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THS710A, THS720A, THS730A & THS720P TekScope™ Service

1. You may need to press Select Page to display this selection 3 Connect the TekScope instrument to the DC voltage source as shown below DC voltage Source Dual banana to bnc adapter BNC cable THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 4 For each VOLTS DIV setting listed below perform the following steps a Setthe DC voltage source output level to the positive voltage listed and then record the mean measurement as Vpo b Reverse the polarity of the DC voltage source and then record the mean measurement as c Calculate Vpos Wneg and then compare to the accuracy limits in the table DC Voltage Source Output VOLTS DIV Setting Levels 5 mV div 17 5 mV 17 5 mV 500 mV div 1 75 V 1 75 V 2 Vidiv 7 00 V 7 00 V 10 V div 35 0 V 35 0 V 5 Set DC voltage source output level to 0 V Accuracy Limits for V diff 34 05 mV to 35 95 mV 3 405 V to 3 595 V 13 62 V to 14 38 V 68 1 Vto 71 9 V 6 To check channel 2 repeat step 2 substituting CH 2 for CH 1 7 Press CH 1 and WAVEFORM OFF to remove the channel 1 waveform from the display 8 Repeat steps 3 through 5 substituting CH 2 for CH 1 to complete the check of channel 2 THS710A THS720A THS730A amp THS720P Service Manual 33 Performance Verification Check Oscilloscope This test checks the bandwidth of channel 1 Channel 1 Ba
2. B anana cables Resistance standard Banana cables yg Figure 9 Meter adjustment setups THS710A THS720A THS730A amp THS720P Service Manual 59 Adjustment Procedures Meter Adjustment Procedure Completing the Adjustment Process 60 After removing the adjustment lockout jumper use this procedure to adjust the meter voltage references 1 Turn on the TekScope instrument and let it warm up for at least ten minutes 2 Connect the DC voltage source to the instrument as shown in the DC voltage setup of Figure 9 3 Set the DC voltage source amplitude to 400 mV 4 Use the TekScope instrument setup below to start the meter adjustment process For each step follow the specific instructions displayed by the instrument to connect the correct signal source and confirm that you are ready to proceed to the next step METER METER UTILITY System Factory DMM OK Factory Cal DMM 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 After adjusting the meter continue with one of the following steps m Return to Oscilloscope Adjustment on page 55 to adjust the oscilloscope voltage references
3. Install foam pad Install I O port hole plug re Install foam pad Ov Install foam pads Figure 22 Foam pad and hole plug locations on the back cover c Place the back cover on a soft surface with the BNC connector openings facing away from you d Dress the battery wires to the left side of the back cover to provide clearance for the chassis e While inserting the BNC connectors into their openings lower the chassis into the back cover f Reconnect the battery wire connector and press it onto its retaining pins Check that the polarity of the connector is correct Dress the wires into the channel on the chassis as shown in Figure 23 3 Install the switch mat and front cover using the procedure on page 74 THS710A THS720A THS730A amp THS720P Service Manual 83 Maintenance 84 Retain connectors between pins i Z 222 Locate ferrite bead in cavity ae Dress wires from battery pack through slots Figure 23 Routing the battery wires THS710A THS720A THS730A amp THS720P Service Manual Maintenance Complete Disassembly You will need 1 inch flat bladed screwdriver and needle nose pliers to remove modules mounted to the the chassis Remova
4. THS710A THS720A THS730A amp THS720P Service Manual REE SENIUM Specifications This chapter contains the oscilloscope DMM and general specifications for the THS710A THS720A THS730A and THS720P TekScope instruments All specifications are guaranteed unless noted typical Typical specifications are provided for your convenience but are not guaranteed Specifications that are marked with the symbol are checked in the chapter Performance Verification All specifications apply to all four instruments unless noted otherwise All specifications assume horizontal MAG is off unless noted otherwise To meet specifications two conditions must first be met m The TekScope instrument must have been operating continuously for ten minutes within the operating temperature range specified W You must perform the Compensate Signal Path operation accessible through the utility menu if the ambient temperature changes by more than 5 C Table 1 Oscilloscope specifications Acquisition Acquisition Modes Acquisition Rate typical Single Sequence Inputs Input Coupling Input Impedance DC Coupled Maximum Voltage Between Signal and Common at Input BNC Sample Normal Peak detect Envelope and Average Up to 25 waveforms per second 2 channels sample acquisition mode MAG on no measurements Acquisition Mode Sample Peak Detect Acquisition Stops After Single acquisition one or two channels simultaneousl
5. Display cable connector Inverter board Spring Switch flex circuit board Figure 18 Removing the display module c Using the 4 inch flat bladed screwdriver carefully open the display cable connector as shown in Figure 19 d When the connector is open slip the display cable out of the connector to free the display module THS710A THS720A THS730A amp THS720P Service Manual 79 Maintenance 80 Figure 19 Opening the display cable connector Installation Use this procedure to install the display module and inverter board 1 Open the display cable connector on the back of the display module 2 Hold the display module upright as shown in Figure 18 3 Insert the display cable into its connector and then use the J4 inch flat bladed screwdriver to close the connector Check that the display cable is fully inserted into the connector 4 Fold the display module back into the chassis and seat it between the foam pads 5 Plug the cable from the display module into the inverter board and then route the cable in the channels as shown in Figure 20 6 Place the inverter board into its cavity over the guideposts in the chassis 7 Reconnect the connector to the bottom of the inverter board and route the wires as shown in Figure 20 8 If you just installed a new display module peel off the protective plastic sheet 9 Fold the switch flex circuit assembly back over the display module and
6. Check Oscilloscope Channel 2 Bandwidth 36 This test checks the bandwidth of channel 2 1 First check the channel 1 bandwidth using the previous test Then perform these additional steps to check the channel 2 bandwidth MILUNUFI WAVEFORM OFF TRIGGER Trigger Source Ch2 Gating amp High Low High Low Method Min Max Setup Select Measrmnt IPRPe OK Select Measrmnt You may need to press Select Page to display this selection 2 Connect the TekScope instrument to the leveled sine wave generator as shown below Leveled sine wave 50 2 feedthrough generator terminator Ch2 Output BNC cable THS710A THS720A THS730A amp THS720P Service Manual Performance Verification Set the TekScope instrument VOLTS DIV to 100 mV div Set the TekScope instrument SEC DIV to 10 us div Set the leveled sine wave generator frequency to 50 KHz A ww RO Set the leveled sine wave generator output level so the peak to peak measurement is between 599 mV and 601 mV 7 Set the leveled sine wave generator frequency to 200 MHz if you are checking a THS730A 100 MHz if you are checking a THS720A or a THS720P or 60 MHz if you are checking a THS710A 8 Press MAG 9 Setthe TekScope instrument SEC DIV to 10 ns div 10 Check that the peak to peak measurement is 2425 mV THS710A THS720A THS730A amp THS720P Service Manu
7. 3 577 V 35 77 V 357 7 V 783 V 352 3 mV 0 583 V 3 523 V 35 28 V 352 3 V 559 V 358 0 3 580 kQ 5 95 35 80 358 0 kQ 3 580 MQ 35 23 MQ 60 8 mV 362 3 mV 3 623 V 36 23 V 362 3 V 801 V 367 7 mV 362 0 3 620 kQ 6 05 kQ 36 20 kQ 362 0 3 620 MQ 36 77 MQ 29 Performance Verification Performance Verification Procedures A Signal Path Compensation 30 In these procedures TekScope instrument setups are shown in tables Refer to Conventions on page x for information about how to use these tables Before beginning these procedures two conditions must first be met m The TekScope instrument must have been operating continuously for ten minutes within the operating temperature range specified m You must perform the Signal Path Compensation operation described below If the ambient temperature changes by more than 5 C you must perform the Signal Path Compensation operation again The time required to complete the entire procedure is approximately one hour WARNING Some procedures use hazardous voltages To prevent electrical shock always set voltage source outputs to 0 V before making or changing any interconnections Signal path compensation optimizes the oscilloscope accuracy for the current ambient temperature For maximum accuracy recompensate the signal path if the ambient temperature changes by 5 C or more To compensate the signal path perform the
8. Interior To clean the TekScope instrument interior perform the following steps 1 Blow off dust with dry low pressure deionized air approximately 9 psi 2 Remove any remaining dust with a lint free cloth dampened in isopropyl alcohol 75 solution and rinse with warm deionized water A cotton tipped applicator is useful for cleaning in narrow spaces and on circuit boards STOP If after performing steps 1 and 2 a module is clean upon inspection skip steps 3 and 4 Proceed with step 5 If steps 1 and 2 do not remove all the dust or dirt all modules in the instrument except the Display Module may be spray washed using a solution of 75 isopropyl alcohol Proceed with step 3 3 Spray wash dirty parts with the 75 isopropyl alcohol solution and wait 60 seconds for the majority of the alcohol to evaporate 4 Use hot 49 C to 60 C 120 F to 140 F deionized water to thoroughly rinse the parts 5 Dry all parts with low pressure deionized air 6 Dry all components and assemblies in an oven or drying compartment using low temperature 52 C to 66 125 to 150 F circulating air Lubrication There is no periodic lubrication required for the TekScope instru ment 66 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Removal and Installation Procedures This section describes how to remove and install the major mechanical and electrical modules It provides the followi
9. 4 divisions of center graticule NOTE One division of displacement from graticule center corresponds to a 50 ppm time base error THS710A THS720A THS730A amp THS720P Service Manual 39 Performance Verification Check Oscilloscope This test checks the edge trigger sensitivity for channel 1 Channel 1 Edge Trigger Sensitivity 1 Set up the TekScope instrument using the following steps SITUS UFIL SCOPE SAVE Recall Saved Recall Factory RECALL Setup Setup OK Recall Factory MEAS Gating amp High Low High Low Method Setup Select Measrmnt OK Select Measrmnt You may need to press Select Page to display this selection 2 Connect the TekScope instrument to the leveled sine wave generator as shown below Leveled Sine wave generator 50 2 feedthrough terminator Ch 1 Output BNC cable 40 THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 3 Set the leveled sine wave generator frequency to 200 MHz if you are checking a THS730A or to 100 MHz if you are checking a THS710A THS720A or THS720P Set the TekScope instrument VOLTS DIV to 500 mV div Press MAG Set the TekScope instrument SEC DIV to 10 ns div D X Set the leveled sine wave generator output level to approximately 50 mVp p so that the measured amplitude is approximately 500 mV The measured amplitude can fluctuate
10. If you are using both of the oscilloscope channels you must attach the probe reference lead for each channel directly to your circuit These attachments are required because the oscilloscope channels are electrically isolated they do not share a common chassis connection If you are also using the DMM you must also attach the DMM common lead to your circuit for the same reason as above Understand the voltage ratings for the probes you are using and do not exceed those ratings Two ratings are important to know and understand Wm The maximum measurement voltage from the probe tip to the probe reference lead The maximum floating voltage from the probe reference lead to earth ground These two voltage ratings depend on the probe and your application Refer to Specifications beginning on page 1 for more information WARNING To prevent electrical shock do not exceed the measurement or floating voltage ratings for the oscilloscope input BNC connector probe tip probe reference lead DMM input connector or DMM lead THS710A THS720A THS730A amp THS720P Service Manual e Theory of Operation Main Board Oscilloscope Signal Path Meter Signal Path Processor System Display System Power Supply Inverter Board This chapter describes the electrical operation of the TekScope instrument to the module level It describes the basic operation of each functional circuit block shown in Figure 6 The Main board assembly
11. 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 THS710A THS720A THS730A amp THS720P Service Manual 109 Mechanical Parts List Module Servicing Modules can be serviced by selecting one of the following three options Contact your local Tektronix service center or representative for repair assistance Module Exchange In some cases you may exchange your module for a reman ufactured module 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 TEK WIDE extension 6630 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 TekScope instrument Use this list to identify and order replacement parts The following table describes each column in the parts list Parts List Column Descriptions 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 replaceme
12. inverter board 10 Install the switch mat and front cover using the procedure on page 74 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Display module Inverter output connector o Route cable Inverter board through channels Inverter input 2 connector S Route cable Route cable through channel under clip Figure 20 Routing cables to the inverter board Back Cover You will need a inch flat bladed screwdriver and needle nose pliers to remove the chassis assembly and hole plugs from the back cover NOTE The back labels and battery contacts are an integral part of the back cover If any of these parts are defective the back cover must be replaced Removal First remove the front cover and switch mat using the procedure on page 73 Then use the following procedure to remove the chassis assembly 1 Place the instrument back side down on a soft surface 2 Liftthe battery connector located on the handle side of the chassis off its retaining pins and disconnect the connector 3 Insert the inch flat bladed screwdriver between the back cover and chassis at the location shown in Figure 21 THS710A THS720A THS730A amp THS720P Service Manual 81 Maintenance 4 Carefully lift the bottom of the ch
13. iu tee esa Sete ea Ys Preparation crore DURO Cebu Gee eee ee aed Preventing ESD es eid ERR AR RR a Inspection and Cleaning i sonan cena Removal and Installation Procedures Troubl shootinis uni n Een betta ore doa I dg ca eS Unpacking and Repacking Instructions OptiOns etes ean onte tnm ea teen on E Electrical Parts List occ isaac iesu eh ens ker hy hy ee Roe we Di agrams z vei ess vh e al Wiel gars AR e Mechanical Parts List cece cece cece cece a Parts Ordering Information 0 0 cece cee ence ees Using the Replaceable Parts List THS710A THS720A THS730A amp THS720P Service Manual vii Table of Contents List of Figures Figure 1 Removing and replacing the battery 16 Figure 2 AC adapter 16 Figure 3 Typical scope mode display 17 Figure 4 Typical meter mode display 18 Figure 5 Connector 22 Figure 6 Module level block 26 Figure 7 Location of adjustment lockout jumper 54 Figure 8 Oscilloscope adjustment setups 56 Figure 9 Meter adjustment setups 59 Figure 10 Relocating the
14. use this procedure to adjust the Procedure oscilloscope voltage references 1 2 Turn on the TekScope instrument and let it warm up for at least ten minutes Connect the fast rise square wave generator to the instrument as shown in the Square wave generator setup of Figure 8 Set the fast rise square wave generator to produce an amplitude between 250 and 300 mV and frequency between 450 Hz and 950 Hz inclusive Use the TekScope instrument setup below to start the oscilloscope adjust ment process For each step follow the specific instructions displayed by the instrument to connect the correct signal source and then confirm that you are ready to proceed to the next step MIINUHI se ss EG SCOPE UTILITY System Cal Factory Scope OK Factory Cal Scope NOTE During some steps the instrument may appear to be idle for several minutes while it is processing information internally Please have patience 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 Completing the After adjusting the oscilloscope continue with one of the following steps Adjustment Process Proceed to Meter Adjustment on page 58 to adjust
15. 50 MHz measured on MATH Ch1 Ch2 waveform with test signal applied between signal and common of both channels and with the same VOLTS DIV and coupling settings on each channel gt 100 1 at 50 MHz measured on one channel with test signal applied between signal and common of the other channel and with the same VOLTS DIV and coupling settings on each channel 55 pF 2 8 bit resolution separate digitizers for each channel sample simultaneously 5 mV div to 50 V div at input BNC Normal and Invert 10 divisions THS710A THS720A THS720P THS730A 60 MHz at input 100 MHz at 100 MHz at 200 MHz at BNC input BNC input BNC input BNC 90 MHz above 90 MHz above 180 MHz 35 C 35 C above 35 C THS710A THS720A THS720P THS730A 50 MHz 75 MHz 75 MHz 85 MHz Selectable between 20 MHz or full x10 Hz at BNC reduced by a factor of ten when using a 10X passive probe THS710A THS720A THS720P THS730A 1 75 ns THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 1 Oscilloscope specifications Cont Vertical Peak Detect or Enve lope Pulse Response typical DC Gain Accuracy Position Accuracy DC Measurement Accuracy Average Acquisition Mode Using 16 Wave forms DC Measurement Accuracy Sample Acq Mode typical Horizontal Sample Rate Range Record Length SEC DIV Range including MAG Sample Rate and Delay Time Accuracy Delay Time Range Internal Tri
16. 8998 00 348 1426 00 437 0453 10 174 3487 01 174 3366 01 1 00 12 3 5 441 2066 01 671 3673 346 0280 00 346 0280 20 THS710A THS720A THS730A amp THS720P Service Manual Mechanical Parts List Figure 29 Exploded diagram 113 THS710A THS720A THS730A amp THS720P Service Manual Mechanical Parts List 114 Table 9 lists the replaceable standard accessories for the TekScope instrument and the instrument options that included them in the original shipment These accessories are not shown in Figure 29 Table 9 Replaceable standard accessories Tektronix Part Number or Instrument Options That Nomenclature Description of Accessory Include the Accessory P6117 Passive 10X probes All THS7BAT Battery pack All 119 7285 XX Power supply AC to DC external None 161 0066 00 Power Cord North American A0 161 0066 09 Power Cord Universal European A1 161 0066 10 Power Cord UK A2 161 0066 13 Power Cord Australia A3 161 0298 00 Power Cord Japan A6 161 0304 00 Power Cord China A10 012 1364 XX 2 m RS 232 cable All 103 0403 XX RJ 45 to 9 pin female adapter Al 070 9731 XX User and Reference Manuals All except L1 through L9 English 070 9732 XX User and Reference Manuals L1 French 070 9733 XX User and Reference Manuals L3 German 070 9734 XX User and Reference Manuals L2 Italian 070 9735 XX User and Reference Manuals L9 Korean 070 9736 XX User and Reference Manuals L6
17. Service Manual Maintenance 12 Using a bent paper clip momentarily short pins 15 and 17 of the connector to bypass the ON STBY switch as shown in Figure 28 Follow the instruc tions in the table below Instructions Inspect and or clean the switch flex circuit assembly and the switch mat If cleaning does not solve the problem one or the other are defective Replace them both Instrument Behavior Instrument turns on The main board is probably defective Replace it Instrument does not turn on Figure 28 Bypassing the ON STBY switch THS710A THS720A THS730A amp THS720P Service Manual 93 Maintenance Backlight Follow these steps to troubleshoot a nonfunctional backlight 1 Remove the front cover using the procedure Front Cover on page 73 2 Turn the instrument on remove the switch mat and then fold the switch flex circuit assembly toward you to access the inverter board of the inverter board The output connector is the one closest to the display WARNING To avoid electrical shock do not touch the two wire output connector module 3 Using a DMM measure the DC voltage across pins 1 and 2 of the input connector on the inverter board Follow the instructions in the table below Voltage Measurement at Inverter Input Connector Instructions Approximately 0 Check that the inverter input cable is properly connected at both ends Fold the switch flex circuit assembly back ov
18. Service Safety Summary Preface Asa Gar tee BAS Save C IA eere WES AEE 1 R lated Manuals 5 5 dies nh seat Aa oe A bey EL REN RDpGU RARUS CONVENTIONS dues ee EI Hea EA awh eod ue VR EN S ed Specifications WS s Operating Information Internal and External Power Sources Understanding the Front 1 Connecting and Using the Probes Theory of Operation Maim Board 15 oa eh dte iem eet Dates gee chm Inverter Boards lle oe detestatur Deu a Display Modul 5 0 regret eb reete ah eee Switch Assembly eave E EE Performance Verification Test Record oec dea ea s ee cea ee AS PU Em s Performance Verification Procedures Adjustment Procedures Required Equipment 0 0 0 cece ence eens Overview of the Adjustment Process Accessing the Adjustment Lockout Jumper Oscilloscope Adjustment Meter Adjustment siaura cece hne Replacing the Adjustment Lockout Maintenance
19. Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Oscilloscope specifications 1 DMM specifications 8 General specifications 10 Summary of oscilloscope adjustment steps 55 Summary of meter adjustment steps 58 Internal inspection checklist 65 Removal and installation procedures 68 TekScope instrument options 103 Replaceable standard accessories 114 THS710A THS720A THS730A amp THS720P Service Manual iii Table of Contents iv THS710A THS720A THS730A amp THS720P Service Manual a a General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it Only qualified personnel should perform service procedures Connect and Disconnect Properly Do not connect or disconnect probes or test leads while they are connected to a voltage source 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 a
20. Trigger Trigger Sensitivity Edge Trigger Type typical Trigger Level Range Motor Trigger Level Range THS720P Trigger Level Accuracy typical SET LEVEL TO 50 typical Width Range Pulse Trigger Type typical Width Tolerance Range Pulse Trigger Type typical Sensitivity Video Trigger Type typical Signal Formats and Field Rates Video Trigger Type Holdoff Range External Trigger External Trigger Max imum Input Voltage External Trigger Coupling External Trigger Levels External Trigger Sensitivity Coupling Sensitivity NOISE REJ 3 5 times the DC coupled limits HF REJ 1 5 times the DC coupled limit from DC to 30 kHz attenuates signals above 30 kHz LF REJ 1 5 times the DC coupled limits for frequencies above 1 kHz attenuates signals below 1 kHz 4 divisions from center of screen 0 1 to 5 divisions from center screen polarity depends on slope selection 0 2 divisions for signals having rise and fall times 20 ns Operates with input signals gt 50 Hz 99 ns to 1 s with resolution of 33 ns or approximately 1 of setting whichever is greater 5 10 15 or 20 Composite video signal with negative sync pulse amplitude from 0 6 to 2 5 divisions Broadcast systems Supports NTSC PAL and SECAM Interlaced Trigger on selected line of odd field selected line of even field or any line Non interlaced Trigger on selected line or any line Line Rates 15 kHz to 65 kHz i
21. Vpc to 22 Vpc Pin 8 0 V ground Pin 9 5 Voc Pin 10 1 89 MHz clock 528 ns period 50 duty cycle appears in bursts high 5 V low 0 V Pin 11 19 3 kHz clock 51 7 us period 16 duty cycle high 5 V low 0 V Pin 12 closest to BNC end of 75 5 Hz clock 13 2 ms period 0 4 duty cycle instrument high 5 V low 0 V 7 Ifall the signals are present on the loose end of the connector turn the 10 11 12 13 14 instrument off and then reinstall the display module using the procedure on page 80 Turn the instrument on If the problem persists the display module is probably defective Replace it Remove the chassis assembly from the back cover using the procedure Back Cover on page 81 Place the chassis assembly on a soft static free surface with the main board facing up and the switch flex circuit assembly folded out toward you Install the switch mat on the switch flex circuit assembly Check and if necessary reconnect the display cable connection to the main board Inspect the display cable for any sign of damage if damage is evident replace it Connect the AC adapter to the instrument and turn it on Verify that the instrument is on by probing the PROBE COMP output Probe the display signals at the display connector of the main board as was done in step 6 If some or all of the signals are not present at the main board display connector the main board is probably defective Replac
22. a menu item If a pop up menu appears continue to press the bezel button to choose an item in the pop up menu You may need to press the Select Page button to access additional menu items Recall Factory Setup Recall setup 1 factory Save Recall Save Recall Current Saved chi Saved Recall Setup Setup Waveform Factory THS710A THS720A THS730A amp THS720P Service Manual 19 Operator Information 3 After choosing some menu items you need to set a numerical parameter to complete the setup Use the rocker to adjust the parameter or press the TOGGLE button to reset the parameter to its default value Recall Factory Setup Recall setu save Recall Save Recall OK Current Saved chi Saved Recall Setup setup Waveform Setup TOGGLE g 4 Ifthe OK bezel button is displayed press it to confirm your choice Recall Factory setup Recall setu save Recall Save Recall OK Current Saved chi Saved Recall Setup setup Waveform Setup NOTE In the Performance Verification Adjustments and Maintenance chapters of this manual TekScope instrument setups are shown in tables Refer to Conventions on page x for information about reading these tables 20 THS710A THS720A THS730A amp THS720P Service Manual Operator Information Using the Dedicated Buttons BE eae RD 0 15 00 eere co ole You can use the dedicated buttons below to take direct actions
23. around 500 mV 8 Press SET LEVEL TO 50 Adjust TRIGGER LEVEL as necessary and then check that triggering is stable 9 Change the TekScope instrument setup using the following steps SCOPE MIMLUMUFIL 10 Press SET LEVEL TO 50 Adjust TRIGGER LEVEL as necessary and then check that triggering is stable 11 Change the TekScope instrument setup using the following steps SCOPE TRIGGER rising edge 12 Proceed to the next test to check the channel 2 edge trigger sensitivity THS710A THS720A THS730A amp THS720P Service Manual 41 Performance Verification Check Oscilloscope This test checks the edge trigger sensitivity for channel 2 Channel 2 Edge Trigger Sensitivity 1 First check the channel 1 edge trigger sensitivity using the previous test Then perform these additional steps to check the channel 2 edge trigger sensitivity MILINUFI WAVEFORM OFF TRIGGER Trigger Source Ch2 Gating amp High Low High Low Method Setup Select Measrmnt OK Select Measrmnt You may need to press Select Page to display this selection 2 Connect the TekScope instrument to the leveled sine wave generator as shown below Leveled sine wave generator 42 BNC cable 50 2 feedthrough terminator Ch2 Output THS710A THS720A THS730A amp THS720P Service Manual P
24. doing maintenance m Inspection and Cleaning provides procedures for inspecting the TekScope instrument and cleaning its external and internal modules m Removal and Installation Procedures provide procedures for the removal and installation of modules m Troubleshooting provides information for isolating failed modules m Unpacking and Repacking Instructions provides packaging information for shipment or storage Preparation Only qualified personnel should perform service procedures Read the Service Safety Summary and the General Safety Summary before performing any service procedures Also refer to the chapter Operating Information for information about using the TekScope instrument Preventing ESD When performing any service which requires internal access to the TekScope instrument adhere to the following precautions to avoid damaging internal modules and their components due to electrostatic discharge ESD CAUTION Static discharge can damage any semiconductor component in this instrument 1 Minimize handling of static sensitive modules 2 Transport and store static sensitive modules in their static protected containers or on a metal rail Label any package that contains static sensitive modules THS710A THS720A THS730A amp THS720P Service Manual 63 Maintenance 3 Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Do service of stat
25. down on the switch flex circuit assembly The five rubber guideposts fit into holes in the circuit board 12 Place the front cover assembly onto the instrument Taking care not to pinch the handle align it into the guides in the front cover Align the buttons so they all protrude through the holes in the front cover 13 Holding the case together pick it up and place it front side down on a soft surface CAUTION To avoid cross threading or cutting new threads with the screws carefully follow the procedure in the next step 14 To install the four screws follow these steps a Place the screws into their holes in the back cover b Using the torque limiting Torx T 15 screwdriver slowly turn each screw backward counterclockwise until you feel the thread drop and then gently tighten the screw turn clockwise into the existing thread THS710A THS720A THS730A amp THS720P Service Manual Adjustment Procedures When all four all screws are in hold a corner of the case together firmly to compress the gasket while tightening its screw until snug Repeat for the other corners Do not overtighten the screws 14 in Ibs or 1 5 N m maximum torque 15 Replace the battery as shown on page 16 and then close the battery door Oscilloscope Adjustment Three equipment setups shown in Figure 8 are required to complete this adjustment procedure For each step in the procedure the specific input signal required by that
26. its screw until snug Repeat for the other corners Do not overtighten the screws 12 in lbs or 1 m N m maximum torque 9 Replace the battery as shown on page 16 and then close the battery door You will need a lt inch flat bladed screwdriver to remove the display module and inverter board Removal First remove the front cover and switch mat using the procedure on page 73 Then use the following procedure to remove the display module and inverter board 1 Fold the switch flex circuit assembly toward you to expose the display module and inverter board CAUTION To avoid scratching the surface of the display module do not let it touch any hard object The display module surface may scratch easily To clean it first try pressurized air If a soft cloth is required to clean it use very light pressure 2 remove the inverter board unplug the input and output connectors and then lift the inverter board off the two guideposts You may want to use the 1 inch flat bladed screwdriver to help release the connectors from their sockets 3 To remove the display module follow these steps a Disconnect the cable from the display module to the inverter board if it is not already disconnected b Lift the right side of the display module out of the chassis and fold the display module to the left as shown in Figure 18 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Display module
27. the meter voltage references Proceed to Replacing the Adjustment Lockout Jumper on page 61 to protect the instrument from inadvertent readjustment THS710A THS720A THS730A amp THS720P Service Manual 57 Adjustment Procedures Meter Adjustment 58 Three equipment setups shown in Figure 9 are required to complete this adjustment procedure For each step in the procedure the specific input signal required by that step is described in the TekScope instrument display Refer to these diagrams as necessary during the procedure Table 5 summarizes the steps in the procedure and the signal requirement for each step Table 5 Summary of meter adjustment steps Step Signal or Resistance Source Setting 6 400 0 500 Hz 10 600 0 Vans 500 Hz In steps 17 and 18 the DC voltage source must be able to sink approximately 1 mA supplied by the TekScope instrument You must determine whether or not your DC voltage source is capable of sinking current supplied by a device under test If the DC voltage source cannot sink current you can connect a 470 1 W shunt resistor across the output of the DC voltage source during steps 17 and 18 only The shunt resistor will accommodate the current supplied by the TekScope instrument THS710A THS720A THS730A amp THS720P Service Manual Adjustment Procedures DC voltage setup DC voltage source Banana cables p 1 AC voltage source
28. 0 div increase in peak to peak noise Sample acquisition mode full bandwidth otherwise 1 0 div increase in peak to peak noise 3 Applies to instrument operating with Tektronix supplied AC adapter THS710A THS720A THS730A amp THS720P Service Manual 13 Specifications 14 THS710A THS720A THS730A amp THS720P Service Manual E Operating Information This chapter provides a quick overview of the following topics Internal and external power sources Understanding the front panel m Connecting and using the probes For more detailed information about TekScope instrument operation refer to the THS710A THS720A THS730A amp THS720P User Manual For information about unpacking and inspecting the instrument refer to Unpacking and Repacking Instructions on page 102 of this manual Internal and External Power Sources Using the Battery Pack A You can power the TekScope instrument from the internal battery pack or from the AC adapter both are standard accessories Before using the battery for the first time it must be charged You can use external power to charge the battery pack while it is in the TekScope instrument Or you can charge the battery pack with the optional external battery charger Typical battery charging times are listed below Configuration Battery pack in TekScope instrument Typical Charging Time 9 hours Battery pack in external charger 1 5 hours You can remove and replace the b
29. 10A LABEL FRONT PANEL THS720A LABEL FRONT PANEL THS730A LABEL FRONT PANEL THS720P FRONT COVER THS710A THS720A THS730A FRONT COVER THS720P DISPLAY SHIELD CLEAR LEXAN GASKET NEOPRENE 35 0 X 0 045 OD SWITCH MAT ELASTOMERIC SWITCH FLEX CIRCUIT ASSY DISPLAY MODULE LCD W BACKLIGHT SPRING 0 74 X 0 185 OD FOAM PAD SET CIRCUIT BD ASSY MAIN THS710A CIRCUIT BD ASSY MAIN THS720A CIRCUIT BD ASSY MAIN THS730A CIRCUIT BD ASSY MAIN THS720P BATTERY DOOR HOLE PLUG SET DC POWER AND I O PORT SCREW THREAD FORMING 1 79 X 31 MM T 15 TORX LABEL BACK COVER MARKED UL AND CE TILT STAND ASSY BACK COVER CONTACT ASSY BATTERY CABLE ASSY INVERTER TO MAIN BD 5 CONDUCTOR CABLE ASSY DISPLAY TO MAIN BD 12 CONDUCTOR CHASSIS ASSY INCLUDES BNC CONNECTORS AND BANANA JACKS CIRCUIT BD ASSY INVERTER HANDLE BLACK WEBBING THS710A THS720A THS730A HANDLE YELLOW WEBBING THS720P Mfr Code 22670 22670 22670 22670 TK1163 TK1163 85471 0KB01 0BL82 22670 80009 8X345 85471 80009 80009 80009 80009 TK1163 TK1163 0 01 22670 1163 1163 2469 2469 10 20 1163 80009 2539 2539 Mfr Part Number 334 9310 00 334 9310 10 334 9310 20 334 931 0 30 437 0451 10 437 0451 20 337 4010 00 348 1475 00 260 2615 00 259 0098 00 119 4985 11 214 4706 00 348 1441 00 671 3923 0 671 3923 1 671 4010 0 671 3923 2 200 4214 00 200 4267 00 213 1099 00 334
30. AN 7 INDUSTRIAL WAY 2040 15TH AVENUE WEST 1770 LA COSTA MEADOW DR P O BOX 500 6136 NE 87TH AVENUE 5858 SW WILLOW LANE 9898 SW TIGARD ST 3000 LEWIS AND CLARK HWY SUITE 2 315 S MONTGOMERY P O BOX 2231 THS710A THS720A THS730A amp THS720P Service Manual City State Zip Code VAN NUYS CA 91405 PORTLAND OR 97214 4657 SALEM NH 03079 SEATTLE WA 98119 2783 SAN MARCOS CA 92069 BEAVERTON OR 97077 0001 PORTLAND OR 97220 LAKE OSWEGO OR 97035 TIGARD OR 97223 VANCOUVER WA 98661 SHERMAN TX 75070 5070 111 Mechanical Parts List Replaceable Parts List Fig amp Index Number 10 1 10 10 11 12 13 112 Tektronix Part Number 334 9310 00 334 9310 10 334 9310 20 334 9310 30 437 0451 10 437 0451 20 337 4010 00 348 1475 00 260 2615 00 259 0098 00 119 4985 11 214 4706 00 348 1441 00 671 3923 0 671 3923 1 671 4010 0 671 3923 2 200 4214 00 200 4267 00 213 1099 00 334 8998 00 348 1426 00 437 0453 10 174 3487 01 174 3366 01 174 3367 00 441 2066 01 671 3673 346 0280 00 346 0280 20 SerialNo Serial No Effective Discont d B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 B010100 Qty Name amp Description 1 1 1 LABEL FRONT PANEL THS7
31. HS710A THS720A THS730A amp THS720P Service Manual Maintenance Installation Use this procedure to reassemble the entire instrument 1 Check that the ten foam pads on the chassis are correctly installed The foam pads that surround the display module should be aligned to locating marks in the chassis Refer to Figure 25 for the locations of all the foam pads Typical locating marks Align this foam pad with bottom edge of chassis Figure 25 Foam pad locations on the chassis 2 Place the main board on a soft static free surface with the two metal shields facing up and away from you 3 Install the inverter board cable either end into its connector J7 on the main board 4 To reconnect the switch flex circuit assembly to the main board follow these steps a Hold the switch flex circuit assembly upright with the carbon contacts facing you b Use both thumbs and forefingers to grasp the left and right sides of the connector c From both sides push the connector into its socket You may need to alternate pushing on the left and right sides to insert the connector THS710A THS720A THS730A amp THS720P Service Manual 87 Maintenance 5 To prepare the main board and switch flex circuit board for installation into the chassis follow these steps a b Fold the switch flex circuit assembly toward you Dress the battery wires away from you Dress the two coaxial cables that will connect to the B
32. NC connectors to a position under the main board Dress the two wires that will connect to the banana jacks to a position under the main board 6 To install the main board and switch flex circuit assembly into the chassis follow these steps a 88 Place the chassis on a soft static free surface with the BNC connectors facing away from you and the banana jacks facing left Lift the main board and switch flex circuit assembly together and turn them over keeping the switch flex circuit assembly facing you Place the main board and switch flex circuit assembly on the chassis so that you can attach the two wires to the back of the banana jacks Use the needle nose pliers to attach both wires to the back side of the banana jacks Be careful not to deform the connectors attached to the wires Dress the wires so that they will fit between the main baord and the chassis Insert the four tabs on the left side of the main board into their rectangu lar holes in the chassis as shown in Figure 26 While lowering the right side of the main board dress the battery wires into the slot in the chassis When the main board is lowered in place snap it into the six retaining snaps of the chassis Use the needle nose pliers to insert both coaxial connectors into the back side of the BNC connectors Be careful not to crush the cable or bend the center conductor THS710A THS720A THS730A amp THS720P Service Manual Maintenance Inse
33. Portuguese 070 9737 XX User and Reference Manuals L4 Spanish 070 9738 XX User and Reference Manuals L7 Simplified Chinese 070 9739 XX User and Reference Manuals L8 Traditional Chinese THS710A THS720A THS730A amp THS720P Service Manual Mechanical Parts List Table 9 Replaceable standard accessories Cont Tektronix Part Number or Nomenclature 070 9740 XX 071 0011 XX 070 9741 XX 070 9742 XX 070 9743 XX 070 9744 XX 070 9745 XX 070 9746 XX 070 9747 XX 070 9748 XX 070 9749 XX 070 9799 XX Description of Accessory User and Reference Manuals Japanese User Manual Russian Replacement Reference Manual only English Replacement Reference Manual only French Replacement Reference Manual only German Replacement Reference Manual only Italian Replacement Reference Manual only Korean Replacement Reference Manual only Portuguese Replacement Reference Manual only Spanish Replacement Reference Manual only Simplified Chinese Replacement Reference Manual only Traditional Chinese Replacement Reference Manual only Japanese THS710A THS720A THS730A amp THS720P Service Manual Instrument Options That Include the Accessory None None None None None None None None None 115 Mechanical Parts List 116 THS710A THS720A THS730A amp THS720P Service Manual
34. Proceed to Replacing the Adjustment Lockout Jumper on page 61 to protect the instrument from inadvertent readjustment THS710A THS720A THS730A amp THS720P Service Manual Adjustment Procedures Replacing the Adjustment Lockout Jumper After you complete the adjustment process you should reinstall the adjustment lockout jumper to prevent inadvertent loss of calibrration To replace the jumper repeat the procedure Accessing the Adjustment Lockout Jumper on page 53 However in place of step 9 reinstall the jumper onto pins 1 and 2 as shown in Figure 10 mn ON 4 i oram inj Tir 9 d p zi 4 4 2 Adjustment lockout jumper position 7 Figure 10 Relocating the adjustment lockout jumper This completes the adjustment procedure THS710A THS720A THS730A amp THS720P Service Manual 61 Adjustment Procedures 62 THS710A THS720A THS730A amp THS720P Service Manual EPI Maintenance This chapter contains the information needed to do periodic and corrective maintenance on the TekScope instrument The following sections are included Preparation refers you to important information contained elsewhere in this manual m Preventing ESD provides general information on preventing damage to internal modules when
35. Service Manual Tektronix THS710A THS720A THS730A amp THS720P TekScope 070 9752 02 This document applies to to serial number B010100 and above and firmware version 1 00 and above First printing February 1998 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 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 supercedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc Tek Secure is a registered trademark of Tektronix Inc TekTools TekScope and IsolatedChannel are trademarks of Tektronix Inc Pursuant to DFARS 252 227 7013 e Tektronix Inc hereby grants to the Government a nonexclusive paid up license throughout the world of the scope set forth therein for Government purposes for any commercial manuals provided by Tektronix Inc under this contract Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For produc
36. Summary and Service Safety Summary found at the beginning of this manual Also to prevent possible injury to service personnel or damage to electrical components read Preventing ESD on page 63 If you replace the main board you must adjust the instrument after repair Refer to the chapter Adjustment Procedures for information about adjustment You may need the the following tools and equipment to troubleshoot the instrument Tools and Equipment Example AC adapter Standard accessory to TekScope instrument Battery pack fully charged Standard accessory to TekScope instrument Oscilloscope with 10X probe Tektronix TDS 300 or TDS 400 series with standard accessory probe DMM Tektronix DMM200 or DMM300 series handheld multimeter 16 inch flat bladed screwdriver Hunter 30312 Metal paper clip Common office accessory Begin with these steps to isolate a defective module Some steps direct you to other procedures in this section 1 Install a charged battery connect the AC adapter and then turn on the TekScope instrument If after a short wait the display backlight turns on and the display appears to operate normally then skip to Executing Diagnostics on page 97 2 If after a short wait the display backlight turns on but the display shows any of the following symptoms turn off the instrument immediately Skip to Display on page 95 m Display color is dark blue or violet when viewed straight on m Display color is abnormal gr
37. These buttons do not require the use of menus CLEAR MENU Om 4 1 HARD GES VERTICAL MESES HORIZONTAL TRIGGER E VOLTS DIV POSITION TRIGGER X TR g SET LEVEL WAVEFORM MAG TO 50 OFF CS 6 D gt oM UN D mE 10 11 12 13 THS710A THS720A THS730A amp THS720P Service Manual 9 13 12 11 10 9 8 7 HARD COPY Initiates a hard copy using the RS 232 port HOLD Stops restarts oscilloscope acquisition or holds resets meter readout AUTORANGE Selects oscilloscope or meter autorange function CLEAR MENU Clears menu from display TRIGGER LEVEL Adjusts trigger level SET LEVEL TO 50 Sets trigger level to midpoint of oscilloscope waveform HORIZONTAL POSITION Adjusts oscilloscope waveform horizontal position MAG Turns 10X horizontal magnification on and off SEC DIV Adjusts waveform horizontal scale factor for oscilloscope or data logger VERTICAL POSITION Adjusts oscilloscope waveform vertical position WAVEFORM OFF Removes selected oscilloscope waveform from display VOLTS DIV Adjusts oscilloscope vertical scale factor or meter range ON STBY Selects on or standby Does not disconnect power from the instrument 21 Operator Information 14 CH 1 CH 2 MATH REF A REF B Displays waveform and chooses selected waveform In harmonics mode THS720P CH 1 and CH 2 also display harmonics of voltage and current wa
38. adjustment lockout jumper 61 Figure 11 Removing the tilt stand 70 Figure 12 Installing the tilt stand 71 Figure 13 Installing a new front panel label 72 Figure 14 Removing the battery 74 Figure 15 Assembling a new front cover 75 Figure 16 Installing the gasket 76 Figure 17 Installing the handle 77 Figure 18 Removing the display module 79 Figure 19 Opening the display cable connector 80 Figure 20 Routing cables to the inverter board 81 Figure 21 Lifting the chassis eene 82 Figure 22 Foam pad and hole plug locations on the back cover 83 Figure 23 Routing the battery 84 Figure 24 Removing the main board and switch flex circuit ASSEM DIY ab averse wide enel ne MEER P Ed 86 Figure 25 Foam pad locations on the chassis 87 Figure 26 Reassembling the chassis 89 Figure 27 Battery connector location 91 Figure 28 Bypassing ON STBY switch 93 Figure 29 Exploded diagram 113 ii THS710A THS720A THS730A amp THS720P Service Manual Table of Contents List of Tables Table 1
39. age Source Range Output Level 400 mV 60 mV 400 mV 360 mV 4V 3 6 V 40 V 36 V 400 V 360 V 880 V 792 V 5 Set the DC voltage source output level to 0 V THS710A THS720A THS730A amp THS720P Service Manual Accuracy Limits 59 2 mV to 60 8 mV 357 7 mV to 362 3 mV 3 577 V to 3 623 V 35 77 V to 36 23 V 357 7 V to 362 3 V 783 V to 801 V 45 Performance Verification Check Meter AC Voltage Accuracy 46 This test checks the meter AC voltage accuracy 1 Set the AC voltage source output level to 0 V 2 Set up the TekScope instrument using the following steps METER MILUNUFI 3 Connect the TekScope instrument to the AC voltage source as shown below AC voltage source Banana cables THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 4 Set the AC voltage source output frequency to 500 Hz 5 For each range set the AC voltage source output to the level listed below and then compare the meter reading to the accuracy limits AC Voltage Source Range Output Level 400 mV 360 mV 4V 600 mV 4V 3 6 V 40 V 36 V 400 V 360 V 640 V 576 V 6 Set the AC voltage source output level to 0 V THS710A THS720A THS730A amp THS720P Service Manual Accuracy Limits 352 3 mV to 367 7 mV 0 583 V to 0 617 V 3 523 V to 3 677 V 35 23 V to 36 77 V 352 3 V to 367 7 V 559 V to 593 V 47 Performance Verification Check Meter R
40. al 37 Performance Verification Check Oscilloscope This test checks the oscilloscope time base accuracy Sample Rate and Delay Time Accuracy 1 Set up the TekScope instrument using the following steps SITUS UFIL SAVE Recall Saved RECALL Setup OK Recall Factory VERTICAL Probe Type Set to 1X MENU 2 Connect the TekScope instrument to the time mark generator as shown below Time mark generator 50 lt feedthrough terminator Output BNC cable 3 Set the time mark generator period to 10 ms 4 Set the TekScope instrument VOLTS DIV to 500 mV div 5 Use the vertical POSITION rocker to center the test signal on screen 38 THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 6 Press SET LEVEL TO 50 7 Press MAG 8 Change the TekScope instrument setup using the following steps METER SCOPE HORIZON TAL MENU CLEAR MENU 9 Set the delayed time base SEC DIV to 50 ms div 10 Change the TekScope instrument setup using the following steps MILUNUFI HORIZON TAL MENU MIL uri 140411214 Delayed Runs After Set delay time to Main 10 ms Time Base 11 Set the delayed time base SEC DIV to 500 ns div 12 Check that the rising edge of the marker crosses the center horizontal graticule line within
41. als the internal components against common dust and dirt However if it appears that the instrument may have been damaged or has been exposed to an unusually dirty or wet environment you should inspect and clean the interior To inspect and clean the interior disassemble the instrument according to the procedure Complete Disassembly on page 85 Inspect the internal portions of the instrument for damage and wear using Table 6 as a guide Defects found should be repaired immediately Table 6 Internal inspection check list Item Repair Action Front and Back Cover Cracks or deformations Scratched Repair or replace defective hard lettering or display filter Loose ware connectors or labels Hole Plugs Gasket Misplaced or missing pieces Relocate or replace defective and Foam Pads pieces Circuit boards Loose broken or corroded solder Remove failed module and replace connections Burned circuit with a new module boards Burned broken or cracked circuit run plating THS710A THS720A THS730A amp THS720P Service Manual 65 Maintenance Table 6 Internal inspection check list Cont Item Inspect For Repair Action Solder connections Cold solder or rosin joints Resolder joint and clean with isopropyl alcohol Wiring and cables Loose plugs or connectors Burned broken or frayed wiring Firmly seat connectors Repair or replace modules with defective wires or cables Cleaning Procedure
42. assis out of the back cover As the chassis assembly comes out pull it toward you to back the BNC connectors out of their holes in the back cover Figure 21 Lifting the chassis 5 When the chassis is free from the back cover set it aside with the main board facing down on a soft static free surface 6 To remove a defective DC power hole plug or I O port hole plug follow these steps a From the outside of the back cover pull on the hole plug b From the inside of the back cover use the l6 inch flat bladed screwdriver to work each retaining tab out of its hole in the back cover Installation Use this procedure to install the hole plugs and chassis assembly into the back cover 1 install a new hole plug insert the retaining tabs into their holes in the back cover While pushing on the plug from the outside pull gently on the tabs from the inside with the needle nose pliers until they lock into place 2 To install the chassis assembly into the back cover follow these steps a Ifthe instrument was completely disassembled check that the chassis is properly assembled b Check that all foam pads inside the back cover are correctly installed Refer to Figure 22 for the correct locations 82 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Install DC power hole plug FEN S Install foam pads lt
43. ation for the instrument is contained in the related manuals listed below Language English French German Italian Korean Portuguese Spanish Simplified Chinese Traditional Chinese Japanese User Manual Part Number 070 9731 XX 070 9732 XX 070 9733 XX 070 9734 XX 070 9735 XX 070 9736 XX 070 9737 XX 070 9738 XX 070 9739 XX 070 9740 XX THS710A THS720A THS730A amp THS720P Service Manual Reference Part Number 070 9741 XX 070 9742 XX 070 9743 XX 070 9744 XX 070 9745 XX 070 9746 XX 070 9747 XX 070 9748 XX 070 9749 XX 070 9799 00 Programmer Manual Part Number 070 9751 XX Preface Conventions In the Performance Verification Adjustments and Maintenance chapters of this manual TekScope instrument setups are shown in tables similar to the one shown below The header of each table contains icons that represent the controls and menu items used to set up the instrument To make a specific setup read the table from left to right and then from top to bottom as shown below The table contains the symbol if no action is required TOGGLE See c n MALUMUFI 1 Choose scope 2 Press this but 3 Press this 4 Press the mode or meter mode ton on the front panel bezel button bezel button again until this selection is high lighted 5 Use the rocker to set the value for a parameter
44. attery pack without losing any saved information The current setup saved setups saved waveforms and saved data are stored in nonvolatile memory that does not depend on battery power To prevent loss of saved information set the ON STBY switch to STBY before removing the battery pack See Figure 1 for instruction to remove and replace the battery WARNING To avoid shock hazard the battery door must remain closed in wet or damp conditions THS710A THS720A THS730A amp THS720P Service Manual 15 Operator Information Pd Battery pack S T Q Figure 1 Removing and replacing the battery Using External Power For benchtop operation you can use external power Attach the AC adapter as shown in Figure 2 The DC INPUT disconnects itself if an overvoltage is applied If this occurs disconnect and then reconnect the AC adapter to resume operation from external power WARNING To avoid shock hazard the DC input and I O port hole plugs must remain closed in wet or damp conditions External power to DC INPUT ce gt ee Figure 2 AC adapter attachment 16 THS710A THS720A THS730A amp THS720P Service Manual Operator Information CAUTION To avoid overheating do not connect external power while the instrument is in a confined space such as in the soft case Understanding the Front Panel The SCOPE and METER buttons select the operating mode The front panel has additional buttons
45. contains the following oscilloscope and meter functions Each of the two oscilloscope input signals enters the main board and passes through an attenuator and buffer amplifier Then each signal passes through an isolation interface before reaching the trigger circuitry a sampler and a digitizer The digitized signals are written into system memory for transfer to the display system The DMM input enters the Main board and passes through a switching network to select the meter function and range The DMM signal is then sampled and digitized The processor system contains a 68331 microprocessor that controls the entire instrument The processor passes waveforms meter readings and text on to the display system The processor system also contains flash ROM system RAM and the RS 232 keyboard and probe compensation interfaces The display system consisting of a display controller and video memory processes text and waveforms to refresh the display The power supply provides DC power to ciruits on the main board and generates an AC voltage to provide power to the attenuators and buffer amplifiers across the isolation interfaces It also provides 12 V and 20 V for the display module The inverter board generates an AC voltage for the display backlight THS710A THS720A THS730A amp THS720P Service Manual 25 Theory of Operation Display Module The display module consists of a liquid crystal display LCD a display driver an
46. d a flourescent backlight Switch Assembly The switch assembly is a matrix of switches that form the front panel buttons The switch assembly consists of a flex circuit board and an elastomeric switch mat Switch closures are read by the processor system EXT PWR J8 Main board PROBE COMP Adjustment gt J9 lockout x 8 J3 COM Not used 29 J1 c u c o Display assembly Inverter board Switch assembly Figure 6 Module level block diagram 26 THS710A THS720A THS730A amp THS720P Service Manual _ RY a Performance Verification This chapter contains performance verification procedures for the specifications marked with the symbol The following equipment or a suitable equivalent is required to complete these procedures Description DC Voltage Source AC Voltage Source Resistance Standard Leveled Sine Wave Generator Time Mark Generator Banana to Banana Cable two required 50 BNC Cable 50 Q Feedthrough Termina tion Dual Banana to BNC Adapter Minimum Requirements 60 mV to 800 V 0 1 accu racy 300 mV to 640 V 0 5 accuracy at 500 Hz 360 Q to 36 MQ 0 1 accuracy 50 kHz and 100 MHz 3 amplitude accuracy 10 ms period 50 ppm accu racy Shielded banana jacks on each end BNC male to BNC male 36 in 1 m long BNC male and female con nectors Banana plugs to BNC female THS710A THS720A THS730A amp THS720P Servic
47. d that the channel 1 channel 2 or DMM signal is not getting into the instrument as expected 1 2 Remove the front cover using the procedure Front Cover on page 73 Remove the chassis assembly from the back cover using the procedure Back Cover on page 81 Check that the coaxial connections to the back side of the channel 1 and channel 2 BNC connectors are intact Use the DMM to measure continuity from the BNC connector to the end of the coaxial cable where it attaches to the main board Check that the wire connections to the back side of the DMM and COM banana jacks are intact Use the DMM to measure continuity from the banana jacks to the end of the wire where it attaches to the main board If no problem is found and the trouble persists the main board is probably defective in some way that the internal diagnostics cannot detect Replace it THS710A THS720A THS730A amp THS720P Service Manual Maintenance Other Troubleshooting Use these techniques to troubleshoot other parts of the instrument Buttons Press each of the front panel buttons to verify that it operates properly The table below lists the buttons that depend on a particular instrument state for you to see an effect when the button is pressed Unless noted otherwise the instrument should be in scope mode for this test Button Precondition Expected Behavior HARD COPY None With no connection to the RS 232 port a message will appear approximately 10 sec
48. e Manual Examples Wavetek 9100 Universal Calibration System with Oscil loscope Calibration Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option Option 5500A SC Tektronix Deluxe Meter Lead Set ATLDX1 Tektronix part number 012 0482 00 Tektronix part number 011 0049 01 Tektronix part number 103 0090 00 27 Performance Verification Test Record Serial Number Procedure Performed by Date Test Feed Oscilloscope Tests High Limit Channel 1 DC Measure jmVdv 89465mV fs 35 95 mV Channel 2 DC Measure 5 i8346mV 35 95 mV Channel 1 Bandwidth amv Channel 2 Bandwidth amv fe Sample Rate and Delay Time Accuracy advs 4 divs Channel 1 Edge Trigger Sensitivity Stable trigger Channel 2 Edge Trigger Sensitivity Stable trigger 28 THS710A THS720A THS730A amp THS720P Service Manual Performance Verification DMM Tests DC Voltage Accuracy AC Voltage Accuracy Resistance Accuracy THS710A THS720A THS730A amp THS720P Service Manual 400 mV range 60 mV input 400 mV range 360 mV input 4 V range 40 V range 400 V range 880 V range 400 mV range 4 V range 600 mV input 4 V range 3 6 V input 40 V range 400 V range 640 V range 400 range 4 KQ range 40 k 2 range 6 kQ input 40 k 2 range 36 KQ input 400 KQ range 4 MQ range 40 MQ range Test Result High Limit 59 2 mV 357 7 mV
49. e it THS710A THS720A THS730A amp THS720P Service Manual Maintenance Executing Diagnostics Follow these steps to troubleshoot using diagnostics 1 To execute the internal diagnostic tests remove all input signals from the instrument and then perform the following steps SCOPE UTILITY System Diag Loop Once Execute OK Run Test 2 A dialog box displays the result when the diagnostic tests completes If any test fails the main board is probably defective Replace it MILI UFIL 3 Ifall tests pass press the CLEAR MENU button to continue operation 4 You should be able to compensate the signal path of a functioning instru ment To execute Signal Path Compensation remove all input signals from the instrument and then perform the following steps SCOPE UTILITY System Cal Signal Path OK Compensate Signal Paths 5 IfSignal Path Compensation does not complete successfully perform the Factory Cal Scope adjustment on page 55 and then repeat step 4 6 Ifall tests pass press the CLEAR MENU button to continue operation 7 If trouble persists proceed to Input Connections THS710A THS720A THS730A amp THS720P Service Manual 97 Maintenance 98 Input Connections Follow these steps to troubleshoot the input connections only if the following condition is true the instrument appears to function normally in every way except you have determine
50. ead the marking m WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A a CAUTION WARNING Double Protective Ground Refer to Manual High Voltage Insulated Earth Terminal THS710A THS720A THS730A amp THS720P Service Manual SS a Service Safety Summary 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 Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present 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 THS710A THS720A THS730A amp THS720P Service Manual vii Service Safety Summary viii THS710A THS720A THS730A amp THS720P Service Manual Preface Related Manuals This is the Service Manual for the THS710A THS720A THS730A and THS720P TekScope instruments This manual provides information to trouble shoot and repair the instrument to the module level Additional document
51. edure at any step Before performing adjustment procedures you must warm up the instrument at least ten minutes in an ambient temperature between 20 C and 30 C Adjust ments performed prior to warm up or outside this temperature range may result in poor performance In this manual TekScope instrument setups are shown in tables Refer to Conventions on page x for information about how to use these tables THS710A THS720A THS730A amp THS720P Service Manual Adjustment Procedures Accessing the Adjustment Lockout Jumper A Before adjusting the instrument you must temporarily remove the internal adjustment lockout jumper You will need a 12 in Ib 1 3 N m torque limiting screwdriver with Torx T 15 tip and a pair of needle nose pliers to access and remove the jumper WARNING 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 Also to prevent possible injury to service personnel or damage to electrical components read Preventing ESD on page 63 Use this procedure to access and remove the adjustment lockout jumper 1 Disconnect all probes cables or meter leads from the instrument 2 Disconnect the AC adapter open the battery door and remove the battery 3 Place the TekScope instrument face down on a soft surface such as an anti static mat 4 Use the torque limiting Torx T 15 screwdriver to remo
52. een or orange when viewed straight on THS710A THS720A THS730A amp THS720P Service Manual Maintenance m Displayed information is interrupted by static horizontal or vertical lines or stripes 3 If after a short wait you can see that the display operates normally but the display backlight does not turn on then skip to Backlight on page 94 4 Ifthe instrument does not appear to turn on no display backlight no sound of relay clicks no displayed information then continue with step 5 5 Disconnect the AC adapter from the instrument Remove the front cover using the procedure Front Cover on page 73 6 Reinstall the battery removed in the Front Cover procedure 7 Verify that the battery connector is properly connected See Figure 27 CAUTION To avoid damage to the battery or battery contacts be careful not to short the conductors at the battery connector Test here Figure 27 Battery connector location THS710A THS720A THS730A amp THS720P Service Manual 91 Maintenance 8 With the AC adapter still disconnected use a DMM to measure the DC voltage at the battery connector Follow the instructions in the table below Voltage Measurement at Battery Connector Instructions Approximately 0 Vpc Check that the battery is installed correctly Remove the battery and measure its voltage You should measure an open circuit voltage gt 4 8 Vpc across a fully charged battery If the battery is char
53. er the instrument Use 14 inch flat bladed screwdriver to lift the lower edge of the chassis assembly out of the back cover until you access the edge of the main board Remove the inverter input cable from the main board Measure the DC voltage on pins 1 and 2 of the connector on the main board If the measured voltage is approximately 12 Vpc the inverter input cable is defective Replace it If the measured voltage is approximately 0 Vpc the main board is probably defective Replace it Approximately 12 Vpc Proceed with step 4 4 Using an oscilloscope and 10X probe attach the probe ground lead to the ground terminal on the right side of the instrument Set the oscilloscope time base to 1 ms div and vertical sensitivity to 1 V div NOTE The inverter output voltage is approximately a 250 Vrms 40 kHz sine wave Capacitive coupling to the oscilloscope probe tip is sufficient to determine if the inverter output voltage is present 94 THS710A THS720A THS730A amp THS720P Service Manual Maintenance 5 Oscilloscope Display No signal displayed Approximately 40 kHz sinewave dis played Hold the probe tip above the output connector of the inverter board Do not touch the probe tip to either of the conductors in the connector Follow the instructions in the table below Instructions The inverter board is probably defective Replace it The display module is probably defective Replace it Displa
54. erformance Verification 3 Set the leveled sine wave generator frequency to 200 MHz if you are checking a THS730A or to 100 MHz if you are checking a THS710A THS720A or THS720P 4 Set the TekScope instrument VOLTS DIV to 500 mV div 5 Set the leveled sine wave generator output level to approximately 50 mVp p so that the measured amplitude is approximately 500 mV The measured amplitude can fluctuate around 500 mV 6 Press SET LEVEL TO 50 Adjust TRIGGER LEVEL as necessary and then check that triggering is stable 7 Change the TekScope instrument setup using the following steps I SCOPE TRIGGER falling edge 8 Press SET LEVEL TO 50 Adjust TRIGGER LEVEL as necessary and then check that triggering is stable MILINUFI THS710A THS720A THS730A amp THS720P Service Manual 43 44 Performance Verification Check Meter DC Voltage This test checks the meter DC voltage accuracy Accurac y 1 Set the DC voltage source output level to 0 V 2 Setup the TekScope instrument using the following steps METER MILUNUFI 3 Connect the TekScope instrument to the DC voltage source as shown below DC voltage Source THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 4 For each range set the DC voltage source output to the level listed below and then compare the meter reading to the accuracy limits DC Volt
55. es 16 Total harmonic distortion relative to the fundamental amplitude THD F ALE ms o s A V 4 Total harmonic distortion relative to the RMS amplitude THD R aus Vf op fs AP RMS Aus 4 0 2 of reading THS720P w 1 Sv x A measured over an integral number of cycles that contain n sample points VA Vgys X Arus VAR W 4 at the BNCs not including probe uncertainty Specifications Table 1 Oscilloscope specifications Cont Power Measurements THS720P PF Measurement true power apparent power VA Power factor PF Measurement is the phase difference between the fundamental components of voltage and current Positive angle means voltage leads current Negative angle means voltage lags current DPF Measurement Displacement power factor DPF cos Power Factor Mea 0 05 surements Accuracy With P6117 Probe Analog Bandwidth THS710A THS720A THS720P THS730A DC Coupled 100 MHz 100 MHz 200 MHz 90 MHz above 90 MHz above 180 MHz 35 C 35 C above 35 C Probe Attenuation 10X Maximum Voltage Overvoltage Category Maximum Voltage Between Probe Tip CAT II Environment refer to 300 Vnus and Reference Lead page 13 CAT III Environment refer to 150 Vnus page 13 For steady state sinusoidal waveforms derate at 20 dB decade above 900 kHz to 13 Vy at 27 MHz and above Also refer to Overvolta
56. esistance This test checks the meter resistance measurement accuracy Accurac y 1 Setup the TekScope instrument using the following steps METER MILI UFI 2 Connect the TekScope instrument to the resistance standard as shown below Resistance standard Banana cables 48 THS710A THS720A THS730A amp THS720P Service Manual Performance Verification 3 For each range set the resistance standard to the resistance listed below and then compare the meter reading to the accuracy limits Range 400 4 KQ 40 kQ 40 kQ 400 kQ 4 MQ 40 MQ Resistance Standard Setting 360 Q 3 6 6 kQ 36 360 3 6 MQ 36 MQ Accuracy Limits 358 0 Q to 362 0 3 580 KQ to 3 620 KQ 5 95 to 6 05 35 80 to 36 20 358 0 KQ to 362 0 3 580 MQ to 3 620 MQ 35 23 MQ to 36 77 MQ These limits apply only when the relative humidity is 60 This completes the performance verification procedure THS710A THS720A THS730A amp THS720P Service Manual 49 Performance Verification 50 THS710A THS720A THS730A amp THS720P Service Manual SSS Adjustment Procedures Required Equipment This chapter contains adjustment procedures for the TekScope instrument Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Also refe
57. following steps 1 Disconnect any probes or cables from the channel 1 and channel 2 input BNC connectors 2 Execute the signal path compensation with the following steps METER SCOPE UTILITY System Signal Path OK Compensate Signal Paths 3 When the signal path compensation is complete press CLEAR MENU to resume operation of the TekScope instrument THS710A THS720A THS730A amp THS720P Service Manual Performance Verification Execute Self Test This procedure uses internal routines to verify that the TekScope instrument functions and passes its internal self tests No test equipment or hookups are required Start the self test with the following setup METER SCOPE UTILITY System Diag Loop Once Execute E OK Run Test A dialog box displays the result when the self test completes Press the CLEAR MENU button to continue operation THS710A THS720A THS730A amp THS720P Service Manual 31 Performance Verification Check Oscilloscope DC Measurement Accuracy 32 This test checks the DC measurement accuracy of the oscilloscope 1 Set the DC voltage source output level to 0 V 2 Set up the TekScope instrument using the following steps Nn ru SAVE Recall Saved Recall Factory RECALL Setup Setup OK Recall Factory VERTICAL Probe Type Voltage Probe Set to 1X MENU OK Select Measrmnt
58. for the functions you use most often and menus to access the more specialized functions Using Scope Mode Press the front panel SCOPE button to enter scope mode Then press AUTO RANGE to set the vertical horizontal and trigger automatically for a usable display A typical scope mode display is shown in Figure 3 Status line Tek Run SOOMS s Sample G2 0 000 voc cd width 204 8ns Graticule EE queer 1iPk Pk Measurement JE M gy c Pes 580mv area readout area Gi 2 0mv che 1v 5 0ns chi 460m Waveform readout lines Figure 3 Typical scope mode display THS710A THS720A THS730A amp THS720P Service Manual 17 Operator Information Using Meter Mode Press the front panel METER button to enter meter mode Press one of the bezel buttons to choose a meter function and then press AUTORANGE to set the range automatically A typical meter mode display is shown in Figure 4 Status line Measurement readout areas 4 Zoom Off Graticule area Figure 4 Typical meter mode display 18 THS710A THS720A THS730A amp THS720P Service Manual Operator Information Using the Menu System use the menu system follow the steps below 1 Press a front panel button to display the menu you want to use MENUS HARMONICS E HORIZONTAL EE TRIGGER e 2 Press bezel button to choose
59. ge Category description on page 13 Maximum Voltage 30 Vnys 42 4 Vpk Between Reference Lead and Earth Ground Using P6117 Probe Maximum Voltage 30 Vnys 42 4 Vpk Channel to Channel Reference Leads Using P6117 Probe THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 1 Oscilloscope specifications Cont THS720A THS720P THS730A With P5102 Probe Analog Bandwidth DC Coupled Probe Attenuation Maximum Voltage Between Probe Tip and Reference Lead DC Coupled Maximum Voltage Between Probe Tip and Reference Lead AC Coupled Maximum Voltage Between Reference Lead and Earth Ground 90 MHz above 35 C THS710A 60 MHz 100 MHz 10X Overvoltage Category CAT II Environment refer to page 13 CAT III Environment refer to page 13 Overvoltage Category CAT II Environment CAT IIl Environment Overvoltage Category CAT II Environment CAT III Environment THS710A THS720A THS730A amp THS720P Service Manual 100 MHz 100 MHz 90 MHz above 35 C Maximum Voltage 1000 Vnus 600 Vnus Maximum Voltage 1000 Vpc 600 Vpc Maximum Voltage 600 Vams 300 Vams Specifications Table 2 DMM specifications General Resolution Input Resistance AC or DC Voltage Input Capacitance AC or DC Voltage typical Maximum Voltage Between DMM and COM Inputs Maximum Voltage Between DMM or COM Input and Earth Ground DC Voltage Ranges and Resol
60. ged the battery contacts inside the back cover are probably defective Replace the back cover assembly Greater than 0 Vpc but less than 4 Remove the battery and measure its voltage The open circuit voltage across a good battery should measure gt 4 Vp even if not fully charged If it remains 4 the battery may be defective Replace it If the battery is fully charged open circuit voltage 24 8 but the voltage under load is 4 Vpc the main board is drawing excessive current Replace the main board Greater than 4 Vpc check both mating Remove the battery and then proceed with step 9 connectors 9 With the battery removed from the instrument reattach the AC adapter to the instrument Measure the DC voltage at the battery connector Follow the instructions in the table below Voltage Measurement at Battery Connector Instructions Less than 1 Vpc Check that the AC adapter is connected correctly Disconnect the AC adapter and measure its output voltage If the voltage is less than 12 Vpc the AC adapter is probably defective Replace it Greater than 1 Vpc Proceed with step 10 10 Reinstall the battery Leave the AC adapter connected to the instrument 11 Use a l4 inch flat bladed screwdriver to lift the lower edge of the chassis assembly out of the back cover just until the connector from the flex circuit assembly to the main board is accessible 92 THS710A THS720A THS730A amp THS720P
61. ges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Table of Contents General Safety Summary
62. gger Trigger Sensitivity Edge Trigger Type THS710A THS720A and THS720P Trigger Sensitivity Edge Trigger Type THS730A Captures 50 or greater amplitude of pulses 8 ns wide 20 ns wide at 500 ns div 2 for Sample or Average acquisition mode 0 4 x position x volts div 0 1 div x volts div Measurement Type Absolute voltage measurements Delta voltage between any two waveforms acquired under same setup Accuracy 2 x reading position x volts div 0 1 div x volts div x 296 x reading 0 05 div x volts div 2 x reading position x volts div 0 15 div x volts div 0 6 mV THS710A THS720A 5 S s to 5 S s to 250 MS s ina 500 MS s ina 1 25 2 5 5 1 25 2 5 5 sequence sequence 2500 samples for each channel THS710A THS720A 10 ns div to 5 ns div to 50 s div 50 s div THS720P THS730A 5 S s to 5 S s to 1 GS s 500 MS s ina 1 25 2 5 5 1 25 2 5 5 sequence sequence THS720P THS730A 5 ns div to 2 ns div to 50 s div 50 s div 200 ppm over any 1 ms time interval Zero to 50 s Coupling THS710A THS720A THS730A amp THS720P Service Manual Sensitivity 0 35 div from DC to 50 MHz increasing to 1 div at 100 MHz 90 MHz above 35 C Sensitivity 0 35 div from DC to 50 MHz increasing to 1 5 div at 200 MHz 180 MHz above 35 C Specifications Table 1 Oscilloscope specifications Cont Internal
63. ic sensitive modules only at a static free work station 4 Nothing capable of generating or holding a static charge should be allowed on the work station surface 5 Handle circuit boards by the edges when possible 6 Do not slide the modules over any surface 7 Avoid handling modules in areas that have a floor or work surface covering capable of generating a static charge Inspection and Cleaning 64 General Care A Inspection and Cleaning Procedures This section describes how to inspect for dirt and damage and how to clean the TekScope instrument Inspection and cleaning are done as preventive mainte nance Preventive maintenance when done regularly may prevent malfunctions and enhance reliability Preventive maintenance consists of visually inspecting and cleaning the TekScope instrument and using general care when operating it How often to do maintenance depends on the severity of the environment in which the instrument is used A proper time to perform preventive maintenance is just before adjustment of the instrument Protect the TekScope instrument from adverse weather conditions The instru ment is not waterproof Do not store or leave the instrument where the LCD display will be exposed to direct sunlight for long periods of time The front and back covers help keep dust out of the TekScope instrument and must be in place during normal operation CAUTION To avoid damage to the TekScope instrument d
64. ifications and Compliances Certifications Overvoltage Category EC Declaration of Conformity Listed UL3111 1 and CAN CSA C22 2 No 1010 1 92 complies with EN61010 1 A2 Category CAT III Examples A typical CAT IIl environment is the power distribution system within a building or factory These environments are somewhat protected from lightning strikes but susceptible to switching transients and other disturbances that may generate high voltage impulses CAT II A typical CAT II environment is the 120 240 V distribution system within a lab or office These environments are fairly well protected from external high voltage disturbances CAT I A typical CAT II environment is circuitry inside electrical or elec tronic equipment that is powered by a power supply or a battery Meets the intent of Directive 89 336 EEC for Electromagnetic Compatibility and Low Voltage Directive 73 23 ECC for Product Safety as ammended by 93 68 EEC Compliance was demonstrated to the following specifications as listed in the official Journal of the European Communities EN 55011 Class A Radiated and Conducted Emissions 3 EN 50081 1 Emissions EN 60555 2 Power Harmonics EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge IEC 801 3 RF Radiated IEC 801 4 Fast Transients IEC 801 5 Surge EN 61010 1 Safety 1 Tektronix supplied ferrite bead required on instrument end of RS 232 cable Performance criteria 5
65. l First remove the front cover and switch mat using the procedure on page 73 Next remove the chassis assembly using the procedure on page 81 Then use the following procedure to disassemble the chassis STOP If you are disassembling only for cleaning inspect the chassis assembly to determine whether further disassembly is required to perform internal cleaning If so then proceed 1 Remove the display module and inverter board using the procedure on page 78 2 With the switch flex circuit assembly folded toward you place the chassis assembly on a soft static free surface with the main board side facing up 3 To remove the main board and switch flex circuit assembly from the chassis follow these steps a Use the needle nose pliers to remove both coaxial connectors from the back side of the BNC connectors Be careful not to crush the cable b Use the inch flat bladed screwdriver to open the display cable connector on the main board and then disconnect the display cable Refer to Figure 19 on page 80 if necessary c Dress the battery cable outward to free it from obstructions d Following the sequence circled numbers shown in Figure 24 lift gently on the edges of the main board while releasing the board retaining snaps CAUTION To prevent damage to the flex circuit take care not to twist the flex circuit at its connection to the main board e When all six snaps are released lift the main board and s
66. l label CAUTION Removal of a front panel label will destroy it Do not remove it unless it is defective and needs to be replaced Removal Use this procedure to remove a defective front panel label 1 Use the sharp knife to pry up a corner of the label 2 Use the needle nose pliers to peel the label off Installation Use this procedure to install a new front panel label in either a new or the existing front cover 1 Peel the paper off the back side of the new label 2 Handling the label by its edges only align it with the recess in the front cover as shown in Figure 13 3 When properly aligned press the new label into place Front panel label Recess in the front cover Figure 13 Installing a new front panel label THS710A THS720A THS730A amp THS720P Service Manual Maintenance Front Cover You will need a torque limiting Torx T 15 screwdriver needle nose pliers and sharp knife to remove the front cover and other immediately accessible modules destroy both pieces If one or the other are defective both must be replaced i CAUTION Attempting to remove the display shield from the front cover will likely Removal Use this procedure to remove the front cover and access the handle Switch mat battery door and gasket 1 2 Disconnect all probes cables or meter leads from the instrument Disconnect the AC adapter open the battery door and remove the battery Place the TekSc
67. lot Trim the ending tail to 4 inch length with the sharp knife THS710A THS720A THS730A amp THS720P Service Manual 75 Maintenance Gasket material Trim tails to 1 inch Overlap gasket material Figure 16 Installing the gasket 5 Slip the handle into the guides of the back cover as shown in Figure 17 6 Place the front cover assembly onto the instrument Taking care not to pinch the handle align it into the guides in the front cover Align the buttons so they all protrude through the holes in the front cover 7 Holding the case together pick it up and place it front side down on a soft surface 76 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Fold end of handle over Figure 17 Installing the handle 77 THS710A THS720A THS730A amp THS720P Service Manual Maintenance 78 A Display Module A CAUTION To avoid cross threading or cutting new threads with the screws carefully follow the procedure in the next step 8 To install the four screws follow these steps a Place the screws into their holes in the back cover b Using the torque limiting Torx T 15 screwdriver slowly turn each screw backward counterclockwise until you feel the thread drop and then gently tighten the screw turn clockwise into the existing thread c When all four all screws are in hold a corner of the case together firmly to compress the gasket while tightening
68. ms Nonsinusoidal waveforms with crest factor up to 3 Resolution 0 1 mV 1mV 10 mV 100 mV 1V Maximum Error 2 of reading 5 counts 4 of reading 5 counts Rejects AC signals by 60 dB at DC 50 Hz and 60 Hz Range 400 0 4 000 40 00 400 0 4 000 40 00 Range All ranges except 40 MC2 40 MQ Range 400 0 4 000 40 00 400 0 4 000 MQ 40 00 MQ THS710A THS720A THS730A amp THS720P Service Manual Resolution 0 1 10 10 Q 100 Q 1kQ 10 kQ Maximum Error 0 5 of reading 2 counts 2 of reading 5 counts for lt 60 relative humidity Full Scale Bias Voltage 350 mV 200 mV 350 mV 350 mV 400 mV 1 10 V Specifications Table 2 DMM specifications Cont OjJResistance Open Circuit Voltage typical Continuity Check Indication An audible tone is generated when measured resistance is below 50 typical Open Circuit Voltage 4V typical Test Current typical 1 Diode Check Range Zero to 2 V measures forward voltage drop of semiconductor junction Voltage Accuracy 25 typical Open Circuit Voltage 4V typical Test Current typical Data Logger Horizontal Scale Range 30 s div to 24 hours div 4 minutes to 8 days full scale Vertical Zoom Range 2X 5X or 10X Table 3 General specifications Display Display Type 4 7 in 120 mm diagonal liquid crystal Display Resolutio
69. ms in this chapter THS710A THS720A THS730A amp THS720P Service Manual 107 Diagrams 108 THS710A THS720A THS730A amp THS720P Service Manual PES 2a Mechanical Parts List This section contains a list of the replaceable modules for the TekScope instrument Use this list to identify and order replacement parts Parts Ordering Information Part Number Revision Level 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 when ordering parts it is important to include the following information in your order Part number see Part Number Revision Level below 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 Change information if any is located at the rear of this manual Tektronix part numbers contain two digits that show the revision level of the part For most 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 A 670 7918 03 670 7918 XX When you order parts
70. n 320 horizontal by 240 vertical pixels Display Contrast Adjustable temperature compensated Backlight Intensity 35 cd m typical 10 THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 3 General specifications Cont RS 232 Interface Device Type Pinout DTE at RJ 45 connector Signal Pin Number at Pin Number at 9 pin Null RJ 45 Modem Adapter Connector RTS out k TXD out 6 RXD in 5 DTR out 6 CTS in 7 RTS out DSR in not used ae DCD in not used 1 Probe Compensator Output Output Voltage typical Frequency typical Power Source Battery Battery Life typical Low Battery Indica tion typical Battery Saver Battery Charging Time typical External Power Memory Retention typical Fuse 5 0 V into gt 1 MQ load 1 2 kHz Replaceable Ni Cd battery pack Approximately two hours of continuous use from a full charge Low battery message first appears approximately ten minutes before the instrument powers off automatically Standby Time out and Backlight Time out extend battery life Time out ranges from 1 minute to 15 minutes or off With TekScope instrument operat 9 hours ing With TekScope instrument turned off In external charger 9 hours 1 5 hours 12 VDC nominal center positive Operates with input from 10 VDC to 15 VDC The DC INPUT disconnects itself automatically if gt 15 VDC is applied If this occurs disco
71. n five ranges 495 ns to 10 s 600 Vams CAT II or 300 Vans CAT III refer to page 13 DC only 10 2 V or 2 V selectable 500 mVp p from DC to 1 MHz increasing to 1 Vp p at 5 MHz with signal centered at selected trigger level THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 1 Oscilloscope specifications Cont Measurements Cursors Automated Measurements Voltage and Current H Number of Harmonics Harmonics Amplitude Accuracy Harmonics Phase Accuracy THD F Measurement THD F Accuracy THD R Measurement THD R Accuracy Frequency Accuracy Power Measurements True Power Measurement Apparent Power Measurement Reactive Power Measurement Power Measurements Accuracy THS710A THS720A THS730A amp THS720P Service Manual Voltage difference between cursors AV Time difference between cursors AT Reciprocal of AT in Hertz 1 AT Phase difference between cursors ADegrees Amplitude Burst Width Cycle Mean Cycle RMS Fall Time Frequency High Low Max Mean Min Negative Duty Cycle Negative Overshoot Negative Width Pk Pk Period Positive Duty Cycle Positive Overshoot Positive Width Rise Time and RMS armonics THS720P First 31 harmonics of signal with fundamental frequency between 30 Hz and 450 Hz Accuracies below are stated as a percent of the fundamental amplitude and are valid only if peak to peak amplitude is 4 divisions and number of averag
72. nd markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Replace Batteries Properly Replace batteries only with the specified type and rating Recharge Batteries Properly Recharge batteries for the recommended charge cycle only Use Proper AC Adapter Use only the AC adapter specified for this product Do Not Operate Without Covers Do not operate this product with covers or panels removed Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere THS710A THS720A THS730A amp THS720P Service Manual General Safety Summary Terms in this Manual Symbols and Terms on the Product vi 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 These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you r
73. ndwidth 1 Setup the TekScope instrument using the following steps MILI UFIL SCOPE SAVE Recall Saved Recall Factory RECALL Setup Setup OK Recall Factory TRIGGER Coupling MEAS Gating amp High Low High Low Method Setup Select Measrmnt OK Select Measrmnt You may need to press Select Page to display this selection 2 Connect the TekScope instrument to the leveled sine wave generator as shown below Leveled Sine wave generator 50 2 feedthrough terminator Ch 1 Output BNC cable 34 THS710A THS720A THS730A amp THS720P Service Manual Performance Verification A ww RO 8 9 Set the TekScope instrument VOLTS DIV to 100 mV div Set the TekScope instrument SEC DIV to 10 us div Set the leveled sine wave generator frequency to 50 KHz Set the leveled sine wave generator output level so the peak to peak measurement is between 599 mV and 601 mV Set the leveled sine wave generator frequency to 200 MHz if you are checking a THS730A 100 MHz if you are checking a THS720A or a THS720P or 60 MHz if you are checking a THS710A Press MAG Set the TekScope instrument SEC DIV to 10 ns div 10 Check that the peak to peak measurement is 2425 mV 11 Press MAG 12 Proceed to the next test to check the channel 2 bandwidth THS710A THS720A THS730A amp THS720P Service Manual 35 Performance Verification
74. ng information List of Modules on page 67 describes where to locate a list of replaceable modules m Summary of Procedures on page 68 lists the procedures for removal and installation of modules m Tools Required on page 69 describes the tools needed to perform the procedures m Tilt Stand on page 70 begins a series of procedures that describe the removal and installation of modules Preparation Please read the following warning statement Then read the following general instructions before removing a module WARNING Only qualified personnel should perform service procedures Before N 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 Also to prevent possible injury to service personnel or damage to electrical components read Preventing ESD on page 63 1 Read the Summary of Procedures on page 68 to understand which procedure to use to access a given module Then read Tools Required on page 69 for a list of tools needed to remove and install modules in the TekScope instru ment 2 Ifyou are disassembling the TekScope instrument for cleaning refer to the Inspection and Cleaning procedure on page 64 for cleaning instructions List of Modules Mechanical Parts List chapter provides a list of all replaceable modules Any electrical or mechanical module assembly or part listed in the parts list is referred to as a mod
75. nnect the overvoltage and then reconnect to a voltage in the proper range All memory is retained indefinitely with battery removed and without external power applied This instrument has no user replaceable fuses THS710A THS720A THS730A amp THS720P Service Manual 11 Specifications 12 Table 3 General specifications Cont Environmental Temperature Humidity Altitude Random Vibration Drop Resistance typical Moisture Resistance Mechanical Size Weight Adjustment Interval Operating Nonoperating 40 C or below 41 C to 50 C Operating Nonoperating Operating Nonoperating 10 C to 50 C 20 C to 60 C lt 95 relative humidity lt 75 relative humudity 2 000 m 15 000 m 2 66 grms from 5 Hz to 500 Hz 10 minutes on each axis 3 48 grms from 5 Hz to 500 Hz 10 minutes on each axis Survives a 30 in 76 cm drop onto concrete with only cosmetic damage Meets IEC529 IP43 with DC input hole plug I O port hole plug and battery door installed Height Width Depth With battery installed With all standard accessories in soft carry case When packaged for domestic shipment The recommended adjustment interval is one year 8 53 in 217 mm 6 95 in 177 mm 2 00 in 50 8 mm 3 2 Ibs 1 5 kg 7 5 lbs 3 4 kg 9 0 Ibs 4 1 kg THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 3 General specifications Cont Cert
76. nt parts from Tektronix 3and4 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 7 Mfr Code This indicates the code of the actual manufacturer of the part 8 Mfr Part Number This indicates the actual manufacturer s or vendor s part number Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 Mfr Code to Manufacturer The table titled Manufacturers Cross Index shows codes names and addresses Cross Index of manufacturers or vendors of components listed in the parts list 110 THS710A THS720A THS730A amp THS720P Service Manual Mechanical Parts List Manufacturers Cross Index Mfr Code Manufacturer 0BL82 CRT SCIENTIFIC 0KB01 STAUFFER SUPPLY CO 1DM20 PARLEX CORP 22670 GM NAMEPLATE INC 53279 XENTEK INC 80009 TEKTRONIX INC 85471 BOYD CORP 8X345 NORTHWEST SPRING AND MFG INC TK1163 INC TK2469 UNITREK CORP TK2539 ROYAL CASE COMPANY INC Address 14746 RAYMER ST 810 SE SHERM
77. o not expose it to any sprays liquids or solvents Inspect and clean the TekScope instrument as often as operating conditions require The collection of dirt on internal components can cause them to overheat and breakdown Dirt acts as an insulating blanket preventing efficient heat dissipation Dirt also provides an electrical conduction path that could cause an instrument failure especially under high humidity conditions THS710A THS720A THS730A amp THS720P Service Manual Maintenance Inspection Exterior Inspect the outside of the TekScope instrument for damage wear and missing parts Instruments that appear to have been dropped or otherwise abused should be checked thoroughly to verify correct operation and performance Immediately repair defects that could cause personal injury or lead to further damage to the instrument Cleaning Procedure Exterior To clean the TekScope instrument exterior perform the following steps 1 Remove loose dust on the outside of the instrument with a lint free cloth Use care to avoid scratching the clear plastic display filter 2 Use a soft cloth or paper towel dampened with water to clean the instrument You can use a 75 isopropyl alcohol solution for more efficient cleaning CAUTION To avoid damage to the surface of the TekScope instrument do not use any abrasive or chemical cleaning agents Inspection Interior During normal use the TekScope instrument case se
78. onds after HARD COPY is pressed Any bezel button Press DISPLAY first Displays pop up menu CLEAR MENU Press DISPLAY first Removes menu SCOPE Press METER first Changes to scope mode Rocker Press CURSOR and then Cursor moves choose Function V Bars first TOGGLE Press CURSOR and then Changes active cursor choose Function V Bars first WAVEFORM OFF Press CH 1 first Removes waveform VERTICAL MENU Press CH 1 first Displays menu VOLTS DIV Press CH 1 first Changes sensitivity VERTICAL POSITION Press CH 1 first Repositions waveform TRIGGER LEVEL Press CH 1 first Changes trigger level SET LEVEL TO 50 Adjust TRIGGER LEVEL first Resets trigger level If any button fails to operate inspect and or clean the switch flex circuit assembly and the switch mat If cleaning does not solve the problem the switch flex circuit assembly switch mat or main board may be defective Use the procedure below to isolate the problem 1 Replace the switch flex circuit assembly and then retest the buttons If the problem persists proceed to step 2 2 Replace the switchmat and then retest the buttons If the problem persists proceed to step 3 3 Replace the main board THS710A THS720A THS730A amp THS720P Service Manual 99 Maintenance 100 PROBE COMP Output When the instrument is on the PROBE COMP output should generate a square wave approximately 5 V in amplitude at a 1 2 kHz frequency Use the oscilloscope and a 10X probe to probe this out
79. ope instrument face down on a soft surface such as an anti static mat Use the Torx T 15 screwdriver to remove the four screws that hold the case together Holding the case together pick it up and place it back side down on a soft surface As you lift the front cover off the instrument press the buttons as necessary to prevent the switch mat from coming off with the front cover To remove the handle slip it off its guides To remove the switch mat lift it off the switch flex circuit assembly Place it button side down on a clean surface CAUTION To avoid contamination of switch contacts do not touch the carbon contacts on the switch flex circuit assembly or on the back side of the switch mat 9 To remove the battery door use the needle nose pliers to slip the retaining tether off of the post inside the instrument case as shown in Figure 14 THS710A THS720A THS730A amp THS720P Service Manual 73 Maintenance 74 Figure 14 Removing the battery door NOTE In most cases the gasket does not have to be removed from the front cover for interior cleaning 10 To remove the gasket from the front cover use the needle nose priers to lift it out of the groove in the front cover starting with the accessible tail at the bottom of the front cover Installation Use this procedure to install the battery door switch mat handle gasket and front cover 1 Place the TekScope instrument back side do
80. otify the shipper Tektronix Inc is not responsible for damage caused during shipping If you have not already done so carefully remove the TekScope instrument and its accessories from the padded case and inspect them for damage Save the shipping carton for repacking or storage Use a corrugated cardboard shipping carton having a test strength of at least 275 pounds 125 kg and with an inside dimension at least six inches 15 25 cm greater than the instrument dimensions If the instrument is being shipped to a Tektronix Service Center enclose the following information m The owner s address Name and phone number of a contact person Type and serial number of the instrument m Reason for returning 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 TekScope instrument should be stored in a clean dry environment The following environmental characteristics apply for both shipping and storage instrument not operating m Temperature range 20 C to 460 C m Altitude To 15 000 m See the chapter Specifications for a complete listing of the environmental charactertistics THS710A THS720A THS730A amp THS720P Service Manual Options The TekScope instrument options provide AC adapters User Manuals and Refe
81. over some of its capacity by repeatedly charging and then completely discharging the battery several times If several charge discharge cycles do not improve the battery life it should be replaced 1 Install a fully charged battery and connect the AC adapter to the instrument 2 Turn the instrument on 3 Disconnect the AC adapter plug from the instrument If the instrument turns off then battery power is not working Go back to step 5 on page 91 to troubleshoot the problem 4 While the instrument is running reconnect the AC adapter and then remove the battery If the instrument turns off then external power is not working Disconnect the AC power adapter from the instrument and use a DMM to measure its DC output voltage Follow the instructions in the table below AC Adapter Voltage Measurement Instructions Less than 12 Vpc The AC adapter is probably defective Replace it Greater than 12 Vpc The main board is probably defective Replace it THS710A THS720A THS730A amp THS720P Service Manual 101 Maintenance Unpacking and Repacking Instructions 102 Unpacking Repacking Storage This section contains the information needed to unpack the TekScope instrument and repack it for shipment or storage The TekScope instrument and its standard accessories are carefully packed at the factory in a padded case which is enclosed in a shipping carton If upon receipt damage to the shipping carton is evident n
82. put If the signal is not present the main board is probably defective Replace it RS 232 Port Verify that the RS 232 port operates properly The easiest way to test the port is to make a hard copy with a compatible printer and RS 232 cable To prepare to make a hard copy verify the following statements The printer is compatible with one of the supported formats Deskjet DPU 411 II DPU 412 Epson 9 pin Epson 24 pin Laserjet or Thinkjet The printer is equipped with a serial RS 232 port The printer is connected to the instrument through a known good RS 232 cable and adapter if needed m The printer is powered on and paper is loaded m The printer baud rate setting is known Set up the instrument and start the hard copy with the following steps UTILITY RS 232 Set RS232 Param eters To Defaults Baud rate Set baud rate to maich printer baud rate Format Choose format to match printer OK Select Format 1 You may need to press Select Page to display additional printer formats If the RS 232 port is defective replace the main board THS710A THS720A THS730A amp THS720P Service Manual Maintenance Battery and External Power Verify the battery and external power with the following procedure NOTE If the instrument runs normally under battery power but only for a short time the battery may have lost its capacity to hold a charge You may be able to rec
83. r to the chapter Operating Information for information about using the TekScope instrument NOTE The voltage references inside the TekScope instrument are very stable over time and should not require routine adjustment Before performing any proce dure in this chapter first verify that the instrument does not meet specifications Refer to the chapter Performance Verification for procedures to verify the specifications The following equipment or a suitable equivalent is required to complete these procedures Description DC Voltage Source AC Voltage Source Resistance Standard Fast Rise Square Wave Generator Banana to Banana Cable two required 50 BNC Cable 50 Q BNC Cable Minimum Requirements 400 mV to 800 V 0 196 accuracy 400 mV to 600 V 0 595 accuracy at 500 Hz 100 to 10 MQ 0 1 accuracy 300 mV step lt 20 ns risetime 0 596 flattness from 500 ns to 200 us 500 Hz or 950 Hz nominal 5096 duty cycle Shielded banana jacks on each end BNC male to BNC male 96 in 1 m long BNC male to BNC male 10 in 25 cm long THS710A THS720A THS730A amp THS720P Service Manual Examples Wavetek 9100 Universal Calibration System with Oscil loscope Calibration Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option Option 5500A SC Tektronix Deluxe Meter Lead Set ATLDX1 Tektronix part number 012 0482 00 Tektronix pa
84. rence Manuals for international customers Table 8 describes these options Table 8 TekScope instrument options Option Al A2 A6 L1 L2 L3 L4 L5 L6 Description Universal European AC adapter 220 V United Kingdom AC adapter 240 V Japan AC adapter 100 V French language User and Reference Manuals Italian language User and Reference Manuals German anguage User and Reference Manuals Spanish language User and Reference Manuals Japanese language User Manual English language Reference Portuguese language User and Reference Manuals Simple Chinese language User and Reference Manuals Standard Chinese language User and Reference Manuals Korean language User and Reference Manuals Russian language User Manual Includes THS7BAT and THS7CHG for European 220 V Includes THS7BAT and THS7CHG for United Kingdom 240V Includes THS7BAT and THS7CHG for North American 120V THS710A THS720A THS730A amp THS720P Service Manual 103 Options 104 THS710A THS720A THS730A amp THS720P Service Manual Seay Sane Electrical Parts List Refer to the Mechanical Parts List chapter for a complete listing and description of replaceable parts for the TekScope instrument THS710A THS720A THS730A amp THS720P Service Manual 105 Electrical Parts List 106 THS710A THS720A THS730A amp THS720P Service Manual a es Diagrams See Figure 6 on page 26 for a block interconnect diagram of the TekScope instrument There are no additional diagra
85. rt circuit board tabs into chassis holes Route battery cable into slot in chassis not shown Figure 26 Reassembling the chassis 7 To install the display cable follow these steps a Use the inch flat bladed screwdriver to open the connector on the main board b With the conductive contacts facing away from the main board insert the display cable into its connector c Use the 1 inch flat bladed screwdriver to close the connector and then check that the display cable is fully inserted into the connector d Dress the display cable down through the slot in the chassis 8 Turn the chassis assembly over so that the main board is facing down 9 Install the display module and inverter board using steps 1 through 9 of the procedure on page 80 10 Install the chassis assembly into the back cover using steps 1 and 2 of the procedure on page 82 11 Install the switch mat and front cover using the procedure on page 74 12 If detached install the tilt stand using the procedure on page 71 This completes the reassembly of the instrument THS710A THS720A THS730A amp THS720P Service Manual 89 Maintenance Troubleshooting 90 A Adjustment After Repair Required Tools and Equipment Begin Here This section contains information and procedures to help you isolate a defective module in the TekScope instrument WARNING Before doing this or any other procedure in this manual read the General Safety
86. rt number 012 0208 00 51 Adjustment Procedures Minimum Description Requirements Examples 50 lt Feedthrough BNC male and female con Tektronix part number Termination nectors 011 0049 01 Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number 103 0090 XX BNC T One male and two female Tektronix part number BNC connectors 103 0030 XX Overview of the Adjustment Process 52 The TekScope instrument is protected from inadvertent adjustment by an internal adjustment lockout jumper Some disassembly is required to access and remove the jumper before you can adjust the instrument After adjustment is complete the jumper should be replaced to protect the calibration of the instrument Oscilloscope adjustment and meter adjustment are independent procedures You can choose to adjust either or both Each procedure consists of a series of steps as you move through these steps the TekScope instrument display provides instructions that describe the specific input signal requirements for each step NOTE During some steps the instrument may appear to be idle for several minutes while it is processing information internally Please have patience If all steps in the procedure are completed successfully a Pass message is displayed and the new calibration constants take affect If any step fails the procedure is aborted and the current calibration is not affected You can also choose to abort the proc
87. step is described in the TekScope instrument display Refer to these diagrams as necessary during the procedure Table 4 summarizes the steps in the procedure and the signal requirement for each step Table 4 Summary of oscilloscope adjustment steps Step 1 NI oO Pp Uses Equipment Setup Signal Source Setting Square wave generator setup Fast rise output 300 mV amplitude 500 Hz or 950 Hz frequency Zero voltage setup None DC voltage setup 7 000 V DC voltage setup 7 000 V DC voltage setup 700 0 mV DC voltage setup 700 0 mV DC voltage setup 70 00 mV DC voltage setup 70 00 mV THS710A THS720A THS730A amp THS720P Service Manual 55 Adjustment Procedures 56 Square wave generator setup 10 inch BNC cable m 50 2 feedthrough Fast rise square BNG Tcconneeior Ch1 terminator wave generator Ch2 Output 36 inch BNC cable Zero voltage setup 10 inch BNC cable 50 lt feedthrough Ch1 terminator Bye Ch2 BNC T connector DC voltage setup 10 inch BNC cable DC voltage Source BNC T connector Dual banana to bnc adapter 36 inch BNC cable Figure 8 Oscilloscope adjustment setups THS710A THS720A THS730A amp THS720P Service Manual Adjustment Procedures Oscilloscope Adjustment After removing the adjustment lockout jumper
88. t information sales service and technical support n North America call 1 800 833 9200 m Worldwide visit www tektronix com to find contacts in your area Warranty 16 Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three 3 years from the date of original purchase from an authorized Tektronix distributor If the product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product Batteries are excluded from this warranty Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All replaced parts modules and products become the property of Tektronix In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix shipping charges prepaid and with a copy of customer proof of purchase Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping char
89. u do not have to remove the tilt stand to access internal modules In most cases you do not have to remove the tilt stand to clean the TekScope instrument exterior Removal Use this procedure to remove a defective tilt stand 1 Place the TekScope instrument face down on a soft surface such as an anti static mat 2 Insert the 4 inch flat bladed screwdriver into the gap between the tilt stand and instrument case as shown in Figure 11 3 Twist the screwdriver gently to release one side of the tilt stand from the instrument case Take care not to damage the case Figure 11 Removing the tilt stand 70 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Installation Use this procedure to install a new tilt stand 1 Orient the tilt stand to the back of the instrument case with the hinge pins toward the top and the side bump toward the handle 2 Insert one hinge pin into its socket and place the other into the cavity in the back of the instrument case as shown in Figure 12 3 Rotate the tilt stand to slide the second hinge pin upward and into its socket 1 Insert hinge pin into the socket de 2 Rotate the tilt stand to slide the second hinge pin into its socket C Figure 12 Installing the tilt stand THS710A THS720A THS730A amp THS720P Service Manual 71 Maintenance 72 Front Panel Label A You will need a sharp knife and needle nose pliers to remove a defective front pane
90. ule THS710A THS720A THS730A amp THS720P Service Manual 67 Maintenance Summary of Procedures Table 7 lists the removal and installation procedures in order of increasing complexity Table 7 Removal and installation procedures Procedure Modules Accessed Begins on Page Tilt Stand Tilt stand 70 Front Panel Label Front panel label 72 Front Cover Front cover 73 Display shield Switch mat Gasket Handle Battery door Screws Display Module Display module 78 Inverter board Back Cover DC power hole plug I O port hole plug Back cover back label battery contact assembly Complete Disassembly Chassis BNC connectors banana jacks Main board Switch flex circuit assembly Display cable Inverter board cable Foam pad set 2 Some pieces in the foam pad set are accessed by the Front Cover and Back Cover procedures 68 THS710A THS720A THS730A amp THS720P Service Manual Maintenance Tools Required You will need the following tools to remove and replace all the modules in the TekScope instrument Torque limiting screwdriver 12 in Ib 1 3 m range with Torx amp T 15 tip Screwdriver with 4 inch flat blade Screwdriver with 1 inch flat blade Needle nose pliers Sharp knife X ACTO knife or equivalent THS710A THS720A THS730A amp THS720P Service Manual 69 Maintenance Tilt Stand You will need a inch flat bladed screwdriver to remove the tilt stand STOP Yo
91. ution Accuracy Normal Mode Rejection typical Common Mode Rejection typical 3 digit 4000 count full scale reading except as noted 10 MQ 10 lt 100 pF Overvoltage Category CAT Environment refer to page 13 CAT II Environment refer to page 13 CAT III Environment refer to page 13 Overvoltage Category CAT Environment refer to page 13 CAT II Environment refer to page 13 CAT III Environment refer to page 13 Range 400 0 mV 4 000 V 40 00 V 400 0 V 880 V x 0 596 of reading 5 counts Maximum Voltage 640 Vnys 880 600 Vans 300 Vams Maximum Voltage 640 Vnys 880 600 Vams 300 Vams Resolution 0 1 mV 1mV 10 mV 100 mV 1V Rejects AC signals by 60 dB at 50 Hz or 60 Hz user selectable Rejects AC signals by 100 dB at 50 Hz or 60 Hz user selectable THS710A THS720A THS730A amp THS720P Service Manual Specifications Table 2 DMM specifications Cont AC Voltage Conversion Type Ranges and Resolution Accuracy 40 Hz to 500 Hz Common Mode Rejection typical OjJResistance Ranges and Resolution Accuracy Bias Voltage for Full Scale Resistance Measurement typical AC conversions are true RMS The AC measurement is based on the AC and DC components of the signal as shown below AC Measurement RMS AC DC DC Range 400 0 mV 4 000 V 40 00 V 400 0 V 640 V Input Waveform Sinusoidal wavefor
92. ve the four screws that hold the case together 5 Holding the case together pick it up and place it back side down on a soft surface 6 As you lift the front cover off the instrument press the buttons as necessary to prevent the switch mat from coming off with the front cover 7 To remove the switch mat lift it off the switch flex circuit assembly Place it button side down on a clean surface CAUTION To avoid contamination of switch contacts do not touch the carbon contacts on the switch flex circuit assembly or on the back side of the switch mat 8 Fold the switch flex circuit assembly toward you to expose the display module inverter board and adjustment lockout jumper The jumper location is shown in Figure 7 9 Use the needle nose pliers to remove the adjustment lockout jumper from the instrument Set the jumper aside for replacement after the adjustment is complete 10 To reassemble the instrument fold the switch flex circuit assembly back over the display module and inverter board THS710A THS720A THS730A amp THS720P Service Manual 53 Adjustment Procedures 54 LAU LAU Adjustment lockout 1 r Q Figure 7 Location of adjustment lockout jumper 11 To install the switch mat place it contact side
93. veforms MATH displays power measurements 15 SCOPE Selects scope mode 16 METER Selects meter mode Connecting and Using the Probes 22 The oscillscope probes and meter leads attach to the connectors located on the top and side panels of the TekScope instrument as shown in Figure 5 CH1 ISOLATED CHANNEL CH2 SCOPE INPUTS seme cnn A VOLTAGE RATING DC INPUT 12V 1A MAX e Top panel PROBE COMP th RUN IL RS 232 METER INPUTS SEE BACK OF INSTRUMENT FOR MAXIMUM VOLTAGE RATING Side panel Figure 5 Connector locations THS710A THS720A THS730A amp THS720P Service Manual Operator Information Compensating the Oscilloscope Probes To maintain signal fidelity you must compensate each voltage probe for the channel input it is connected to 1 Connect the oscilloscope probe and then press AUTORANGE Probe reference lead to 7 cec Probe tip to PROBE COMP AUTORANGE 2 Check the shape of the displayed waveform Overcompensated Undercompensated Compensated correctly 3 If necessary adjust the probe for correct compensation bw B s T gw P6117 P5102 4 Repeat these steps for the other probe and channel THS710A THS720A THS730A amp THS720P Service Manual 23 Operator Information 24 Attaching the Reference Leads Correctly Beware of High Voltages
94. witch flex cir cuit assembly out of the chassis enough to access the back side of the banana jacks f Use the needle nose pliers to remove both wires from the back side of the banana jacks Be careful not to deform the connectors attached to the wires g Complete the removal of the main board and switch flex circuit assembly and then place it on a soft static free surface with the two metal shields facing up THS710A THS720A THS730A amp THS720P Service Manual 85 Maintenance Unplug connectors Battery cable Ly I y Unplug connectors 2 Pd EM Display module cable Lift here Figure 24 Removing the main board and switch flex circuit assembly 4 To remove the switch flex circuit assembly from the main board follow these steps a With the main board laying flat from the previous step raise the switch flex circuit assembly to an upright position b While holding the flex circuit assembly upright use both thumbs and forefingers to grasp the left and right sides of the connector c Carefully alternate pulling on the left and right sides of the connector to work it out of its socket Do not pull one side out much farther than the other or bent pins may result 5 To remove the inverter board cable from the main board unplug it NOTE The BNC connectors and banana jacks are an integral part of the chassis If any of these connectors are defective the chassis must be replaced 86 T
95. wn on a soft surface such as an anti static mat 2 To install the battery door pass the retaining tether through the battery opening from the outside and then use the needle nose pliers to slip the retaining strap onto the post see Figure 14 3 To install the switch mat place it contact side down on the switch flex circuit assembly The five rubber guideposts fit into holes in the circuit board THS710A THS720A THS730A amp THS720P Service Manual Maintenance 4 Ifyou are installing a new front cover follow these steps to assemble it before installation Refer to Figure 15 a Install a new label using the procedure on page 72 b Install a new display shield into the inside of the new front cover Remove the backing paper from the adhesive on the display shield align it over the two diagonal posts and then press it into place The blue border should be even when viewed from the face of the front cover c Install new foam pad as shown in Figure 15 Display shield Foam pad Figure 15 Assembling a new front cover d Install a new gasket into the groove around the edge of the front cover As shown in Figure 16 start the gasket at the bottom of the cover leaving a short 14 inch tail through the slot Carefully press the gasket into place around the rim with the 1 inch flat bladed screwdriver To finish the installation overlap the starting point and then pass the end of the gasket through the remaining s
96. y Average Envelope N acquisitions one or two chan nels simultaneously N is settable from 2 to 256 or co DC AC or GND 1 MQ 1 in parallel with 25 pF 2 pF Overvoltage Category Maximum Voltage CAT II Environment refer to 300 Vnus page 13 CAT Environment refer to page 13 150 Vnus For steady state sinusoidal waveforms derate at 20 dB decade above 100 kHz to 13 Vp at 3 MHz and above Also refer to Overvoltage Category description on page 13 THS710A THS720A THS730A amp THS720P Service Manual 1 Specifications Table 1 Oscilloscope specifications Cont Inputs Maximum Voltage Between Common and Earth Ground at BNC Maximum Voltage Channel to Channel Commons Channel to Channel Common Mode Rejection typical Channel to Channel Crosstalk typical Common to Chassis Capacitance typical Vertical Number of Channels Digitizers VOLTS DIV Range Polarity Position Range Analog Bandwidth at BNC DC Coupled typical at 5 mV div guaranteed at all other settings Peak Detect or Enve lope Bandwidth typical 25 MS s or slower Analog Bandwidth Limit typical Lower Frequency Limit AC Coupled typical Rise Time at BNC typical 600 Vrms CAT II or 300 Vams CAT III using rated connectors or accessories 30 Vrms 42 4 using noninsulated connectors and acessories 30 Vnys 42 4 Vpy using noninsulated connectors and acessories 100 1 at frequencies
97. y Follow these steps to troubleshoot a nonfunctional display 1 2 Remove the front cover using the procedure Front Cover on page 73 Remove the display module and inverter board using the procedure Display Module on page 78 Fold the switch flex circuit board back over the instrument and reinstall the switch mat Connect the AC adapter to the instrument Turn the instrument on remove the switch mat and then fold the switch flex circuit assembly toward you to access display cable NOTE Without the display module installed the simplest way to verify that the instrument is on is to probe the PROBE COMP output with an oscilloscope If the instrument is on the PROBE COMP output generates approximately a 5 V 1 2 kHz squarewave 6 Use an oscilloscope and 10X probe to probe the contacts on the loose end of the display cable The table below describes the signals you should expect to see If some or all of the signals are not present then skip to step 9 Signal at Loose End of Display Cable Description Pin 1 closest to bottom of No signal might appear noisy instrument Pin 2 No signal might appear noisy Pin 3 Digital data high 5 V low 0 V Pin 4 Digital data high 5 V low 2 0 V Pin 5 Digital data high 5 V low 2 0 V Pin 6 Digital data high 5 V low 2 0 V THS710A THS720A THS730A amp THS720P Service Manual 95 Maintenance 96 Signal at Loose End of Display Cable Description Pin 7 10

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