Keysight N9038A - Page 47

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