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2. Look for the 100 MHz comb-generator signal to the right of the
local oscillator signal. When COMB GEN ON OFF is OFF, this
signal has an amplitude of approximately –8 dBm and the
100 MHz harmonics are less than –20 dBc.
Press the following keys.
AUX CTRL
COMB GEN ON OFF
3. When the comb-generator output amplifier is enabled, the
amplitude of the 100 MHz signal and the 100 MHz harmonics
increase. The 100 MHz signal amplitude increases to
approximately +12 dBm.
If the signal amplitude does not increase, check that the
comb-generator control line from the A7 analog interface
assembly is switching correctly.
Refer to
Figure
Overall Block Diagram for your analyzer, for the
comb-generator control voltage values.
If the A7 control line is correct, suspect the A3A11
step-recovery diode or the A3A1 comb generator.
Refer to
Figure
9-2,
Figure
Diagram for your analyzer, for more information.
COMMAND ERROR:_ _ _ (U)
The specified programming command is not recognized by the analyzer.
Related Assemblies
A16 processor/video assembly.
Troubleshooting Hints
Refer to the 8590 E-Series and L-Series Spectrum Analyzers, and 8591C
Cable TV Analyzer Programmer's Guide for a description of legal
commands.
CONF TEST FAIL (U)(H)
Indicates that the confidence test failed. If this happens, ensure that
the CAL OUT connector is connected to the analyzer input, perform the
CAL FREQ &TD routine, and then perform the confidence test
again. This message also sets SRQ 110.
Troubleshooting Hints
The confidence test routine identifies the analyzer function that failed
the test. Refer to the
information.
Chapter 14
(On)
9-2,
Figure
9-3, or
9-3, or
Figure
9-4, RF Section Overall Block
description in
CONF TEST
Analyzer Messages
Interpreting Analyzer Messages
Figure
9-4, RF Section
Chapter 13
for more
631
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Troubleshooting
