Chapter 4 237
Troubleshooting the Analyzer
Isolating an RF, LO, IF, or Video Problem
If the signal is off frequency in spans <10 MHz
only
1. Perform all of the internal service-diagnostic routines. Refer to
“Using the Internal Service-Diagnostic Routines” in this chapter.
2. For analyzers equipped with an A25 counterlock assembly only:
Disconnect the A25 counterlock assembly, perform the
FREQ CAL
calibration routine, then operate the analyzer as an unlock
instrument.
If the analyzer is corrected, suspect the A25 counterlock assembly.
If the signal displays in low band only
This symptom only applies to the 8592L, 8593E, 8594E, 8594L, 8594Q,
8595E, and 8596E spectrum analyzers.
Perform all of the internal service-diagnostic routines. Refer to “Using
the Internal Service-Diagnostic Routines” in this chapter.
If the A7 Analog Interface board assembly appears to be functioning
properly, see the appropriate section of Chapter 6 for your analyzer.
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