Keysight Technologies Option 503 Service Manual page 64

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
5. Referring to
If yes:
If yes:
If not:
If not:
Before replacing the power supply, verify the midplane and motherboard
interconnects are mechanically secure.
Figure 2-7 A7 Midplane Board - Fan_P Failure LED / Test Point 522
64
Figure 2-7, verify that the Fan_P Failure LED on the A7
Midplane board is off.
Is the Fan_P LED off?
Measure the voltage level at Test Point 522 on the A7 Midplane
board.
Is the Test Point 522 voltage between +7 and +15 VDC?
Proceed to
Replace the A6 Power Supply assembly.
Replace the A6 Power Supply assembly.
step 6.
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