Keithley 2520, Руководство по обслуживанию, Страница: 8 / 137

Calibration errors ........................................................................ 2-9
Front panel error reporting .................................................. 2-9
Remote error reporting ........................................................ 2-9
Aborting calibration steps ........................................................... 2-9
Testhead connections ................................................................ 2-10
Front panel calibration .............................................................. 2-10
Remote calibration .................................................................... 2-22
Remote calibration command summary ............................ 2-22
Remote calibration procedure ........................................... 2-23
3 Routine Maintenance
Introduction ................................................................................ 3-2
Line fuse replacement ................................................................. 3-2
4 Troubleshooting
Introduction ................................................................................ 4-2
Safety considerations .................................................................. 4-2
Repair considerations ................................................................. 4-2
Power-on self-test ....................................................................... 4-3
Front panel tests .......................................................................... 4-3
KEYS test ............................................................................ 4-3
DISPLAY PATTERNS test ................................................ 4-3
CHAR SET test ................................................................... 4-4
Principles of operation ................................................................ 4-4
Overall block diagram ......................................................... 4-5
Analog circuits .................................................................... 4-7
Power supply ..................................................................... 4-10
Digital circuitry ................................................................. 4-11
Troubleshooting ........................................................................ 4-13
Display board checks ........................................................ 4-13
Power supply checks ......................................................... 4-14
Digital circuitry checks ..................................................... 4-15
Analog circuitry checks ..................................................... 4-16
No comm link error .................................................................. 4-17
5 Disassembly
Introduction ................................................................................ 5-2
Handling and cleaning ................................................................ 5-2
Handling PC boards ............................................................ 5-2
Solder repairs ....................................................................... 5-2
Static sensitive devices ............................................................... 5-3
Assembly drawings .................................................................... 5-3
Case cover removal .................................................................... 5-4