IBM X3950 X5 Problem Determination And Service Manual page 31

Platform Module (TPM). Press this button to turn on or turn off this LED locally.
You can use IBM Systems Director to light this LED remotely.
In a two-node configuration, this LED is lit on the primary server and flashes on
the secondary server during POST.
You can press this button or use an IPMI command to turn this LED on or off.
v Ethernet port activity LEDs: When either of these LEDs is lit, it indicates that
the server is transmitting to or receiving signals from the Ethernet LAN that is
connected to the Ethernet port that corresponds to that LED.
Light path diagnostics panel
This topic provides illustrations that show the operator information panel, as well
as the controls and LEDs on the light path diagnostics panel.
The light path diagnostics panel is on the top of the operator information panel.
To access the light path diagnostics panel, slide the blue release button on the
operator information panel to the left. Pull forward on the operator information
panel until the hinge of the panel is free of the server chassis. Then pull down on
the operator information panel, so that you can view the light path diagnostics
panel information.
Operator information
panel
Light path
diagnostics LEDs
Release latch
Note:
1. For optimum fan speed, do not run the server for more than 10 minutes while
the light path diagnostics panel is pulled out of the server.
2. Light path diagnostics LEDs remain lit only while the server is connected to
power.
The following illustration shows the controls and LEDs on the light path
diagnostics panel.
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Chapter 2. Introduction