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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.