Keysight NFA Series Noise Figure Analyzers Service Guide 195
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
If the power level is correct, do not reconnect W8 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.
Figure 4-35 Cable W7 at A12 Output
Once the connector is installed, carefully reconnect W8 to make the
measurement. If the power level is incorrect, the most probable cause is the
A12, YTF Preselector.
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