Keysight Technologies N9040B UXA Signal Analyzer Service Guide 51
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Potential Problems During Boot Process
This section describes potential problems that may occur if there is an internal
hardware issue that prohibits the instrument from completing a full boot up to
the spectrum analyzer application.
Yellow Standby LED Does Not Illuminate
Control of the yellow front panel Standby LED comes from the A4 Processor
board assembly. This signal is routed through the A7 Midplane board 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
Standby 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.
If the instrument turns on and operates properly but the yellow Standby 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 Standby LED will only turn on when the instrument is connected to an
AC power source that has a voltage level and frequency of that specified
for the instrument. 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 347 in this
manual.
3. Referring to Figure 2-3, verify the +5.1V_STBY LED on the A7 Midplane
board is on (green).
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