Keysight Technologies N9030B Service Manual page 335

Hardware Options
A25 Wideband Analog IF Troubleshooting - Option B2X and B5X
Verify the J18 Output
The J18 output is active only when the 40 MHz IF path is selected.
The following test can be used to assure the W41 cable and the switch on the
A25 Wideband AIF are good.
1. To select the 40 MHz IF path, press Meas Setup, IF Path. Tap IF Path and
2. Turn on the 50 MHz calibrator as explained in the last section. Set the
3. Connect A25J18 to a known good spectrum analyzer. Tune the spectrum
Verify the 2400 MHz Frequency Reference
1. Turn the instrument off.
2. Remove the instrument cover. Refer to
3. Turn on the signal analyzer and wait for the instrument to complete the
4. Press System, Alignments, Auto Align, Off.
5. Press Mode/Meas, IQ Analyzer, Complex Spectrum, OK.
6. Press Input/Output, RF Calibrator, 50 MHz
7. Press Meas Setup, IF Path. Tap IF Path and choose 255 MHz or 510 MHz
8. Verify the 50 MHz signal is at −25 dBm on the analyzer display by pressing
9. Connect a known good spectrum analyzer to A25J3. Verify reference
N9030B PXA Signal Analyzer Service Guide
choose 40 MHz from the drop down menu.
center frequency to 50 MHz. Set the span to 0 Hz.
analyzer to 250 MHz. This port switches the 250 MHz IF that is input to the
A25 Wideband Analog IF to be routed to the A3J15 40 MHz Digital IF. If
this −23 dBm ±3 dB signal is present, you have verified the 250 MHz IF
from the A15J901 Front End Controller. If this signal is not present, verify
the signal is present on A15J901 of the A15 Front End Controller.
Replacement Procedures"
boot up process.
from the drop down menu.
FREQ, 50 MHz, SPAN, 1 MHz, Peak Search on the analyzer. The marker
readout should be 50 MHz at −25 dBm ±3 dB. If this reference signal is
measuring incorrectly, see
(RF/Microwave Analyzers)"
signal at 2400 MHz at a level of + 9 dBm.
Chapter 16, "Assembly
in this service guide.
Chapter 4, "RF Section Troubleshooting
in this service guide.
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