184 Keysight N9038A MXE Service Guide
RF Preselector Section
RF Preselector Section Troubleshooting
Output Signal Routing and Preamplifiers
There are two main signal paths through the output routing of the A21 RF
Preselector Input assembly, and a preamplifier for each, to be verified, as seen
in Figure 5-11.
Figure 5-11 A21 RF Preselector Input Assembly Output Switching
Verifying Output Signal Routing and Preamplifier Gain
1. Remove the instrument dress cover (MP24) and the top brace (MP10).
Refer to Chapter 18, “Assembly Replacement Procedures” for instructions
on removing these covers.
2. Referring to Figure 5-4 and Figure 5-5, remove W33, W35, and W36 from
the A21 RF Preselector Input assembly.
3. Turn the instrument on and allow it to complete its boot up process,
ignoring any error messages.
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