Tektronix 784A - Manual

Tektronix 784A

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Table of Contents:

  • Page 3 – WARRANTY
  • Page 5 – Table of Contents; Specifications
  • Page 6 – ii; Adjustment Procedures; Removal and Installation Procedures
  • Page 7 – iii; List of Figures
  • Page 8 – iv
  • Page 11 – vii; List of Tables
  • Page 12 – viii
  • Page 13 – ix; General Safety Summary; Only qualified personnel should perform service procedures.; Injury Precautions
  • Page 14 – Safety Terms and Symbols; These terms may appear in this manual:
  • Page 15 – xi; The following symbols may appear on the product:; Certifications and Compliances; Symbols on the Product
  • Page 16 – xii
  • Page 17 – xiii; Service Safety Summary; To avoid electric shock, do not touch exposed connections.
  • Page 18 – xiv
  • Page 19 – xv; Preface; Manual Structure
  • Page 20 – xvi; Manual Conventions; STOP; Related Manuals; Modules
  • Page 21 – xvii
  • Page 22 – xviii
  • Page 23 – xix; Introduction; Service Strategy; Service Offerings; Warranty Repair Service
  • Page 24 – Self Service
  • Page 25 – xxi; Before You Begin; Be sure you are a qualified service person.
  • Page 26 – xxii
  • Page 28 – Product Description; Table 1–1: Key Features of the TDS 684A and 7XXA Oscilloscopes; Feature
  • Page 29 – User Interface; Menus
  • Page 30 – Horizontal System; Record Length
  • Page 31 – Trigger System; (flexible format) allows the user to define the video; Acquisition Control
  • Page 32 – On-Board User Assistance; Help
  • Page 33 – Storage; Measure
  • Page 34 – Display; Zoom
  • Page 36 – Nominal Traits; Table 1–3: Nominal Traits — Signal Acquisition System; Name
  • Page 37 – Table 1–4: Nominal Traits — Time Base System; Table 1–5: Nominal Traits — Triggering System
  • Page 38 – Table 1–6: Nominal Traits — Display System
  • Page 39 – Table 1–8: Nominal Traits — Data Handling and Reliability
  • Page 40 – Table 1–9: Nominal Traits — Mechanical
  • Page 42 – Warranted Characteristics; NOTE; Performance Conditions; C of the current ambient temperature.
  • Page 43 – Table 1–10: Warranted Characteristics — Signal Acquisition System
  • Page 44 – Table 1–11: Warranted Characteristics — Time Base System
  • Page 45 – Table 1–12: Warranted Characteristics — Triggering System
  • Page 46 – Table 1–14: Warranted Characteristics — Environmental
  • Page 48 – Typical Characteristics; Table 1–15: Typical Characteristics — Signal Acquisition System
  • Page 50 – Table 1–16: Typical Characteristics — Triggering System
  • Page 55 – Installation; Supplying Operating Power; Power Cord Information
  • Page 56 – Table 2–1: Power-Cord Conductor Identification; This oscilloscope operates with any line voltage from 90–250 VAC; with any; Operating Voltage
  • Page 57 – Operating Environment; C for the TDS 7XXA) with no diskette in the floppy drive.; Applying and Interrupting Power; Memory Backup Power
  • Page 58 – Table 2–3: Effects of Corrupted Data; Corrupted Data Type; Repackaging Instructions; Power Off
  • Page 59 – Installed Options
  • Page 61 – Operating Instructions; Screen Layout; The principal power switch at the rear panel is the true power; How to Power On
  • Page 62 – Figure 2–1: Map of Display Functions; How to Use Help
  • Page 63 – Locate the block that contains the function to be set.; How to Set Functions
  • Page 66 – b. Pushing the button that popped up the menu (17) toggles through the; How to Set Complex
  • Page 67 – a. Pushing some main-menu buttons displays a side menu with labels; As you’ve just seen, the general purpose
  • Page 69 – Display and Utility Menus.; Using the techniques described for using menus, you
  • Page 72 – Theory of Operation; This section has two main parts:; Logic Conventions; input termination is; General
  • Page 73 – Probe Coding Interface.; Tube Assembly
  • Page 74 – Front Panel
  • Page 77 – Performance Verification Procedures
  • Page 78 – Conventions
  • Page 79 – Figure 4–1: Map of Display Functions
  • Page 81 – Brief Procedures; Self Tests; Prerequisites; passing of internal diagnostics.; Verify Internal Adjustment,
  • Page 82 – Figure 4–2: Verifying Adjustments and Signal-Path Compensation
  • Page 83 – Functional Tests; The optional P6245 probes that can be used with this oscilloscope
  • Page 84 – Install the test hookup and preset the oscilloscope controls:; Press the main-menu button Recall Factory Setup.; Verify All Input Channels
  • Page 86 – Set the vertical SCALE to 200 mV.; Verify the Time Base
  • Page 87 – Verify the Main and
  • Page 88 – Press HORIZONTAL MENU.; b. Select the delayed trigger level menu:
  • Page 89 – Verify the File System
  • Page 91 – Performance Tests; The cabinet must be installed on the Digitizing Oscilloscope.
  • Page 92 – Equipment Required; Table 4–1: Test Equipment; Minimum Requirements
  • Page 93 – Purpose
  • Page 95 – TDS 684A Test Record; TDS 684A Performance Test
  • Page 99 – TDS 7XXA Test Record; TDS 7XXA Performance Test
  • Page 103 – Signal Acquisition System Checks; Be sure to disconnect any input signals from all four channels.; Check Offset Accuracy
  • Page 104 – Vertical position is set to 0 divisions and vertical offset to; Enter voltage on test record.
  • Page 105 – Figure 4–4: Measurement of DC Offset Accuracy at Zero Setting; Check DC Voltage
  • Page 106 – Install the test hookup and preset the instrument controls:; Figure 4–5: Initial Test Hookup; Modify the default settings:
  • Page 107 – Table 4–3: DC Accuracy
  • Page 108 – Check against limits:
  • Page 109 – Check Analog Bandwidth
  • Page 110 – Figure 4–7: Initial Test Hookup; Move the leveling head to the channel you selected.; button to toggle it to the 50
  • Page 111 – Table 4–4: Analog Bandwidth; Vertical Scale
  • Page 112 – Figure 4–8: Measurement of Analog Bandwidth
  • Page 113 – Check Delay Between
  • Page 114 – Figure 4–9: Initial Test Hookup
  • Page 115 – b. The horizontal SCALE should already be set to 500 ps. On the TDS; Display all test signals:; Press WAVEFORM OFF to remove CH 3 from the display.; Measure the test signal:
  • Page 116 – Figure 4–10: Measurement of Channel Delay – TDS 684A Shown; g. Check against limits: CHECK that the cursor readout on screen is
  • Page 117 – k. Again use the cursors to measure the skew from CH1 to CH2, CH1 to; n. Add the first CH1 to CH4 skew measurement to the second CH1 to CH4; skew measurement and divide the result by 2. Use Table 4–5.; Table 4–5: Delay Between Channels Worksheet; Coupling; the input connectors of the channels.
  • Page 118 – Time Base System Checks; Figure 4–11: Initial Test Hookup; Set the vertical SCALE to 500 mV.; Check Accuracy for
  • Page 119 – Set the horizontal SCALE of the Main time base to 1 ms.; Enter number of divisions on test record.
  • Page 120 – Figure 4–12: Measurement of Accuracy — Long-Term and Delay Time; Trigger System Checks; Pulse-Width Triggering
  • Page 121 – Figure 4–13: Initial Test Hookup; pulse-width triggering (Horizontal Scale
  • Page 123 – Set the horizontal SCALE to 5
  • Page 124 – Figure 4–15: Initial Test Hookup; Threshold, DC Coupled
  • Page 126 – Figure 4–16: Measurement of Trigger-Level Accuracy
  • Page 128 – to select the 50; DC Coupled
  • Page 129 – Figure 4–17: Initial Test Hookup; b. Check the Main trigger system for stable triggering at limits:
  • Page 132 – Set the horizontal SCALE to 500 ps for the M (Main) time base.; Display the test signal:
  • Page 133 – Output Signal Checks; Figure 4–19: Initial Test Hookup; Set the output of the calibration generator to 0.500 V.; panel to CH 2 through a 50; Initialize the oscilloscope:; Check Outputs — CH 3
  • Page 134 – Check Main Trigger output against limits:; Low readout is
  • Page 135 – Figure 4–20: Measurement of Main Trigger Out Limits
  • Page 136 – Check Probe
  • Page 137 – Figure 4–21: Initial Test Hookup; Modify the initialized front-panel control settings:
  • Page 138 – Figure 4–22: Measurement of Probe Compensator Frequency; Save the probe compensation signal in reference memory:
  • Page 139 – Figure 4–23: Subsequent Test Hookup; Measure amplitude of the probe compensation signal:
  • Page 140 – Figure 4–24: Measurement of Probe Compensator Amplitude; Enter voltage difference on test record.
  • Page 141 – Option 05 Video Trigger Checks; Press the side-menu OK Confirm Factory Init.; CONFIRM the digitizing oscilloscope is setup as shown below.; Check Video Trigger
  • Page 142 – Figure 4–25: Jitter Test Hookup; it displays the waveform on screen. See Figure 4–26.
  • Page 143 – Figure 4–26: Jitter Test Displayed Waveform – TDS 684A Shown
  • Page 144 – Figure 4–27: Jitter Test When Completed – TDS 684A Shown; Set up oscilloscope for Triggered Signal Test.
  • Page 146 – Figure 4–28: Triggered Signal Range Test – 300 mV
  • Page 147 – Figure 4–29: Triggered Signal Range Test – 75 mV; Connect the output of the SG 502 to the CH2 input through a 50
  • Page 148 – Figure 4–30: 60 Hz Rejection Test Hookup; Check 60 Hz rejection.
  • Page 149 – Figure 4–32: Subsequent 60 Hz Rejection Test Hookup; Disconnect all test equipment from the digitizing oscilloscope.
  • Page 150 – Figure 4–33: 60 Hz Rejection Test Result – TDS 684A Shown; cable and a 75
  • Page 151 – Figure 4–34: Line Count Accuracy Test Hookup
  • Page 152 – Figure 4–35: Line Count Accuracy Test Setup Waveform – TDS 684A Shown
  • Page 153 – Figure 4–36: Line Count Accuracy Correct Result Waveform
  • Page 155 – Figure 4–37: PG502 Setup for Sync Duty Cycle Test
  • Page 156 – Figure 4–38: Sync Duty Cycle Test: One-Div Neg Pulse Waveform
  • Page 157 – Figure 4–39: Sync Duty Cycle Test: Critically Adjusted Pulse
  • Page 160 – The Adjustment Procedures are divided into six subsections:; Requirements for Performance; This oscilloscope requires a 20 minute warm-up time in a 20; Description
  • Page 161 – Usage; System
  • Page 162 – Table 5–1: Calibration Tests; Class of Adjustment; Complete Adjustment
  • Page 163 – Table 5–2: Adjustments Required for Module Replaced; Module Replaced; Table 5–3: Adjustments and Dependencies; Adjustment After Repair
  • Page 165 – Requires a TM 500 or TM5000 Series Power Module Mainframe.
  • Page 166 – Adjustment Instructions; accompanying your GPIB card to install and configure that card.; Table 5–5: GPIB Board Configuration; Board Settings; Hardware Installation
  • Page 167 – b. The adjustment software will be installed in a directory called; Power on the oscilloscope.; d. Use the keypad to set any address between 0 and 29.; Adjustments
  • Page 168 – Figure 5–1: Accessing the Protection Switch
  • Page 169 – d. To do a complete adjustment as defined on page 5–3, you must also do; Probe Adjustment for the P6139A Probe; Compensate the Probe
  • Page 170 – Figure 5–2: Hookup for Probe Compensation; Press AUTOSET. Set the horizontal SCALE to 250
  • Page 171 – Figure 5–3: Performing Probe Compensation; Figure 5–4: Proper and Improper Probe Compensation
  • Page 172 – Figure 5–5: Exposing the Inner Probe Tip; Measure Probe Bandwidth
  • Page 173 – Figure 5–6: Initial Test Hookup
  • Page 174 – Adjust the Probe — High
  • Page 175 – Figure 5–7: Exposing the Probe Body; precision cable to the input of a tunnel diode pulser.
  • Page 176 – Figure 5–8: Initial Test Hookup
  • Page 177 – Make the adjustments:
  • Page 178 – Figure 5–9: Locations of P6139A Probe Adjustments
  • Page 179 – Figure 5–10: Adjustments versus Front-Corner Response
  • Page 180 – Display Assembly Adjustment; Procedures in Section 6 to remove the cabinet.; Contrast Adjustment
  • Page 181 – Figure 5–11: Five and Ten Percent Luminance Patches
  • Page 182 – a. Restore the dip switch to the settings that follow:
  • Page 185 – Maintenance; Related Maintenance Procedures
  • Page 186 – Preparation; Static discharge can damage any semiconductor component in this; Handle circuit boards by the edges when possible.; capable of generating a static charge.; Susceptibility to ESD.; Table 6–1 lists the relative susceptibility of various classes; Preventing ESD
  • Page 187 – Table 6–1: Relative Susceptibility to Static-Discharge Damage; Semiconductor Classes
  • Page 188 – Inspection and Cleaning; that; Inspection — Exterior.; Inspect the outside of the oscilloscope for damage, wear,; General Care
  • Page 189 – Table 6–2: External Inspection Check List; Item; Cleaning Procedure — Exterior.; To clean the oscilloscope exterior, do the following:; Inspection — Interior.; To access the inside of the oscilloscope for inspection and
  • Page 190 – Table 6–3: Internal Inspection Check List; Cleaning Procedure — Interior.; To clean the oscilloscope interior, do the following:
  • Page 193 – Preparation — Please Read; Before doing this or any other procedure in this manual, read the; List of Modules
  • Page 194 – General Instructions
  • Page 195 – Table 6–4: Tools Required for Module Removal
  • Page 196 – Figure 6–1: External Modules
  • Page 199 – Access Procedure; a. Find the module to be removed in the module locator diagrams,; found under Procedures for External Modules.
  • Page 200 – Procedures for External Modules; tweezers
  • Page 201 – Figure 6–4: Knob Removal; Line Fuse and Line Cord
  • Page 202 – Figure 6–5: Line Fuse and Line Cord Removal; See Rear Cover and Cabinet procedure on page 6–18.; a. Have handy a screwdriver with a size T-20 Torx; tip; EMI Gaskets
  • Page 205 – Figure 6–6: Rear Cover and Cabinet Removal
  • Page 206 – Attenuator Panel
  • Page 207 – a. Have handy a screwdriver with a size T-15 Torx; b. Locate the modules to be removed in the locator diagram External; A12 Front-Panel Assembly
  • Page 208 – Figure 6–8: A12 Front-Panel Assembly Removal; front-panel buttons are to be serviced, do the following substeps:
  • Page 209 – Figure 6–9: Disassembly of Front-Panel Assembly; Assemble equipment and locate modules to be removed: Have handy a; Display-Frame Assembly
  • Page 210 – Cabinet Modules
  • Page 212 – Figure 6–10: Cabinet Modules Removal
  • Page 213 – Procedures for Outer-Chassis Modules; Assemble equipment and locate module to be removed: Have handy a; Fan
  • Page 215 – a. Using a screwdriver with size T-15 Torx; tip, remove the two screws; Figure 6–12: Remove Circuit Board Assembly From Oscilloscope; inch nutdriver, remove the four lock connectors (number 3 in; A23 SerPar Board —
  • Page 216 – Figure 6–13: Remove Circuit Board From Assembly; power-up short diagnostics procedure described on page 6–57.; A29 Video Trigger Board
  • Page 217 – b. Slide back and lift up the Video Trigger circuit board (see Figure
  • Page 218 – Figure 6–14: Circuit Board Installed
  • Page 219 – Figure 6–15: Circuit Board Removal; of each step to reinstall the A29 Video Trigger Board.
  • Page 220 – procedure A29 Video Trigger Board.; A11 Processor/Display
  • Page 221 – Figure 6–16: A11 Processor/Display Removal; Assemble equipment and locate modules to be removed:; Top Cover and Board
  • Page 222 – Figure 6–17: Board Bracket Removal
  • Page 223 – b. Working from the rear panel and using the; inch nut driver, unscrew; b. Locate the modules to be removed, including those listed under; A10 Acquisition Board
  • Page 224 – d. Remove the five front-panel screws that attach the frame to the
  • Page 225 – Figure 6–18: A10 Acquisition Board Removal
  • Page 226 – a. Have handy a screwdriver with a small Phillips head.; surface and its front is facing you.; Floppy Disk
  • Page 227 – Figure 6–19: Floppy Disk Removal
  • Page 228 – Install the front cover if it’s not already installed.; b. Unplug the video cable at J51 of the processor/display board.; Rear Chassis
  • Page 229 – Figure 6–20: Rear Chassis Removal
  • Page 230 – Procedures for Inner-Chassis Modules; A16 Low Voltage Power Supply; a. Working from the rear of the oscilloscope, remove the two screws; If option 05 is installed, A29 Video Trigger Board (page 6–32); A16 Low Voltage Power
  • Page 231 – Figure 6–21: A16 Low Voltage Power Supply Removal; A30 Display Assembly
  • Page 233 – Figure 6–22: Display Assembly Removal; Remove the display supply board: Use Figure 6–23 as a guide.
  • Page 234 – Figure 6–23: Display Driver Board Removal; display tube if removed.
  • Page 235 – b. See the procedure A30 Display Assembly and Supply Fuse (page 6–47); Front Subpanel
  • Page 236 – Figure 6–24: Front Subpanel Removal; Main Chassis
  • Page 237 – Disassembly for Cleaning
  • Page 241 – Troubleshooting; Diagnostics; b. Repeatedly press the main-menu button System until Diag/Err is
  • Page 242 – Firmware Updates; Figure 6–25: Accessing the Protection Switch
  • Page 243 – Figure 6–26: Primary Troubleshooting Procedure
  • Page 245 – Figure 6–27: Module Isolation Troubleshooting Procedure
  • Page 247 – Figure 6–29: Power Supply Voltage Measurement Locations
  • Page 248 – Figure 6–30: Color Display Troubleshooting Procedure
  • Page 249 – Figure 6–31: Horizontal and Vertical Sync Signals – Color Display
  • Page 250 – Figure 6–33: Processor/Acquisition Troubleshooting Procedure
  • Page 251 – Figure 6–34: Processor/Front Panel Troubleshooting Procedure
  • Page 252 – Figure 6–35: Attenuator/Acquisition Troubleshooting Procedure
  • Page 256 – Figure 6–39: A10 Acquisition Module (View of Lower Right Corner)
  • Page 258 – Options and Accessories; Options; Tektronix will ship the options shown in Table 7–1:; Label
  • Page 260 – Standard Accessories; Table 7–2: Standard Accessories; Accessory
  • Page 261 – Optional Accessories; You can also order the optional accessories listed in Table 7–3.; Table 7–3: Optional Accessories; Provides 100X, when ordered with Option 25.; Accessory Probes
  • Page 262 – Table 7–4: Accessory Software; Software; Accessory Software
  • Page 265 – Electrical Parts List
  • Page 268 – Diagrams; Symbols
  • Page 269 – Figure 9–1: Interconnections
  • Page 271 – Figure 9–2: Block Diagram
  • Page 275 – Mechanical Parts List; Parts Ordering Information; Module Repair and Return.; Module Servicing
  • Page 276 – Using the Replaceable Parts List; Parts List Column Descriptions; Column; Abbreviations
  • Page 277 – Manufacturers Cross Index; Manufacturer
  • Page 278 – Address
  • Page 280 – Replaceable Parts List
  • Page 281 – Figure 10–1: External Modules
  • Page 289 – Figure 10–6: Floppy Disk
  • Page 290 – Figure 10–7: Accessories
Loading the manual

Service Manual

TDS 684A, TDS 744A, & TDS 784A
Digitizing Oscilloscope

070-8992-03

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 the Safety Summary prior to
performing service.

Please check for change information
at the rear of this manual.

Fourth Edition: January 1995

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Summary

Page 3 - WARRANTY

WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) yearsfrom the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, eitherwill repair the defective product without c...

Page 5 - Table of Contents; Specifications

TDS 684A, TDS 744A, & TDS 784A Service Manual i Table of Contents General Safety Summary ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xiii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xv . . . . . . . . . ....

Page 6 - ii; Adjustment Procedures; Removal and Installation Procedures

Table of Contents ii TDS 684A, TDS 744A, & TDS 784A Service Manual Performance Tests 4–15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites 4–15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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