44 Keysight N9038A MXE Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
Figure 2-3 A7 Midplane Board +5.1VSB LED
Is the +5.1VSB LED on the A7 Midplane board on?
If yes:
After verifying that the connections from the yellow front
panel Standby LED back to the A4 Processor board are not
at fault, replace the A4 Processor board.
If not:
Replace the A6 Power Supply assembly.
Most DC power supplies come from the A6 Power Supply assembly. However, the most
convenient measurement location for all the DC supplies is the A7 Midplane. All power supply
LED's are accessible once the instrument cover has been removed.
Before replacing the power supply, verify the midplane and motherboard interconnects are
mechanically secure.
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