2. To view the light path diagnostics panel, slide the blue release latch on the
operator panel to the left. Pull forward on the panel until the hinge of the
operator panel is free of the server chassis. Then pull down on the panel so that
you can view the light path diagnostics panel information. This reveals the light
path diagnostics panel. Lit LEDs on this panel indicate the type of error that has
occurred.
Note: When you slide the light path diagnostics panel out of the server to
check the LEDs or checkpoint codes, do not run the server continuously with
the light path diagnostics panel outside of the server. The panel should only be
outside of the server a short time. The light path diagnostics panel must remain
in the server when the server is running to ensure proper cooling.
The following illustration shows the light path diagnostics panel:
Note any LEDs that are lit, and then reinstall the light path diagnostics panel in
the server.
Note: When you slide the light path diagnostics panel out of the server to
check the LEDs or checkpoint codes, do not run the server continuously with
the light path diagnostics panel outside of the server. The panel should only be
outside of the server a short time. The light path diagnostics panel must remain
in the server when the server is running to ensure proper cooling.
Look at the system service label inside the server cover, which gives an
overview of internal components that correspond to the LEDs on the light path
diagnostics panel. This information and the information in “Light path diagnostics
LEDs” on page 104 can often provide enough information to diagnose the error.
3. Remove the server cover and look inside the server for lit LEDs. Certain
components inside the server have LEDs that are lit to indicate the location of a
problem.
The following illustration shows the LEDs and connectors on the system board.
102 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
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