Tektronix TekScope THS 700 Series Service Manual
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Tektronix TekScope THS 700 Series Service Manual

Tektronix TekScope THS 700 Series Service Manual

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Service Manual
THS 710 & THS 720
TekScopet
070-9246-03
This document applies to firmware version 1.00
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

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Summary of Contents for Tektronix TekScope THS 700 Series

  • Page 1 Service Manual THS 710 & THS 720 TekScopet 070-9246-03 This document applies to firmware version 1.00 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so.
  • Page 2 Copyright E Tektronix, Inc. 1995. All rights reserved. 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. Printed in the U.S.A.
  • Page 3 Tektronix, with shipping charges prepaid. 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.
  • Page 4 H Eliminates unexpected service expenses For Information and Ordering For more information or to order Service Assurance, contact your Tektronix representative and provide the information below. Service Assurance may not be available in locations outside the United States of America.
  • Page 5 Table of Contents General Safety Summary ........Service Safety Summary .
  • Page 6 Contents Options Options ........... 7–1 Electrical Parts List Electrical Parts List...

  • Page 7: Table Of Contents

    Contents List of Figures Figure 3–1: Module-level block diagram ..... . . 3–2 Figure 5–1: Location of adjustment-lockout jumper ....5–4 Figure 5–2: Oscilloscope adjustment setups .
  • Page 8 Contents List of Tables Table 1–1: Oscilloscope specifications ......1–1 Table 1–2: DMM specifications ....... 1–6 Table 1–3: General specifications .
  • Page 9 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. Injury Precautions Avoid Electric Overload To avoid injury or fire hazard, do not apply a voltage to any input, including the common inputs, that varies from ground by more than the maximum rating for that input.
  • Page 10 General Safety Summary Safety Terms and Symbols Terms in This Manual These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.
  • Page 11 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.
  • Page 12 Service Safety Summary viii THS 710 & THS 720 Service Manual...
  • Page 13 Preface This is the Service Manual for the THS 700 Series TekScope instruments. This manual provides information to troubleshoot and repair the instrument to the module level. Related Manuals Additional documentation for the instrument is contained in the related manuals listed below.
  • Page 14 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.

  • Page 16: Table 1-1: Oscilloscope Specifications

    Specifications This chapter contains the oscilloscope, DMM, and general specifications for the THS 710 and THS 720 TekScope instruments. All specifications are guaranteed unless noted “typical.” Specifications that are marked with the n symbol are checked in the chapter Performance Verification. All specifications apply to both the THS 710 and THS 720 unless noted otherwise.
  • Page 17 Specifications Table 1–1: Oscilloscope specifications (Cont.) Inputs Channel-to-Channel 100:1 at frequencies 50 MHz, measured on MATH Ch1 – Ch2 Common Mode waveform, with test signal applied between signal and common of both Rejection, typical channels, and with the same VOLTS/DIV and coupling settings on each channel Channel-to-Channel 100:1 at 50 MHz, measured on one channel, with test signal applied...
  • Page 18 Specifications Table 1–1: Oscilloscope specifications (Cont.) Vertical n DC Measurement Measurement Type Accuracy Acc r cy Aver e Accuracy, Average Average of 16 waveforms [2% |reading + Acquisition Mode (position volts/div)| + (0.1 div volts/div)] Delta volts between any two [2% |reading| + averages of 16 waveforms (0.05 div volts/div)]...
  • Page 19 Specifications Table 1–1: Oscilloscope specifications (Cont.) Trigger Width Tolerance 5%, 10%, 15%, or 20% Range, Pulse Trigger Type, typical Sensitivity, Video Composite video signal with negative sync pulse amplitude from 0.6 Trigger Type, typical to 2.5 divisions Signal Formats and Broadcast systems Supports NTSC, PAL, and Field Rates, Video...
  • Page 20 Specifications Table 1–1: Oscilloscope specifications (Cont.) With P5102 Probe Analog Bandwidth, THS 710 THS 720 DC Coupled o ple 60 MHz 100 MHz Probe Attenuation Maximum Voltage Overvoltage Category Maximum Voltage Between Probe Tip et ee Probe ip CAT II Environment 1000 V and Reference Lead, e ere ce e...

  • Page 21: Table 1-2: Dmm Specifications

    Specifications Table 1–2: DMM specifications General Resolution digit, 4000 count full scale reading except as noted Input Resistance, AC 10 MW 10% or DC Voltage Input Capacitance, 100 pF AC or DC Voltage, typical Maximum Voltage Overvoltage Category Maximum Voltage Between DMM and et ee D CAT II Environment...
  • Page 22 Specifications Table 1–2: DMM specifications (Cont.) AC Voltage n Accuracy Input Waveform Maximum Error Sinusoidal waveforms (2% of reading + 5 counts) Nonsinusoidal waveforms with (4% of reading + 5 counts) crest factor up to 3 Bandwidth, typical 5 kHz for all ranges Common Mode Rejects AC signals by >60 dB at DC, 50 Hz, and 60 Hz Rejection, typical...

  • Page 23: Table 1-3: General Specifications

    Specifications Table 1–2: DMM specifications (Cont.) Continuity Check An audible tone is generated when measured resistance is below 50 W, Indication typical Open Circuit Voltage, 4.8 V typical Test Current, typical 1 mA Diode Check Range Zero to 2 V, measures forward voltage drop of semiconductor junction Voltage Accuracy, typical Open Circuit Voltage,...
  • Page 24 Specifications Table 1–3: General specifications (Cont.) Probe Compensator Output Output Voltage, 5.0 V into 1 MW load typical Frequency, typical 1.2 kHz Power Source Battery Replaceable Ni-Cd battery pack Battery Life, typical Approximately two hours of continuous use from a full charge Low Battery Indica- Low battery message first appears approximately ten minutes before tion, typical...
  • Page 25 Specifications Table 1–3: General specifications (Cont.) Environmental Random Vibration Operating 2.66 g from 5 Hz to 500 Hz, 10 minutes on each axis Nonoperating 3.48 g from 5 Hz to 500 Hz, 10 minutes on each axis Drop Resistance, Survives a 30 in drop onto concrete with only cosmetic damage typical Mechanical Size...
  • Page 26 Fast Transients IEC 801–5 Surge EN 61010–1 Safety Tektronix-supplied ferrite bead required on instrument end of RS-232 cable Performance criteria: 5.0 div increase in peak to peak noise (Sample acquisition mode, full bandwidth); otherwise, 1.0 div increase in peak to peak noise...
  • Page 27 Specifications 1–12 THS 710 & THS 720 Service Manual...
  • Page 29 Operator Information This chapter provides a quick overview of the following topics: H Internal and external power sources H Understanding the front panel H Connecting and using the probes For more detailed information about TekScope instrument operation, refer to the THS 710 &...
  • Page 30 Operator Information Battery pack Using External Power For benchtop operation, you can use external power. Attach the AC adapter as shown below. 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.
  • Page 31 Operator Information Understanding the Front Panel The SCOPE and METER buttons select the operating mode. The front panel has additional buttons 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.
  • Page 32 Operator Information Using the Menu System To use the menu system, follow the steps below: 1. Press a front-panel button to display the menu you want to use. 2. Press a bezel button to choose a menu item. If a pop-up menu appears, continue to press the bezel button to choose an item in the pop-up menu.
  • Page 33 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. 4.
  • Page 34 Operator Information Using the Dedicated You can use the dedicated buttons below to take direct actions. These buttons do Buttons not require the use of menus. 1. HARD COPY. Initiates a hard copy using the RS-232 port. 2. HOLD. Stops/restarts oscilloscope acquisition or holds/resets meter readout. 3.
  • Page 35 Operator Information 15. SCOPE. Selects scope mode. 16. METER. Selects meter mode. Connecting and Using the Probes The oscillscope probes and meter leads attach to the connectors located on the top and side panels of the TekScope instrument. Top panel Side panel 2–7 THS 710 &...
  • Page 36 Operator Information Compensating the To maintain signal fidelity, you must compensate each voltage probe for the Oscilloscope Probes channel input it is connected to. 1. Connect the oscilloscope probe and then press AUTORANGE. Ch 1 Probe reference lead to Probe tip to PROBE COMP AUTORANGE 2.
  • Page 37 Operator Information Attaching the Reference If you are using both of the oscilloscope channels, you must attach the probe Leads Correctly 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.
  • Page 38 Operator Information 2–10 THS 710 & THS 720 Service Manual...
  • Page 40 Theory of Operation 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 3–1. Main Board The Main board assembly contains the following oscilloscope and meter functions.

  • Page 41: Figure 3-1: Module-Level Block Diagram

    Theory of Operation Display Module The display module consists of a liquid crystal display (LCD), a display driver, and 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.
  • Page 43 Time Mark Generator 10 ms period, 50 ppm accu- 5500A-SC) racy Banana to Banana Cable (two Shielded banana jacks on Tektronix Deluxe Meter Lead required) each end Set (012-1483-00) 50 W BNC Cable BNC male to BNC male, Tektronix part number...
  • Page 44 Performance Verification Test Record Serial Number Procedure Performed by Date Test Passed Failed Self Test Oscilloscope Tests Low Limit Test Result High Limit Channel 1 DC Measure- 5 mV/div 34.05 mV 35.95 mV me t Acc r cy ment Accuracy 500 mV/div 3.405 V 3.595 V...
  • Page 45 Performance Verification DMM Tests Low Limit Test Result High Limit DC Voltage Accuracy 400 mV range, 59.2 mV 60.8 mV 60 mV input 400 mV range, 357.7 mV 362.3 mV 360 mV input 4 V range 3.577 V 3.623 V 40 V range 35.77 V 36.23 V...
  • Page 46 Performance Verification Performance Verification Procedures 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: H The TekScope instrument must have been operating continuously for ten minutes within the operating temperature range specified.
  • Page 47 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: System Diag SCOPE UTILITY Loop...
  • Page 48 Performance Verification Check Oscilloscope DC This test checks the DC measurement accuracy of the oscilloscope. Measurement Accuracy 1. Set the DC voltage source output level to 0 V. 2. Set up the TekScope instrument using the following steps: Recall Saved Recall Factory SCOPE SAVE/...
  • Page 49 Performance Verification 4. For each VOLTS/DIV setting listed below, perform the following steps: a. Set the DC voltage source output level to the positive voltage listed and then record the mean measurement as V b. Reverse the polarity of the DC voltage source and then record the mean measurement as V c.
  • Page 50 Performance Verification Check Oscilloscope This test checks the bandwidth of channel 1. Channel 1 Bandwidth 1. Set up the TekScope instrument using the following steps: Recall Saved Recall Factory SCOPE SAVE/ — Setup Setup RECALL OK Recall — Factory ACQUIRE Mode Average Set to 16...
  • Page 51 Performance Verification 3. Set the TekScope instrument VOLTS/DIV to 100 mV/div. 4. Set the TekScope instrument SEC/DIV to 10 ms/div. 5. Set the leveled sine wave generator frequency to 50 kHz. 6. Set the leveled sine wave generator output level so the peak-to-peak measurement is between 599 mV and 601 mV.
  • Page 52 Performance Verification Check Oscilloscope This test checks the bandwidth of channel 2. Channel 2 Bandwidth 1. First check the channel 1 bandwidth using the previous test. Then, perform these additional steps to check the channel 2 bandwidth: CH 1 SCOPE —...
  • Page 53 Performance Verification 3. Set the TekScope instrument VOLTS/DIV to 100 mV/div. 4. Set the TekScope instrument SEC/DIV to 10 ms/div. 5. Set the leveled sine wave generator frequency to 50 kHz. 6. Set the leveled sine wave generator output level so the peak-to-peak measurement is between 599 mV and 601 mV.
  • Page 54 Performance Verification Check Oscilloscope This test checks the oscilloscope time base accuracy. Sample Rate and Delay 1. Set up the TekScope instrument using the following steps: Time Accuracy Recall Saved Recall Factory SCOPE SAVE/ — Setup Setup RECALL OK Recall —...
  • Page 55 Performance Verification 3. Set the time mark generator period to 10 ms. 4. Set the TekScope instrument VOLTS/DIV to 500 mV/div. 5. Set the TekScope instrument SEC/DIV to 2 ms/div. 6. Use the vertical POSITION rocker to center the test signal on screen. 7.
  • Page 56 Performance Verification Check Oscilloscope This test checks the edge trigger sensitivity for channel 1. Channel 1 Edge Trigger 1. Set up the TekScope instrument using the following steps: Sensitivity Recall Saved Recall Factory SCOPE SAVE/ — Setup Setup RECALL OK Recall —...
  • Page 57 Performance Verification 3. Set the leveled sine wave generator frequency to 100 MHz. 4. Set the TekScope instrument VOLTS/DIV to 500 mV/div. 5. Set the TekScope instrument SEC/DIV to 10 ns/div. 6. Set the leveled sine wave generator output level to approximately 50 mV so that the measured amplitude is approximately 500 mV.
  • Page 58 Performance Verification Check Oscilloscope This test checks the edge trigger sensitivity for channel 2. Channel 2 Edge Trigger 1. First check the channel 1 edge trigger sensitivity using the previous test. Sensitivity Then, perform these additional steps to check the channel 2 edge trigger sensitivity: CH 1 SCOPE...
  • Page 59 Performance Verification 3. Set the leveled sine wave generator frequency to 100 MHz. 4. Set the TekScope instrument VOLTS/DIV to 500 mV/div. 5. Set the TekScope instrument SEC/DIV to 10 ns/div. 6. Set the leveled sine wave generator output level to approximately 50 mV so that the measured amplitude is approximately 500 mV.
  • Page 60 Performance Verification Check Meter DC Voltage This test checks the meter DC voltage accuracy. Accuracy 1. Set the DC voltage source output level to 0 V. 2. Set up the TekScope instrument using the following steps: METER — — 3. Connect the TekScope instrument to the DC voltage source as shown below. DC voltage source –...
  • Page 61 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 Voltage Source Range Output Level Accuracy Limits 400 mV 60 mV 59.2 mV to 60.8 mV 400 mV 360 mV 357.7 mV to 362.3 mV...
  • Page 62 Performance Verification Check Meter AC Voltage This test checks the meter AC voltage accuracy. Accuracy 1. Set the AC voltage source output level to 0 V. 2. Set up the TekScope instrument using the following steps: METER — — 3. Connect the TekScope instrument to the AC voltage source as shown below. AC voltage source Banana cables...
  • Page 63 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 Accuracy Limits...
  • Page 64 Performance Verification 4–22 THS 710 & THS 720 Service Manual...
  • Page 66 5500A-SC) Fast-Rise Square Wave 300 mV step, 1 ns risetime Generator Banana to Banana Cable (two Shielded banana jacks on Tektronix Deluxe Meter Lead required) each end Set (012-1483-00) 50 W BNC Cable BNC male to BNC male, Tektronix part number...
  • Page 67 Adjustment Procedures Minimum Requirements Description Examples 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 The TekScope instrument is protected from inadvertent adjustment by an internal adjustment-lockout jumper.
  • Page 68 Adjustment Procedures Accessing the Adjustment-Lockout Jumper Before adjusting the instrument you must (temporarily) remove the internal adjustment-lockout jumper. You will need a 12 in lb (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.

  • Page 69: Figure 5-1: Location Of Adjustment-Lockout Jumper

    Adjustment Procedures Adjustment-lockout jumper Figure 5–1: Location of adjustment-lockout jumper 11. 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. 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.

  • Page 70: Table 5-1: Summary Of Oscilloscope Adjustment Steps

    Adjustment Procedures c. 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 lbs or 1.5 N m maximum torque).

  • Page 71: Figure 5-2: Oscilloscope Adjustment Setups

    Adjustment Procedures Square wave generator setup 10 inch BNC cable 50 W feedthrough BNC ‘T’ connector terminator Ch 1 Fast rise square wave generator Ch 2 Output 36 inch BNC cable Zero voltage setup 10 inch BNC cable 50 W feedthrough BNC ‘T’...
  • Page 72 Adjustment Procedures Oscilloscope Adjustment After removing the adjustment-lockout jumper, use this procedure to adjust the Procedure oscilloscope voltage references. 1. Turn on the TekScope instrument and let it warm up for at least ten minutes. 2. Connect the fast rise square wave generator to the instrument as shown in the Square wave generator setup of Figure 5–2.

  • Page 73: Table 5-2: Summary Of Meter Adjustment Steps

    Adjustment Procedures Meter Adjustment Three equipment setups, shown in Figure 5–3, 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.

  • Page 74: Figure 5-3: Meter Adjustment Setups

    Adjustment Procedures DC voltage setup DC voltage source – Banana cables AC voltage setup AC voltage source Banana cables Resistance standard setup Resistance standard Banana cables Figure 5–3: Meter adjustment setups 5–9 THS 710 & THS 720 Service Manual...
  • Page 75 Adjustment Procedures Meter Adjustment After removing the adjustment-lockout jumper, use this procedure to adjust the Procedure 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 5–3.

  • Page 76: Figure 5-4: Relocating The Adjustment-Lockout Jumper

    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 5–3. However, in place of step 9, reinstall the jumper onto pins 1 and 2 as shown in Figure 5–4.
  • Page 77 Adjustment Procedures 5–12 THS 710 & THS 720 Service Manual...
  • Page 79 Maintenance This chapter contains the information needed to do periodic and corrective maintenance on the TekScope instrument. The following sections are included: H Preparation refers you to important information contained elsewhere in this manual. H Preventing ESD provides general information on preventing damage to internal modules when doing maintenance.
  • Page 80 Maintenance 3. Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules. Do service of static-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.

  • Page 81: Table 6-1: Internal Inspection Check List

    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.
  • Page 82 Maintenance Table 6–1: 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. Firmly seat connectors. Repair or replace Burned, broken, or frayed modules with defective wires or cables.
  • Page 83 Maintenance Removal and Installation Procedures This section describes how to remove and install the major mechanical and electrical modules. It provides the following information: H List of Modules on page 6–5 describes where to locate a list of replaceable modules. H Summary of Procedures on page 6–6 lists the procedures for removal and installation of modules.

  • Page 84: Table 6-2: Removal And Installation Procedures

    Maintenance Summary of Procedures Table 6–2 lists the removal and installation procedures in order of increasing complexity. Table 6–2: Removal and installation procedures Procedure Modules Accessed Begins on Page Tilt Stand Tilt stand 6–8 Front-Panel Label Front-panel label 6–10 Front Cover Front cover 6–11 Display shield...
  • Page 85 Maintenance Tools Required You will need the following tools to remove and replace all the modules in the TekScope instrument. H Torque-limiting screwdriver, 12 in lb (1.3 N m) range with Torx T-15 tip H Screwdriver with inch flat blade H Screwdriver with inch flat blade H Needle-nose pliers...

  • Page 86: Figure 6-1: Removing The Tilt Stand

    Maintenance Tilt Stand You will need a inch flat-bladed screwdriver to remove the tilt stand. STOP. You 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.

  • Page 87: Figure 6-2: Installing The Tilt Stand

    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 6–2.

  • Page 88: Figure 6-3: Installing A New Front-Panel Label

    Maintenance Front-Panel Label You will need a sharp knife and needle-nose pliers to remove a defective front-panel 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.
  • Page 89 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. CAUTION. Attempting to remove the display shield from the front cover will likely destroy both pieces. If one or the other are defective, both must be replaced. Removal.

  • Page 90: Figure 6-4: Removing The Battery Door

    Maintenance Figure 6–4: 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.

  • Page 91: Figure 6-5: Assembling A New Front Cover

    Maintenance 4. If you are installing a new front cover, follow these steps to assemble it before installation. Refer to Figure 6–5. a. Install a new label using the procedure on page 6–10. 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.

  • Page 92: Figure 6-6: Installing The Gasket

    Maintenance Gasket material Front cover Trim tails to inch Overlap gasket material Figure 6–6: Installing the gasket 5. Slip the handle into the guides of the back cover as shown in Figure 6–7. 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.

  • Page 93: Figure 6-7: Installing The Handle

    Maintenance Velcro strip Fold end of handle over Figure 6–7: Installing the handle 6–15 THS 710 & THS 720 Service Manual...
  • Page 94 Maintenance 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.

  • Page 95: Figure 6-8: Removing The Display Module

    Maintenance Display module Display cable connector Inverter board Spring Switch flex-circuit board Figure 6–8: Removing the display module c. Using the inch flat-bladed screwdriver, carefully open the display- cable connector as shown in Figure 6–9. d. When the connector is open, slip the display cable out of the connector to free the display module.

  • Page 96: Figure 6-9: Opening The Display Cable Connector

    Maintenance Contact side of cable Figure 6–9: 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 6–8. 3.

  • Page 97: Figure 6-10: Routing Cables To The Inverter Board

    Maintenance Display module Inverter output connector Route cable through channels Inverter board Inverter input connector Route cable Route cable through channel under clip Figure 6–10: 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.

  • Page 98: Figure 6-11: Lifting The Chassis

    Maintenance 4. Carefully lift the bottom of the chassis 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 6–11: Lifting the chassis 5.

  • Page 99: Figure 6-12: Foam Pad And Hole Plug Locations On The Back Cover

    Maintenance Install DC power hole plug Install foam pads Install foam pad Install I/O port hole plug Install foam pad Install foam pads Figure 6–12: 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.

  • Page 100: Figure 6-13: Routing The Battery Wires

    Maintenance Retain connectors between pins Locate ferrite bead in cavity Dress wires from battery pack through slots Figure 6–13: Routing the battery wires 6–22 THS 710 & THS 720 Service Manual...
  • Page 101 Maintenance Complete Disassembly You will need a inch flat-bladed screwdriver and needle-nose pliers to remove modules mounted to the the chassis. Removal. First, remove the front cover and switch mat using the procedure on page 6–11. Next, remove the chassis assembly using the procedure on page 6–19.

  • Page 102: Figure 6-14: Removing The Main Board And Switch

    Maintenance Unplug connectors Battery cable Unplug connectors Display module cable Lift here Figure 6–14: 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.

  • Page 103: Figure 6-15: Foam Pad Locations On The Chassis

    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 6–15 for the locations of all the foam pads. Typical locating marks Align this foam pad with bottom edge of chassis...
  • Page 104 Maintenance 5. To prepare the main board and switch flex circuit board for installation into the chassis, follow these steps: a. Fold the switch flex-circuit assembly toward you. b. Dress the battery wires away from you. c. Dress the two coaxial cables that will connect to the BNC connectors to a position under the main board.

  • Page 105: Figure 6-16: Reassembling The Chassis

    Maintenance Insert circuit board tabs into chassis holes Route battery cable into slot in chassis (not shown) Figure 6–16: 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.
  • Page 106 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 Tektronix DMM200- or DMM300-series handheld multimeter inch flat-bladed screwdriver Hunter 30312...

  • Page 107: Figure 6-17: Battery Connector Location

    Maintenance H 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 6–32. 4.
  • Page 108 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 V Check that the battery is installed correctly. Remove the battery and measure its voltage.

  • Page 109: Figure 6-18: Bypassing The On/Stby Switch

    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 6–18. Follow the instructions in the table below. Instrument Behavior Instructions Instrument turns on Inspect and/or clean the switch flex-circuit assembly and the switch mat.
  • Page 110 Maintenance Backlight Follow these steps to troubleshoot a nonfunctional backlight. 1. Remove the front cover using the procedure Front Cover on page 6–11. 2. Turn the instrument on, remove the switch mat, and then fold the switch flex-circuit assembly toward you to access the inverter board. WARNING.
  • Page 111 Maintenance 5. 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. Oscilloscope Display Instructions No signal displayed The inverter board is probably defective.
  • Page 112 Maintenance Signal at Loose End of Display Cable Description Pin 8 0 V (ground) Pin 9 +5 V Pin 10 1.89 MHz clock (528 ns period), 50% duty cycle, appears in bursts, high = 5 V, low = 0 V 19.3 kHz clock (51.7 ms period), 16% duty Pin 11 cycle, high = 5 V, low = 0 V...
  • Page 113 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: System Diag SCOPE UTILITY Loop Once Execute — OK Run Test 2.
  • Page 114 Maintenance 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 determined that the channel 1, channel 2, or DMM signal is not getting into the instrument as expected.
  • Page 115 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.
  • Page 116 Maintenance 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 output. If the signal is not present, the main board is probably defective.
  • Page 117 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 recover some of its capacity by repeatedly charging and then completely discharging the battery several times.
  • Page 118 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: H The owner’s address...

  • Page 120: Table 7-1: Tekscope Instrument Options

    Options The TekScope instrument options provide AC adapters, User Manuals, and Reference Manuals for international customers. Table 7–1 describes these options. Table 7–1: TekScope instrument options Option 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...
  • Page 121 Options 7–2 THS 710 & THS 720 Service Manual...
  • Page 123 Electrical Parts List Refer to the Mechanical Parts List chapter for a complete listing and description of replaceable parts for the TekScope instrument. 8–1 THS 710 & THS 720 Service Manual...
  • Page 124 Electrical Parts List 8–2 THS 710 & THS 720 Service Manual...
  • Page 126 Diagrams See Figure 3–1 on page 3–2 for a block/interconnect diagram of the TekScope instrument. There are no additional diagrams in this chapter. 9–1 THS 710 & THS 720 Service Manual...
  • Page 127 Diagrams 9–2 THS 710 & THS 720 Service Manual...
  • Page 129 670-7918-03 670-7918-XX When you order parts, Tektronix will provide you with the most current part for your product type, serial number, and modification (if applicable). At the time of your order, Tektronix will determine the part number revision level needed for your product, based on the information you provide.
  • Page 130 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.
  • Page 131 GM NAMEPLATE, INC. 2040 15TH AVENUE WEST SEATTLE, WA 98119-2783 53279 XENTEK, INC 1770 LA COSTA MEADOW DR. SAN MARCOS, CA 92069 80009 TEKTRONIX, INC. P.O. BOX 500 BEAVERTON, OR, 97077-0001 85471 BOYD CORP. 6136 NE 87TH AVENUE PORTLAND, OR 97220 8X345 NORTHWEST SPRING AND MFG., INC.
  • Page 132 Mechanical Parts List Replaceable Parts List Fig. & Tektronix Part Serial No. Serial No. Mfr. Index Number Effective Discont’d Code Name & Description Mfr. Part Number Number 10–1 334-9005-00 B010100 LABEL: FRONT PANEL FOR THS 710 22670 334-9005-00 –1 334-8999-00...

  • Page 133: Figure 10-1: Exploded Diagram

    Mechanical Parts List Figure 10–1: Exploded diagram 10–5 THS 710 & THS 720 Service Manual...

  • Page 134: Table 10-1: Replaceable Standard Accessories

    Table 10–1 lists the replaceable standard accessories for the TekScope instru- ment and the instrument options that included them in the original shipment. These accessories are not shown in Figure 10–1. Table 10–1: Replaceable standard accessories Tektronix Part Number or Instrument Options That Nomenclature Include the Accessory...
  • Page 135 Mechanical Parts List Table 10–1: Replaceable standard accessories (Cont.) Tektronix Part Number or Instrument Options That Nomenclature Description of Accessory Include the Accessory 070-9275-XX Replacement Reference None Manual only (French) 070-9277-XX Replacement Reference None Manual only (Italian) 070-9276-XX Replacement Reference...
  • Page 136 Mechanical Parts List 10–8 THS 710 & THS 720 Service Manual...

This manual is also suitable for:

Tekscope ths 710Tekscope ths 720

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