Agilent Technologies N9039A Service Manual page 40

Troubleshooting
Potential Problems During Boot Process
Figure 2-3 A7 Midplane Board - Test Point 518/Power_On LED
5. Turn the instrument power on from the front panel On/Off button and view the
6. Do all of the red power supply LEDs along the top of the A7 Midplane board
Before replacing the power supply, verify the midplane and motherboard
NOTE
interconnects are mechanically secure.
40
status of the Power_On LED, as shown in
Does the Power_On LED come on? (Test Point 518 should also go to 0 VDC)
If yes:
Proceed to step 6.
If not:
After verifying that the connections from the front panel On/Off button
back to the A4 Processor board are not at fault, replace the A4 Processor
board.
go off when the power is turned on?
If yes:
After verifying that the connections from the front panel On/Off button
back to the A4 Processor board are not at fault, replace the A4 Processor
board.
If not:
Replace the A6 Power Supply assembly.
Figure 2-3.
Chapter 2