Keysight N9010A EXA Service Guide 57
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Green Power On LED Does Not Illuminate
Control of the green front panel Power On LED comes from the A4 CPU board
assembly. This signal is routed through the A7 Midplane board and is then
buffered on the A8 Motherboard before being sent to the A1A2 Front Panel
Interface board through W1. Of course, the power for this all originates with
the A6 Power Supply Assembly. When the Power On LED does not come on it
could be due to any one of these assemblies. This procedure will help to
determine which one is the cause.
This procedure assumes that the yellow Standby LED does turn on when the
AC power is connected to the rear panel of the instrument. If it doesn't, refer to
the “Yellow Standby LED Does Not Illuminate” section before proceeding.
If the instrument turns on and operates properly but the green Power On LED
does not work then all that will need to be done is to trace where the control
signal for the LED is being lost using the routing information in the preceding
paragraph.
1. The Power On LED will only turn on when the instrument is connected to
an AC source that has a voltage level and frequency of that specified for
the instrument and the front panel On/Off button has been pressed. Before
proceeding verify that these requirements are being met. Refer to the
instrument rear panel for these requirements.
2. Remove the AC power cord and then remove the instrument cover. Refer
to Chapter 15, “Assembly Replacement Procedures”, on page 463 in this
manual.
3. Remove the MP7 Top Brace. Refer to Chapter 15, “Assembly Replacement
Procedures”, on page 463 in this manual.
4. With AC power connected to the rear of the instrument but without
turning it on, leaving it in standby mode, measure the voltage at the top
side of R867 of the A7 Midplane board assembly. See Figure 2-4 for R867
location.
Does the voltage at R867 measure 5 VDC?
If yes:
Proceed to step 5.
If no:
Replace the A6 Power Supply assembly.
Before replacing the power supply, verify the midplane and motherboard interconnects are
mechanically secure.
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