Keysight Technologies N9030B, Service Manual

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62 N9030B PXA Signal Analyzer Service Guide
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
It should be noted that the FAULT_L status line can also be triggered by an
over voltage or an over temperature condition in the A6 Power Supply
assembly.
Is the FAULT_L LED on? (Test Point 508 at a TTL low level)
If not:
Replace the A6 Power Supply assembly.
If yes:
Remove different assemblies from the instrument one at a time to
see if one of them can be identified as overloading the A6 Power
Supply assembly.
If, when a particular assembly is removed, the power supplies will
now come on, replace that assembly.
If no assembly can be found that is causing the overcurrent
condition, replace the A6 Power Supply assembly.
Figure 2-6 A7 Midplane Board - Test Point 508/FAULT_L LED
Before replacing the power supply, verify the midplane and motherboard
interconnects are mechanically secure.