4 Service Information
4.1 Introduction......................................................................................................................................................... 4-1
4.2 Handling and cleaning precautions..................................................................................................................... 4-1
4.2.1 Handling precautions .................................................................................................................................. 4-1
4.2.2 Soldering precautions.................................................................................................................................. 4-2
4.3 Performance verification..................................................................................................................................... 4-2
4.3.1 Environmental conditions ........................................................................................................................... 4-2
4.3.2 Recommended equipment........................................................................................................................... 4-2
4.3.3 Scanner card connections............................................................................................................................ 4-2
4.3.4 Reference junction test................................................................................................................................ 4-2
4.3.5 Path resistance tests..................................................................................................................................... 4-4
4.3.6 Contact potential tests................................................................................................................................. 4-5
4.3.7 Isolation tests............................................................................................................................................... 4-8
4.4 Calibration......................................................................................................................................................... 4-10
4.4.1 Calibration with thermistor probe............................................................................................................. 4-10
4.4.2 Calibration with thermocouple wire ......................................................................................................... 4-11
4.5 Special handling of static-sensitive devices...................................................................................................... 4-13
4.6 Principles of operation ...................................................................................................................................... 4-13
4.6.1 Block diagram........................................................................................................................................... 4-13
4.6.2 Relay control............................................................................................................................................. 4-14
4.6.3 Switching circuits...................................................................................................................................... 4-14
4.6.4 Power-on safeguard................................................................................................................................... 4-14
4.6.5 Reference junction .................................................................................................................................... 4-14
4.7 Troubleshooting ................................................................................................................................................ 4-14
4.7.1 Troubleshooting equipment ...................................................................................................................... 4-14
4.7.2 Troubleshooting access............................................................................................................................. 4-14
4.7.3 Troubleshooting procedure ....................................................................................................................... 4-15
4.8 Scanner card modification ................................................................................................................................ 4-15
5 Replaceable Parts
5.1 Introduction......................................................................................................................................................... 5-1
5.2 Parts lists ............................................................................................................................................................. 5-1
5.3 Ordering information .......................................................................................................................................... 5-1
5.4 Factory service.................................................................................................................................................... 5-1
5.5 Component layout and schematic diagram......................................................................................................... 5-1
A Thermocouple Basics
A.1 Definitions.......................................................................................................................................................... A-1
A.2 Theory................................................................................................................................................................ A-1
A.3 Measurement procedure..................................................................................................................................... A-2
A.4 Measuring example............................................................................................................................................ A-2
B Thermocouple Conversion Tables
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