Tektronix TDS2004B

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Theory of Operation

3-- 8

TDS1000B and TDS2000B Series Oscilloscope Service Manual

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Table of Contents6
General Safety Summary10
Service Safety Summary12
Preface14
Manual Conventions14
Related Documentation14
Specifications16
Table 1- 1: Oscilloscope Specifications18
Table 1- 2: Oscilloscope General Specifications25
Operating Information28
Theory of Operation32
Figure 3- -1: Module-Level Block Diagram (Two Channel)35
Figure 3- -2: Module-Level Block Diagram (Four Channel)36
Main Board37
Acquisition System37
Input Signal Interface38
Probe Compensation38
External Trigger38
Main Board Power38
Power Supply39
Display Module39
Front Panel39
Four-Channel Oscilloscopes40
Performance Verification42
Required Equipment44
Test Record45
Performance Verification Procedures45
Self Test45
Self Calibration45
Check DC Gain Accuracy47
Check Bandwidth48
Check Sample Rate Accuracy and Delay Time Accuracy49
Check Edge Trigger Sensitivity51
Check Vertical Position Accuracy54
Figure 4- -1: Example of a Line Graph for the Vertical Position Accuracy57
Adjustment Procedures58
Required Equipment60
Table 5- -1: Required Equipment60
Adjustment Procedure61
Enable the Service Menu61
Figure 5- -1: Adjustment Setups63
Adjustment Procedure64
Table 5- -2: Adjustment Steps65
Maintenance70
Preventing ESD72
Inspection and Cleaning73
General Care73
Interior Cleaning73
Exterior Cleaning73
Table 6- -1: External Inspection Check List74
Table 6- -2: Internal Inspection Check List75
Removal and Installation Procedures77
List of Modules77
Summary of Procedures77
Rear Feet77
Flip Feet77
Table 6- -3: List of Procedures77
Power Button78
Rear Case78
Figure 6- -1: Locator for Trim and Cabinet Removal78
Figure 6- -2: Locator for Internal Modules78
Power Supply Module82
Internal Assembly83
Display Cable83
Front-Panel Cable85
Figure 6- -3: Securing the Display Cable to the Chassis85
Main Board Module86
Front-Panel Module89
Keypad89
Front Case89
Troubleshooting91
Adjustment after Repair91
Figure 6- -4: Oscilloscope Troubleshooting Tree (192
Figure 6- -5: Oscilloscope Troubleshooting Tree (293
Figure 6- -6: Oscilloscope Troubleshooting Tree (394
Figure 6- -7: Oscilloscope Troubleshooting Tree (495
Troubleshooting Tree96
PROBE COMP Output96
Troubleshooting the Power Supply96
Troubleshooting the Display97
Troubleshooting the Backlight99
Figure 6- -8: Measuring the Backlight Voltage100
Troubleshooting the Front Panel101
Troubleshooting the Main Board103
Running Diagnostics104
Troubleshooting Input Connections104
Troubleshooting the USB Interface105
Using the Error Log105
Table 6- -4: List of Error Codes105
Repackaging Instructions107
Packaging107
Storage107
Diagrams108
Figure 7- -1: TDS1000B and TDS2000B Series Block Diagram111
Replaceable Parts112
Parts Ordering Information114
Using the Replaceable Parts List116
Table 8- -1: Replaceable Parts List, 2-Channel Models117
Figure 8- -1: Exploded Diagram, 2-Channel Models118
Table 8- -2: Replaceable Parts List, 4-Channel Models119
Figure 8- -2: Exploded Diagram, 4-Channel Models120
Table 8- -3: Replaceable Parts List, Power Supply Module, Cables, and Wires121
Figure 8- -3: Exploded Diagram, Power Supply Module, Cables and Wires122
Table 8- -4: Replaceable Parts List, Back Case and Trim123
Figure 8- -4: Exploded Diagram, Back Case and Trim124
Table 8- -5: Standard Accessories125
Table 8- -6: Optional Accessories125
Appendix A: Example of a Vertical Position Accuracy Test Spreadsheet128
Index134

Tektronix TDS2004B - Page 41

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