Keysight Technologies N9040B UXA Signal Analyzer Service Guide 59
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
5. Referring to Figure 2-6, verify that the Fan_P Failure LED on the A7
Midplane board is off.
Is the Fan_P LED off?
If yes:
Measure the voltage level at Test Point 4 on the A7 Midplane board.
Is the Test Point 4 voltage between +7 and +15 VDC?
If yes:
Replace the fan that is not working.
If not:
Replace the A6 Power Supply assembly.
Figure 2-6 A7 Midplane Board - Fan_P Failure LED / Test Point 4
Before replacing the power supply, verify the midplane and motherboard interconnects are
mechanically secure.
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