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170 Appendix A
LED codes
Power on detected errors
30-39 48V error
(maintenance)
no supply
failure
reported
PWRUP=0-9
1. Error occurs when 48 volt
distribution falls below 42
volts during powerup state
displayed. Powerup state
indicates which loads are
being turned on.
2. Excessive load on 48 volts due
to an inadequate number of
functioning 48 volt supplies
or overload condition on 48V
bus.
3. Possible node power supply
(NPS) failure.
Call the Response Center.
3A 48V Yo Yo
error
1. Core utilities board (CUB)
lost and then regained 48V
power without the machine
being turned off or ac power
failure.
2. Core utilities board (CUB)
will display this error and not
power on the system.
• Cycle dc power to the
node using the keyswitch
to attempt to clear the
Yo Yo bit.
• Call the Response
Center.
3B MIB power fail
(MIBPB)
1. VDD (3.3V) error on
MidPlane power board
(MIBPB).
2. Midplane power fails and
entire node will power down.
3. Core utilities board (CUB)
still active.
• Cycle dc power to the
node using the keyswitch
to attempt to clear the
error.
• Call the Response
Center.
3C Clock fail • Core utilities board (CUB)
monitors clock on MidPlane
(MIB).
Call the Response Center.
LED Fault Symptoms Corrective action