Keysight N9038A MXE Service Guide 327
Analog & Digital IF
A2 Analog I.F. Troubleshooting
The following troubleshooting instructions for the A2 Analog IF assembly are
broken up into three sections which can be run independently of each other.
They are:
A2 Analog IF Filter Path Switching
This will verify that each filter path is switching in and out properly
with the use of the instrument's internal 50 MHz calibrator signal.
A2 Analog IF Filter Path Passband Shape
This will verify the filter shape of each of the filter paths with the use
of a signal generator tuned to 50 MHz.
A2 Analog IF 25 MHz Filter Path (Option B25 Only)
This will verify the filter path switching and shape for the 25 MHz
filter path with the use of a signal generator tuned to 50 MHz.
A2 Analog IF Filter Path Switching
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. Turn the instrument on and allow it to complete its boot up process.
3. Remove W17 from the A3 Digital IF assembly J19 as shown in Figure 10-2.
Since the A2 Analog IF assembly is not in an easily accessible area of the instrument its
22.5 MHz output will be measured on the other end of the cable coming from this assembly,
which is connected to J19 of the A3 Digital IF assembly.
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