 42 5 V supply is derived from the 3 3 V logic supply The 2 5 V supply is derived from the 4 V supply One three terminal regulator provides 5 V for internal uses A second three terminal regulator provides USB power to preclude USB faults from seriously disrupting operation of the oscilloscope An additional power supply provides the LCD bias voltage which ranges from 19 to 28 V depending on contrast setting and display type This 28 V supply has a temperature sensor on the Front Panel board that varies the output voltage of the supply to maintain contrast over a wide temperature range TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 3 5 Theory of Operation Power Supply Display Module Front Panel 3 6 Two Channel Oscilloscopes Four Channel Oscilloscopes The main power supply module for these oscilloscopes is a wide input range universal supply It can provide about 25 W of power for
21. Manual General Safety Summary Do not operate in wet damp conditions Do not operate in an explosive atmosphere Keep product surfaces clean and dry Provide proper ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation Terms in This Manual These terms may appear in this manual WARNING Warning statements identify conditions or 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 the These terms may appear on the product Product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking B CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A QO CAUTION Protective Ground Earth Terminal Chassis Ground Mains Disconnected Mains Connected Refer to Manual Earth Terminal ASSIS Varoun OFF Power ON Power TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual vii Service Safety Summary Service Safety Summary viii Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone
22. Sample Filled In Vertical Position Accuracy Test Spreadsheet 0 cceeceeeceeeeeeeeeeenes A 1 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual iii Table of Contents List of Figures iv Figure 3 1 Figure 3 2 Figure 4 1 Figure 5 1 Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 Figure 6 9 Figure 7 1 Figure 8 1 Figure 8 2 Figure 8 3 Figure 8 4 Module level block diagram 2 channel 00 cco cce eee ee cece neces eee eee eene sean ena 3 2 Module level block diagram 4 channel 0 ccc sce e cece cee ee eee eee eee ene ena eens 3 3 Example of a line graph for the Vertical Position Accuracy test eeeee eee ees 4 13 Adjustment Setups eiris iri oor re REDE I ER TUR SERERE NEAN VER Eur FERE TE Ern e Leere Pens 5 3 Locator for trim and cabinet removal 4 channel model shown sssuuse 6 7 Locator for internal modules 4 channel model shown 0cceeeeeeeeeeee eee eees 6 7 Display Adapter board connections 0 ce cece cece cee ee cence ee eea meme 6 14 Connecting the Display cable cece cece cence ence cree eme mese 6 15 Oscilloscope troubleshooting tree page 1 of 4 0 c cece ccc ence ence eee eee eneneeneees 6 24 Oscilloscope troubleshooting tree page 2 Of 4 sss 6 25 Oscilloscope troubleshooting tree page 3 of 4 6 26 Oscilloscope trouble
23. View Diagrams for each procedure as indicated in the table Summary of Procedures Complete disassembly is best achieved by following the procedures in the order given in the following table Procedure Begins on page Rear Feet See page 6 8 Rear Feet Flip Feet See page 6 9 Flip Feet Front Panel Knobs See page 6 9 Front Panel Knobs Rear Case See page 6 10 Rear Case Front Feet See page 6 11 Front Feet Power Supply Module See page 6 12 Power Supply Module Internal Assembly Display Adapter Module See page 6 14 Display Adapter Module Front Panel Cable See page 6 17 Front Panel Cable Main Board Module See page 6 18 Main Board Module Display Module See page 6 20 Display Module Front Panel Module See page 6 21 Front Panel Module Keypad See page 6 13 Internal Assembly See page 6 22 Keypad 6 6 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance M Power button Cover ESD protection P buit Front Case A Oe assembly gt rad x lt 8 ea Soke i NS Rear foot Front flip foot 2 Front foot 0446 004 Figure 6 1 Locator for trim and cabinet removal 4 channel model shown Power supply assembly Display assembly Main board assembly Display adapter board Front panel assembly
24. are limited to 20 MHz bandwidth TDS1012C EDU DC to 2 100 MHz for 5 mV div through 5 V div settings with bandwidth limit at full 5 mV div settings are limited to 20 MHz bandwidth TDS1002C EDU DC to 2 60 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full 5 MV div settings are limited to 20 MHz bandwidth TDS1001C EDU DC to 2 40 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full 5 mV div settings are limited to 20 MHz bandwidth Analog Bandwidth DC Coupled Peak Detect typical This is the analog bandwidth when the instrument is DC coupled V div values are accurate for probe attenuation settings of 1X No probe should be installed for these measurements TDS1012C EDU TDS2012C TDS2014C TDS2022C TDS2024C DC to 2 75 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full Settings less than 5 mV div are limited to 20 MHz bandwidth TDS1002C EDU TDS2002C TDS2004C DC to 50 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full Settings less than 5 mV div are limited to 20 MHz bandwidth TDS1001C EDU TDS2001C DC to z 30 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full Settings less than 5 mV div are limited to 20 MHz bandwidth Analog Bandwidth Selections 20 MHz bandwidth limit ON OFF TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specif
25. ee messe 6 35 Table 6 11 Troubleshooting the Main board cc cece ence ence ence nee e ence ene e ease ene eeaeennees 6 37 Table 6 12 List of error cOdeS 00 cee cece eee e cece eee cence eee eee hehe enses een 6 38 Table 8 1 Replaceable parts list 0 ccc cece cece eee een eee ee e meme eese renes 8 2 Table 8 2 Replaceable parts list 2 channel models sess 8 3 Table 8 3 Replaceable parts list 4 channel models ccc sess 8 6 Table 8 4 Replaceable parts list power supply module cables and wires 0ceeeeeee eee 8 8 Table 8 5 Replaceable parts list back case and trim sss 8 10 Table A 1 Vertical position accuracy test spreadsheet nee A 1 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual v General Safety Summary General Safety Summary To Avoid Fire or Personal Injury vi Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures Use proper power cord Use only the power cord specified for this product and certified for the country of use Connect and disconnect properly Connect the probe output to the measurement instrument before connecting the probe to the circuit under test Connect the probe reference lead to the circuit under
26. following tables show the 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 Table 8 2 Replaceable parts list 2 channel models Figure and Serial Serial index Tektronix no no no part no effective discont d Qty Name and description 8 1 2 CHANNEL MODELS 1 202 0436 00 1 FRONT CASE ASSY COVER W FEET TDS1001C EDU TDS1002C EDU TDS1012C EDU 850 0156 00 1 FRONT CASE ASSY COVER W FEET TDS2001C TDS2002C TDS2012C TDS2022C 2 366 0863 00 1 ASSEMBLY KNOB 0 685 DIAMETER 3 366 0862 00 1 ASSEMBLY KNOB 0 470 DIAMETER 4 335 2308 00 1 MARKER IDENTIFICATION 2CH LANGUAGE FRENCH 335 2309 00 1 MARKER IDENTIFICATION 2CH LANGUAGE ITALIAN 335 2310 00 1 MARKER IDENTIFICATION 2CH LANGUAGE GERMAN 335 2311 00 1 MARKER IDENTIFICATION 2CH LANGUAGE SPANISH 335 2312 00 1 MARKER IDENTIFICATION 2CH LANGUAGE JAPANESE 335 2313 00 1 MARKER IDENTIFICATION 2CH LANGUAGE PORTUGUESE 335 2314 00 1 MARKER IDENTIFICATION 2CH LANGUAGE SIMPLIFIED CHINESE 335 2315 00 1 MARKER IDENTIFICATION 2CH LANGUAGE TRADITIONAL CHINESE 335 2316 00 1 MARKER IDENTIFICATION 2CH LANGUAGE KOREAN 335 2317 00 1 MARKER IDENTIFICATION 2CH LANGUAGE RUSSIAN 5 260 2904 70 1 SWITCH KEYPAD ELASTOMERIC FRONT PANEL 2CH COLOR BONDED 6 211 1272 00 9 SCREW MACHINE 6
27. power supply module at J101 on the Main board module The following table lists the voltages you should expect to see Table 6 11 Troubleshooting the Main board Maximum J101 power J101 return Derived Supply Voltage range current draw pins pins supplies 35 V 30 Voc to 40 Voc floating Pin 2 connected 15 mA 1 2 28 V LCD to 3 3 V on the Main board 6 V 5 5 V to 6 5 V 1 0 A 4 3 5 8 10 5 V 3 3 V 3 0 V to 3 6 V Requires minimum load to 1 8A 6 7 3 5 8 10 3 3 V 2 5 V maintain regulation 4 V 5 0 V to 3 5 V 0 8 A 9 3 5 8 10 25V Line 2 V to 6 V open circuit 1 mA 11 3 5 8 10 Line trigger trigger 1 diode drop when attached to the Main board 1 With 3 W minimum load still functions with no load 3 Ifall of the voltages are present the Main board is probably defective Replace it Running Diagnostics The oscilloscope runs an extensive self diagnostic routine at every power on Running the diagnostics from the Service menu will provide no additional information and therefore is not needed The menu selections are only used during manufacturing of the oscilloscope Troubleshooting Input Follow these steps to troubleshoot the input connections only if the oscilloscope Connections X appears to function normally in every way but an input signal is not getting into the oscilloscope as expected TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Troubleshooting the USB
28. power supply cable J202 Display Adapter board J101 J204 J201 LCD backlight LCD data Able AC ground A cable lug Power supply module 0446 007 Figure 6 3 Display Adapter board connections 3 Disconnect the LCD data cable from the Display Adapter board 4 Disconnect the LCD backlight cable from the Display Adapter board at J204 5 Disconnect the Display Adapter board power cable from the Display Adapter board at J202 6 14 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance 6 Remove the four screws that hold the Display Adapter board to the chassis and save the screws for installation of the replacement board 7 Loosen the Display Adapter board and disconnect the display cable at J201 8 Remove the Display Adapter board from the chassis Installation 1 Connect the display cable to the Display Adapter board at J201 See Figure 6 3 2 Position the Display Adapter board on the instrument chassis and align the board with the holes in the chassis 3 Use the four screws that were removed to attach the Display Adapter board to the chassis 4 Connect the Display cable to J201 on the Main board as shown in the figure For the 4 channel models make sure that the two ferrite EMI suppressors are attached as shown See Figure 6 4 2 Channel 4 Channel a 0446 006 EMI suppression ferrite 2 Figure 6 4 Connecting the Display cable 5 Attach the Display cable t
29. prevent damage from electrical arcing make sure that circuit boards and components are dry before applying power to the oscilloscope TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 3 Maintenance Table 6 2 Internal inspection checklist Item Inspect for Repair action Circuit boards Loose broken or corroded solder Remove and replace damaged circuit board connections Burned circuit boards Burned broken or cracked circuit run plating Resistors Burned cracked broken blistered Remove and replace damaged circuit board condition Solder connections Cold solder or rosin joints Resolder joint and clean with isopropyl alcohol Capacitors Damaged or leaking cases Corroded Remove and replace damaged circuit board solder on leads or terminals Wiring and cables Loose plugs or connectors Burned broken Firmly seat connectors Repair or replace or frayed wiring modules with defective wires or cables Chassis Dents deformations and damaged Straighten repair or replace defective hardware hardware Cleaning Procedure Interior 6 4 To clean the oscilloscope interior perform the following steps 1 2 Blow off dust with dry low pressure deionized air approximately 9 psi Remove any remaining dust with a lint free cloth dampened in isopropyl alcohol 75 solution and then wipe with a lint free cloth dampened with warm deionized water A cotton tipped applica
30. the oscilloscope while allowing the input to run from about 90 V to 264 V Input frequency ranges from 47 Hz to 440 Hz which allows operation in virtually all countries in the world and in several off grid environments such as power on military aircraft The secondary supplies from the power supply and the approximate current draws are listed in a table with the associated connector pins on J101 See Table 6 5 The P2 connector uses 4 positions and 3 wires which are 6 V 3 3 V and GND For information on voltages used in the oscilloscope refer to the Troubleshooting section of this manual The color display module is a standard passive liquid crystal display LCD The unit is patterned with 320 columns x 3 sub columns by 240 rows and has the associated drivers and backlight The LED backlight output is about 75 mA at 15 5 V You can manipulate all of the switches and position encoders on the Front Panel board of 2 channel oscilloscopes Several LEDs are used to indicate when the Multipurpose knob is active when Autorange is active and when a Save action is in progress For more information on the LEDs refer to the user manual for your product An 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 lines resets the scan a second line clocks the scan to the next position and the s
31. to repackage the oscilloscope for shipment or storage Use a corrugated cardboard shipping carton having a test strength of at least 125 kg 275 pounds and with an inside dimension at least 15 25 cm six inches greater than the oscilloscope dimensions Make sure that the oscilloscope is adequately padded with a cushioning material like foam paper or bubble wrap The oscilloscope should not move around inside the carton when the carton is sealed If the oscilloscope is being shipped to a Tektronix Service Center enclose the following information m The owner address B Name and phone number of a contact person Type and serial number of the oscilloscope Reason for returning B A complete description of the service required Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and also your own return address on the shipping carton in two prominent locations The oscilloscope should be stored in a clean dry environment The following environmental characteristics apply for both shipping and storage oscilloscope not operating Temperature range 40 C to 71 C 40 F to 159 8 F m Altitude To 3 000 m approximately 10 000 ft The chapter on Specifications lists the environmental characteristics See page 1 1 Specifications TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Diagrams This section describes the electrical operation
32. to use you can use the data logging menu to set up the oscilloscope so that it will save all of the triggered waveform to a USB memory device within a time duration that you have set TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 15 Specifications Table 1 10 Data logging system characteristics not available on TDS1000C EDU models Characteristic Description Duration The time period 30 min 1 hour 1 5 hour 2 hour 2 5 hour 3 hour 3 5 hour 4 hour 4 5 hour 5 hour 5 5 hour 6 hour 6 5 hour 7 hour 7 5 hour 8 hour Source The signal source which you want to save the waveform Channel 1 Channel 2 Channel 3 Channel 4 Math Select Folder The file folder where you save the waveform data You can create the new folder or change the existing folder as the folder where you want to save the waveform data Limit Testing System Characteristics Not Available on TDS1000C EDU Models NOTE This software feature directs the oscilloscope to monitor an active input signal against a template and to output pass or fail results by judging whether the input signal is within the bounds of the template Table 1 11 Limit testing system characteristics not available on TDS1000C EDU models Characteristic Description Source The signal source which you want to do the limit testing Channel 1 Channel 2 Channel 3 Channel 4 Math Compare Ref Channel The reference channel wher
33. 04C TDS2012C TDS2014C TDS2022C TDS2024C TDS1001C EDU 50 sec div to 5 uS div 13 ms TDS2001C These are the ranges of the user settable input offset voltage Volts Div Setting Position Range 2 mV div to 200 mV div 18V gt 200 mVidiv to 5 V div 45V TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 5 Specifications Table 1 1 Signal acquisition system characteristics cont y Vertical Position Accuracy This is the accuracy of the nominal voltage level represented by the code at the vendor of the A D converter s dynamic range Volts Div Setting Position Accuracy 2 mV div to 200 mV div 1 of selected value 0 1 div 5 mV within the range 11 8 V gt 200 mV div to 5 V div 1 of selected value 0 1 div 125 mV within the range 45 V Common Mode Rejection Ratio CMRR typical With the same signal applied to each channel CMRR is the ratio of the acquired signal amplitude to the amplitude of the MATH difference waveform either Channel 1 Channel 2 Channel 2 Channel 1 Channel 3 Channel 4 or Channel 4 Channel 3 Model Common Mode Rejection Ratio TDS1012C EDU 100 1 at 60 Hz reducing to 10 1 with 50 MHz sine wave with equal TDS2012C Volts Div and Coupling settings on each channel TDS2014C TDS2022C TDS2024C TDS1001C EDU 100 1 at 60 Hz reducing to 20 1 with a sine wave with frequency equal to TDS1002C EDU the 3 dB bandwidth and with equal Vo
34. 148 0 014 41 0 44 0 44 0 44 0 000 0 0144 0 0144 0 014 42 0 40 0 4 0 401 0 001 0 014 0 014 0 013 43 0 36 0 36 0 361 0 001 0 0136 0 0136 0 013 44 0 32 0 32 0 32 0 000 0 0132 0 0132 0 013 45 0 28 0 28 0 281 0 001 0 0128 0 0128 0 012 46 0 24 0 24 0 244 0 004 0 0124 0 0124 0 008 47 0 20 0 2 0 204 0 004 0 012 0 012 0 008 48 0 16 0 16 0 163 0 003 0 0116 0 0116 0 009 49 0 12 0 12 0 123 0 003 0 0112 0 0112 0 008 50 0 08 0 08 0 083 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 0 011 55 0 12 0 12 0 118 0 002 0 0112 0 0112 0 009 56 0 16 0 159 0 159 0 000 0 01159 0 01159 0 012 57 0 20 0 199 0 198 0 001 0 01199 0 01199 0 011 58 0 24 0 239 0 238 0 001 0 01239 0 01239 0 011 59 0 28 0 279 0 274 0 005 0 01279 0 01279 0 008 60 0 32 0 319 0 314 0 005 0 01319 0 01319 0 008 61 0 36 0 359 0 353 0 006 0 01359 0 01359 0 008 62 0 40 0 399 0 393 0 006 0 01399 0 01399 0 008 63 0 44 0 439 0 432 0 007 0 01439 0 01439 0 007 64 0 48 0 48 0 473 0 007 0 0148 0 0148 0 008 65 0 52 0 52 0 513 0 007 0 0152 0 0152 0 008 66 0 56 0 56 0 552 0 008 0 0156 0 0156 0 008 67 0 6 0 6 0 592 0 008 0 016 0 016 0 008 68 0 64 0 64 0 633 0 007 0 0164 0 0164 0 009 69 0 68 0 68 0 673 0 007 0 0168 0 0168 0 010 70 0 72 0 72 0 713 0 007 0 0172 0 017
35. 2 0 010 71 0 76 0 76 0 754 0 006 0 0176 0 0176 0 012 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual A 3 Appendix A Example of a Vertical Position Accuracy Test Spreadsheet Table A 1 Vertical position accuracy test spreadsheet cont 72 0 80 0 8 0 794 0 006 0 018 0 018 0 012 73 0 84 0 84 0 835 0 005 0 0184 0 0184 0 013 74 0 88 0 88 0 875 0 005 0 0188 0 0188 0 014 15 0 92 0 92 0 915 0 005 0 0192 0 0192 0 014 76 0 96 0 96 0 956 0 004 0 0196 0 0196 0 016 TT 1 00 1 0 996 0 004 0 02 0 02 0 016 78 1 04 1 04 1 04 0 000 0 0204 0 0204 0 020 79 1 08 1 08 1 08 0 000 0 0208 0 0208 0 021 80 1 12 1 12 1 12 0 000 0 0212 0 0212 4 0 021 81 1 16 1 16 1 16 0 000 0 0216 0 0216 0 022 82 1 20 12 12 0 000 0 022 0 022 0 022 83 1 24 1 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 87 140 14 14 0 000 0 024 0 024 0 024 88 144 144 144 0 000 0 0244 0 0244 0 024 89 1 48 1 48 1 48 0 000 0 0248 0 0248 0 025 90 1 52 1 52 1 52 0 000 0 0252 0 0252 0 025 91 1 56 1 56 1 56 0 000 0 0256 0 0256 0 026 92 1 60 1 6 1 6 0 000 0 026 0 026 0 026 93 1 64 1 64 1 64 0 000 0 0264 0 0264 0 026 94 1 68 1 68 1 68 0 000 0 0268 0 0268 0 027 95 1 72 1 72 1 72 0 000 0
36. 2 2 kg 4 9 Ibs with accessories 3 6 kg 8 Ibs when packaged for domestic shipment Size Height 158 mm 6 22 in Width 326 3 mm 12 85 in Depth 124 1 mm 4 88 in Cooling Method Convection cooled Environmental Performance Table 1 9 Environmental performance Characteristic Description Temperature Operating 0 C to 50 C 32 F to 122 F with 5 C minute maximum gradient noncondensing up to 3000 m altitude Nonoperating 40 C to 71 C 40 F to 159 8 F with 5 C minute maximum gradient Humidity Operating 5 to 85 relative humidity RH at up to 40 C 5 to 45 RH above 40 C up to 50 C noncondensing and as limited by a Maximum Wet Bulb Temperature of 37 C derates relative humidity to 45 RH at 50 C Nonoperating 5 to 85 relative humidity RH at up to 40 C 5 to 45 RH above 40 C up to 50 C noncondensing Above 50 C limited by a Maximum Wet Bulb Temperature of 37 C derates relative humidity to 12 RH at 71 C Altitude Operating Up to 3000 meters 10 000 feet Nonoperating Up to 3000 meters 10 000 feet Altitude is limited by possible damage to the LCD at higher altitudes This damage is independent of operation Data Logging System Characteristics Not Available on TDS1000C EDU Models NOTE This software feature directs the oscilloscope to automatically collect data over a period of time After you configure the trigger conditions
37. 23 Adjustment After Repair ssscesmensedaccees ene ente ERR dese RR SNR a REN EEES 6 23 Required Tools and Equipment 0 ccc cece nce e ee ence eee cence eee eee eme me eese 6 23 Troubleshooting Tree oes e erii setae Ee Pause cebigavan dear VE TRAN dees dense a 6 23 Probe Comp Outp t esee eret rh o n enel eaa as Ere esa ORA dut Tar e e xad 6 28 Troubleshooting the Power Supply ccccceccee cece cece neces e eme me eme 6 29 Troubleshooting the Display cesses me me emen e een 6 30 Troubleshooting the Backlight csssssssssssssssssssss eme emen 6 32 Troubleshooting the Front Panel ccc cece cece cece cee e ee eee ee eme me emen 6 34 Troubleshooting the Main Board 0 ccc cece cece ee ee cee eee eee eme eme emen 6 37 Repackaging Instructions iis3s secseeaes canes seeds re ee sande N CO E ET TIU DARE anid ree Er viue 6 40 DIA STAINS ERECTO 0 OT DTE 7 1 Replaceable Parts Replaceable Parts 2ac5is tsasdddasncinesunbicianded gal favecanaiobbahindddheidcanantouthmcsundaetdonakianthbies 8 1 Parts Ordering Information esses e e eme sms se he se enne 8 1 Using the Replaceable Parts List csssssssssssssssssseseeee e mee meme mene 8 2 Parts Lists and Exploded ViewS ccccccceccececeeeeeeeeeeeeeeeeeneeeeeeenaeeeneenaesensenaeeags 8 3 Appendix A Example of a Vertical Position Accuracy Test Spreadsheet ccceeeeeeeeee ees A 1
38. 8 11 2 Remove the internal assembly from the front case See page 6 13 Internal Assembly 3 Disconnect the front panel cable from J1 on the Front Panel module 4 Remove the five screws attaching the Front Panel module to the internal assembly 5 Pull the module away from the internal assembly Installation 1 Connect the front panel cable to J1 on the Front Panel module by pushing the cable straight down into the connector 2 Install the five screws to attach the Front Panel module to the internal assembly 3 Assemble the oscilloscope by performing the installation procedure for each module that was removed TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 21 Maintenance Keypad You will need a torque limiting Torx T 15 screwdriver for this procedure Refer to the exploded view diagram for the 2 channel models or the 4 channel models See page 8 5 See page 8 7 Removal 1 Remove the power button and rear case See page 6 10 Rear Case 2 Remove the internal assembly from the front case See page 6 13 Internal Assembly 3 Liftthe keypad switch out of the front case CAUTION Keep the electrical contacts on 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 into the front case using the guide posts and the holes in the keypad
39. DU Series Oscilloscope Service Manual 6 35 Maintenance Table 6 10 Expected signals at J202 cont Signal at J202 Description 10 FPDATA 34 P Front Panel Scan Data line B No fixed pattern Stable when triggered from FPCLR 34 P Pattern depends on rotation of knobs being scanned 11 FPCLR 34 P Front Panel Clock line B 405 kHz High with 50 ns pulses going low Each clock after FPCLR 34 P increments the scan location by one 12 FPCLK 34 P Clear Front Panel Scan line B 6 44 kHz Low pulsing high with 50 ns pulses 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 Front Panel board is probably defective Replace it 12 If some or all of the signals are missing continue with step 13 13 Turn off the oscilloscope and disconnect the front panel cable from the Main board at connector J202 14 Turn on the oscilloscope and check connector J202 for the same signals as in step 3 15 If some or all of the signals are missing the Main board is probably defective Replace it TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Troubleshooting the Main To troubleshoot the Main board acquisition module follow these steps Board 1 Remove the rear case See page 6 10 Rear Case 2 Use the test oscilloscope to measure the voltages from the
40. Do not perform internal service or adjustments of this product unless another person capable of rendering 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 Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Preface Manual Conventions Modules Replaceable Parts Safety This service manual provides information to verify performance of calibrate troubleshoot disassemble and replace parts on the TDS2000C and TDS1000C EDU Series Digital Storage Oscilloscopes Unless noted otherwise the term oscilloscope refers to all models in the TDS2000C and TDS1000C EDU series This manual uses certain conventions that you should become familiar with before attempting service Throughout this manual any replaceable component assembly or part is referred to by the term module A module is composed of electrical and mechanical assemblies circuit cards interconnecting cables and user accessible controls This manual refers to any field replaceable assembly or mechanical part specifically by its name or gen
41. E 335 2325 00 1 ARKER IDENTIFICATION 4CH LANGUAGE TRADITIONAL CHINESE 335 2326 00 1 ARKER IDENTIFICATION 4CH LANGUAGE KOREAN 335 2327 00 1 ARKER IDENTIFICATION 4CH LANGUAGE RUSSIAN 5 260 2905 70 1 SWITCH 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 4CH 389 3836 00 WIRED 8 441 2455 00 1 CHASSIS ASSY 4 CHANNEL 9 878 0391 70 1 CIRCUIT BD ASSY DISPLAY ADAPTER BOARD 389429600 BONDED 10 870 0564 01 1 CIRCUIT BD ASSY MAIN 4 CH 70 MHZ TESTED amp CONFIGURED COLOR 389 4132 00 WIRED TDS2004C 870 0565 01 1 CIRCUIT BD ASSY MAIN 4 CH 100 MHZ TESTED amp CONFIGURED COLOR 389 4132 00 WIRED TDS2014C 870 0566 01 1 CIRCUIT BD ASSY MAIN 4 CH 200 MHZ TESTED amp CONFIGURED COLOR 389 4132 00 WIRED TDS2024C 11 210 1039 00 5 WASHER LOCK 0 521 ID INT 0 025 THK STEEL ZINC FINISH 12 220 0265 00 5 NUT PLAIN HEX 0 5 28 X 0 625 HEX BRS NKL PL 13 211 1216 00 4 SCREW PAN HEAD PT T8 3MM X 1 34 X 4 3MM 14 850 0115 70 1 DISPLAY ASSY COLOR 15 348 1525 00 2 FOOT FRONT SANTOPRENE BLACK 64 DEROMETER TEXTURED 16 131 6417 00 1 CONTACT ELEC GROUNDING 0 600 L X 0 250 W X 0 220 D ELECTROLESS NICKEL PLATE 17 131 6521 00 1 CONTACT ELEC EMI CLIP ON 0 38 L X 0 460 W 2 CONTACTS X 0 45 HIGH ELECTROLESS NICKEL PLATE 8 6 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual
42. L 5 Vp p TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 5 7 Adjustment Procedures 5 8 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance This chapter contains the information needed to do periodic and corrective maintenance on the oscilloscope as well as repackaging instructions to use if you need to return the oscilloscope to Tektronix for service Preventing ESD Before servicing this product read the Safety Summary and Introduction at the front of the manual and the electrostatic discharge ESD information below N CAUTION Static discharge can damage any semiconductor component in this oscilloscope When performing any service which requires internal access to the oscilloscope adhere to the following precautions These precautions help you avoid damaging internal modules and their components due to electrostatic discharge ESD Minimize handling of static sensitive modules B Transport and store static sensitive modules in their static protected containers or on a metal rail Label any package that contains static sensitive modules m Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules B Service static sensitive modules only at static free workstations Do not allow anything capable of generating or holding a static charge on the workstation surface m Handle circuit boards by the edges when possib
43. SC 50Q BNC Cable BNC male to BNC male 1 m 36 in long Tektronix part number 012 0482 XX 500 BNC Cable BNC male to BNC male 25 cm 10 in long Tektronix part number 012 0208 XX 500 Feedthrough Termination Dual Banana to BNC Adapter BNC male and female connectors Banana plugs to BNC female Tektronix part number 011 0049 XX Tektronix part number 103 0090 XX BNC T Adapter BNC male to dual BNC female connectors Tektronix part number 103 0030 XX Splitter Power Adapter four required Frequency range DC to 4 GHz Tracking gt 2 0 Male N to female BNC Tektronix part number 015 0565 XX Tektronix part number 103 045 XX Adapter Female N to male BNC Tektronix part number 103 0058 XX Leads 3 Black Stacking Banana Plug Patch Cord 45 cm 18 in long Pomona B 18 0 Leads 2 Red Stacking Banana Plug Patch Cord 45 cm 18 in long TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Pomona B 18 2 4 1 Performance Verification Test Record Table 4 2 Test record Instrument Serial Number Certificate Number Temperature RH Date of Calibration Technician Instrument performance test Minimum Incoming Outgoing Maximum Channel 1 5 mV div 33 6 mV 36 4 mV DC Gain Accuracy 200 mV div 1 358 V 1442 V 2 Vidiv 13 58 V 14 42 V Channel 2 5 mV div 33 6 mV 36 4 mV DC Gain A
44. TDS2000C and TDS1000C EDU Series Digital Storage Oscilloscopes Service Manual DULLDEUEH EET TUE Tektronix 077 0446 01 S TDS2000C and TDS1000C EDU Series Digital Storage Oscilloscopes Service Manual 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 do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com Tektronix 077 0446 01 Copyright Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in 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 registered trademark of Tektronix Inc Contacting Tektronix Tektronix Inc 14150 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Table of Contents General Safety Summary iis er tr enis Ede o Panne heeds TURAE Ee e
45. all a compatible USB flash drive in E from Troubleshooting Tree page 1 the front panel port Does the No Replace the flash drive Main board blink Examine the contents of the flash drive through the file controls Does the data match what is visible on the PC No Check that the TekVISA software OpenChoice PC Communications is installed on the PC Does the data match what is visible on the oscilloscope Connect the oscilloscope to the PC Transfer data from the oscilloscope to the PC Good oscilloscope The oscilloscope displays a clock symbol when the flash drive is active and a hint line when a save or recall operation is complete Figure 6 8 Oscilloscope troubleshooting tree page 4 of 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 27 Maintenance Probe Comp Output When the oscilloscope is on and operating properly the Probe Comp output should generate a square wave approximately 5 V in amplitude at a 1 kHz frequency Use the oscilloscope and use a 10X TPP0101 or TPP0201 probe to probe this output As shown in the following table there are two cases of defects Either the 1 kHz signal is on and the power supply and Main board are both active and functionally capable of doing 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 t
46. am back case and trim TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Use care to avoid touching the electrical contacts E A ee Py Replaceable Parts 8 12 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Appendix A Example of a Vertical Position Accuracy Test Spreadsheet This appendix contains a filled in example of the vertical position accuracy VPA test spreadsheet that is used See page 4 10 Check Vertical Position Accuracy The PDF version of this service manual Tektronix part number 077 0446 01 includes an empty VPA test spreadsheet for your convenience To access and save the test spreadsheet 1 Go to the Tektronix manuals Web site www tektronix com manuals 2 Enter 077044601 in the Search Manuals field and click Go 3 Click Download for the TDS2000C and TDS1000C EDU Series Digital Storage Oscilloscopes Service Manual Tektronix part number 077044601 and follow the instructions to download the file to your PC 4 Open the PDF file in Adobe Reader version 7 or later 5 Click the Attachments tab or click View gt Navigation Panels gt Attachments to display the Attachments panel 6 Double click the VPA Test Table xls file 7 Click OK in the Launch Attachment dialog box The test spreadsheet opens in your spreadsheet application and shows the Blank Test Record spreadsheet tab 8 Click File gt Save As to save the file to a name and location tha
47. and the Adjustment setup table for the remainder of the routine applying the proper signal for each step See Table 5 2 NOTE During some steps the oscilloscope may appear to be idle for several minutes while it is processing information internally You must wait for the screen prompt to continue 12 13 14 15 5 4 If any step in the procedure fails the procedure terminates Failure will result if an incorrect signal source is connected If this happens you must start the procedure over from the beginning If the procedure completes successfully a Pass message is displayed and the new adjustment takes effect Compensate the signal path by performing the self calibration routine Disconnect all probes and cables from the channel input connectors Press the Utility button and select Do Self Cal to confirm that you are ready to proceed Disable the Service menu option by pushing the Utility front panel button and the Service and Service Mode Off option buttons TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Table 5 2 Adjustment steps Adjustment Procedures Input Setup diagram Step number Signal Signal source setting Ch 1 through DC voltage 1 1 DC Voltage 1 0 0 V Ch x 2 DC Voltage 1 20 0 V 3 DC Voltage 1 20 V 4 DC Voltage 1 46V 5 DC Voltage 1 1 2 V 6 DC Voltage 1 0 8 V 7 DC Voltage 1 0 4 V 8
48. ar case and press the foot in TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Flip Feet You will need a pair of needle nose pliers to remove the flip feet Refer to the exploded view diagram See page 8 11 Removal 1 Place the oscilloscope face down on a soft surface such as an anti static mat 2 Grip the flip foot with the pliers as close to the notches as possible and squeeze gently on the foot 3 Twist slightly to swing one hinge free of the slot 4 Remove the flip foot from the case Installation 1 Place the oscilloscope face down on a soft surface such as an anti static mat 2 Hold the flip foot with the smooth side facing down 3 Gently squeeze the foot so that the hinge on one side fits into the slot and twist slightly to snap 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 8 5 See page 8 7 NOTE Wrap the plier jaws with tape such as electrical tape to avoid scratching the knob Removal Firmly grasp the knob with pliers if necessary and pull it away from the front panel Installation Align the keyed knob with the shaft and press the knob onto the shaft Power Button Refer to the exploded view diagram for either the 2 channel or the 4 channel models See page 8 5 See page 8 9 NOTE Wrap the plier jaws with tape such as electrical tape to avoid scratchi
49. at are smaller than the guardband width offsetting the center should allow discriminating differences down to the guardband accuracy Not Equal Guardband 330 ns lt 1 5 x guardband lt 5 1 16 5 ns 165 ns lt 1 lt 330 ns guardband 16 5 ns 33 ns t lt 165 ns guardband 16 5 ns 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 provide an arbitrary guardband Any measured pulse width outside the guardband will qualify If you are looking for pulse width differences that are smaller than the guardband width offsetting the center should allow discriminating differences down to the guardband accuracy Not equal has slightly better ability to deal with small pulse widths than equal The accuracy is not better Pulse Width Trigger Point Equal The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level Not Equal If the pulse is narrower than the specified width the trigger point is the trailing edge Otherwise the oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width Less than The trigger point is the trailing edge Greater than also called the time out trigger The oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width Trigger Frequency Counter Trigge
50. at J201 on the Main board Carefully pull the cable straight up from the connector to avoid damage 7 Turn on the oscilloscope 8 Probe the pins of J201 checking for the same signals as in step 3 9 Ifany ofthe signals are missing the Main board module is probably defective Replace it TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 31 Maintenance Troubleshooting the To troubleshoot a nonfunctional backlight follow these steps Backlight 1 Remove the rear case See page 6 10 Rear Case 2 Turn on the oscilloscope 3 Check that the power supply P2 connector generates 3 3 V and 6 V If either reading is not correct the power supply module is probably defective Replace it WARNING To avoid electrical shock do not touch the backlight connectors J204 on the Display Adapter board See Figure 6 4 5 Check that the voltage output between J204 1 and J204 6 on the Display Adapter board generates around 15 5 V If the reading is not correct the Display Adapter module is probably defective Replace it 6 32 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance 6 Check that the current output at J204 of the Display Adapter board for each wire is around 25 mA If the reading is not correct the Display Adapter module is probably defective Replace it Main board assembly J202 Display cable To J1 on the A d Front Panel module Display Adapter power suppl
51. ata logging system characteristics not available on TDS1000C EDU models 1 16 Table 1 11 Limit testing system characteristics not available on TDS1000C EDU models 1 16 Table 4 1 Performance verification ssssssssssssssssssssses esee e he eee se he nnn 4 T able 432 Test reCord cie iraan er eR te ERR E NES EE OE res usui ek HR REN ees 4 2 Table 5 1 Required equipment 66 ccc ccc eee enn se eme e messe sess 5 1 Table 5 2 Adjustment steps 0 0 cece cece een mense messe e esee sene nnns 5 5 Table 6 1 External inspection checklist 0 ccc ccc cece cece e eee eee e eee eme menn 6 3 Table 6 2 Internal inspection checklist esses e menn 6 4 Table 6 3 Tools and equipment cece cece cee eee een nnn mme mene 6 23 Table 6 4 Probe Comp output issssssssssssssssssssssssee e ees sme ee se s eene 6 28 Table 6 5 Troubleshooting the power supply sssssssssssssssesse Hee 6 29 Table 6 6 Troubleshooting the display sss eme ene 6 30 Table 6 7 Troubleshooting the front panel service ssssssssssssssssss eeneennees 6 34 Table 6 8 Troubleshooting the front panel Service Diag cece ccc cece eee e ence nese eaeennees 6 34 Table 6 9 Troubleshooting the front panel Mfg test ccc cece ccc e ccc e nce e nsec scenes eneennees 6 34 Table 6 10 Expected signals at J202 cece ccc e cece cece ence mme me
52. 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 Support the BNC to prevent it from twisting the Main board and torque the nuts to 40 in Ibs 4 5 N m using the torque wrench 3 Install the three screws attaching the Main board module to the internal assembly TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance 4 Connect the following cables on the Main board The power supply cable at J101 The display cable at J201 The front panel cable at J202 5 Assemble the oscilloscope by performing the installation procedure for each module that was removed TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 19 Maintenance Display Module AN You will need a torque limiting Torx T 15 screwdriver a torque limiting Torx T 8 screwdriver and pliers for this procedure Refer to the exploded view diagram for the 2 channel or the 4 channel models See page 8 5 See page 8 7 CAUTION Do not separate the display shield from the display module Removing t
53. cal position known as offset in these oscilloscopes is set to 0 divisions or a grounded input will show screen center m Vertical Position Accuracy Identifies errors mostly from the position control made when the vertical position is set to a non zero value 4 10 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification The two attenuator settings operate identically so verification of the attenuation range from 1 8 V to 1 8 V also verifies the attenuation range of 45 V to 45 V 1 Set up the oscilloscope as shown in the following table Push menu button Select menu option Select setting Default Setup Channels 1 2 3 4 Probe 1X Channels 1 2 3 4 Volts Div 50 mV div Trig Menu Source Ext Mode Auto Acquire Sample Measure Source Channel under test Type Mean 1 The test operates without a trigger To maintain uniformity and to avoid 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 equations The values in columns B C D E F and G are examples of the measured or calculated values The PDF version of the service manual which you can download from www tektronix com manuals includes an empty spreadsheet for your convenience To access and save the test spreadsheet see the instructions in Appendix A Examp
54. ccuracy 200 mV div 1 358 V 1 442 V 2 Vidiv 13 58 V 14 42 V Channel 3 5 mV div 33 6 mV 36 4 mV DC Gain Accuracy 200 mVidiv 1 358 V 1442 V 2 Vidiv 13 58 V 14 42 V Channel 4 5 mV div 33 6 mV 36 4 mV DC Gain Accuracy 200 mVidiv 1 358 V 1 442 V 2 Vidiv 13 58 V 14 42 V Channel 1 Bandwidth 2 12 V Channel 2 Bandwidth 2 12 V 2 Channel 3 Bandwidth 1 2 12 V Channel 4 Bandwidth 1 2 12 V Sample Rate and Delay Time Accuracy 2 divs 2 divs Channel 1 Edge Trigger Sensitivity Stable trigger E Channel 2 Edge Trigger Sensitivity Stable trigger m Channel 3 Edge Trigger Sensitivity 1 Stable trigger 3 Channel 4 Edge Trigger Sensitivity 1 Stable trigger 3 External Edge Trigger Sensitivity Stable trigger Channel 1 Vertical Position Accuracy 0 Minimum margin Channel 2 Vertical Position Accuracy 0 Minimum margin Channel 3 Vertical Position Accuracy 1 0 Minimum margin Channel 4 Vertical Position Accuracy 0 Minimum margin 1 Channels 3 and 4 are only available on four channel oscilloscopes 2 The bandwidth test does not have a high limit 3 The limits vary by model Check the procedure for the correct limits 4 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification Performance Verification Procedures Before beginning these procedures two conditions must be met The oscilloscope must have been operating continuously for twenty minutes within the operating temperature range sp
55. d I4 Pos 10 00ms lt X Acceptable limits Vertical center graticule line Horizontal center graticule line NOTE One division of displacement from graticule center corresponds to a 25 ppm time base error 11 Disconnect the test setup Check Edge Trigger This test checks the edge trigger sensitivity for all input channels Sensitivity 1 Setup the oscilloscope using the following table Push menu button Select menu option Select setting Default Setup ES Channel 1 Probe 1X Trig Menu Mode Normal Acquire Sample Measure Source Channel under test Type Pk Pk TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 7 Performance Verification 2 Connect the oscilloscope channel under test to the leveled sine wave generator as shown in the following figure Leveled sine wave Digitizing oscilloscope generator PROR O em St a e CD 270000 o ooo oc a ae O Output mu O09 o O 50 Q feedthrough terminator BNC cable Set the oscilloscope Vertical Scale volts division to 500 mV div Set the oscilloscope Horizontal Scale seconds division to 25 ns div Set the leveled sine wave generator frequency to 10 MHz gc uem e Set the leveled sine wave generator output level to approximately 500 mV p p so that the measured amplitude is approximately 500 mV The measured amplitude ca
56. e 2 Disconnect the following wires The ground wire on the power supply module from the chassis ground lug The display adapter power supply cable from P2 The power supply cable on the Main board at J101 Press down on the latch while pulling up on the cable 3 Remove the five screws that connect the power supply module to the chassis and lift the module from the internal assembly 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 connector mounting holes 3 Install the three shorter screws through the power supply and into the chassis 4 Connect the following wire and cables See Figure 6 3 The ground wire on the power supply module to the chassis ground lug You may need to use pliers to secure the wire in place The display adapter power supply cable at P2 7 The power supply cable to the Main board at J101 Twist the cable to keep it from contacting the boards and chassis NOTE Wind up the power supply cable until it is tight loops are okay This keeps the cable bundle together 5 Assemble the oscilloscope by performing the installation procedure for each module that was removed 6 12 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Internal Assembly You will need a torque limiting Torx T 15 screwdriver and a pair of pliers for this procedure Refer to the exploded vie
57. e 11 5 cm width 8 64 cm height 14 3 cm diagonal 5 7 QVGA active TFT color liquid crystal display LCD with color characters waveforms on a black background Surface antiglare 3H treatment Display Resolution This is the number of individually addressable pixels 320 horizontal by 240 vertical pixels The video display contains both the character and waveform displays Brightness typical This is the light output of the backlight 400 cd m typical 320 cd m min Contrast Ratio and Control typical Available black room contrast ratio full black to full white 400 minimum 500 typical TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 13 Specifications Interfaces and Output Ports Specifications Table 1 5 Interfaces and output ports specifications Characteristic Description USB Device USB 2 0 Full Speed device 12 Mb second maximum Supports PICTBRIDGE compatibility and provides USB TMC communications with Tektronix extensions Standard USB Host USB 2 0 Full Speed host 12 Mb sec maximum Supports USB Mass Storage Class Bulk Only Subclass only Provides full 0 5 A of 5 V Standard USB Host Current Provides full 0 5 A of 5 V Standard GPIB Interface GPIB access via TEK USB 488 accessory Probe Compensator Output Voltage and Frequency typical Output voltage 5 0 V 10 into 1 MO load Frequency 1 kHz Data Handling Characteristics Tab
58. e 3 DI MEMORY diagnostics failed Main board or power supply failure 4 DI Ch 1 diagnostics failed Main board or power supply failure 5 DI Ch 2 diagnostics failed Main board or power supply failure 6 DI Line trigger diagnostics failed Main board or power supply failure 7 DI ADG421 diagnostics failed Main board or power supply failure 12 DI Ch 3 diagnostics failed Main board or power supply failure 13 DI Ch 4 diagnostics failed Main board or power supply failure 14 DI ADG421 2 diagnostics failed Main board or power supply failure 15 DI ADG522 2 diagnostics failed Main board or power supply failure 16 DI DRAM2 diagnostics failed Main board or power supply failure 17 DI USB diagnostics failed Main board or power supply failure 255 Software Contact Tektronix TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Clearing the error log To clear the error log after fixing a problem follow these steps 1 Enable the Service menus See page 5 2 Enable the Service 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 button to clear the error log of past failures This also sets the Power Cycle count to zero TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 39 Maintenance Repackaging Instructions 6 40 Packaging Storage Use these procedures
59. e the template is saved RefA RefB RefC RefD The limit testing system will compare the source signal with this template Run Stop Template Setup To enable or disable the limit testing function Run Stop You can use this menu item to set up a limit test waveform template The template is the mask signal that you define as the boundary to compare with the input source signal You can create the template from internal or external waveforms with specific horizontal and vertical tolerances Source The location of the signal source that is used to create the limit test template Channel 1 Channel 2 Channel 3 Channel 4 Math Vertical Limit The vertical limit in vertical divisions 0 1000 mdiv Horizontal Limit The horizontal limit in horizontal divisions 0 500 mdiv Destination Ref Channel The location of the reference memory location that is used to store the limit test template RefA RefB RefC RefD Display Template Displays or does not display a stored test template On Off TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Table 1 11 Limit testing system characteristics not available on TDS1000C EDU models cont Characteristic Description Action on Violation Defines the actions the oscilloscope will take after a violation is detected Save Image The oscilloscope will automatically save a screen image when a violation is detected Save Waveform The oscillosc
60. easurement is gt 2 12 V TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 5 Performance Verification Check Sample Rate Accuracy and Delay Time Accuracy 4 6 10 Disconnect the test setup 11 Repeat steps 1 through 10 for all input channels This test checks the time base accuracy 1 Setup the oscilloscope using the following table Push menu button Select menu option Select setting Default Setup Channel 1 Probe 1X 2 Connect the oscilloscope to the time mark generator as shown in the following figure Time mark Digitizing oscilloscope generator O Soa a e 20 0 Q O O Output 59 E o 50 Q feedthrough terminator BNC cable Set the time mark generator period to 10 ms Set the oscilloscope Vertical Scale volts division to 500 mV div Set the oscilloscope Main Horizontal Scale seconds division to 1 ms div Push Set To 50 Use the Vertical Position control to center the test signal on screen Use the Horizontal Position control to set the position to 10 00 ms Se opes c cw M me 9 Set the oscilloscope Horizontal Scale seconds division to 250 ns div TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification 10 Check that the rising edge of the marker crosses the center horizontal graticule line within 2 divisions of the vertical center graticule line as shown in the following figure Tria
61. ecified in the Environmental Performance table See Table 1 9 B You must perform the Self Calibration operation described below If the ambient temperature changes by more than 5 C you must perform the Self Calibration operation again The time required to complete the entire procedure is approximately one hour N WARNING Some procedures use hazardous voltages To prevent electrical shock always set voltage source outputs to 0 V before making or changing any interconnections Self Test This internal procedure is automatically performed every time the oscilloscope is powered on No test equipment 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 signal path for maximum measurement accuracy You can run the routine at any time but you should always run the routine if the ambient temperature changes by 5 C or more 1 Disconnect all probes and cables from the channel input connectors channels 1 2 3 4 2 Push the Utility button and select the Do Self Cal option to start the routine The routine takes approximately one minute to complete 3 Verify that self calibration passed Check DC Gain Accuracy This test checks the DC gain accuracy of all input channels 1 Setthe DC voltage source output level to 0 V 2 Setup the oscilloscope using the following table
62. ections within the flash PROM The processor system shares DRAM with the display system TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Theory of Operation Processing and Display The processing and display system consists of the display ASIC DRAM and System system oscillator Digitized acquisition samples are received by the display ASIC and stored in DRAM Once data are received by the display ASIC various corrections are applied display rasterization is performed and the waveform is placed in a display buffer At the same time the waveform is read from the display buffers and written to the LCD Additional circuitry in the display ASIC supports scanning the front panel handling DRAM refresh providing the processor clock and performing various memory mapping tasks required by all elementary microprocessor based systems In a 4 channel system the two display ASICs are interconnected so that one ASIC can provide display information for the second The processing and display system handles some of the computational tasks Other tasks are performed by the processor system Since all array processing is performed in the processing and display system no computations can be performed that involve data from two different channel sets Thus subtracting channel 3 data from channel 2 is prohibited Channel 1 and Channel 2 data may be combined in all of the supported ways Input Signal Interface BNC connectors are mounted on the
63. eek Poke For engineering use only Clear Error Log Removes all Error Log entries from memory and sets the power cycle count to zero 4 Select Mfg Tests to start the front panel controls test The following options appear Table 6 9 Troubleshooting the front panel Mfg test Menu Comments Test FP Displays a front panel simulation used to check the operation of all front panel controls All buttons must be pushed and all knobs must be turned in both directions before you can exit this test Test Screen Checks the display screen pixels with different patterns from each push of the button Contrast Allows you to check the display contrast operation across 100 of the hardware range TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Table 6 9 Troubleshooting the front panel Mfg test cont Menu Comments Warm up Timer Ensures a ten minute warm up time for the oscilloscope before executing the calibration procedure Stop Test Exits the front panel test Test FP and the screen test Test Screen 5 Select Test FP to start the front panel controls test 6 Push each button and rotate each knob to verify the operation of all controls If all buttons and knobs have passed the test pushing the lower menu button EXIT exits the test 7 If any button fails to operate inspect and or clean the switch keypad and the front panel board contac
64. ej Same as DC Coupled limits from DC to 7 kHz LF Ref Same as DC Coupled limits for frequencies above 300 kHz Since AC coupling is not done in the front end use of a 10M probe does not affect the low frequency corner Lowest Frequency for Successful Operation of Set Level to 50 Function typical 50 Hz Using a 10M probe will not affect the operation of this function Trigger Level Ranges typical Input Channel 8 divisions from center screen Ext 1 6V Ext 5 8 V The settable resolution for Trigger Level is 0 02 division for an input channel source 4 mV for Ext source and 20 mV for Ext 5 source Trigger Level Accuracy DC Coupled typical This is the amount of deviation allowed between the level on the waveform at which triggering occurs and the level selected for DC coupled triggering signals 0 2 div 5 mV for signals within 4 divisions from the center screen having rise and fall times of 2 20 ns Ext 6 of setting 40 mV for signals less than 800 mV Ext 5 6 of setting 200 mV for signals less than 4 V Video Trigger Default Settings for Video Trigger Trigger Mode Auto Trigger Coupling AC Video Trigger Source Selection Video Trigger Polarity Selection Same as Trigger Source Selections listed above except Line Trigger Line Trigger source is meaningless in this mode Normal Negative going Sync Signal Invert Positive going Sy
65. em cont Characteristic Description Delta Time Measurement This is the accuracy of delta time measurements made on any single waveform Accuracy The limits are given in the following table for signals having an amplitude 5 divisions a slew rate at the measurement points of 2 2 0 divisions ns and acquired 2 10 mV div Condition Time Measurement Accuracy Single shot sample mode 1 Sample Internal 100 ppm reading 0 6 ns full bandwidth selected gt 16 averages 1 Sample Internal 100 ppm reading 0 4 ns full bandwidth selected The Sample Interval is the time between the samples in the waveform record Time Measurement Frequency Period Rise Time Fall Time Positive Width negative Width Positive Duty Cycle Phase Functions Delay 1 8 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Triggering System Table 1 3 Triggering system Characteristic Description Trigger Types Edge Video Pulse Width Trigger Source Models Trigger source selections Selection TDS1001C EDU Channel 1 TDS1002C EDU Channel 2 TDS1012C EDU External TDS2001C External 5 TDS2002C AC Line TDS2012C TDS2022C TDS2004C Channel 1 TDS2014C Channel 2 TDS2024C Channel 3 Channel 4 External External 5 AC Line External 5 selection attenuates the external signal by 5 When Bandwidth Limit is selected for a channel the bandwidth of that channel s trigger path will also be limited T
66. ense line receives the current state of the selected switch or encoder position For the encoders some amount of debouncing occurs inside the front panel IC All key debouncing is handled in the display ASIC on the Main board The LEDs are controlled by latching the value of the Channel 1 2 front panel scan counter when the appropriate scan value is set The Front Panel board of the 4 channel units is effectively two panels in parallel The left side of the board is largely handled by the display ASIC for channels 1 and 2 The right side of the board is handled by the channel 3 and 4 ASIC Separate front panel ICs support these data paths TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification Performance Verification This chapter contains performance verification procedures for the specifications marked with the check mark The following equipment or a suitable equivalent is required to complete these procedures Required Equipment Table 4 1 Performance verification Description Minimum requirements Examples DC Voltage Source 17 5 mV to 7 V 0 5 accuracy Wavetek 9100 Universal Calibration Leveled Sine Wave Generator 50 kHz and 200 MHz 3 amplitude accuracy System with Oscilloscope Calibration Time Mark Generator 10 ms period 10 ppm accuracy Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option Option 5500A
67. erically as a replaceable part In general a replaceable part is any circuit board or assembly such as the hard disk drive or a mechanical part such as the I O port connectors that is listed in the replaceable parts list Symbols and terms related to safety appear in the Service Safety Summary found at the beginning of this manual Related Documentation To read about Use these documents Installation and The oscilloscope user manual available on the Tektronix Web Operation site Go to www tektronix com manuals and search for the user manual for your product available in 11 languages Programmer The oscilloscope programmer manual available on the Tektronix Commands Web site Go to www tektronix com manuals and search for the programmer manual for your product TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual ix Preface x TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Specifications These specifications apply to all TDS2000C and TDS1000C EDU series oscilloscopes To verify that an oscilloscope meets specifications it must first meet the following conditions m The oscilloscope must have been operating continuously for twenty minutes within the specified operating temperature You must perform the Do Self Cal operation accessible through the Utility menu if the operating temperature has changed by more than 5 C 9 F since the last time the Do Self Cal operatio
68. et ke ver a RP a e eed DU E NE reis 6 2 Exterior InspectiOl eet naue ree ox be EXER RENE RSR OSA E Ea RR RR EAS seu M CU baseEr S E EAE DES 6 3 Interior Inspection dence rre ret aux eee duse E E Dua UE Frei ERE POI UE reins 6 3 Cleaning Procedure Interior 00 cc cece cece e een nee TORE enn eme eene 6 4 Removal and Installation Procedures 0 ccc cece cece cence eee eee cent nee eee mee een 6 6 Summary of Procedures is c cccdisacscsedabratindndaal eaa E NEN bin aeddighiwens 6 6 Requited Tools EUER 6 8 hog 6 8 ldrcl Mm UUUEET 6 9 Front Panel KnODS I 6 9 ly cg 6 9 hocaer p M 6 10 l nuidu dL 6 11 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Table of Contents Power Supply Module sivcusiniidvannaiensenenknst ndamen nn PERENNE H OPERE bI M er A 6 12 Internal Assembly MESE Em 6 13 Display Adapter Module sssssssssssssssssssssssssee eem eene emen eene 6 14 Front Panel Cables scsncerchassasie oeri es entea ae daceaneen puseunele db GE EEEO 6 17 Main Board Module ccs erri re eR AER ee ARE E ERR TEE NT EAEE 6 18 Display Module issues rete eod E Tous SUP a Sa EE T DEAS NAE e ia UR S 6 20 Front Panel Module odi eo Fen RR RENE OR ORARE ERE ARR EA E CON ENS AS Rx TRREREE RAT NAT 6 21 Keypad mMEI M 6 22 Troubleshoot sacs isd pectes m 6
69. formation Where to Find Operating Information 0 0 ccc ccc cece cere eee eee meme me enne 2 1 Theory of Operation Theory RO ROJCUII MERE 3 1 System Level Block Diagrams 0 cc ccc cece ene enn mee mese emen 3 2 Maiti Board M 3 4 AcquisiDOon System o ost crece egeo ee RENE RR E amin E ERI fie ene MU IER ODIO Nd erbe tei is 3 4 Processing and Display System 0 0 0 c cece eee e cece eee e ence ee ese eee eene ees 3 5 Input Signal Interface osedr este doen re ende bti de o ree Due EEn causesees beddendensns 3 5 Probe Compensation 3 toe i bI oe Eo Ee Tue b RA SERENO SERE REIR SUPERO Oe du 3 5 External Trig Get d 3 5 Main Board Powet 5d Lt ioiei E a EEE E SE EEE EG 3 5 linis eU 3 6 Display Module es ee ee SERE Torte eigo ae Eo Fe uu me sede yep EET Us de 3 6 Front Panel M 3 6 Two Channel Oscilloscopes ssssssssssssssss e m mme mese 3 6 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual i Table of Contents Four Channel Oscilloscopes sssssssssssesssessse emm me emen messen 3 6 Performance Verification Performance Verification esris ce cese un hn era RA etaeua dy E ba e RR an daaa Ke DR ESREXSR FK ede diens 4 1 Required Equipment erobert e ead E E E a aera 4 1 Test R cord onei E AT O O E E E T R 4 2 Performance Verification Procedures essnsessnseesssensesrsrrsroesrrsersrsrrsr
70. gt 2 mV div 2 mV div 4 div from DC to 10 MHz 2 5 div from DC to 10 MHz 2 mV Div 2 mV Div TDS1001C EDU 3 div between 10 MHz 1 5 div between 10 MHz and and 40 MHz 40 MHz TDS1002C EDU 3 div between 10 MHz 1 5 div between 10 MHz and and 60 MHz 60 MHz TDS2001C 3 div between 10 MHz 1 5 div between 10 MHz and and 50 MHz 50 MHz TDS2002C 3 div between 10 MHz 1 5 div between 10 MHz and TDS2004C and 70 MHz 70 MHz TDS1012C EDU 3 div between 10 MHz 1 5 div between 10 MHz and TDS2012C and 100 MHz 100 MHz TDS2014C TDS2022C 3 div between 10 MHz 1 5 div from 10 MHz to TDS2024C and 200 MHz 100 MHz 2 0 div above 100 MHz to 200 MHz Ext All products 300 mV from DC to 200 mV from DC to 100 MHz 100 MHz TDS2022C 500 mV from 100 MHzto 350 mV from 100 MHz to TDS2024C 200 MHz 200 MHz Ext 5 All products 1 5 V from DC to 100 MHz 1 V from DC to 100 MHz TDS2022C 2 5 V from 100 MHz to 1 75 V from 100 MHz to TDS2024C 200 MHz 200 MHz Trigger Frequency Readout typically stabilizes at 50 more signal than generates a stable visual display 1 10 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Table 1 3 Triggering system cont Characteristic Description Sensitivity Trigger Source Sensitivity Edge Type Trigger non DC Coupled AC Same as DC Coupled limits for frequencies 50 Hz and typical above Noise Rej Effective in Sample or Average Mode gt 10 mV div to 5 Vidiv Reduces DC Coupled trigger sensitivity by 2X HF R
71. he bandwidth of the External Trigger path is not affected by the bandwidth limit Horizontal Trigger Position The trigger position is set by the Horizontal Position knob Trigger Holdoff Range 500 ns minimum to 10 s maximum The ability to set large values of Holdoff is limited by the difficulty in adjusting the Holdoff at Sec Div settings less than 100 ms Div This is because Holdoff cannot be set in 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 External Trigger Input Impedance External Trigger Maximum Input Voltage 1 M 2 in parallel with 20 pF 3 pF 300 Vays Installation Category Il derate at 20 dB decade above 100 kHz to 13 V peak AC at 3 MHz and above Based on sinusoidal or DC input signal The maximum viewable signal while DC coupled is 50 V offset 5 Vldiv at 4 divisions or 70 V AC coupling allows measuring signals on a DC level up to 300 V For nonsinusoidal waveforms peak value must be less than 450 V Excursions above 300 V should be less than 100 ms duration and the duty factor is limited to 44 RMS signal level must be limited to 300 V If these values are exceeded damage to the instrument may result Line Trigger Line Trigger mode provides a source to synchronize the trigger with the AC line input Characteristics Input Amplitude req
72. he shield will destroy the attaching gasket Removal 1 Remove the power button and rear case See page 8 11 2 Remove the internal assembly from the front case See page 6 13 Internal Assembly 3 Disconnect the backlight cable from the Display Adapter board 4 Disconnect the LCD data cable from the Display module 5 Remove the power supply module See page 6 12 Power Supply 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 Installation 1 Position the Display module on the chassis 2 Use the Torx T 8 screwdriver and install the four screws to attach the display module to the chassis Torque the nuts to 3 in lbs 0 33 N m using the torque wrench 2 864 0 26 in Ibs 3 Route the backlight cable through the opening in the internal assembly 4 Connect the backlight cable to the Display Adapter board 5 Assemble the oscilloscope by performing the installation procedure for each module that was removed TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Front Panel Module You will need a torque limiting Torx T 15 screwdriver and a flat blade screwdriver for this procedure Refer to the exploded view diagram for the 2 channel models or the 4 channel models See page 8 5 See page 8 7 Removal 1 Remove the power button and rear case See page
73. hen ordering parts it is important to include the following information in your order Part number Instrument type or model number Instrument serial number Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number Tektronix part numbers contain two digits that show the revision level of the part For some parts in this manual you will find the letters XX in place of the revision level number Part Number Revision Level Revision Level May Show as XX A ES 670 7918 03 670 7918 XX When you order parts Tektronix will provide you with the most current part for your product type serial number and modification if applicable At the time of your order Tektronix will determine the part number revision level needed for your product based on the information you provide Modules can be serviced by selecting one of the following two options Contact your local Tektronix service center or representative for repair assistance Module exchange In some cases you may exchange your module for a remanufactured module TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 8 1 Replaceable Parts These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800
74. ications Table 1 1 Signal acquisition system characteristics cont Characteristic Description Upper Frequency Limit 20 MHz Bandwidth Limited typical This is the upper frequency for Analog Bandwidth when the instrument has 20 MHz bandwidth limiting turned on 20 MHz Bandwidth of all trigger paths are similarly limited except the External Trigger which is not affected by BW Limit function Each channel is separately limited allowing different bandwidths on different channels of the same instrument Lower Frequency Limit AC Coupled This is the lower frequency for Analog Bandwidth when the instrument is AC coupled lt 10 Hz 1 Hz when 10X passive probes are used Rise Time typical Model Expected full bandwidth rise time TDS2022C TDS2024C 2 1 ns TDS2012C TDS2014C 3 5 ns TDS2002C and 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 is generally calculated from the following formula Rise time in ns 350 Bandwidth in MHz Peak Detect Mode Pulse Response This is the capability of the instrument to capture single event pulses using the Peak Detect Acquisition Mode The minimum single pulse widths for guaranteed 5096 or greater amplitude capture are as follows Vertical Position Ranges Model Sec Div Setting Minimum Pulse Width TDS1002C EDU 50 sec div to 5 uS div 12 ns TDS1012C EDU TDS2002C TDS20
75. ion Check Bandwidth This test checks the bandwidth of all input channels 1 Setup the oscilloscope using the following table Push menu button Select menu option Select setting Default Setup Channel 1 Probe 1X Acquire Average 16 Trig Menu Coupling Noise Reject Measure Source Channel under test Type Pk Pk 2 Connect the oscilloscope channel under test to the leveled sine wave generator as shown in the following figure Leveled sine wave Digitizing oscilloscope generator OQ ccccaca e 2000 0 Cogo P ad e n a 9 Output 2000 o OOj 50 Q feedthrough BNC cable terminator Set the oscilloscope Vertical Scale volts division to 500 mV div Set the oscilloscope Horizontal Scale seconds division to 10 ms div Set the leveled sine wave generator frequency to 50 kHz m UC e p Set the leveled sine wave generator output level so the peak to peak measurement is between 2 98 V and 3 02 V 7 Set the leveled sine wave generator frequency to 40 MHz if you are checking a TDS1001C 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 TDS2004B 100 MHz if you are checking a TDS1012C EDU TDS2012C or TDS2014C 200 MHz if you are checking a TDS2022C or TDS2024C 8 Set the oscilloscope Horizontal Scale seconds division to 10 ns div 9 Check that the peak to peak m
76. ktronix part numbers 174 4401 00 0 91 meters 3 feet 174 5194 00 1 83 meters 6 feet PC with USB host post and PC with USB communication port with TekVISA OpenChoice PC Communications installed Troubleshooting Tree To isolate a problem to a specific troubleshooting procedure use the troubleshooting tree that is shown on the next four pages Detailed procedures follow the tree TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 23 Maintenance Turn on power Does screen lighten See boot up screen No Put scope or frequency counter on probe comp Replace main board Front panel problems Verify LCD connector and cable values Run probe check on each channel Good voltages Replace display or display cable Probe check Ok Replace main board Connect external trigger to probe comp Set trigger source to EXT Press set 50 Figure 6 5 Oscilloscope troubleshooting tree page 1 of 4 A from Troubleshooting Tree page 3 to Troubleshooting Tree page 3 Yes Yes gt gt to Troubleshooting Tree page 2 gt to Troubleshooting Tree page 2 Replace main board Trigger indicator ON Replace main board B to Troubleshooting Tree page 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance from Troubleshooting Tree page 1 D Check cabling to
77. le m Do not slide the modules over any surface B Avoid handling modules in areas that have a floor or work surface covering capable of generating a static charge Inspection and Cleaning Inspection and cleaning are done as preventive maintenance Preventive maintenance when done regularly can prevent oscilloscope malfunction and enhance its reliability Preventive maintenance consists of visually inspecting and cleaning the oscilloscope and using general care when operating it How often you do maintenance depends on the severity of the environment in which you use the oscilloscope A good time to perform preventive maintenance is just before adjustment of the oscilloscope TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 1 Maintenance 6 2 General Care Interior Cleaning AN Exterior Cleaning AN For best performance follow these recommendations Protect the oscilloscope from adverse weather conditions The oscilloscope is not waterproof Do not store or leave the oscilloscope where the liquid crystal display LCD is exposed to direct sunlight or high humidity for long periods of time m The front and rear cases help keep dust out of the oscilloscope and must be in place during normal operation To avoid damage to the oscilloscope or probes do not expose them to any sprays liquids or solvents Use a dry low velocity stream of air to clean the interior of the chassis Use a soft bris
78. le 1 6 Data handling characteristics Characteristic Description Retention of Front Panel Settings Stored Waveforms and Multiple Front Panel Settings Front panel settings are stored periodically in memory The settings are not lost when the instrument is turned off or if there is a power failure Two Channel 1 Channel 2 or Math waveforms can be stored in nonvolatile waveform memory A or B One both or neither of A or B waveform memories can be displayed For the TDS20X4C four waveforms A B C D or Math can be stored Ten user setups of the current instrument settings can be saved and restored from nonvolatile memory Additional storage is available when an appropriate mass storage device is connected via USB Power Distribution System Table 1 7 Power distribution system Characteristic Description Power Consumption Less than 30 W at 85 to 275 Vac input Source Voltage Full Range 100 to 240 Vacrms 10 Installation Category II Covers range of 90 to 264 Vac Source Frequency 360 Hz to 440 Hz from 100 Vac to 120 Vac 45 Hz to 66 Hz from 100 Vac to 240 Vac Fuse Rating 1 Amps T rating 250 V IEC and UL approved TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Mechanical Characteristics Table 1 8 Mechanical characteristics Characteristic Description Specifications Weight Requirements that follow are nominal 2 0 kg 4 4 lbs stand alone instrument
79. le of a Vertical Position Accuracy Test Spreadsheet on page A 1 3 Connect the oscilloscope power supply and voltmeter as shown in the following figure Oscilloscope under test Power supply Voltmeter Ooocoloa o Q BEBE G olooooclo vc olo olo Negative 9 s Po CHO BNC to Dual Banana adapter Red leads Black leads TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 11 Performance Verification 4 Set the power supply to the 1 8 V value shown in column A the Approximate Test Voltage 5 Adjust the vertical position knob for the DC line to position the line in the center of the screen 6 Enter the voltage on the voltmeter and on the oscilloscope into the spreadsheet in 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 as shown in the following figure Oscilloscope under test p Power supply Voltmeter decise eS OOODGOIOO olaoo Oa Positive bia e Ooo ojo BNC to Dual Banana adapter Red leads Black leads 9 Repeat steps 4 through 6 for the values of 0
80. lloscope wave generator Output z Edge setup Four Channel Square wave Digitizing oscilloscope generator gsesda Oocncono occt 2 c O O0 0009 5 S OOD o O Output B J E 3000O0 50 Q feedthrough terminator gt Adjustment steps table lists proper channels 1 MBNC cable Figure 5 1 Adjustment setups TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 50 O feedthrough terminator Adjustment steps table lists proper channels 1 M BNC cable 5 3 Adjustment Procedures Adjustment Procedure Use this procedure to load new calibration constants 1 Um des Sis e 10 11 Enable the Service menu See page 5 2 Enable the Service Menu Push the Service option button Push the Factory Cal option button Push the Warmup Timer option button Push the Start Timer option button to allow a 10 minute warm up After 10 minutes the oscilloscope displays a large black or green cross Press the front panel Utility button and push the Service option button Push the Factory Cal option button Push the FCAL INIT option button to initiate the factory calibration routine You are now in step 1 of the procedure As indicated by step 1 connect a 0 0 Vpc source to the channel inputs See Table 5 2 Press FCAL STEP to load the calibration constant for step 1 Follow the screen prompts
81. loscope Service Manual 1 3 Specifications Table 1 1 Signal acquisition system characteristics cont Characteristic Description y Analog Bandwidth DC Coupled Sample or Average This is analog bandwidth when the instrument is DC coupled in sample or average mode V div values are accurate for probe attenuation settings of 1X No probe should be installed for these measurements System bandwidth is type tested to be equivalent to this specification with the provided probe in 10X mode Use Section 4 6 1 of IEEE 1057 with the reference frequency of 1 kHz at an amplitude of 5 divisions driven from a 50 Q source with external termination at the input BNC 25 Q effective source TDS2022C TDS2024C to 200 MHz for 5 mV div through 5 V div settings with bandwidth limit at full with temperature between 0 C and 35 C DC to gt 160 MHz for 5 mV div through 5 V div settings with bandwidth limit at full for temperatures between 0 C and 50 C 5 mV div settings are limited to 20 MHz bandwidth TDS2012C TDS2014C DC to 2 100 MHz for 5 mV div through 5 V div settings with bandwidth limit at full 5 mV div settings are limited to 20 MHz bandwidth TDS2002C TDS2004C DC to 2 70 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full 5 MV div settings are limited to 20 MHz bandwidth TDS2001C DC to 2 50 MHz for 5 mV div through 5 V div settings with the bandwidth limit at full lt 5 mV div settings
82. lts Div and Coupling settings TDS2001C on each channel TDS2002C TDS2004C Crosstalk Channel Isolation Section 4 11 1 of IEEE std 1057 It is the ratio of the level of a signal input into one channel to that of the same signal present in another channel due to stray coupling Model Crosstalk TDS2022C 2 100 1 with a 100 MHz sine wave and with equal V div settings on each TDS2024C channel TDS1012C EDU 2 100 1 with a 50 MHz sine wave and with equal V div settings on each TDS2012C channel TDS2014C TDS1002C EDU 2 100 1 with a 30 MHz sine wave and with equal V div settings on each TDS2002C channel TDS2004C TDS1001C EDU 2 100 1 with a 20 MHz sine wave and with equal V div settings on each TDS2001C channel TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Time Base System Table 1 2 Time base system Characteristic Description Sample Rate Range This is the range of real time rates expressed in samples second at which a digitizer samples signals at its inputs and stores the samples in memory to produce a record of time sequential samples IEEE 1057 2 2 1 Model Sample rate range TDS2012C 5 S s to 2000 MS s TDS2014C TDS2022C TDS2024C TDS1001C EDU TDS1002C EDU TDS1012C EDU TDS2001C TDS2002C TDS2004C 5 S s to 1000 MS s Waveform Interpolation Record Length Seconds Division Range Sin x x interpolation Waveform interpolation is activa
83. n fluctuate around 500 mV 7 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 8 Setthe leveled sine wave generator frequency to 40 MHz if you are checking a TDS1001C 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 TDS2022C or TDS2024C 9 Setthe oscilloscope Horizontal Scale seconds division to 5 ns div 10 Set the leveled sine wave generator output level to approximately 750 mV p p SO that the measured amplitude is approximately 750 mV The measured amplitude can fluctuate around 750 mV 11 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 12 For the TDS2022C and TDS2024C models set the frequency to 200 MHz and increase the amplitude to V Verify stable triggering 13 Set the oscilloscope Horizontal Scale seconds division to 2 5 ns div 14 Change the oscilloscope setup using the following table 4 8 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Performance Verification Push menu button Select menu option Select setting Trig Menu Slope Falling 15 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 16 Disconnect the test setup 17 Repeat steps through 16 for all input channels Check Exte
84. n the Display Gain Variable is used However WAVEFORM DATA obtained through the 1 0 interface is limited to the 1 2 5 gain settings Probe Scale Factors 1X 10X 20X 50X 100X 500X 1000X voltage attenuation 5 1 500 m 200 m 20 m 10 m 1 m V A current scale factor This adjusts the display scale factor of the instrument to accommodate various probe types Accuracy of the probe used must be added to the accuracy specifications of instrument No automatic probe interface is provided so you must verify that the settings match the probe characteristics The probe check function allows setting of the proper attenuation for voltage probes Acquisition Modes Sample Peak Detect Average Envelope mode not provided Retained Front Panel Settings Front panel settings are retained when the instrument power is turned off and on with the power switch The settings are retained when the line power is turned off and on The instrument periodically saves front panel settings after settings are changed There is a delay of three seconds after the last change and before the storage of the settings in memory TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Table 1 1 Signal acquisition system characteristics cont Characteristic Description Math Modes Voltage Measurement Functions All Units Channel 1 Channel 2 Channel 2 Channel 1 Channel 1 Channel 2 Channel 1
85. n was performed m The oscilloscope must be within the factory calibration interval of one year Specifications are provided in the following tables All specifications are guaranteed unless noted typical Specifications that are marked with the symbol are checked in the Performance Verification section See page 4 1 Performance Verification Signal Acquisition System Characteristics NOTE All amplitude related or modified specifications require 1X probe attenuation factors unless otherwise specified This is due to the way the displayed sensitivity works This does not affect actual methods of attachment It only alters the relationship between displayed scale factors and the specifications Table 1 1 Signal acquisition system characteristics Characteristic Description Number of Input TDS1001C EDU Two nominally identical channels sampled Channels TDS1002C EDU simultaneously TDS1012C EDU TDS2001C TDS2002C TDS2012C TDS2022C TDS2004C Four nominally identical channels sampled TDS2014C simultaneously TDS2024C Input Coupling DC AC or GND Input Impedance DC 1 MO 2 in parallel with 20 pF 3 pF Coupled TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 1 Specifications Table 1 1 Signal acquisition system characteristics cont Characteristic Description Maximum Input Voltage At the front panel connector 300 Vems Installation Category Il derate at 20 dB decade above 100 kHz t
86. nc Signal Video Sync Selection Line Line Odd Field Even Field Field PAL SECAM NTSC formats Video Trigger Formats and Field Rates Field rates 50 Hz to 60 Hz Line rates 15 kHz to 20 kHz NTSC PAL SECAM TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 11 Specifications Table 1 3 Triggering system cont Characteristic Video Trigger Sensitivity typical Description This is the minimum peak to peak video signal required for stable Video Type triggering Source Typical sensitivity Input Channels 2 divisions of composite video Ext 400 mV of composite video Ext 5 2 V of composite video Pulse Width Trigger Pulse Width lt Less than gt Greater than Equal Not equal Trigger Modes Pulse Width Falling edge for positive polarity pulse Rising edge for negative polarity pulse Trigger Edge Pulse Width Range 33 ns lt width lt 10 seconds Pulse Width 16 5 ns or 1 part per thousand whichever is larger Resolution Equal Guardband t gt 330 ns 5 guardband 5 1 16 5 ns t lt 330 ns guardband 16 5 ns 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 provide an arbitrary guardband Any measured pulse width within the guardband will qualify If you are looking for pulse width differences th
87. nces inside the oscilloscopes are very stable over time and do not require routine updates Do not perform any procedure in this section unless the oscilloscope does not meet specifications Refer to the Performance Verification section to check the oscilloscope performance to specifications Required Equipment The equipment described in the following table or a suitable equivalent is required to complete these procedures See Table 5 1 Table 5 1 Required equipment Description Minimum requirements s Example DC Voltage Source 20 V to 20 V 0 1 accuracy Wavetek 9100 Universal Calibration Leveled Sinewave Generator 5 kHz and 200 MHz 0 6 amplitude accuracy System with Oscilloscope Calibration Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option Option 5500A SC 50 Q BNC Cable BNC male to BNC male 1 m 36 in long Tektronix part number 012 0482 XX 50 Q BNC Cable seven BNC male to BNC male 25 cm 10 in long Tektronix part number 012 0208 XX 50 Q Feedthrough Termination BNC male and female connectors Tektronix part number 011 0049 XX Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number 103 0090 XX BNC T three One male and two female BNC connectors Tektronix part number 103 0030 XX Adjustment Procedure The adjustment procedure consists of 70 steps for the 2 channel oscilloscope and 106 steps for the 4 channel model Each step requi
88. ng the button Removal Firmly grasp the button with pliers and pull it straight out of the cabinet Installation Press the button onto the power button shaft until it snaps into place TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 9 Maintenance Rear Case You will need a torque limiting Torx T 15 screwdriver and pliers for this procedure Refer to the exploded view diagram See page 8 11 Removal 1 Remove the power button See page 6 9 Power Button 2 Place the oscilloscope face down on a soft surface such as an anti static mat 3 Remove the two ESD protection covers from the rear case to expose two screws 4 Remove the five screws located on the rear case Tilt the handle to gain access to the top two screws 5 Lift the rear case off of the oscilloscope Installation 1 Place the oscilloscope face down on a soft surface such as an anti static mat CAUTION Be careful not to pinch any wires or other parts between the front and rear cases 2 Place the rear case onto the assembled oscilloscope and verify that All ofthe edges align with the front case The Li ION battery is vertical in the battery location The slots align near the USB connector and near the battery CAUTION Avoid cross threading the screws that attach the rear case to the front case An easy way to avoid this is to slip the screw into the hole and using slight pressure slowly rotate the screw counte
89. nnel and 4 channel models are slightly different TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 3 1 Theory of Operation System Level Block Diagrams Two high level block diagrams are provided one for 2 channel models and one for 4 channel models See Figure 3 1 on page 3 2 See Figure 3 2 on page 3 3 Power Supply AC Line lt ACLine In Aux P m ux Power gt LI DC ail Through e D dels chassis L gg 4 A1 Main Front Panel f 1 i GND V Display Color J101 P131 1 J1 P53 4202 ac J202 Adapter Display 12 TT DCIn gt dE c L Power J204 gt Backlight J2081 J201 J201 Probe Comp anal S m 16 T Displa Signal LCD lt F gt itd 430 Display P O J2032 18 Pins J Probe Comp GND J300 9 1 J350 J902 amp PCor printer G e USB Device port J901 Your USB Flash drive USB Flash Drive port 0445 001 Figure 3 1 Module level block diagram 2 channel 3 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Power Supply AC Line 3 amp ACLine In Through e SNP chassis Front Panel D P O J2031 Probe Comp Signa lt m P O J2032 Probe Comp GND E eH Ge us e l CH2 C s e v USB CH3 C e sem e V CH4 C e s50 e EXT Ed rig T Jenn e J1201 You
90. o 13 V peak AC at 3 MHz and above Based on sinusoidal or DC input signal The maximum viewable signal while DC coupled is 50 V offset 5 V div at 4 divisions or 70 V AC coupling allows measuring signals on a DC level up to 300 V For nonsinusoidal waveforms peak value must be less than 450 V Excursions above 300 V should be less than 100 ms in duration and the duty factor is limited to 44 The RMS signal level must be limited to 300 V If these values are exceeded damage to the instrument may result Number of Digitized Bits 8 bits except at 2 mV div Displayed vertically with 25 digitization levels per division 10 divisions dynamic range 2 mV div setting is generated by digital multiplication and the resolution is reduced Given 100 levels available the resolution is 76 5 bits Sensitivity Range Display Gain Variable 2 mV div to 5 V div in 1 2 5 sequence with the probe attenuation set to 1X The Display Gain Variable function allows the user to vary the vertical display gain continuously over the full range Resolution is that of the coarse gain from which these data are 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 data to obtain the settings between the 1 2 5 gain settings Hard copy outputs to printer will be exactly the same as seen on screen even whe
91. o Main board failure or power supply failure Table 6 4 Probe Comp output Signal at Probe Comp Possible problem 1 kHz signal no display Refer to Troubleshooting the Display See page 6 30 Troubleshooting the Display Non 1 kHz signal Refer to Troubleshooting the Main Board See page 6 37 Troubleshooting the Main Board No signal Refer to Troubleshooting the Power Supply See page 6 29 Troubleshooting the Power Supply TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Troubleshooting the Power To troubleshoot the power supply follow these steps Supply 4 2 Remove the rear case See page 6 10 Rear Case Use the test oscilloscope to measure the voltages from the power supply module at J101 on the Main board module The following table lists the voltages you should expect to see Table 6 5 Troubleshooting the power supply Maximum J101 power J101 return Derived Supply Voltage range current draw pins pins supplies 35 V 30 Voc to 40 Voc floating 15 mA 1 2 28 V LCD Pin 2 connected to 3 3 V on the Main board 6 V 5 5 V to 6 5 V 1 0A 4 3 5 8 10 5V 3 3V 30V103 6 V 1 8A 6 7 3 5 8 10 3 3 V 425 V Requires minimum load to maintain regulation 4 V 5 0 V to 3 5 V 0 8 A 9 3 5 8 10 2 5 V Line 2 V to 6 V open circuit 1 mA 11 3 5 8 10 Line trigger trigger 1 diode drop when attached to the Main board 1 With 3 W minimum load s
92. o the chassis with a cable tie as shown in the figure See Figure 6 4 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 15 Maintenance 6 Connect the LCD data cable to the Display Adapter board See Figure 6 3 7 Twist the LCD backlight cable 5 revolutions and connect the cable to the Display Adapter board at J204 8 Twist the Display Adapter power cable four revolutions and connect the cable to the Display Adapter board at J202 9 Assemble the oscilloscope by performing the installation procedure for each module that was removed 6 16 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Front Panel Cable You will need a torque limiting Torx T 15 screwdriver and pliers for this procedure Refer to the exploded view diagram See page 8 9 Removal 1 Remove the front panel knobs See page 8 5 See page 8 7 2 Remove the power button and rear case See page 6 10 Rear Case 3 Remove the internal assembly See page 6 13 Internal Assembly 4 Remove the four screws attaching the front panel board to the chassis 5 Open the clamp to release the front panel cable 6 Disconnect the front panel cable at J202 on the Main board by pulling straight up from the connector 7 Disconnect the front panel cable at J1 on the Front Panel module Installation 1 Connect the front panel cable to the Front Panel module at J1 through the appropriate slot on the chassis 2 Twi
93. 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 7 1 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 7 1 Diagrams The shaded area in the figure represents modules and circuits used only in 4 channel oscilloscopes Power supply Display Display Adapter board 3 CH 1 Amplifier ASIC A USB interface Main Board Power Amplifier ASIC B Amplifier ASIC B Microprocessor Becomes part of chain A on 2 Note Shaded area is only present in channel 4 channel models 0446 003 Figure 7 1 TDS2000C and TDS1000C EDU series block diagram 7 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Replaceable Parts Replaceable Parts This chapter contains a list of the replaceable modules for the TDS2000C and TDS1000C EDU oscilloscopes Use this list to identify and order replacement parts Parts Ordering Information Part Number Revision Level Module Servicing Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements Therefore w
94. on and gently rub the display surface Avoid using excess force or you may damage the plastic display surface Exterior Inspection Inspect the outside of the oscilloscope for damage wear and missing part See Table 6 1 Immediately repair defects that could cause personal injury or lead to further damage to the oscilloscope Table 6 1 External inspection checklist Item Inspect for Repair action Front and rear case Cracks scratches deformations damaged Repair or replace defective module hardware Front panel knobs Missing damaged or loose knobs Repair or replace missing or defective knobs Connectors Broken shells cracked insulation and Repair or replace defective modules Clear deformed contacts Dirt in connectors or wash out dirt Carrying handle and cabinet feet Correct operation Repair or replace defective module Accessories Missing items or parts of items bent pins Repair or replace damaged or missing broken or frayed cables and damaged items frayed cables and defective modules connectors Interior Inspection To access the inside of the oscilloscope for inspection and cleaning refer to the Removal Procedures in this section Inspect the internal portions of the oscilloscope for damage and wear See Table 6 2 Repair any defects immediately If any circuit board is repaired or replaced check the table to see if it is necessary to adjust the oscilloscope See Table 6 2 CAUTION To
95. ope will automatically 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 toggling the Run stop choice Waveforms Lets you set the numbers of waveforms to test before stopping limit testing Violations Lets you set the numbers of violations to detect before stopping limit testing Elapsed time Lets you set the elapsed test time in seconds to pass before stopping limit testing TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 17 Specifications 1 18 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Where to Find Operating Information Where to Find Operating Information For information on installing and operating 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 com manuals TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 2 1 Where to Find Operating Information 2 2 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Theory of Operation Theory of Operation This section covers the electrical operation of the TDS2000C 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 cha
96. r Frequency Counter This provides a highly accurate means of identifying the frequency of trigger signals Since averaging takes place over a longer time span the number of stable digits is improved over the automatic measurement of the same type TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Specifications Table 1 3 Triggering system cont Frequency Counter Resolution 6 digits Frequency Counter Accuracy typical 51 ppm including all reference errors and 1 count errors Frequency Counter Frequency Range typical AC coupled 10 Hz minimum to rated bandwidth Frequency Counter Signal Source Pulse width or edge selected trigger source Frequency counter measures selected trigger source at all times in pulse width and edge mode including when oscilloscope acquisition is halted due to changes in run status or acquisition of a single shot event has completed Frequency counter does NOT measure pulses that do not qualify as legitimate trigger events Pulse Width mode Counts pulses of sufficient magnitude inside the 250 ms measurement window that qualify as triggerable events for example all narrow pulses in a PWM pulse train if set to lt mode and the limit is set to a relatively small number Edge Trigger mode Counts all pulses of sufficient magnitude Display Specifications Table 1 4 Display specifications Characteristic Description Display Typ
97. r USB Flash drive gt USB Flash Drive port Aux Power DC Out amp Line Trigger Display J202 Adapter e Power J204 J201 J201 33 m 16 md Display LoD gt r ug EO 18 Pins E m J1202 lt lt PC or printer Device port 0446 012 Figure 3 2 Module level block diagram 4 channel TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Theory of Operation Color Display Backlight Display data 3 3 Theory of Operation Main Board Acquisition System 3 4 The Main board is also called the acquisition board The Main board of the 4 channel oscilloscopes is essentially two 2 channel oscilloscopes tied together through a common microprocessor and some special interconnects to support combining the display and trigger systems The focus of the Main board discussion is the 2 channel system with differences for the 4 channel models noted as necessary At a minimum the Main board contains attenuators an amplifier ASIC a digitizer trigger system ASIC a signal processing display system services ASIC RAM flash PROM a system microprocessor USB controller USB RAM system communication RAM and special power supplies For a 4 channel oscilloscope the attenuators are duplicated Most of the other aspects of the circuitry remain unchanged Signals from the channel 1 and channel 2 and other inpu
98. rclockwise until you feel the screw slip into the screw threads Then tighten the screw clockwise A properly started screw will exhibit very little resistance going in Install the five screws in the rear case Tilt the handle to access the top two holes Install the two ESD protection covers Install the power button See page 6 9 Power Button TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance Front Feet You will need a torque limiting Torx T 15 screwdriver and pliers for this procedure Refer to the exploded view diagram for the 2 channel models or the 4 channel models See page 8 5 See page 8 7 Removal 1 Remove the power button and rear case See page 6 10 Rear 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 inserted by carefully pinching them and pushing them into their slots For example you may need to do this if the rear case has been removed and a foot has been rubbed off and unnoticed until the case is being assembled TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 11 Maintenance Power Supply Module Use a torque limiting Torx T 15 screwdriver and pliers for this procedure Refer to the exploded view diagram See page 8 9 Removal 1 Remove the power button and rear case See page 6 10 Rear Cas
99. re checking a TDS1001C 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 TDS2022C or TDS2024C 8 Setthe oscilloscope Horizontal Scale seconds division to 5 ns div 9 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 10 For TDS2022C and TDS2024C models set the sine wave generator output level for a channel 1 display to approximately 350 mV 11 For TDS2022C and TDS2024C models set the sine wave generator frequency to 200 MHz 12 Set the oscilloscope 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 Push menu button Select menu option Select setting Trig Menu Slope Falling 15 Push Set To 50 Adjust Trigger Level as necessary and then check that triggering is stable 16 Disconnect the test setup Check Vertical Position The results of this test and the DC Gain Accuracy test together define the DC Accuracy Measurement Accuracy of the oscilloscope The DC Measurement Accuracy specification encompasses two different ranges of operation over two different attenuator settings m DC Gain Accuracy Identifies errors mostly from the A D converter when the verti
100. res an external voltage source for new calibration constants Before performing the adjustment procedure warm up the oscilloscope for at least ten minutes in an ambient temperature between 20 C and 30 C Adjustments performed before warm up or outside this temperature range may result in poor performance TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 5 1 Adjustment Procedures Enable the Service Menu 5 2 If all steps in the procedure are completed successfully a Pass message is displayed and the new calibration constants take effect If any step fails the procedure is aborted and the current calibration is not affected You can choose to abort the procedure at any step without affecting the current calibration by selecting FCAL ABORT NOTE While performing the adjustment procedure keep in mind that some of the steps take a significant amount of time up to 5 minutes to complete Equipment setups are shown in the following figure See Figure 5 1 on page 5 3 Signal requirements for each step are shown in the following table See Table 5 2 on page 5 5 Before performing the adjustment procedure enable the Service menu as follows Power on the oscilloscope Push the front panel Measure button to access the Measure menu Push the top option button to access the Measure 1 menu Push and hold the front panel Single button Push and hold the front panel AutoSet button Wait at least two seconds
101. rnal Edge This test checks the edge trigger sensitivity for the external trigger Trigger Sensitivity 1 Set up the oscilloscope using the following table Push menu button Select menu option Select setting Default Setup Channel 1 Probe 1X Trig Menu Source Ext Mode Normal Acquire Sample Measure Source CH1 Type Pk Pk 2 Connect the oscilloscope to the leveled sine wave generator as shown in the following figure using channel 1 and Ext Trig Leveled sine Digitizing oscilloscope wave generator Ooooooag 20 0 T EXT TRIG O Output 20 Os v s 500 Power divider Male SMA to feedthrough Tu female BNC f terminator 7 3 Pieces SMA female to female 3 Setthe oscilloscope Vertical Scale volts division to 100 mV div 4 Setthe oscilloscope Horizontal Scale seconds division to 25 ns div 5 Setthe leveled sine wave generator frequency to 10 MHz 6 Set the sine wave generator output level to approximately 300 mV into the power splitter This is about 200 mV on channel 1 of the oscilloscope TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 4 9 Performance Verification The Ext Trig input will also be receiving approximately 200 mV Small deviations from the nominal 200 mV p oscilloscope display are acceptable 7 Setthe leveled sine wave generator frequency to 40 MHz if you a
102. robe the display cable connector at J201 on the Main board The following table describes the signals you should expect to see See the exploded diagrams in Replaceable Parts for the location and orientation of the connector on the Main board Table 6 6 Troubleshooting the display Signal at J201 Description Color Pin 1 marked with lt No fixed pattern Depends on display data Pin 2 No fixed pattern Depends on display data Pin 3 No fixed pattern Depends on display data Pin 4 No fixed pattern Depends on display data Pin 5 No fixed pattern Depends on display data Pin 6 No fixed pattern Depends on display data Pin 7 No fixed pattern Depends on display data Pin 8 No fixed pattern Depends on display data Pin 9 26 5 Voc 1 Pin 10 Ground Pin 11 3 3 Voc Pin 12 HI when display active Pin 13 Data rate clock 1 36 MHz Square wave Pin 14 Line rate clock 11 4 kHz 500 ns high pulse from low baseline Pin 15 Frame rate clock 43 Hz 350 ns high pulse from low baseline Pin 16 Floating Pin 17 Ground Pin 18 Ground 1 Value varies with temperature contrast setting and display type 5 If all the signals are present the display module is probably defective Replace it TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance 6 If all or some of the signals are missing turn off the oscilloscope and disconnect the display cable
103. shooting tree page 4 of 4 ssssssssssssssseeeee 6 27 Measuring the backlight voltage esses emen 6 33 TDS2000C and TDS1000C EDU series block diagram sessessesseseesee 7 2 Exploded diagram 2 channel models sess 8 5 Exploded diagram 4 channel models sess 8 7 Power supply module cables and wires 2 ch model shown with 4 ch model in circle 8 9 Exploded diagram back case and trim 0 cece cee cece cece eee eee eee e ene enaeeneenaes 8 11 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Table of Contents List of Tables Table 1 1 Signal acquisition system characteristics 0 0 2 0 cccce cece eee e ence eee eee e eee e 1 1 Table 1 2 Time base system e cece ence eee e eee eee ee me ehe eese e e he se s se e ne nnn 1 7 Table 1 3 Triggering system ic ceesieoee eerta ee a I Qr ra da dx Contre d E 1 9 Table 1 4 Display specifications sess me m eene eene 1 13 Table 1 5 Interfaces and output ports specifications ce ccc ece cece eee e ence eee eee eee eeaeennees 1 14 Table 1 6 Data handling characteristics csse 1 14 Table 1 7 Power distribution system 0 0 cece cece cece eee ene e eme e eene 1 14 Table 1 8 Mechanical characteristics sss me me meme seen 1 15 Table 1 9 Environmental performance ssssssssssssssssssssee eee me e ee ees 1 15 Table 1 10 D
104. ssrsrrsrn gt 4 3 Self Test e 4 3 Self Calibration iere Sac et ERa A E oud rh e ata OE UN suntv caeaseadeles 4 3 Check DC Gain ACCUEFaCy iiec eere ee vera ere ee HS EU ened LS EROR ve ae Ie sees 4 3 Check Bandwidth iiL eT E EFDU LA E HUE TE M UNES TI ION 4 5 Check Sample Rate Accuracy and Delay Time Accuracy sss 4 6 Check Edge Trigger Sensitivity esses eme mene 4 7 Check External Edge Trigger Sensitivity esses 4 9 Check Vertical Position Accuracy csssssssssssssssssessseee eese se eee he eese 4 10 Adjustment Procedures ii Adj stment Procedures cuore esr ere tot Reni e ee I e ea tu a eue ET i te tede Phe 5 1 Required niii is c acceisaidadddiwancssdndanndeaan dud lannnnesdha biaatidediaiaadacntebhaamiddudnbecs 5 1 Adjustment Proced te oreet a e eaae E UE DO Re IR e ARaa E E ER E D NN RU IE ERA 5 1 Enable the Service Men ciet ex bete e ette pe LER dew vena tone dg nd e d eA ad da 5 2 Adjustment Procedure iss oor reete iE opea E tee T I eria T ope U a d eens 5 4 Maintenan Ge D 6 1 Preventing ESD 2 etes de ro se E vets THREE p EE EVER Pao STRIS e A Ead VER ERE do lien 6 1 Inspection and Cleaning ee teure tete etri RR re eH E ue UE ER ipea e Qu dene Edd 6 1 SUERTE 6 2 Interior Cleaning teas da eser ee E De e Ex RR IQU E dax NO ERa REO CEN eris 6 2 Exterior Cleaning cesec peccet ree ta Seb ert
105. st the cable to keep it from contacting the boards and chassis and attach it using the cable tie NOTE Wind up the front panel cable until it is tight loops are okay This keeps the cable bundle together Connect the front panel cable at J202 on the Main board by pushing the cable straight down into the connector Install the four screws to attach the front panel module to the chassis Assemble the oscilloscope by performing the installation procedure for each module that was removed TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 17 Maintenance Main Board Module You will need a torque limiting Torx T 15 long shank screwdriver a torque wrench and a 5 8 inch deep socket for this procedure Refer to the exploded view diagram See page 8 9 CAUTION The Main board module is particularly sensitive to ESD Read the Preventing ESD section before removing or installing the Main board See page 6 1 Preventing ESD Removal 1 Remove the power button and rear case See page 6 10 Rear Case Remove the internal assembly from the front case See page 6 13 Internal Assembly 2 Disconnect the following wires from the Main board by pulling straight up from the connector The power supply cable at J101 Press down on the latch while pulling up on the cable The display cable at J201 The front panel cable at J202 3 Use the screwdriver to remove the three screws that attach the Main
106. t connectors pass through attenuators and an AC coupling switch to the amplifier ASIC The Ext Trig input has an abbreviated version of this path lacking some of the attenuator settings and the AC coupling switch The amplifier ASIC contains buffers and variable gain amplifiers as well as filters that provide 20 MHz bandwidth limiting The task of the amplifier ASIC is to convert from a 1 MQ single ended environment in the front end to a much lower impedance differential and thus less noise sensitive environment for the acquisition process The amplifier ASIC assures that the input signal is amplified to a level that will allow the fullest possible use of the digitizer The acquisition ASIC contains samplers and peak detectors for each input channel a common amplifier an A D converter and the trigger logic The digitized waveform samples are transferred to the processing and display ASIC In 4 channel systems the two acquisition ASICs are interconnected so that a trigger on one ASIC can cause a trigger on the other The processor system adds the microprocessor and flash PROM to the processing and display system The processor system interprets the front panel control changes detected by the display ASIC provides control parameters based on user setting requests computes waveform measurements and manages the USB interfaces via the dedicated USB controller Saved setups waveforms and calibration constants are stored in nonvolatile memory s
107. t you enter You can now use the spreadsheet to enter values for the vertical position accuracy test Sample Filled In Vertical Position Accuracy Test Spreadsheet Table A 1 Vertical position accuracy test spreadsheet A B C D E F G H I 1 Approximate DVM Oscilloscope Error Lower Upper Margin Test Measured Measured Limit Limit Voltage Voltage Voltage 2 2 00 0 000 t t t Volts div 0 05 3 1 96 0 000 i i 1 4 1 92 0 000 t t t Offset 0 1 as a fractional division 5 1 88 0 000 i t t Offset in 0 005 volts TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual A 1 Appendix A Example of a Vertical Position Accuracy Test Spreadsheet Table A 1 Vertical position accuracy test spreadsheet cont A B C D E F G H I 6 1 84 0 000 t t 1 Total 0 01 12 14 15 voltage offset 7 1 80 1 80 1 79 0 010 0 028 0 028 0 018 8 1 76 1 76 1 75 0 010 0 0276 0 0276 0 018 Gain 1 error 9 1 72 1 72 1 72 0 000 0 0272 0 0272 0 027 10 1 68 1 68 1 68 0 000 0 0268 0 0268 0 027 Equation B7 C7 for cell D7 11 1 64 1 64 1 64 0 000 0 0264 0 0264 0 026 Equation F7 for cell E7 12 1 60 1 6 1 6 0 000 0 026 0 026 0 026 Equation ABS B7 1 8 for cell E 1 6 13 1 56 1 56 1 56 0 000 0 0256 0 0256 0 026 14 1 52 1 52 1 52 0 000 0 0252 0 0252 0 025 Equation MIN for cell D7 E7 F7 D7 G7 15 1 48 1 48 1 49 0 010 0 0248 0 0248 0 015 16 1 44 1 44 1 45 0 010
108. ted for sweep speeds of 100 ns div and faster This is the total number of samples contained in a single acquired waveform record Memory Length in IEEE 1057 2 2 1 2 500 samples per record 5 ns div to 50 s div in 1 2 5 5 sequence Sec Div Variable function is not available for this product Y Long Term Sample Rate and Horizontal Position Time Accuracy Horizontal Position Time Range This is the maximum total long term error in sample rate or horizontal position time accuracy expressed in parts per million 50 ppm over any 21 ms interval Horizontal scale setting 5 ns div to 10 ns div 25 ns div to 100 us div 250 ys div to 10 s div 4 div s div to 50 s 25 s div to 50 s div 4 div s div to 250 s The user controls the time from the trigger to the center graticule on the display with the Horizontal Position knob The resolution of the Horizontal Position time is 1 25 of a horizontal division Horizontal position time range 4 div s div to 20 ms 4 div s div to 50 ms Horizontal Window Display The Window Zone enables a user to select a part of the display to be magnified The user controls the location with the Horizontal Position knob and the width with the Sec Div knob Vertical cursors show the selected zone To magnify the zone the user selects the window from the menu TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 7 Specifications Table 1 2 Time base syst
109. test before connecting the probe input Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument Ground the product This product is grounded through the grounding conductor of the power cord To avoid electric shock the 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 ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Connect the probe reference lead to earth ground only Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Power disconnect The power switch disconnects the product from the power source See instructions for the location Do not block the power switch it must remain accessible to the user at all times Do not operate without covers Do not operate this product with covers or panels removed Do not operate with suspected failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid exposed circuitry Do not touch exposed connections and components when power is present TDS2000C and TDS1000C EDU Series Oscilloscope Service
110. till functions with no load 3 If all of the voltages are present the Main board is probably defective Replace it If all or some of the voltages are missing turn off the oscilloscope and disconnect the cable at connector J101 on the Main board module Turn on the oscilloscope and check the voltages at the loose end of the cable disconnected from J101 checking for the same voltages as in step 2 If all of the voltages are missing check the line fuse on the power supply module If the fuse is defective replace the power supply module If the fuse is okay and all or some of the voltages are missing the power supply module is probably defective Replace it TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 29 Maintenance Troubleshooting the Display To troubleshoot a nonfunctional display follow these steps 1 Remove the rear case See page 6 10 Rear Case 2 Turn on the oscilloscope and verify that the display lights up If it does not either the display or power supply is defective If this procedure is not conclusive continue with Troubleshooting the Power Supply See page 6 29 Troubleshooting the Power Supply NOTE Without a functional display module the simplest way to verify that the oscilloscope is on and functioning is to check for a signal at the output The Probe Comp output generates approximately a 5 V 1 kHz square wave 3 Use the test oscilloscope and the TPP0201 probe to p
111. tle non static producing brush for cleaning around components If you must use a liquid for minor interior cleaning use a 75 isopropyl alcohol solution and rinse with deionized water WARNING To avoid injury power off the instrument and disconnect it from line voltage before performing any procedure that follows CAUTION Avoid the use of chemical cleaning agents which might damage the plastics used in this oscilloscope Use only deionized water when cleaning the menu buttons or front panel buttons Use a 75 isopropyl alcohol solution as a cleaner and rinse with deionized water Before using any other type of cleaner consult your Tektronix Service Center or representative Clean the exterior surfaces of the chassis with a dry lint free cloth or a soft bristle brush If any dirt remains use a cloth or swab dipped in a 75 isopropyl alcohol solution Use a swab to clean narrow spaces around controls and connectors Do not use abrasive compounds on any part of the chassis that may damage the chassis CAUTION To prevent getting moisture inside the oscilloscope during external cleaning use only enough liquid to dampen the cloth or applicator Clean the On Standby switch using a dampened cleaning towel Do not spray or wet the switch directly TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance If the display is very dirty moisten the wipe with distilled water or a 75 isopropyl alcohol soluti
112. tor is useful for cleaning in narrow spaces and on circuit boards STOP If after performing steps 1 and 2 a module is clean on inspection skip steps 3 4 and 5 Proceed with step 6 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Maintenance 3 Ifsteps 1 and 2 do not remove all the dust or dirt all modules in the oscilloscope except the Display Module and Front Panel Module may be spray washed using a solution of 75 isopropyl alcohol During cleaning of the Acquisition board Main board make sure that no residue is left in the attenuators Debris or residue can cause several problems with signal fidelity that cannot be corrected by calibration When handling the board avoid handling the attenuators since skin oils may cause problems 7 Extensive cleaning of the Display Module is difficult because water must not be trapped between the display shield and the display The polarizers integrated into the display degrade with long term exposure to water The display shield and display must be replaced as an assembly if significant moisture or debris become trapped inside Cotton tipped applicators and lint free rags moistened in isopropyl alcohol and or deionized water offer the best cleaning with the least opportunity for damage to the assembly The Front Panel module can be damaged by deposition of film or debris inside the knob encoders To avoid this be careful not to drip liquid or blow debris into the encoders
113. ts If cleaning does not solve the problem the switch keypad front panel board or Main board may be defective Follow the remaining steps in this procedure to isolate the problem 8 Replace the switch keypad and retest the buttons If the problem persists go to step 9 9 Usethe test oscilloscope and 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 6 10 Expected signals at J202 Signal at J202 Description 1 FPLED P LED latch line 6 44 kHz High with 120 ns low pulses Location of pulse relative to FPCLR 12 P determines which lights are lit 2 FPCLR 12 P Clear Front Panel Scan line A 6 44 kHz Low pulsing high with 50 ns pulses Determines beginning of a scan sequence for first half of front panel 3 FPCLK 12 P Front Panel Clock line A 405 kHz High with 50 ns pulses going low Each clock after FPCLR 12 P increments the scan location by one 4 FPDATA12P Front Panel Scan Data line A No fixed pattern Stable when triggered from FPCLR 12 P Pattern depends on rotation of knobs being scanned 5 GND 0 V ground 6 FPTHERMSTR P Front Panel Temp Sense About 2 Vpc depending on temperature contrast setting and display type 7 FP PWR 5 0 Voc 8 FPTHERMGND_P Temp Sense Return Ground 9 GND 0 V ground TDS2000C and TDS1000C E
114. uirements 85 Vac 265 Vac Input Frequency requirements 45 Hz 440 Hz Edge Trigger Trigger Modes Auto Normal TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 1 9 Specifications Table 1 3 Triggering system cont Characteristic Description Trigger Coupling AC DC Noise Reject High Frequency Reject Low Frequency Reject The External Trigger path does not have a DC blocking capacitor ahead of the trigger input circuit The rolloff associated with AC coupling happens after the input circuit When attempting to trigger on an AC signal that has a DC offset care must be used to avoid overloading the input of the External Trigger circuit For signals that have a large DC offset using Channel 1 or Channel 2 and Channel 3 or Channel 4 for the TDS20X4B with AC coupling is preferred Trigger Slope Rising Edge Falling Edge Y Sensitivity Measurement Style A The minimum signal levels for achieving stable frequency indication on the Trigger Edge Type Trigger Frequency Counter within 1 of correct indication DC Coupled Measurement Style B Section 4 10 2 in IEEE Std 1057 The minimum signal levels required for stable edge triggering of an acquisition when the trigger Source is DC coupled Trigger Source Sensitivity Measurement X Sensitivity Measurement style A typical style B Channel Inputs All products 1 5 div from DC to 1 div from DC to 10 MHz gt 10 MHz
115. w diagram See page 8 11 Removal 1 Remove the front panel knobs See page 6 9 Front Panel Knobs 2 Remove the power button and rear case See page 6 10 Rear Case 3 Remove the five screws attaching the internal assembly to the front case 4 Lift the entire internal assembly 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 the internal assembly Installation 1 Install the switch keypad mat in the front case if it was removed 2 Place the internal assembly in the front case 3 Install the five screws to attach the internal assembly to the front case 4 Assemble the oscilloscope by performing the installation procedure for each module that was removed TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 13 Maintenance Display Adapter Module You will need a torque limiting Torx T 15 screwdriver and pliers for this procedure Refer to the exploded view diagram See page 8 9 Removal 1 Remove the power button and rear case See page 6 10 Rear Case 2 Disconnect the Display cable from J201 on the Main board by pulling straight up from the connector Remove the cable tie to release the cable See Figure 6 3 Main board assembly J202 er Pla To Jt on the y Front Panel module Display cable Display Adapter
116. y cable J101 J202 Display Adapter board J204 J201 LCD backlight LCD data Able cable N AC ground lug Power supply module 0446 007 Figure 6 9 Measuring the backlight voltage TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 6 33 Maintenance Troubleshooting the Front Panel To troubleshoot an improperly functioning front panel follow these steps 1 To execute the internal diagnostic tests remove all input signals from the oscilloscope and enable the Service menu See page 5 2 Enable the Service Menu 2 Push the UTILITY button and push the Service option button The following options appear Table 6 7 Troubleshooting the front panel service Menu Comments Factory Cal Steps through the calibration routine steps Total Init Writes factory default settings to all saved setups writes factory default data to all reference waveforms turns off Service Mode and performs the same actions as the front panel Default Setup button Service Diag Displays the service diagnostics menus Service Mode Off Disables the Service menu 3 Select Service Diag The following options appear Table 6 8 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 Diag Opens a menu that enables you to rerun a subset of the power on self tests P
117. z 2 5 V 4T Sinewave Generator 50 Q 1 MHz 2 5 Vp p 48 Sinewave Generator 50 Q 50 kHz 2 5 Vp p 49 Sinewave Generator 50 Q 20 MHz 2 5 V 50 Sinewave Generator 50 Q BWL 2 5 Vo 51 Sinewave Generator 50 Q BWL 5 Vp p 52 Sinewave Generator 50 Q BWL 1 6 Vp p Edge 53 Edge 50 Q 1 kHz 0 to 800 mV Ch 2 Sinewave 54 Sinewave Generator 50 Q 5 kHz 1 Vp p generator 55 Sinewave Generator 50 Q 1 MHz 100 mV 56 Sinewave Generator 50 Q 1 MHz 1 V 57 Sinewave Generator 50 Q 50 kHz 1 Vp p 58 Sinewave Generator 50 Q 20 MHz 1 Vp 59 Sinewave Generator 50 Q BWL 25 mV 60 Sinewave Generator 50 Q BWL 50 mV 61 Sinewave Generator 50 Q BWL 100 mV p 62 Sinewave Generator 50 Q BWL 250 mV gt 63 Sinewave Generator 50 Q BWL 500 mV p 64 Sinewave Generator 50 Q BWL 1 Vp p 65 Sinewave Generator 50 Q 5 kHz 2 5 Vo 66 Sinewave Generator 50 Q 1 MHz 2 5 Vp p 67 Sinewave Generator 50 Q 50 kHz 2 5 Vp p 68 Sinewave Generator 50 Q 20 MHz 2 5 V 69 Sinewave Generator 50 Q BWL 2 5 Vo 70 Sinewave Generator 50 Q BWL 5 Vp p 5 6 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual Table 5 2 Adjustment steps cont Adjustment Procedures Input Setup diagram Step number Signal Signal source setting Ch 3 Sinewave 71 Sinewave Generator 50 Q 5 kHz 1 Vp p rer models generator 72 Sinewave Generator 50 Q 1 MHz 100 mV

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