Keithley 2002, Руководство по ремонту, Страница: 7 / 148

i
1 Routine Maintenance
1.1 Introduction .......................................................................................................................................................... 1-1
1.2 Line fuse replacement .......................................................................................................................................... 1-1
1.3 Current fuse replacement ..................................................................................................................................... 1-2
1.3.1 Front AMPS input fuse .............................................................................................................................. 1-2
1.3.2 Rear AMPS input fuse ............................................................................................................................... 1-3
1.4 Fan filter cleaning ................................................................................................................................................ 1-3
1.5 Firmware updates ................................................................................................................................................. 1-3
2 Troubleshooting
2.1 Introduction ......................................................................................................................................................... 2-1
2.2 Repair considerations ........................................................................................................................................... 2-2
2.3 Power-on test........................................................................................................................................................ 2-2
2.4 Front panel tests ................................................................................................................................................... 2-2
2.4.1 KEYS test................................................................................................................................................... 2-2
2.4.2 DISPLAY PATTERNS Test...................................................................................................................... 2-2
2.4.3 Character set test ........................................................................................................................................ 2-3
2.5 Diagnostics........................................................................................................................................................... 2-3
2.6 Control register bit patterns.................................................................................................................................. 2-3
2.6.1 Control register ICs .................................................................................................................................... 2-3
2.6.2 Normal operation bit patterns .................................................................................................................... 2-3
2.7 Display board checks ........................................................................................................................................... 2-5
2.8 Power supply checks ............................................................................................................................................ 2-5
2.9 Principles of operation ......................................................................................................................................... 2-6
2.9.1 Block diagrams .......................................................................................................................................... 2-6
2.9.2 Display board circuit theory..................................................................................................................... 2-11
2.9.3 Power supply circuit theory ..................................................................................................................... 2-11
2.10 Built-in test overview......................................................................................................................................... 2-12
2.10.1 Using Built-In Test................................................................................................................................... 2-15
2.10.2 AUTOMATIC Testing............................................................................................................................. 2-15
2.10.3 MANUAL Testing ................................................................................................................................... 2-15
2.11 Built-In test documentation................................................................................................................................ 2-17
2.11.1 Memory element tests .............................................................................................................................. 2-18
2.11.2 Digital I/O tests ........................................................................................................................................ 2-19
2.11.3 IEEE-488 bus tests ................................................................................................................................... 2-20
2.11.4 Triggers tests ............................................................................................................................................ 2-21
2.11.5 A/D converter tests................................................................................................................................... 2-23
2.11.6 Integration tests ........................................................................................................................................ 2-27
2.11.7 A/D multiplexer tests ............................................................................................................................... 2-49
2.11.8 Temperature sensor test ........................................................................................................................... 2-51
Table of Contents