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Analog/Digital IF Troubleshooting
40 MHz BW IF Section
Verifying the 100 MHz Reference Input
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. Refer to Figure 6-21, carefully disconnect W42 or W54 cable at A3J14.
Figure 6-21 A3 Digital IF Cables
8. Connect the W42 or W54 cable to the MMCX female to SMA female
connector. Use an appropriate cable to go from the SMA connector to the
RF input of a functioning spectrum analyzer to verify the 100 MHz
reference frequency and amplitude is correct.
9. Press AMPTD, Ref Level, 20 dBm, Freq, 100 MHz, Span, 1MHz, Peak
Search on the functioning spectrum analyzer.
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