General Description Of Led Failure Codes - HP 340 Series Service Manual

The Boot ROM will time out after approximately one minute and will then continue into the
boot scanner. This allows time for the display to warm up and for the user to read the error
messages. These failures are usually non-fatal so, in an Unattended Mode, the Boot ROM will
still boot the first OS it finds. Pressing
I
Return
I
will terminate the beeping error code and abort
the one minute wait. Pressing
[]eturn
I
will also make the SPU revert to the Attended Mode.
This means that the Boot ROM will display all OSes found and will not boot one until one is
chosen and entered by the user.
SCSI Interface Fusing
An electronic fuse in the SCSI interface's +5 V dc power input will blow when excessive current
is drawn. When trying to boot an OS through the SCSI interface and the SCSI electronic fuse
blows, the fuse may be reset by re-starting the self-tests and boot sequence. Note that if the
condition that caused the fuse to blow has not been corrected, the fuse will blow again as soon
as the SPU is turned on.
If this fuse blows while HP-UX is executing, constant RST interrupts will occur. The SCSI
driver to turn off the SCSI interface. If the SCSI disc drive is a root disc in the HP-UX system,
that root disc drive will need to have its power cycled. However, if the root disc drive is used
with HP-IB, the HP-UX system will continue running but no SCSI discs will function until the
HP-UX system is taken down and power is cycled.
General Description of LED Failure Codes
Failure Indications
If a failure occurred during the self-tests, then that failure will be indicated on the LEDs at the
end of the tests. If there was more than one failure, the highest priority failure will be indicated
on the LEDs. All the LED values are listed below.
The highest priority failure is also sounded off on the beeper, if present. The lower 7 bits of the
LED value are sounded off, most significant bit first, one second per bit, with a zero represented
by a low tone and a one represented by a high tone. If no failure occurs, the beeper will not
sound off.
This means that the Boot ROM will display all systems found and will not boot a system until
one in chosen and entered by the user.
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Troubleshooting