4 Troubleshooting
Introduction ................................................................................ 4-2
Repair considerations ................................................................. 4-2
Power-on self-test ...................................................................... 4-2
Front panel tests ......................................................................... 4-3
KEY test .............................................................................. 4-3
DISP test ............................................................................. 4-3
Principles of operation ............................................................... 4-4
Power supply ....................................................................... 4-4
Display board ...................................................................... 4-6
Digital circuitry ................................................................... 4-6
Analog circuitry .................................................................. 4-8
Troubleshooting ....................................................................... 4-10
Display board checks ........................................................ 4-10
Power supply checks ......................................................... 4-11
Digital circuitry checks ..................................................... 4-12
Analog signal switching states ................................................. 4-13
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
Changing trigger link lines ......................................................... 5-4
Motherboard removal ................................................................. 5-5
Front panel disassembly ............................................................. 5-6
Main CPU firmware replacement .............................................. 5-7
Removing power components .................................................... 5-8
Power transformer removal ................................................. 5-8
Power module removal ....................................................... 5-8
Instrument re-assembly .............................................................. 5-9
6 Replaceable Parts
Introduction ................................................................................ 6-2
Parts lists .................................................................................... 6-2
Ordering information ................................................................. 6-2
Factory service ........................................................................... 6-2
Component layouts .................................................................... 6-2
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