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Analog/Digital IF Troubleshooting
40 MHz BW IF Section
A3 Digital IF Troubleshooting
Verifying the 22.5 MHz Input Power
1. Perform an instrument shutdown.
2. Remove the cover of the analyzer. Refer to Chapter 14, “Assembly
Replacement Procedures” in this service guide.
3. Turn the instrument over so that the bottom side of the analyzer is facing
up.
4. Turn on the analyzer and wait for the instrument to complete the boot up
process.
5. Press System, Alignments, Auto Align, Off
6. Press Input/Output, RF Calibrator, 50 MHz
7. Verify the 50 MHz signal is at −25 dBm by pressing FREQ, 50 MHz, SPAN,
1MHz, 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 Chapter 4, “RF Section Troubleshooting” in this service guide.
8. To continue verifying press SPAN, Zero Span. Verify the input attenuator
on the analyzer is set to 10 dB. Look near the top of the display near the
center and verify Atten: 10 dB is visible. If needed change the input
attenuator by pressing AMPTD, Attenuation, 10 dB on the analyzer.
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