Octagon XE-900, Reference Manual

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Chapter 16: Troubleshooting
If your system is not working properly, check the following items.
No system LED activity
If there is no LED activity, check the following:

Make sure all PC/104 or PC/104 -Plus expansion cards are removed from the
XE–900 SBC. This ensures that other cards are not interacting with the XE–
900 SBC.

Turn the “S” switch Off.

Check all power connections to the XE–900 SBC card.

Measure the supply voltage at the J8 power connector and verify that the
voltage at the XE–900 SBC card is +5V (+/–0.25V).

Make sure your power module pr5V (+/–0.25V) and at least 10A of
current (to meet inrush requirement).
No CRT or flat panel video
If the LEDs appear to be functioning properly, but there is no video activity, check
the following:

Make sure all PC/104 or PC/104 -Plus expansion cards are removed from the
XE–900 SBC. This ensures that other cards are not interacting with the XE–
900 SBC.

Turn the “S” switch Off.

If using a CRT monitor, check the cable and connections going from the J1
connector to the monitor.

If using a flat panel display, check the following:
Check the power and cables going to the flat panel display.
Make sure that the power module has enough current capacity to power both
the XE–900 SBC card and the flat panel.

If an analog monitor is not present or is not displaying the video data correctly,
the system can be booted via the serial console by doing the following:
1. Turn the “S” switch Off and the “V” switch On.
2. Connect the COM port of a host computer running HyperTerminal or some
other terminal software to COM1 on the XE–900 SBC using a serial console
(see page 49.) The serial port settings on the host computer should be
115.2K baud, 8, N, and none.
3. Power up the XE–900 SBC; it will boot using the serial console interface.
Video is present but is distorted