Keysight NFA Series Noise Figure Analyzers Service Guide 311
Power Supply/Midplane Troubleshooting
A6 Power Supply Basic Troubleshooting (Cover On)
It is possible that some portion of the initial troubleshooting check may fail.
Chapter 2 should also be referenced if this is the case. As an example, the A15
Front End Control Assembly may be pulling down the +15 volt supply that is
used for the probe power on the front panel. Chapter 2 describes the entire
instrument boot process, from initial power on to a successful signal analyzer
sweep. If any portion of the boot process fails, Chapter 2 describes a
step-by-step troubleshooting procedure to help isolate the root cause of the
failure.
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