A3 Digital I.f. Troubleshooting - Keysight n9020a Service Manual

Analog/Digital IF Troubleshooting
25 MHz BW IF Section

A3 Digital I.F. Troubleshooting

Verifying the 22.5 MHz Input Power
1. Perform an instrument shut down.
2. Remove the cover of the analyzer. Refer to
3. Turn the instrument over so that the bottom is facing up.
4. Turn on the analyzer and wait for the instrument to complete the boot up
5. Press System, Alignments, Auto Align, Off
6. Press Input, RF Calibrator, 50 MHz
7. Verify the 50 MHz signal is at −25 dBm by pressing FREQ, 50 MHz, SPAN,
8. To continue verifying press SPAN, Zero Span. Verify the input attenuator
If the analyzer is not in 10 dB of input attenuation press AMPTD, Attenuation,
NOTE
10 dB.
Replacement Procedures", on page 435
process.
1 MHz, Peak Search on the analyzer. The marker readout should be 50
MHz at −25 dBm ± 3 dBm. If this reference signal is measuring incorrectly,
see Chapter 4, "RF Section Troubleshooting", on page 137
guide.
on the analyzer is set to 10 dB. (Look near the top of the display near the
center and verify Atten: 10 dB)
Chapter 14, "Assembly
in this service guide.
246
in this service