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Appendix C — Troubleshooting
C-2 Ethernet Power Supply User s Guide
Troubleshooting Table
Problem Resolution
The Ethernet
Power Supply is
plugged into a
main AC outlet,
but does not
power up.
Verify the use of a correct and functional
AC power cord, including good and solid
ground connection.
Verify the AC outlet is supplying power
(test with a different device) and the
voltage is between 100VAC and 240VAC
(50Hz to 60Hz).
Reconnect the Ethernet Power Supply to
the AC outlet and verify the LEDs power
up sequence. See the LEDs section
earlier in this guide.
The Ethernet
Power Supply is
plugged in and
running, but the
fans are not
working.
Verify all fan openings in the case are
clear of any air-blocking materials.
If fans are not working, there may be an
internal power supply fault.
The Ethernet
Power Supply
operates, but
the AC LED is
off.
If both internal fans are working (that is,
air flows out of the case or can be heard),
there is a possible internal circuitry fault.
If fans are not working, there may be an
internal power supply fault.
The Ethernet
Power Supply
has powered up
and the AC LED
is orange.
See whether the power-on self-test
(POST) sequence is as listed or not.
If the LEDs light in the correct sequence,
the Ethernet Power Supply is fully
operational.
If the problem remains following the
POST sequence, the Ethernet Power
Supply POST detected an internal fault.
Contact 3Com.