Tektronix 784A User Manual Page 25
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Introduction
TDS 684A, TDS 744A, & TDS 784A Service Manual
xxi
Before You Begin
This manual is for servicing the TDS 684A and 7XXA Digitizing Oscilloscopes.
To prevent injury to yourself or damage to the oscilloscope, do the following
tasks before you attempt service:
H Be sure you are a qualified service person.
H Read the Safety Summary found at the beginning of this manual.
H Read Service Strategy in this section and Supplying Operating Power in
section 2.
When using this manual for servicing, be sure to heed all warnings, cautions, and
notes.
- Service Manual 1
- Digitizing Oscilloscope 1
- 070-8992-03 1
- WARRANTY 3
- List of Figures 7
- Table of Contents 10
- List of Tables 11
- General Safety Summary 13
- Safety Terms and Symbols 14
- Symbols on the Product 15
- CSA Certified Power 15
- Service Safety Summary 17
- Manual Structure 19
- Manual Conventions 20
- Related Manuals 20
- Introduction 23
- Self Service 24
- Before You Begin 25
- Specifications 28
- User Interface 29
- Signal Acquisition System 29
- Horizontal System 30
- Trigger System 31
- Acquisition Control 31
- On-Board User Assistance 32
- Measurement Assistance 32
- Digital Signal Processing 33
- Nominal Traits 36
- Warranted Characteristics 42
- Typical Characteristics 48
- Installation 55
- Operating Voltage 56
- Operating Environment 57
- Repackaging Instructions 58
- Installed Options 59
- Operating Instructions 61
- How to Use Help 62
- How to Use the Status 62
- How to Set Functions 63
- How to Set Complex 66
- Functions 66
- Theory of Operation 72
- Tube Assembly 73
- Front Panel 74
- Rear Panel 74
- Low Voltage Power Supply 74
- Conventions 78
- Brief Procedures 81
- Verify Pass 82
- Highlight Cal 82
- Functional Tests 83
- Verify All Input Channels 84
- Verify the Time Base 86
- Verify the Main and 87
- Delayed Trigger Systems 87
- Verify the File System 89
- TDS 684A Test Record 95
- TDS 684A Test Record (Cont.) 96
- TDS 7XXA Test Record 99
- Performance Tests 100
- TDS 7XXA Test Record (Cont.) 100
- Check Offset Accuracy 103
- (Zero Setting) 103
- 0 V when the 104
- Check DC Voltage 105
- Measurement Accuracy 105
- Turn on the 108
- Check Analog Bandwidth 109
- Check Delay Between 113
- Channels 113
- Terminator 114
- Time Base System Checks 118
- Trigger System Checks 120
- Check Accuracy 124
- Trigger-Level or 124
- Threshold, DC Coupled 124
- Set DC calibration generator 126
- Read results 126
- Sensitivity, Edge Trigger 128
- DC Coupled 128
- Check if stable trigger 130
- Output Signal Checks 133
- Check output 135
- Check Probe 136
- Compensator Output 136
- Check Video Trigger 141
- Stop shows test complete 144
- Positive pulse 146
- Negative pulses 146
- 50 Cable 148
- Signal Generator 148
- Adjustment Procedures 160
- Optional Peripherals 161
- Test Equipment 161
- Performing the 161
- Adjustments 161
- Complete Adjustment 162
- Individual Adjustments 162
- Partial Adjustment 162
- Adjustment After Repair 163
- Adjustment Dependencies 163
- Equipment Required 164
- Adjustment Instructions 166
- Software-Based 167
- Unprotected 168
- Protected 168
- Compensate the Probe 169
- Probe compensated correctly 171
- Probe overcompensated 171
- Probe undercompensated 171
- Measure Probe Bandwidth 172
- Adjust the Probe — High 174
- Frequency Response 174
- Repeat for lower cover 175
- Not Used 178
- Display Assembly Adjustment 180
- 10% Patch 181
- 5% Patch 181
- Switch No. 1 2 3 4 5 6 7 8 182
- Closed X X X X X X X 182
- Maintenance 185
- Preparation 186
- Inspection and Cleaning 188
- Preparation — Please Read 193
- General Instructions 194
- Summary of Procedures 194
- Figure 6–1: External Modules 196
- A16 Power Supply 198
- Front Subpanel 198
- A30 Display 198
- Assembly 198
- Main Chassis 198
- Access Procedure 199
- Front-Panel Knobs 200
- Line Fuse and Line Cord 201
- tip (Items 1 and 3) 202
- EMI Gaskets 202
- Rear Cover and Cabinet 202
- Front Cover, Trim Ring 206
- Menu Buttons, and 206
- Attenuator Panel 206
- tip (Items 1 and 2) 207
- A12 Front-Panel Assembly 207
- Display-Frame Assembly 209
- Cabinet Modules 210
- A14 D1 Bus and 213
- Analog-Power and 213
- Digital-Power Cables 213
- Analog and Digital Power 214
- Cables (Interchangeable) 214
- A14 D1 Bus 214
- tip, remove the two screws 215
- A23 SerPar Board — 215
- RS232/Centronics 215
- Hardcopy Interface 215
- A29 Video Trigger Board 216
- Coax Cable 218
- To J1500 219
- A11 Processor/Display 220
- Top Cover and Board 221
- Brackets 221
- (Item 6). Have handy a 223
- Rear-Panel Cables 223
- A10 Acquisition Board 223
- Floppy Disk 226
- Rear Chassis 228
- CH3 OUT to J1201 229
- AUXILIARY TRIGGER to J1550 229
- MAIN TRIGGER to J1000 229
- DELAY TRIGGER to J1001 229
- A16 Low Voltage Power 230
- A30 Display Assembly 231
- Move circuit board 234
- Disassembly for Cleaning 237
- Troubleshooting 241
- Firmware Updates 242
- Options and Accessories 258
- Table 7–1: Options (Cont.) 259
- Standard Accessories 260
- Optional Accessories 261
- Accessory Software 262
- Warranty Information 262
- Service Assurance 262
- Electrical Parts List 265
- Diagrams 268
- Figure 9–1: Interconnections 269
- Figure 9–2: Block Diagram 271
- Mechanical Parts List 275
- Abbreviations 276
- Mfr. Code to Manufacturer 276
- Cross Index 276
- Manufacturers Cross Index 277
- Replaceable Parts List 280
- Figure 10–1: External Modules 281
- Figure 10–5: Cables, Top View 287
- Figure 10–6: Floppy Disk 289
- Figure 10–7: Accessories 290
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