
Power Problems
Figure 9–1 Power Supply Lights
MO
SI
SO
FEU Failure
FEU OK
AC Circuit
Breaker
AC Present
PSC Failure
PSC OK
Fan Failure
Fault ID Display
DC5 Failure
DC5 OK
DC3 Failure
DC3 OK
PSC
DC3
FEU
DC5
Over
Overtemperature
Shutdown
Disk Power Failure
LJ-02011-TI0
Table 9–5 Interpreting Power Supply Lights
Light
Meaning
Action on Error
Front End Unit (FEU)
AC Present
When on, indicates AC power is present
at the AC input connector (regardless of
circuit breaker position).
If AC power is not present, check
the power source and power cord.
If the system will not power up
and the AC light is the only light
that is on, check the AC circuit
breaker.
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9–6 Troubleshooting the System
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