Agilent Technologies N9039A Service Manual page 38

Troubleshooting
Potential Problems During Boot Process
Most DC power supplies come from the A6 Power Supply assembly. However, the
NOTE
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.
Is the +5.1V Standby LED on the A7 Midplane board on?
If yes:
If not:
Before replacing the power supply, verify the midplane and motherboard
NOTE
interconnects are mechanically secure.
38
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.
Replace the A6 Power Supply assembly.
Chapter 2