Symmetricom 5071A - Contents

Contents
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1.0.1.1.0 DC Input 1 and 2 Power Steering Circuit Check...............................................38
1.0.1.1 Digital Supply Voltage Check ..............................................................................38
1.0.1.2 A3 Microprocessor Fault ......................................................................................38
1.0.2 DC-Supply Test/Log-Record Examination..............................................................39
1.0.3 Power On Fatal Error Check....................................................................................40
1.0.4 Instrument Self Tests ...............................................................................................40
1.0.5 CBT Warm Up.........................................................................................................40
1.0.6 Servo-Lock Warning State.......................................................................................41
1.0.7 User-Input/Output Checks.......................................................................................41
1.0.8 5071A Profiling .......................................................................................................42
1.0.9 Delayed Failures, Warnings, and Messages.............................................................44
Power-on Fatal-Error Diagnostic Tree (Subsection 1) .....................................................45
Self Test Diagnostic Tree (Subsection 2) .........................................................................47
Warm-up And Fatal Error Diagnostic Tree (Subsection 3)..............................................49
Warning Message Diagnostic Tree (Subsection 4)...........................................................57
I/O Diagnostic Tree (Subsection 5) ..................................................................................60
CBT Performance Evaluation (Subsection 6)...................................................................61
Advisory Messages (Subsection 7)...................................................................................65
Functional-Group-Diagnostic Trees (Diagnostic Section 2) ............................................... 66
Power-Supply Diagnostic Tree (Functional Group Subsection 1)....................................67
Analog-Signal Chain Diagnostic Tree (Functional-Group Subsection 2) ........................74
RF-Chain Diagnostic Tree (Functional-Group Subsection 3) ..........................................77
C-Field Diagnostic Tree (Functional-Group Subsection 4)..............................................81
Assembly/Module Diagnostic Trees (Diagnostic Section 3)...............................................82
A2 CBT Controller Diagnostic Tree (A/M Subsection 1)................................................83
A2 Hot-Wire Ionizer Diagnostic Tree ..............................................................................84
A2 Thermistor Diagnostic Tree ........................................................................................86
A2-Mass-Spectrometer Diagnostic Tree...........................................................................88
A2 Cesium-Oven Diagnostic Tree....................................................................................90
A5 Diagnostic Tree (A/M Subsection 2) ..........................................................................92
A8 Diagnostic Tree (A/M Subsection 3) ..........................................................................95
A9 Diagnostic Tree (A/M Subsection 4) ..........................................................................99
A10 Diagnostic Tree (A/M Subsection 5) ......................................................................101
A15 Diagnostic Tree (A/M Subsection 6) ......................................................................107
A16 Diagnostic Tree (A/M Section 7)............................................................................111
A18 Diagnostic Tree (A/M Subsection 8) ......................................................................116
A19 Diagnostic Tree (A/M Subsection 9) ......................................................................120
3. Theory of Operation........................................................................................................ 125
Introduction .......................................................................................................................125
Basic Operating Principles..............................................................................................125
Simplified Functional Description..................................................................................126
Functional Block Descriptions........................................................................................126
A1 Motherboard Circuit Description..............................................................................126
Simplified Functional Description.....................................................................................127
Instrument Control Block ...............................................................................................128
Reference Oscillator/RF chain Block .............................................................................128
Cesium Beam Tube Block ..............................................................................................128
Analog Signal Chain Block ............................................................................................129
Input/Output Block .........................................................................................................129
Power Supply Block .......................................................................................................129