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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
iii
Содержание 2001-TCSCAN
Страница 1: ...Contains Operating and Servicing Information Model 2001 TCSCAN Scanner Card Instruction Manual...
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