IBM 7378, Руководство по диагностике и обслуживанию

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Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal
components of the server. When an error occurs, LEDs are lit throughout the
server. By viewing the LEDs in a particular order, you can often identify the source
of the error.
When LEDs are lit to indicate an error, they remain lit when the server is turned off,
provided that the server is still connected to power and the power supply is
operating correctly.
Before you work inside the server to view light path diagnostics LEDs, read the
safety information that begins on page vii and “Handling static-sensitive devices” on
page 151.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Look at the operator information panel LEDs on the front of the server.
v
If an operator information panel LED is lit, it indicates that information about a
suboptimal condition in the server is available in the system-event log.
The following table lists the operator information panel LEDs, the problems that
they indicate, and actions to solve the problems.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See the Chapter 4, “Parts listing, System x3400 M3 Types 7378 and 7379,” on page 141 to determine which
components are customer replaceable units (CRU) and which components are field replaceable units
(FRU).
v
If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Lit light path diagnostics LED with the
system-error or information LED also lit
Description
System power (green)
v Off: AC power is not present, or the power supply or the LED itself
has failed.
v
Flashing rapidly (4 times per second): The server is turned off
and is not ready to be turned on. The power-control button is
disabled. This will last approximately 20 to 40 seconds.
Note: Approximately 20 seconds after the server is connected to ac
power, the power-control button becomes active.
v Flashing slowly (once per second): The server is turned off and is
ready to be turned on. You can press the power-control button to
turn on the server.
v Lit: The server is turned on.
v Fading on and off: The server is in a reduced-power state. To
wake the server, press the power-control button or use the IMM
Web interface.
Hard disk drive activity (green) When this LED is flashing rapidly, it indicates that there is activity on a
hard disk drive.
System locator (blue) Use this LED to visually locate the server among other servers. You
can use IBM Systems Director to light this LED remotely.
System information (amber) When this amber LED is lit, it indicates that information about a
suboptimal condition in the server is available in the IMM event log or
in the system-event log.
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IBM System x3400 M3 Types 7378 and 7379: Problem Determination and Service Guide