Keysight N9038A MXE Service Guide 253
RF Downconverter Section
RF Downconverter Section Troubleshooting
Signal Path Verification
Low Band Signal Path (20 Hz to 3.6 GHz)
1. Remove the instrument dress cover (MP24) and top brace (MP10). Refer to
Chapter 18, “Assembly Replacement Procedures.” for instructions on
removing these covers.
2. Remove the hardware that attaches the front frame assembly to the
chassis and slide it away from the rest of the instrument, but do not
disconnect W8 which connects it to the A8 Motherboard assembly. Refer
to Chapter 18, “Assembly Replacement Procedures.” for instructions on
removing the front frame assembly.
3. Referring to Figure 6-17 or Figure 6-18, disconnect W14 from the A13 RF
Front End assembly Output (J7).
Before verifying the functionality of the A13 RF Front End assembly make sure that the 1st LO
signal from the A14 LO Synthesizer assembly as well as the 4800 MHz 2nd LO signal from the
A16 Reference assembly are both of the correct frequency and amplitude. Refer to Chapter 7,
“L.O. Synthesizer.” and Chapter 9, “Reference Assembly.” for detailed information on
how to verify these signals.
If there is a particular frequency of interest use that instead of the 100 MHz used in this example.
Be aware that the gain at higher frequencies in low band will have a slightly lower gain than that
shown in this example.
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