18 Chapter 1
Introduction
System displays
SCUB 3.3-Volt error
This error indicates that the SCUB 3.3-Volt power supply has failed, but
the 5-Volt supply has not.
ASIC installation error
Each ASIC in the node has ASIC Install lines to prevent power-up if an
ASIC is installed incorrectly (such as a SPAC installed in an ERAC
position). If an ASIC is improperly installed, the Utilities board does not
power up the system. This condition is not monitored after power up.
DC OK error
When this error is displayed, the power-on circuit did not power up the
system, because one or more 48-Volt power supplies reported an error. In
systems with redundant 48-Volt power supplies, this error means that
two or more 48-Volt supplies reported an error.
48-Volt error
If the 48-Volt supply has dropped below 42 volts for any reason other
than normally turning off the system or an ac failure, then this error is
displayed by the power-on circuit. Also, the 48-Volt supply that reported
the error and the power-up state of the system at the time of the error is
displayed.
48-Volt yo-yo error
This error indicates that a 48-Volt error occurred and the SCUB lost and
then later regained power without the machine being turned off. The
power-on circuit will display this error and not power on the system,
because the 48-Volt supply is likely at fault.
Clock failure
If the system clock fails, the SMUC is unable to monitor environmental
errors that could possibly damage the system. If the power-on circuit
receives no response from the SMUC, it powers down the system and
displays this error.
