Tektronix TDS2012C - Figure 3-2: Module-Level Block Diagram (4-Channel)

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Theory of Operation

Figure 3-2: Module-level block diagram (4-channel)

TDS2000C Series Oscilloscope Service Manual 3–3

Main Page

Table of Contents5
General Safety Summary10
Service Safety Summary12
Preface13
Manual Conventions13
Related Documentation13
Specifications15
Signal Acquisition System Characteristics17
Table 1-1: Signal Acquisition System Characteristics17
Time Base System21
Table 1-2: Time Base System21
Triggering System23
Table 1-3: Triggering System23
Display Specifications27
Table 1-4: Display Specifications27
Interfaces and Output Ports Specifications28
Data Handling Characteristics28
Power Distribution System28
Table 1-5: Interfaces and Output Ports Specifications28
Table 1-6: Data Handling Characteristics28
Table 1-7: Power Distribution System28
Mechanical Characteristics29
Environmental Performance29
Table 1-8: Mechanical Characteristics29
Table 1-9: Environmental Performance29
Data Logging System Characteristics30
Limit Testing System Characteristics30
Table 1-10: Data Logging System Characteristics30
Table 1-11: Limit Testing System Characteristics30
Where to Find Operating Information33
Theory of Operation37
System Level Block Diagrams40
Figure 3-1: Module-Level Block Diagram (2-Channel)40
Figure 3-2: Module-Level Block Diagram (4-Channel)41
Main Board42
Acquisition System42
Input Signal Interface43
Probe Compensation43
External Trigger43
Main Board Power43
Power Supply44
Display Module44
Front Panel44
Table 4-1: Performance Verification47
Four-Channel Oscilloscopes48
Performance Verification48
Test Record48
Table 4-2: Test Record48
Performance Verification Procedures49
Self Test49
Self Calibration49
Check DC Gain Accuracy49
Check Bandwidth51
Check Edge Trigger Sensitivity53
Check Vertical Position Accuracy56
Figure 4-1: Example of a Line Graph for the Vertical Position Accuracy Test59
Adjustment Procedures61
Required Equipment63
Table 5-1: Required Equipment63
Adjustment Procedure64
Enable the Service Menu64
Figure 5-1: Adjustment Setups65
Adjustment Procedure66
Table 5-2: Adjustment Steps67
Maintenance73
Preventing ESD73
Inspection and Cleaning73
General Care74
Interior Cleaning74
Exterior Cleaning74
Exterior Inspection75
Interior Inspection75
Table 6-1: External Inspection Checklist75
Cleaning Procedure, Interior76
Table 6-2: Internal Inspection Checklist76
Removal and Installation Procedures78
Summary of Procedures78
Rear Feet78
Flip Feet78
Front-Panel Knobs78
Rear Case78
Front Feet78
Figure 6-1: Locator for Trim and Cabinet Removal (4-Channel Model Shown)79
Figure 6-2: Locator for Internal Modules (4-Channel Model Shown)79
Power Supply Module84
Internal Assembly85
Display Adapter Module86
Figure 6-3: Display Adapter Board Connections86
Figure 6-4: Connecting the Display Cable87
Front-Panel Cable89
Main Board Module90
Display Module92
Front-Panel Module93
Keypad94
Troubleshooting95
Adjustment after Repair95
Required Tools and Equipment95
Troubleshooting Tree95
Table 6-3: Tools and Equipment95
Figure 6-5: Oscilloscope Troubleshooting Tree96
Figure 6-6: Oscilloscope Troubleshooting Tree97
Figure 6-7: Oscilloscope Troubleshooting Tree98
Figure 6-8: Oscilloscope Troubleshooting Tree99
Probe Comp Output100
Table 6-4: Probe Comp Output100
Troubleshooting the Power Supply101
Table 6-5: Troubleshooting the Power Supply101
Troubleshooting the Display102
Table 6-6: Troubleshooting the Display102
Troubleshooting the Backlight104
Figure 6-9: Measuring the Backlight Voltage105
Troubleshooting the Front Panel106
Table 6-7: Troubleshooting the Front Panel - Service106
Table 6-8: Troubleshooting the Front Panel - Service Diag106
Table 6-9: Troubleshooting the Front Panel - Mfg. Test106
Table 6-10: Expected Signals at J202107
Troubleshooting the Main Board109
Table 6-11: Troubleshooting the Main Board109
Table 6-12: List of Error Codes110
Repackaging Instructions112
Diagrams113
Figure 7-1: TDS2000C Series Block Diagram114
Replaceable Parts115
Parts Ordering Information117
Using the Replaceable Parts List118
Table 8-1: Replaceable Parts List118
Parts Lists and Exploded Views119
Table 8-2: Replaceable Parts List, 2-Channel Models119
Figure 8-1: Exploded Diagram, 2-Channel Models120
Table 8-3: Replaceable Parts List, 4-Channel Models121
Figure 8-2: Exploded Diagram, 4-Channel Models122
Table 8-4: Replaceable Parts List, Power Supply Module, Cables, and Wires123
Figure 8-3: Power Supply Module, Cables, and Wires (2-Ch Model Shown, with 4-Ch Model in Circle)124
Table 8-5: Replaceable Parts List, Back Case and Trim125
Figure 8-4: Exploded Diagram, Back Case and Trim126
Appendix A: Example of a Vertical Position Accuracy Test Spreadsheet127
Example Filled-In Vertical Position Accuracy Test Spreadsheet127
Table A-1: Vertical Position Accuracy Test Spreadsheet127

Tektronix TDS2012C - Figure 3-2: Module-Level Block Diagram (4-Channel)

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