Keysight N9038A, Руководство по обслуживанию

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Keysight N9038A MXE Service Guide 47
Boot Up and Initialization
Potential Problems During Boot Process
Measure the voltage at Test Point 520 and compare the
results to that in Table 2-1 .
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
board go off when the power is turned on?
If yes:
Replace the A4 Processor board.
If not:
Proceed to step 7 .
7. To verify that the A6 Power Supply is not in an over current condition,
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 Figure 2-6 .
Table 2-1 Test Point 520 Verification
Front Panel Switch Most Probably Cause
Released Pressed
High Low A4 Processor
High High Front Panel Switch
Low Low A4 Processor