Tektronix TAS 465 - Figure 3 1: Block Diagram

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Circuit Description

Theory of Operation

3Ć2

2 PINS

J80

J82 P82

P80

DISPLAY CONTROL BOARD

A02

5 PINS

J84

P84

40 PINS

J50 P50

A05

PROCESSOR BOARD

16 PINS 16 PINS

J30

J84

J30

P30P30

P84

5 PINS

FRONTĆPANEL

GND

J35

PROBE COMP

A04

BEZEL

BUTTON

BOARD

J40

10 PINS

P40

10 PINS

A09

J55

5 PINS

12 TERMINATIONS

5 TERMINATIONS

P55

LV & HV POWER SUPPLY BOARD

115/230V

FAN

2 PINS

A63

2 TERMINATIONS

1 TERMINATION

BOARD

Figure 3Ć1:ăBlock Diagram

Main Page

Table of Contents3
List of Figures9
List of Tables13
Safety Summary15
Symbols and Terms15
Specific Precautions16
Preface19
Related Manuals20
Product Description21
User Interface22
Autoset22
Menus22
General Purpose Knob and TOGGLE22
Save/Recall Setups22
Vertical System23
Horizontal System23
Trigger System23
Measurement Cursors23
Nominal Traits25
Table 1 1: Nominal Traits25
Table 1 2: Nominal Traits26
Table 1 3: Nominal Traits26
Table 1 4: Nominal Traits26
Table 1 9: Nominal Traits Mechanical28
Warranted Characteristics29
Performance Conditions29
Table 1 10: Warranted Characteristics29
Typical Characteristics35
Table 1 18: Typical Characteristics35
Table 1 19: Typical Characteristics35
Table 1 20: Typical Characteristics36
Table 1 21: Typical Characteristics37
Table 1 22: Typical Characteristics37
Table 1 23: Typical Characteristics37
Table 1 24: Typical Characteristics37
Installation and Power on39
Figure 2 1: Rear Panel39
Figure 2 2: Fuse Compartment40
Figure 2 3: POWER Button40
Quick Start41
Selecting and Deselecting Input Channels41
Using the Menus41
Connecting a Signal42
Using AUTOSET42
Compensating the Probe43
Figure 2 4: Probe Compensation Signal Displayed after AUTOSET43
Figure 2 5: Connections for Compensating a Probe43
Figure 2 6: How Probe Compensation Affects Signals45
Figure 2 7: Location of Probe Head Adjustment45
Menu Map46
Figure 2 8: Menu Map46
Circuit Description47
Logic Conventions47
Module Interconnection47
Figure 3 1: Block Diagram48
Analog Board50
Attenuators A150
Probe Coding Interface A150
Analog Acquisition Hybrid A150
External Trigger A150
Processor System50
Processor Subsystem A550
ROM/RAM Subsystem A551
Readout Subsystem A551
Front Panel Interface Subsystem A551
Analog Board Interface Subsystem A551
Display Assembly52
Vertical Output A352
Horizontal Output A352
High Voltage A352
Front Panel52
Menu Switches A453
Cpu A453
FPP Pots & Probes A453
Leds & Driver A453
Switches A454
Power Supply54
Fan54
General Instructions55
Using the Brief Performance Checks Procedures55
Using the Performance Tests Procedures55
Conventions56
Figure 4 1: Graticule References56
Brief Performance Checks57
Power on Self Tests57
Functional Tests57
Functional Tests Prerequisites58
Verify the Probe Compensator Output58
Figure 4 2: Test Hookup for Functional Tests58
Verify the Input Channels59
Verify the Alt/Chop and Add Functions60
Verify the Time Base60
Verify the Trigger System61
Verify the External Trigger63
Temperature Compensation Calibrations63
Horizontal Sweep Path63
Figure 4 3: Horizontal Adjustments (One)64
Figure 4 4: Horizontal Adjustments (Two)64
Vertical Signal Path65
Figure 4 5: Horizontal Adjustments (Three)65
Performance Tests67
Performance Tests Prerequisites67
Equipment Required67
Table 4 1: Required Test Equipment68
Vertical System Checks69
Check DC Gain and Voltage Measurement Accuracy69
Figure 4 6: Gain and Voltage Test Setup69
Check Trigger Level Accuracy70
Table 4 2: DC Gain and Delta Volts Accuracy70
Check DC Coupling Bandwidth71
Figure 4 7: Trigger Level Test Setup71
Figure 4 8: Bandwidth Test Setup72
Table 4 3: DC Coupled Bandwidth72
Check X Axis Gain73
Figure 4 9: X Axis Gain Test Setup73
Horizontal System Checks74
Check Time Base and Time Cursor Accuracy74
Figure 4 10: Timing Test Setup74
Table 4 4: Time Base and Cursor Accuracies (Mag Off)75
Check Dual Delay Accuracy76
Table 4 5: Time Base Accuracy (Mag On)76
Figure 4 11: Dual Delay Test Setup77
Trigger System Checks78
Check Trigger Sensitivity78
Table 4 6: 500 Ms Dual Delay Accuracy78
Figure 4 12: Trigger Sensitivity Test Setup (One)79
Figure 4 13: Trigger Sensitivity Test Setup (Two)80
Figure 4 14: Trigger Sensitivity Test Setup (Three)81
Figure 4 15: Trigger Sensitivity Test Setup (Four)81
Video Trigger Sensitivity83
Figure 4 16: Video Trigger Test Setup83
Adjustment Procedures85
Requirements for Performance85
Personnel85
Access to Adjustments85
Warm up Period85
Equipment Required86
Figure 5 1: Location of Boards for Adjustments86
Performing the Adjustment Procedures87
Complete Adjustment87
Partial Adjustment87
Adjustment Dependencies87
Adjustment Instructions88
Power Supply Adjustment88
Table 5 1: Adjustments and Dependencies88
CRT Adjustments89
Figure 5 2: CRT Adjustments Calibration Setup89
Low Frequency Output Compensation90
Figure 5 3: Low Frequency Output Compensation Calibration91
Factory Horizontal Cal92
Figure 5 4: Horizontal Adjustments (One)93
Figure 5 5: Horizontal Adjustments (Two)93
Figure 5 6: Horizontal Adjustments (Three)94
Figure 5 7: Horizontal Output Calibration Setup95
Factory Vertical Cal96
Figure 5 8: Factory Vertical Calibration Setup97
Figure 5 9: External Trigger Calibration Setup97
Figure 5 10: Vertical Adjustments98
High Frequency Step Response99
Figure 5 11: Adjusting Vertical Gain and Centering99
Attenuator Compensation100
Figure 5 12: High Frequency Step Response Test Setup100
Figure 5 13: Attenuator Compensation Test Setup101
Vertical Gain Adjust (Cabinet On)102
Figure 5 14: Display Driver Board Adjustment Locations104
Figure 5 15: Analog Board Adjustment Locations105
Figure 5 16: Power Supply Adjustment Location106
Figure 5 17: Location of J205 (CAL-DIS) on the CPU Board107
Maintenance Information109
Before Servicing109
Tektronix Service109
Warranty Service109
Repair or Calibration Service110
Self Service110
Preventing ESD110
Table 6 1: Relative Susceptibility to Static Discharge Damage111
Inspection and Cleaning113
General Care113
Inspection and Cleaning Procedures113
Inspection Exterior114
Cleaning Procedure Exterior114
Table 6 2: External Inspection Check List114
Cleaning Procedure Interior115
Cleaning the CRT Implosion Shield115
Removal and Installation Procedures117
Preparation Please Read117
Cable Removal117
General Instructions118
Summary of Procedures118
Figure 6 1: Oscilloscope Orientation118
Table 6 3: Tools Required for Module Removal119
Figure 6 2: Cabinet and Front Panel Mounted Modules120
Figure 6 3: Internal Modules121
Line Cord and Line Fuse122
Line Cord122
Figure 6 4: Cables and Cable Routing122
Line Fuse123
Front Panel Knobs and Shafts123
Figure 6 5: Line Fuse and Line Cord Removal123
Removing Front Panel Knobs and Shafts124
Installing Front Panel Knobs and Shafts124
Figure 6 6: Knob and Shaft Removal124
Feet, Rear Cover, and Cabinet125
Figure 6 7: Rear Cover, Cabinet, and Feet Removal125
Rear Cover126
Cabinet126
Replacing the Front Feet126
Front Panel Trim, Menu and Power Buttons, EMI Gasket126
Removing the Front Trim126
Menu Buttons and Elastomer127
Power Button Replacement127
Installing the Front Trim127
Installing the EMI Gaskets128
Figure 6 8: Trim Ring and Menu Buttons Removal128
A62 Front Panel Module Removal129
Figure 6 9: EMI Gasket Installation129
Front Panel Module Disassembly/Assembly130
Figure 6 10: A62 Front Panel Module Removal130
Figure 6 11: Disassembly of Front Panel Assembly131
Reassembly of the Front Panel Module132
Figure 6 12: Front Panel Ground Spring132
Menu Flex Circuit Replacement133
Figure 6 13: Menu Flex Circuit Board Removal133
A1 Analog Board134
Display Driver Board (A3)135
Figure 6 14: A1 Analog Board Removal135
Figure 9 5: A1 Analog Board135
CRT Implosion Shield136
Figure 6 15: Location of Display Driver Board136
Figure 6 16: CRT Implosion Shield Removal137
Figure 6 17: Fan Mount Removal138
Figure 6 18: Fan and Fan Mount Removal139
Figure 6 19: CRT Rear Bracket and Ground Wire141
Figure 6 20: CRT Removal143
Figure 6 21: Removing the CRT Front Bracket145
Figure 6 22: Removing the Display Control Board146
Figure 6 23: Power Button Shaft Disconnect147
Figure 6 24: Power Supply Removal147
Table 6 4: Equipment Required for Troubleshooting149
Table 6 5: Symptom Matrix150
Figure 6 25: A5 CPU Board Troubleshooting Procedure152
Figure 6 26: A1 Analog Board Troubleshooting Procedure153
Figure 6 27: A3 Display Driver Board Troubleshooting Procedure155
Figure 6 28: A62 Front Panel Module Troubleshooting Procedure157
Figure 6 29: A2 Display Control Board Troubleshooting Procedure158
Table 7 1: International Power Cords161
Figure 9 1: Graphic Items and Special Symbols Used in this194
Figure 9 2: Circuit Board Component Locator Diagram Key194
Figure 9 3: Semiconductor Lead Configurations195
Figure 9 4: Locating Components on Circuit Board or Schematic196
Figure 9 6: A2 Display Control Board201
Figure 9 7: A3 Display Driver Board203
Figure 9 8: A4 Front Panel Board205
Figure 9 9: A5 Processor Board207
Figure 9 10: A63 Power Supply209
Figure 10 1: Cabinet and Rear261
Figure 10 2: Front Panel Assembly263
Figure 10 3: Chassis265
Figure 10 4: Circuit Boards267
Figure 10 5: Accessories268

Tektronix TAS 465 - Figure 3 1: Block Diagram

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