Keysight Technologies Option 503 Service Manual page 61

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Figure 2-5 A7 Midplane Board - Test Point 520/POWER_SW_L
6. Do all of the red power supply LEDs along the top of the A7 Midplane
If yes:
If not:
7. To verify that the A6 Power Supply is not in an over current condition,
N9030A PXA Signal Analyzer Service Guide
Measure the voltage at Test Point 520 and compare the results to
that in Table 2-1.
Table 2-1
Front Panel Switch
Released
High
High
Low
board go off when the power is turned on?
Replace the A4 Processor board.
Proceed to step
check the status of the FAULT_L status line by measuring the voltage level
at Test Point 508 or viewing the FAULT_L LED, as shown in
Test Point 520 Verification
Most Probably Cause
Pressed
Low A4 Processor
High Front Panel Switch
Low A4 Processor
7.
Figure 2-6.
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