Service Guide 5-19
8719ET/20ET/22ET Power Supply Troubleshooting
8719ES/20ES/22ES Intermittent Problems
RF Network Analyzers
Intermittent Problems
PRESET states that appear spontaneously (without pressing
) typically signal a power supply or A7 CPU problem.
Since the A7 CPU assembly is the easiest to substitute, do so. If the problem ceases,
replace the A7. If the problem continues, replace the A15 preregulator assembly.
Preset
Preset
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