Chapter 2 49
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 CXA 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 A3 CPU board
assembly. This signal is routed through the A6 Midplane board and is then
buffered on the A7 Motherboard before being sent to the A1A2 Front Panel
Interface board. Of course, the power for this all originates with the A5 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
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 the
Chapter 13, “Assembly Replacement Procedures,” on page 225 in this manual.
3. Referring to Figure 2-3, verify the +5.1V standby LED on the A6 Midplane
board is on.
Figure 2-3 A6 Midplane Board +5.1V LED
A9, L.O. Board
plugs into J21
A5, Power Supply plugs
into J101 and J102
A4, CPU Assembly plugs into
J201, J202, J203 and J204
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