Fluke PM6690 - Page 54

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6-10 Troubleshooting

Figure 6-9 Oscillogram showing the signal at the interconnection of R156 (R229) and C109 (C140).

Figure 6-10 Oscillogram showing the signal at U3:9 (U3:13).

Main Page

General Information3
Table of Contents5
Safety Instructions7
Caution and Warning Statements8
Grounding8
Operation8
Line Voltage10
Performance Check11
General Information12
Test Equipment12
Preparations12
Front Panel Controls12
Short Form Specification Test14
Rear Inputs/Outputs16
Measuring Functions16
Check of HOLD off Function17
RF Options17
Disassembly19
Removing the Cover20
Fan21
Prescaler Options21
OCXO Options22
Circuit Descriptions23
Version a25
Block Diagram Description26
General26
Block Diagram26
Hardware Functional Description28
Front Unit28
Main Board28
Test Routines32
Version B33
Block Diagram Description34
General34
Block Diagram34
Hardware Functional Description36
Front Unit36
Main Board36
Test Routines40
Corrective & Preventive Maintenance41
Introduction42
Calibration42
Instructions for Firmware Upgrade42
Utility Program43
Fan Replacement43
Other Important Information43
Repair45
Version a47
Troubleshooting48
General48
Power Supply48
Input Amplifiers52
Timebase Reference Circuits56
Prescalers59
Microprocessor & Memories59
Microprocessor Bus & Interfaces65
Measuring Logic71
Version B75
Troubleshooting76
General76
Power Supply76
Input Amplifiers80
Timebase Reference Circuits84
Prescaler87
Microprocessor & Memories87
Microprocessor Bus & Interfaces93
Measuring Logic99
Safety Inspection and Test after Repair103
General Directives103
Calibration Adjustments105
Calibration105
General Principles106
The Calibration Submenu107
Frequency Reference107
Voltage Reference109
Calibration Subsystem Command Reference110
Adjustments115
Preparations115
Input Amplifiers116
Power Supply117
External Reference Input117
Internal Reference Oscillators118
RF Input 3 Ghz118
Replacement Parts119
Introduction120
Mechanical Parts121
Main Board, Version a123
Front Unit132
Main Board, Version B134
Parts Unique to Version a144
Parts Unique to Version B144
Parts Common to Version a and Version B144
Schematic Diagrams147
How to Read the Diagrams148
Version a149
Version B171
Appendix193
How to Replace Surface Mounted Devices194
Glossary195
Index197

Fluke PM6690 - Page 54

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