Keysight Technologies N9040B UXA Signal Analyzer Service Guide 245
Hardware Options
A22 Wideband Digital IF Troubleshooting
A22 Wideband Digital IF Troubleshooting
Normally failure of this assembly will occur during extensive alignments. Verify
if there are alignment error related to the WBDIF located in the
E:\AlignDataStore\AlignmentHistrory.txt files.
If errors are found related to WBDIF replace the A22 Wideband Digital IF
assembly. To troubleshoot this module set the instrument up as below:
1. Turn on the analyzer and wait for the instrument to complete the boot up
process.
2. Press System, Alignments, Auto Align, Off.
3. Press Mode/Meas, IQ Analyzer (Basic), Complex Spectrum OK.
4. Press Input/Output, RF Calibrator, 50 MHz
5. Press Span, 10 MHz
6. Press Meas Setup, IF Path. Tap IF Path and choose 255 MHz or 510 MHz
from the drop down menu.
7. Verify the 50 MHz signal is at −25 dBm on the analyzer display by pressing
Peak Search on the analyzer. The marker readout should be 50 MHz at
−25 dBm ±3 dB.
8. If this signal is not present, determine if the issue is only present with the
Wideband 255 MHz or 510 MHz path. Press Mode Setup, IF Path, 40 MHz.
If the signal is now present, there is a likely failure of the A22 Wideband
Digital IF or the A21 Wideband Analog IF
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