DEC 4000 600 series, Owner'S Manual, Page: 203 / 242

Power Problems
Table 9–5 (Cont.) Interpreting Power Supply Lights
Light Meaning Action on Error
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. Call Digital Services.
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. Call Digital Services.
Disk Power
Failure When on, indicates a local disk converter
has failed. The letter of the failing unit
is displayed in the hexadecimal fault ID
display. Call Digital Services.
Fan Failure When on, indicates a fan has failed. The
failing fan is identified by a number
displayed in the hexadecimal fault ID
display.
Call Digital Services.
Overtemperature
Shutdown When on, indicates the PSC has shut
down the system due to excessive internal
temperature. 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