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Tektronix 475 Technical Manual
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TM 11-6625-2735-14-1
SAFETY PRECAUTION
A periodic review of safety precautions in TB 385-4, Safety Precautions for Maintenance of
Electrical/Electronic Equipment, is recommended. When the equipment is operated with covers
removed, DO NOT TOUCH exposed connections or components. MAKE CERTAIN you are not
grounded when making connections or adjusting components inside the test instrument.
Change 1
E/(F blank)
8
10
Table of Contents
Table of Contents
12
Default Chapter
16
Oscilloscope OS-261B(V)1/U and OS-261C(V)1/U
16
Introduction
17
Os-261B(V)1/U
17
General Information and Installation
19
Introduction
19
Characteristics
19
Delay Time and Differential Time Measurement
25
Installation
31
2 Operating Information
33
Preliminary Instructions
33
Introduction
33
Safety Information
33
Operating Power Sources
33
Line Voltage and Regulating Range
33
Options
34
Controls and Connectors
34
General
34
Cathode-Ray Tube (CRT) and Display
34
Vertical Deflection System
34
A and B Triggering
37
Calibrator and Power
39
Rear Panel
40
Obtaining Basic Displays
40
Introduction
40
Normal Sweep Display
40
Magnified Sweep Display
41
Delayed Sweep Displays
41
Mixed Sweep Display
41
X-Y Display
41
Circuit Description
43
Digital Logic
43
Introduction
43
Outline for Circuit Description
43
Basic Block Diagram of the
44
Preamplifier Circuit
44
Instrument
44
Channel 1 Preamp
46
General
46
Input Coupling
47
Input Attenuator
47
First Cascode Amplifier
47
Channel 2 Preamp
48
Second Cascode Amplifier
48
Third Cascode Amplifier
48
General
48
Vertical Channel Switching
49
First Cascode Amplifier
49
General
49
Channel Switch IC
50
Switching Logic Flip-Flops
50
Vertical Output Amplifier
51
Channel 2 Signal Output Amplifier
51
Chop Blanking Amplifier
51
First IC Amplifier
51
General
51
Normal Trigger Pickoff Amplifier
51
Scale-Factor Switching Circuits
51
Two Megahertz Clock
51
A Trigger Generator
52
Atrigger Generator
52
General
52
Second IC Amplifier
52
Input Source Follower
53
Paraphase Amplifier
53
Trigger Coupling
53
Trigger Source
53
Trigger View Amplifier
53
Tunnel Diode Driver
53
B Trigger Generator
54
Btrigger Generator
54
Sweep and Z-Axis Logic
54
General
54
Trigger Source
54
Sweep Control Integrated Circuit
55
A Trigger TD Reset Circuit
56
Delayed Gate Comparator
56
Holdoff Start Circuit
56
Main Gate Comparator
56
Z Axis Logic Multivibrator
56
A +GATE and B +GATE Amplifiers
57
B Trigger TD Reset Circuit
57
Delaying Sweep Latch Circuit
57
LOWLINE Indicator Circuit
57
Main Sweep Holdoff Gate and Delayed Sweep Override Amplifier
57
Sweep Generators (And) Timing
58
Switching
58
General
58
Sweep Generators
58
Delaying Sweep Generator
59
Main Gate Amplifier
59
Sweep Disconnect Amplifier
59
Delay Pickoff Comparator
60
Delaying Sweep End Difference Amplifier
60
Output Buffer Amplifier
60
Sawtooth Sweep Generator
60
Sweep Start Amplifier
60
B" Gate Amplifier
61
Mixed Mode Operation
61
Non-Delaying Sweep End Difference Amplifier
61
Non-Delaying Sweep Generator Differences
61
Non-Delaying Sweep Generators
61
Horizontal Amplifier
62
General
62
TIME/DIV Functions (Knobs Unlocked)
62
Low-Voltage Power Supply
63
Gain Setting Amplifier
63
General
63
Input Paraphase Amplifier
63
Output Amplifier
63
Switching Circuit
63
50-Volt Supply
65
Power Input
65
Secondary Circuit
65
Crt Circuit
66
110-Volt Supply
66
General
66
High-Voltage Oscillator
67
High-Voltage Regulator
67
Control-Grid DC Restorer
68
CRT Control Circuits
68
High-Voltage Rectifiers and Output
68
Z-Axis Amplifier
68
Calibrator
69
Fan Motor Circuit
69
General
69
Multivibrator
69
Output Amplifier
69
Block Diagram
44
Maintenance
71
Maintenance Section Outline
71
Cabinet and Rack Adapter Removal
72
Standard Cabinet Removal
72
Rack Adapter Removal
73
Rack Adapter Installation
74
Preventive Maintenance
74
Introduction
74
Cleaning
74
Air Filter
75
CRT Face, Filter and Shields
75
Exterior
75
General Interior
75
Switch Contacts
75
Visual Inspection
76
Lubrication
76
Semiconductor Checks
76
Troubleshooting
76
Introduction
76
Troubleshooting Aids
76
Recalibration
76
Troubleshooting Equipment
77
Diagrams
77
Diode Color-Code
77
Resistor Color-Code
77
Semiconductor Lead Configuration
77
Standard Cabinet Installation
73
Color Codes for Resistors and Capacitors
78
Troubleshooting Techniques
80
Check Associated Equipment
80
Check Control Settings
80
Check Instrument Calibration
80
Isolate Trouble to a Circuit
80
Multimeter
80
Semiconductor Tester
80
Test Oscilloscope
80
Variable Autotransformer
80
Visual Check
80
Check Circuit Board Interconnection
81
Check Individual Components
81
Check Voltages and Waveforms
81
Special Troubleshooting Information
84
General
84
Repair and Readjust the Circuit
84
Troubleshooting the L.V. Power Supplies
85
Troubleshooting the High-Voltage Circuit
86
Troubleshooting the Sweep Circuits
86
Corrective Maintenance
88
Introduction
88
Troubleshooting the Horizontal Amplifier
88
Troubleshooting the Vertical System
88
Troubleshooting the Z-Axis Circuit
88
Obtaining Replacement Parts
89
Soldering Techniques
89
Small Component Replacement
90
General
90
Transistor and I.C. Replacement
90
Interconnecting Pin Replacement
91
Circuit Board Replacement
92
Cam Switch Replacement
92
Fuse Replacement
92
Vertical Preamp Board Removal
94
Trigger Generator and Z-Axis Logic Board Removal
95
Fan Motor Board Removal
96
Timing Board Removal
96
Vertical Output Board Removal
96
Inverter Board Removal (Option 7 Only)
97
Power Supply Board Removal
97
Main Interface Board Removal
98
Power Transformer Removal
99
Cathode-Ray Tube Removal
100
Cathode-Ray Tube Installation
101
High-Voltage Multiplier Removal
101
Delay Line Removal
102
Recalibration after Repair
102
Instrument Repackaging
102
5 Performance Check Equipment Alternatives
105
Introduction
105
Using this Procedure
105
Test Equipment Required
105
General
105
Special Calibration Fixtures
105
Performance Check
105
Preliminary Procedure for Performance Check
108
Default Chapter
108
Operating Temperature
108
Operating Voltage
108
Power Source
108
Warm up
108
Display and Vertical System Check
109
Trigger System Check
113
11. Check a Low-Frequency Triggering
113
12. Check B Low-Frequency Triggering
115
13. Check B 40 Megahertz Triggering
116
14. Check a 40 Megahertz Triggering
116
Check a 200 Megahertz Triggering
117
16. Check B 200 Megahertz Triggering
117
17. Check TRIG MODE NORM Operation
118
18. Check TRIG MODE SINGL SWP Operation
118
Check TRIG VIEW Operation
118
Horizontal System Check
119
20. Check VAR TIME/DIV Range
119
22. Check a Timing Accuracy
120
23. Check a INTEN Timing Accuracy
120
24. Check a INTEN Magnified Timing Accuracy
120
25. Check a Magnified Timing Accuracy
120
Check Sweep Length and Horizontal POSITION Range
120
26. Check Differential Delay Time Accuracy
121
27. Check Delay Time Jitter
122
28. Check MIX (Mixed Sweep) Timing Accuracy
122
Gate Outputs, External Z-Axis and Calibrator Checks
123
29. Check X Gain
123
30. Check X Bandwidth
123
31. Check a and B +GATE Outputs
124
32. Check CH 2 VERT SIGNAL out
124
33. Check EXT Z-AXIS Operation
124
34. Check CALIBRATOR Operation
124
6 Schematic Diagrams & Options 04 and
125
7 Replaceable Mechanical Parts
135
Appendix A References
169
Introduction
171
Integral Components of End Item
174
Maintenance Allocation
179
D-2 Maintenance Function
179
Column Entries
180
Tool and Test Equipment Requirement
180
Circuit
181
Appendix C Additional Authorization List
181
Maintenance Allocation Chart
181
Oscilloscope
183
Oscilloscope OS-261B(V)1/U and
184
Remarks
185
Appendix Eexpendable Supplies and Materials List Introduction
187
E-1 . Scope
187
Explanation of Columns
187
Expendable Supplies and Materials
188
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Instruction Manual
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Tektronix 475 Specifications
General
Brand
Tektronix
Model
475
Category
Test Equipment
Language
English
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