check the following:
Remove the jumper from the “S” position at W12[1–2] to ensure the
default settings for COM1.
Make sure that your terminal emulator (such as HyperTerminal) on
your PC is set-up properly. Refer to the
Console devices
chapter. Refer
to the HyperTerminal manual for information on setting up
communication parameters.
System generates a BIOS message but locks
up when booting
Remove the jumper from the “S” position at W12[1–2]
and reboot.
Verify that all the necessary boot files exist on the boot device. Copy
any missing files to the boot device.
If no files are missing, overwrite any files which may have become
corrupted. In addition, you may want to format the boot device.
System will not boot from CompactFlash
Many CompactFlash devices as shipped from the factory are not bootable
devices. Refer to
CompactFlash, SDRAM, and battery backup
chapter to
make your CompactFlash bootable.
System locks up on power–up; may or may
not respond to reset switch
A common cause is using a non–Octagon power supply such as a PC
desktop supply. Most of these PC supplies are rated at 5V at 20A or more.
Switching supplies usually requires a 20% load to operate properly, that is,
4A or more. Since a typical Octagon system takes less than 2A, the supply
does not regulate properly. Output drift up to 6–7V and/or 7–8 voltage
spikes have been reported. If the power supply comes up slowly (that is,
longer than 10 ms), the sequencing of ICs on the board may be out of sync,
thus, causing the system to lock up.
Octagon supplies are designed to ramp up fast, discharge fast on power–
down and to regulate properly under a no load condition.
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