Tektronix 684A, 744A, 784A

Troubleshooting

TDS 684A, TDS 744A, & TDS 784A Service Manual 6–69

CAUTION. Only probe points specified in the procedures. You can cause

catastrophic damage if you attempt to probe other points.

Contents

Main Page WARRANTY Page Table of Contents Specifications Operational Information Theory of Operation Performance Verification Adjustment Procedures Maintenance Removal and Installation Procedures 69. . . . . . . . . . . . . . . . . . . . . . . . . . Options Electrical Parts List Diagrams Mechanical Parts LIst List of Figures Page Page Page List of Tables Page General Safety Summary Injury Precautions Product Damage Precautions Safety Terms and Symbols Certifications and Compliances Page Service Safety Summary Page Preface Manual Structure Manual Conventions Related Manuals Modules Safety Symbols Page Page Introduction Service Strategy Service Offerings Warranty Repair Service Repair or Calibration Service Self Service Before You Begin Page Page Specifications Product Description User Interface Signal Acquisition System Menus Indicators General Purpose Knob GUI Horizontal System Trigger System Acquisition Control On-Board User Assistance Measurement Assistance Cursor Help Autoset Storage I/O Measure Digital Signal Processing (DSP) Display Zoom Page Nominal Traits 110 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 14: Nominal Traits Time Base System Table 15: Nominal Traits Triggering System TDS 684A, TDS 744A, & TDS 784A Service Manual 111 Table 15: Nominal Traits Triggering System (Cont.) TimeSetup/Hold Violation Trigger Table 16: Nominal Traits Display System 112 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 17: Nominal Traits GPIB Interface, Output Ports, and Power Fuse Table 18: Nominal Traits Data Handling and Reliability TDS 684A, TDS 744A, & TDS 784A Service Manual 113 Table 19: Nominal Traits Mechanical Page Warranted Characteristics Performance Conditions 116 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 110: Warranted Characteristics Signal Acquisition System TDS 684A, TDS 744A, & TDS 784A Service Manual 117 Table 110: Warranted Characteristics Signal Acquisition System (Cont.) Table 111: Warranted Characteristics Time Base System 118 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 112: Warranted Characteristics Triggering System Table 113: Warranted Characteristics Output Ports, Probe Compensator, and Power Requirements TDS 684A, TDS 744A, & TDS 784A Service Manual 119 Table 114: Warranted Characteristics Environmental 120 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 114: Warranted Characteristics Environmental (Cont.) TDS 684A, TDS 744A, & TDS 784A Service Manual 121 Typical Characteristics 122 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 115: Typical Characteristics Signal Acquisition System (Cont.) TDS 684A, TDS 744A, & TDS 784A Service Manual 123 Table 116: Typical Characteristics Triggering System 124 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 116: Typical Characteristics Triggering System (Cont.) Page Page Page Installation Supplying Operating Power Power Cord Information Operating Voltage Operating Environment Applying and Interrupting Power Power On Memory Backup Power Operating Temperature Repackaging Instructions Power Off Installed Options Page Operating Instructions Screen Layout How to Power On Basic Procedures How to Use Help How to Use the Status Menu How to Set Functions Page Page How to Set Complex Functions Page Page Page Page Page Theory of Operation Logic Conventions Module Overview General Input Signal Path Tube Assembly Front Panel Rear Panel Low Voltage Power Supply Fan Page Page Performance Verification Procedures Conventions Page Page Brief Procedures Self Tests Verify Internal Adjustment, Self Compensation, and Diagnostics Page Functional Tests Verify All Input Channels Page Verify the Time Base Verify the Main and Delayed Trigger Systems Page Verify the File System Page Performance Tests Prerequisites 416 TDS 684A, TDS 744A, & TDS 784A Service Manual Equipment Required TDS 684A, TDS 744A, & TDS 784A Service Manual 417 Table 41: Test Equipment (Cont.) Page TDS 684A, TDS 744A, & TDS 784A Service Manual 419 TDS 684A Test Record 420 TDS 684A, TDS 744A, & TDS 784A Service Manual TDS 684A Test Record (Cont.) TDS 684A, TDS 744A, & TDS 784A Service Manual 421 TDS 684A Test Record (Cont.) Page TDS 684A, TDS 744A, & TDS 784A Service Manual 423 TDS 7XXA Test Record 424 TDS 684A, TDS 744A, & TDS 784A Service Manual TDS 7XXA Test Record (Cont.) TDS 684A, TDS 744A, & TDS 784A Service Manual 425 TDS 7XXA Test Record (Cont.) Page Signal Acquisition System Checks Check Offset Accuracy (Zero Setting) Page Check DC Voltage Measurement Accuracy Page Page Page Check Analog Bandwidth Page Page Page Check Delay Between Channels Page Page Page Page Time Base System Checks Check Accuracy for Long-Term Sample Rate, Delay Time, and Delta Time Measurements Page Trigger System Checks Check Accuracy (Time) for Pulse-Glitch or Pulse-Width Triggering Page Page Page Check Accuracy, Trigger-Level or Threshold, DC Coupled Page Page Page Sensitivity, Edge Trigger, DC Coupled Page Page Page Page Output Signal Checks Check Outputs CH 3 Main and Delayed Trigger Page Page Check Probe Compensator Output Page Page Page Page Option 05 Video Trigger Checks Check Video Trigger Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Adjustment Procedures Requirements for Performance Usage System Optional Peripherals Test Equipment Performing the Adjustments Complete Adjustment Individual Adjustments Partial Adjustment Adjustment After Repair Adjustment Dependencies Adjustment Procedures TDS 684A, TDS 744A, & TDS 784A Service Manual 55 Equipment Required Adjustment Procedures 56 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 54: Test Equipment, Fixtures, and Supplies (Cont.) Adjustment Instructions Hardware Installation Software Installation Software-Based Adjustments Page Probe Adjustment for the P6139A Probe Compensate the Probe Page Page Measure Probe Bandwidth Page Adjust the Probe High Frequency Response Page Page Page Page Page Display Assembly Adjustment Rotation, Brightness, and Contrast Adjustment Page Page Page Page Maintenance Related Maintenance Procedures Preparation Preventing ESD Maintenance TDS 684A, TDS 744A, & TDS 784A Service Manual 63 Table 61: Relative Susceptibility to Static-Discharge Damage Inspection and Cleaning General Care Inspection and Cleaning Procedures Page Page Page Page Removal and Installation Procedures Preparation Please Read List of Modules General Instructions Summary of Procedures TDS 684A, TDS 744A, & TDS 784A Service Manual 611 612 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 61: External Modules Page Page Access Procedure Procedures for External Modules Front-Panel Knobs Line Fuse and Line Cord EMI Gaskets Rear Cover and Cabinet Page Page Page Front Cover, Trim Ring, Menu Buttons, and Attenuator Panel A12 Front-Panel Assembly Page Display-Frame Assembly Cabinet Modules Page Page Procedures for Outer-Chassis Modules Fan A14 D1 Bus and Analog-Power and Digital-Power Cables Page Page A29 Video Trigger Board Page Page Page A11 Processor/Display Board Top Cover and Board Brackets Page Rear-Panel Cables A10 Acquisition Board Page TDS 684A, TDS 744A, & TDS 784A Service Manual 641 Figure 618: A10 Acquisition Board Removal Floppy Disk Page Rear Chassis Page Procedures for Inner-Chassis Modules A16 Low Voltage Power Supply Page Page Page Page Front Subpanel Main Chassis Disassembly for Cleaning Page Page Page Troubleshooting Diagnostics Firmware Updates TDS 684A, TDS 744A, & TDS 784A Service Manual 659 Figure 626: Primary Troubleshooting Procedure 660 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 626: Primary Troubleshooting Procedure (Cont.) TDS 684A, TDS 744A, & TDS 784A Service Manual 661 Figure 627: Module Isolation Troubleshooting Procedure 662 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 628: A16 Low Voltage Power Supply Module Isolation Troubleshooting Procedure Page 664 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 630: Color Display Troubleshooting Procedure Page 666 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 633: Processor/Acquisition Troubleshooting Procedure TDS 684A, TDS 744A, & TDS 784A Service Manual 667 Figure 634: Processor/Front Panel Troubleshooting Procedure 668 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 635: Attenuator/Acquisition Troubleshooting Procedure Page 670 TDS 684A, TDS 744A, & TDS 784A Service Manual Figure 636: A11 DRAM Processor/Display Module (View of Right Side) Page Page Page Options and Accessories Options Options and Accessories 72 TDS 684A, TDS 744A, & TDS 784A Service Manual Table 71: Options (Cont.) Standard Accessories Optional Accessories Accessory Probes Accessory Software Warranty Information Service Assurance Page Page Page Page Page Diagrams Symbols 92 TDS 684A, TDS 744A, & TDS 784A Service Manual A12 Figure 91: Interconnections A10 A18 TDS 684A, TDS 744A, & TDS 784A Service Manual 93 A30 Figure 91: Interconnections (Cont.) A32 A31 94 TDS 684A, TDS 744A, & TDS 784A Service Manual A14 Figure 92: Block Diagram A17 A12 TDS 684A, TDS 744A, & TDS 784A Service Manual 95 A23 Figure 92: Block Diagram (Cont.) A30 A32 Page Page Mechanical Parts List Parts Ordering Information Module Servicing Using the Replaceable Parts List Abbreviations Mfr. Code to Manufacturer Cross Index TDS 684A, TDS 744A, & TDS 784A Service Manual 103 Manufacturers Cross Index Mfr. Code Manufacturer Address City, State, Zip Code Page Page 106 TDS 684A, TDS 744A, & TDS 784A Service Manual Replaceable Parts List Discontd Qty Name & Description Mfr. Effective Serial No. Number Serial No. TDS 684A, TDS 744A, & TDS 784A Service Manual 107 A12 Figure 101: External Modules 108 TDS 684A, TDS 744A, & TDS 784A Service Manual Replaceable Parts List Discontd Qty Name & Description Mfr. Effective Serial No. Number Serial No. TDS 684A, TDS 744A, & TDS 784A Service Manual 109 A14 Figure 102: Outer-Chassis Modules A11 A10 Page Page 1012 TDS 684A, TDS 744A, & TDS 784A Service Manual Replaceable Parts List Page 1014 TDS 684A, TDS 744A, & TDS 784A Service Manual Replaceable Parts List Page 1016 TDS 684A, TDS 744A, & TDS 784A Service Manual Replaceable Parts List Figure 107: Accessories TDS 684A, TDS 744A, & TDS 784A Service Manual 1017 Replaceable Parts List