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n9010a Input Overload, ADC over range" (error 1414)

Question asked by joec on Apr 8, 2016
We have an EXA n9010a that is receiving an "Input Overload; ADC over range" (error #1414), whenever the LO is visible on the display.

We are seeing this error with NO INPUT or anything even hooked up to input at center frequencies below 22 kHz or so.  If you do inject a signal, the measurements also appear to be off by 10 dB or so down there.  

I also noticed that when you sweep low frequency spans it appears the LO level is very high (off the screen). 

We upgraded to the latest firmware A.17 however, the same problem exists.

Thoughts?  

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