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Analog/Digital IF Troubleshooting
≥ 85 MHz BW IF Section
Verify the 2400 MHz Frequency Reference
1. Turn the instrument off.
2. Remove the instrument cover. Refer to Chapter 14, “Assembly
Replacement Procedures” in this service guide.
3. Turn on the N9020A Signal Analyzer and wait for the instrument to
complete the boot up process.
4. Press System, Alignments, Auto Align, Off.
5. Press Mode, IQ Analyzer
6. Press Meas, Complex Spectrum
7. Press Input/Output, RF Calibrator, 50 MHz
8. Press Mode Setup, IF Path, 85, 125, or 140 MHz
9. Verify the 50 MHz signal is at −25 dBm on the analyzer display by pressing
FREQ, 50 MHz, SPAN, 1 MHz, Peak Search on the N9020A. The marker
readout should be 50 MHz at −25 dBm ±3 dB. If this reference signal is
measuring incorrectly, see Chapter 4, “RF Section Troubleshooting” in this
service guide.
10.Connect a known good spectrum analyzer to A25J302. Verify reference
signal at 2400 MHz at a level of −30 dBm.
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