Tektronix 2445A - Page 280

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2445A/2455A Service

A B

H J

T1020

+-A3

Figure 10-11.

A2-Regulator

and

A3-lnverter

boards.

Main Page

Table of Contents3
List of Illustrations5
List of Tables6
Operators Safety Summary7
Servicing Safety Summary8
Specification9
Introduction9
Performance Conditions9
Mechanical Characteristics26
Environmental Requirements27
Operating Information30
Safety30
Line Voltage Selection30
Line Fuse30
Power Cord30
Instrument Cooling30
Start-Up31
Repackaging for Shipment31
Power Cord and Voltage Data32
Theory of Operation33
Introduction33
Preparation79
Test Equipment Required80
Vertical82
Accuracy Limits86
Accuracy Limits88
Triggering94
CH 1 or CH 2 Triggering Conditions95
CH 3 or CH 4 Triggering Conditions96
Horizontal99
Settings for a and B Timing Accuracy Checks101
Delta Time Display Accuracy104
Delayed Sweep Delta Time Accuracy105
Counter/Timer/Trigger Checks106
HORIZONTAL (Cont)111
Calibrator, External Z-Axis and Gate Outputs113
Additional Functional Verification115
Word Recognizer Checks117
Data Setup Time Checks118
Data Hold Time Checks119
Minimum Clock Pulse Width Checks119
Delay from Selected Edge to WORD RECOG out Checks120
Word Recognition Delay120
Adjustment Procedure122
Introduction122
Power Supplies123
Power Supply Voltage and Ripple Tolerances124
Crt Adjustments125
Dac Ref, Ch 1 and Ch128
Input Capacitance, and Vertical Readout Jitter Adjustments128
Automatic Calibration131
Response Adjustments131
Cal 01-Horizontal131
Horizontal Timing133
Horizontal Timing134
Cal 02-Vertical135
Vertical Calibration Signals135
Cal 03-Triggering136
Vertical Calibration Signals136
Cal 04-Ch 2 Delay Enable/Disable137
CAL 05-Set HRS on and PWR ON/OFF CYCLES138
Cal 06-Vertical Transient Response138
Cal O7-Readout Centering and Gain141
Dynamic Centering, DC Balance, and X-Y Phase Differential Adjustments142
Maintenance145
Static-Sensitive Components145
Susceptibility to Static Discharge Damage145
Preventive Maintenance146
Introduction146
General Care146
Inspection and Cleaning146
External Inspection Check List146
Internal Inspection Check List147
Lubrication148
Semiconductor Checks148
Periodic Readjustment148
Troubleshooting149
Introduction149
Troubleshooting Aids149
Troubleshooting Equipment150
Troubleshooting Techniques150
Diagnostic Routines153
Sequence of Diagnostic Tests155
Sequence of Exerciser Routines156
Kernel Test Failure Codes157
Front-Panel LED Option Codes157
Front-Panel LED Device Codes158
Potentiometer Codes and Values (Exerciser 01)160
Pots and Switches Column and Row Code Definitions161
NOP Test Data163
Corrective Maintenance164
Introduction164
Maintenance Precautions164
Obtaining Replacement Parts164
Maintenance Aids164
Maintenance Aids165
Transistors, Integrated166
Circuits166
Removal and Replacement168
Instructions168
Options177
Introduction177
Power Cord Options177
Option 1R177
Option 01177
Option 05178
OPTIONS 06 and 09178
Option 10178
Option 11178

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Tektronix 2445A - Page 280

Table of Contents

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