Keithley 6517 - Page 9

5 Troubleshooting
5.1 Introduction ........................................................................................................................................................ 5-1
5.2 Repair considerations ......................................................................................................................................... 5-1
5.3 Power-on test ...................................................................................................................................................... 5-2
5.4 Front panel tests ................................................................................................................................................. 5-2
5.4.1 KEYS test ................................................................................................................................................... 5-2
5.4.2 DISPLAY PATTERNS test ....................................................................................................................... 5-2
5.4.3 Character set test ........................................................................................................................................ 5-2
5.5 Principles of operation ....................................................................................................................................... 5-2
5.5.1 Display board ............................................................................................................................................. 5-4
5.5.2 Power supply .............................................................................................................................................. 5-4
5.5.3 Digital board .............................................................................................................................................. 5-6
5.5.4 Analog board .............................................................................................................................................. 5-7
5.6 Circuit board checks ......................................................................................................................................... 5-10
5.6.1 Display board checks ............................................................................................................................... 5-10
5.6.2 Power supply checks ................................................................................................................................ 5-11
5.6.3 Digital board checks ................................................................................................................................. 5-12
5.6.4 Analog board checks ................................................................................................................................ 5-13
6 Disassembly
6.1 Introduction ........................................................................................................................................................ 6-1
6.2 Handling and cleaning precautions .................................................................................................................... 6-1
6.2.1 PC board handling ...................................................................................................................................... 6-1
6.2.2 Solder repairs ............................................................................................................................................. 6-2
6.3 Special handling of static-sensitive devices ....................................................................................................... 6-2
6.4 Case cover removal ............................................................................................................................................ 6-2
6.5 PC board removal ............................................................................................................................................... 6-2
6.5.1 Digital board removal ................................................................................................................................ 6-3
6.5.2 A/D converter board removal ..................................................................................................................... 6-3
6.5.3 Analog board removal ................................................................................................................................ 6-3
6.6 Front panel disassembly ..................................................................................................................................... 6-4
6.7 Main CPU firmware replacement ...................................................................................................................... 6-4
6.8 Instrument re-assembly ...................................................................................................................................... 6-5
6.9 Assembly drawings ............................................................................................................................................ 6-5
7 Replaceable Parts
7.1 Introduction ........................................................................................................................................................ 7-1
7.2 Parts lists ............................................................................................................................................................ 7-1
7.3 Ordering information ......................................................................................................................................... 7-1
7.4 Factory service ................................................................................................................................................... 7-1
7.5 Component layouts ............................................................................................................................................ 7-1
A Specifications
B Calibration Messages
C Calibration Command Summary
iii