Keithley 2425 Service Manual page 10

Troubleshooting ....................................................................... 4-13
Display board checks ........................................................ 4-13
Power supply checks ......................................................... 4-14
Digital circuitry checks ..................................................... 4-15
Analog circuitry checks .................................................... 4-16
Battery replacement ................................................................. 4-16
Battery replacement precautions ....................................... 4-17
Battery replacement procedure ......................................... 4-17
No comm link error .................................................................. 4-18
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
Analog board removal ................................................................ 5-5
Digital board removal ................................................................ 5-6
Front panel disassembly ............................................................. 5-7
Removing power components .................................................... 5-7
Power module removal ....................................................... 5-7
Instrument re-assembly .............................................................. 5-8
6 Replacement Parts
Introduction ................................................................................ 6-2
Parts lists .................................................................................... 6-2
Ordering information ................................................................. 6-2
Factory service ........................................................................... 6-2
Component layouts .................................................................... 6-2
A Specifications
Accuracy calculations ............................................................... A-6
Measurement accuracy ...................................................... A-6
Source accuracy ................................................................. A-6