IBM 883725U, Руководство по установке

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Light Path
activity LED (CR 60)
Light Path diagnostic
button (SW 2)
After ac power has been removed from the server, power remains available to the
LEDs for up to 12 hours. After 12 hours, you must turn on the server to supply
power to the LEDs. Complete the following steps to view the LEDs with the server
cover removed:
1. Turn off the server and all peripheral devices; then, disconnect all external
cables from the server.
2. Slide the server out of the rack cabinet.
3. Remove the server cover.
4. Press and hold the blue Light Path diagnostic button on the system board. The
system board LEDs that indicate the component failure will be lit while you
press the Light Path diagnostic button. You can light the LEDs for a maximum of
2 minutes, after which power is no longer available for the LEDs. Look for any
LEDs that are lit on the system board to find the failing component.
Note: Sometimes no Light Path diagnostic LEDs are lit on the system board
when a failure occurs. To make sure that these LEDs are supposed to be
off and that the Light Path diagnostic circuits are working correctly there
is a Light Path activity LED (see previous illustration). When you press
the Light Path diagnostic button and the Light Path activity LED lights,
this indicates that the Light Path diagnostic circuitry is working properly
and that no LEDs should be lit with this particular error.
5. Install the server cover; then, slide the server into the rack cabinet and connect
all external cables. See the Rack Installation Instructions for information about
how to install the server into rack cabinet.
The following illustration shows the LEDs on the Light Path diagnostics panel. See
“Light Path diagnostics LEDs” on page 66 for information about the LED meanings.
Chapter 6. Solving problems
65