56 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Figure 2-5 A7 Midplane Board LED’s - Front View
5. If any of the LED’s illustrated above are dim or not turned on, an
over-current condition is the most probably cause.
6. Power cycle the analyzer off and lift the A14 L.O, Synthesizer, A21
Wideband Analog I.F. (Opt B2X and B5X), A16 Reference, and A15 Front
End Controller.
7. Turn the analyzer power on and view the LED’s.
8. If the LED’s are all turned on, one of the lifted assemblies is the cause.
9. Continue troubleshooting until the assembly casing the over-current
condition is determined.
10.If one or more LED’s is still dim or not turned on, continue removing
measurement assemblies to isolate the over-current condition.
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