46 Keysight N9038A MXE Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
Figure 2-4 A7 Midplane Board - Test Point 518/POWER_ON_L LED
5. Turn the instrument power on from the front panel On/Off button and view
the status of the POWER_ON_L LED, as shown in Figure 2-4.
Does the POWER_ON_L LED come on? (Test Point 518 should also go to
0 VDC)
If yes:
Proceed to step 6.
If not:
Verify the connection between the front panel On/Off
switch and the A4 Processor assembly by checking the
status of the POWER_SW_L control line when the front
panel On/Off button is both pressed and released. This can
be monitored by measuring the voltage at Test Point 520,
as shown in Figure 2-5.
With the On/Off button released this should measure a TTL
high level, and with the button pressed it should measure a
TTL low level. The A4 Processor board assembly provides
the voltage and the switch on the front panel pulls it low
when it is pressed.
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