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Analog/Digital IF Troubleshooting
40 MHz BW IF Section
Verifying the 22.5 MHz Output Power
1. Perform an instrument shutdown.
2. Turn the instrument over so the bottom side of the analyzer is facing up.
3. Turn on the analyzer and wait for the instrument to complete the boot up
process.
4. Press System, Alignments, Auto Align, Off.
5. Press Input/Output, RF calibrator, 50 MHz.
6. 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.
7. 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 that Atten: 10 dB is visible. If needed change the input
attenuator by pressing AMPTD, Attenuation, 10 dB on the analyzer.
8. Refer to Figure 6-13, carefully disconnect the W41 cable at A3J19.
Figure 6-13 A3 Digital IF Cables
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