Keysight N9010B EXA Signal Analyzer Service Guide   195
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
If the power level is correct, do not reconnect W8 or W31 at this time. Refer to 
Figure 4-35, disconnect W7 at A12 (1) output and install a connector such 
that the A12 YTF Preselector output can be measured. If the preselector bypass 
hardware is installed, disconnect W33 at A12.
Figure 4-35  Cable W7 at A12 Output
Once the connector is installed, carefully reconnect W8 or W31to make the 
measurement. If the power level is incorrect, the most probable cause is the 
A12, YTF Preselector.