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TDS2012C
Tektronix TDS2012C User Manual
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Maintenance
6.
Check
that
the
c
urrent
output
at
J204
of
the
Display
Adapter
board
for
each
wire
is
around
25
mA.
If
the
reading
is
not
correct,
the
Display
Adapter
module
is
probably
defective.
Replace
it.
Figure
6-9:
Measuring
the
backlight
voltage
TDS2000C
Series
Oscilloscope
Service
Manual
6–33
104
106
Table of Contents
Table of Contents
5
General Safety Summary
10
Service Safety Summary
12
Preface
13
Manual Conventions
13
Related Documentation
13
Specifications
15
Signal Acquisition System Characteristics
17
Table 1-1: Signal Acquisition System Characteristics
17
Time Base System
21
Table 1-2: Time Base System
21
Triggering System
23
Table 1-3: Triggering System
23
Display Specifications
27
Table 1-4: Display Specifications
27
Interfaces and Output Ports Specifications
28
Data Handling Characteristics
28
Power Distribution System
28
Table 1-5: Interfaces and Output Ports Specifications
28
Table 1-6: Data Handling Characteristics
28
Table 1-7: Power Distribution System
28
Mechanical Characteristics
29
Environmental Performance
29
Table 1-8: Mechanical Characteristics
29
Table 1-9: Environmental Performance
29
Data Logging System Characteristics
30
Limit Testing System Characteristics
30
Table 1-10: Data Logging System Characteristics
30
Table 1-11: Limit Testing System Characteristics
30
Where to Find Operating Information
33
Theory of Operation
37
System Level Block Diagrams
40
Figure 3-1: Module-Level Block Diagram (2-Channel)
40
Figure 3-2: Module-Level Block Diagram (4-Channel)
41
Main Board
42
Acquisition System
42
Input Signal Interface
43
Probe Compensation
43
External Trigger
43
Main Board Power
43
Power Supply
44
Display Module
44
Front Panel
44
Table 4-1: Performance Verification
47
Four-Channel Oscilloscopes
48
Performance Verification
48
Test Record
48
Table 4-2: Test Record
48
Performance Verification Procedures
49
Self Test
49
Self Calibration
49
Check DC Gain Accuracy
49
Check Bandwidth
51
Check Edge Trigger Sensitivity
53
Check Vertical Position Accuracy
56
Figure 4-1: Example of a Line Graph for the Vertical Position Accuracy Test
59
Adjustment Procedures
61
Required Equipment
63
Table 5-1: Required Equipment
63
Adjustment Procedure
64
Enable the Service Menu
64
Figure 5-1: Adjustment Setups
65
Adjustment Procedure
66
Table 5-2: Adjustment Steps
67
Maintenance
73
Preventing ESD
73
Inspection and Cleaning
73
General Care
74
Interior Cleaning
74
Exterior Cleaning
74
Exterior Inspection
75
Interior Inspection
75
Table 6-1: External Inspection Checklist
75
Cleaning Procedure, Interior
76
Table 6-2: Internal Inspection Checklist
76
Removal and Installation Procedures
78
Summary of Procedures
78
Rear Feet
78
Flip Feet
78
Front-Panel Knobs
78
Rear Case
78
Front Feet
78
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 Module
84
Internal Assembly
85
Display Adapter Module
86
Figure 6-3: Display Adapter Board Connections
86
Figure 6-4: Connecting the Display Cable
87
Front-Panel Cable
89
Main Board Module
90
Display Module
92
Front-Panel Module
93
Keypad
94
Troubleshooting
95
Adjustment after Repair
95
Required Tools and Equipment
95
Troubleshooting Tree
95
Table 6-3: Tools and Equipment
95
Figure 6-5: Oscilloscope Troubleshooting Tree
96
Figure 6-6: Oscilloscope Troubleshooting Tree
97
Figure 6-7: Oscilloscope Troubleshooting Tree
98
Figure 6-8: Oscilloscope Troubleshooting Tree
99
Probe Comp Output
100
Table 6-4: Probe Comp Output
100
Troubleshooting the Power Supply
101
Table 6-5: Troubleshooting the Power Supply
101
Troubleshooting the Display
102
Table 6-6: Troubleshooting the Display
102
Troubleshooting the Backlight
104
Figure 6-9: Measuring the Backlight Voltage
105
Troubleshooting the Front Panel
106
Table 6-7: Troubleshooting the Front Panel - Service
106
Table 6-8: Troubleshooting the Front Panel - Service Diag
106
Table 6-9: Troubleshooting the Front Panel - Mfg. Test
106
Table 6-10: Expected Signals at J202
107
Troubleshooting the Main Board
109
Table 6-11: Troubleshooting the Main Board
109
Table 6-12: List of Error Codes
110
Repackaging Instructions
112
Diagrams
113
Figure 7-1: TDS2000C Series Block Diagram
114
Replaceable Parts
115
Parts Ordering Information
117
Using the Replaceable Parts List
118
Table 8-1: Replaceable Parts List
118
Parts Lists and Exploded Views
119
Table 8-2: Replaceable Parts List, 2-Channel Models
119
Figure 8-1: Exploded Diagram, 2-Channel Models
120
Table 8-3: Replaceable Parts List, 4-Channel Models
121
Figure 8-2: Exploded Diagram, 4-Channel Models
122
Table 8-4: Replaceable Parts List, Power Supply Module, Cables, and Wires
123
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 Trim
125
Figure 8-4: Exploded Diagram, Back Case and Trim
126
Appendix A: Example of a Vertical Position Accuracy Test Spreadsheet
127
Example Filled-In Vertical Position Accuracy Test Spreadsheet
127
Table A-1: Vertical Position Accuracy Test Spreadsheet
127
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Tektronix TDS2012C Specifications
General
Brand
Tektronix
Model
TDS2012C
Category
Oscilloscope
Language
English
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