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Table 9–5 (Cont.) Interpreting Power Supply Lights
Light
Meaning
Front End Unit (FEU)
FEU OK
When on, indicates DC output voltages
for the FEU are above the specified
minimum.
FEU Failure
When on, indicates DC output voltages
for the FEU are less than the specified
minimum.
Power System Controller (PSC)
PSC OK
When blinking, indicates the PSC is
performing power-up self-tests.
When steady, indicates the PSC is
functioning normally.
PSC Failure
When on, indicates the PSC has detected
a fault in itself.
Disk Power
When on, indicates a local disk converter
Failure
has failed. The letter of the failing unit
is displayed in the hexadecimal fault ID
display.
Fan Failure
When on, indicates a fan has failed. The
failing fan is identified by a number
displayed in the hexadecimal fault ID
display.
Overtemperature
When on, indicates the PSC has shut
Shutdown
down the system due to excessive internal
temperature.
Power Problems
Action on Error
Call Digital Services.
Call Digital Services.
Call Digital Services.
Call Digital Services.
Set the DC on/off switch to off
(0). Examine the air plenum at
the top of the system and the air
exhaust ports at the bottom sides
of the system, making sure they
are not blocked. Power up the
system when you have removed
ventilation blocks. Wait at least
one minute before turning on the
system.
(continued on next page)
Troubleshooting the System
9–7
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