IBM xSeries 235, Maintenance & Troubleshooting

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Power-supply LEDs
The ac and dc power LEDs on the power supply provide status information about
the power supply. The following illustration shows the location of the ac and dc
power LEDs.
Note: The following illustration shows the rear of the server with two hot-swap
power supplies installed. A server with a single fixed power supply is similar.
1 2
AC power LED
(green)
AC power LED
(green)
DC power LED
(green)
DC power LED
(green)
Ethernet link
status LED
PCI-X slot 5
attention LED
PCI-X slot 6
attention LED
Power supply 2
Power supply 1
Fan 1 LED
Fan 2 LED
NMI button
(service use only)
For more information about the ac and dc power LEDs, see “Power-supply LED
errors” on page 141.
Light Path Diagnostics
If the system error LED in the operator information panel on the front of the server
is on, one or more LEDs inside the server might be on. Use the Light Path
Diagnostics panel to quickly identify the type of error that occurred.
For LED locations, see “System-board LED locations” on page 49.
Your server is designed so that LEDs remain lit when the server shuts down,
provided that the power supplies are operating properly. This feature helps you to
isolate the problem even if an error causes the server to shut down.
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xSeries 235 Type 8671: Hardware Maintenance Manual and Troubleshooting Guide