2. For a SATA drive, hard disk drive activity is indicated only by the hard disk drive activity LED on the
operator information panel.
Light path diagnostics panel
The light path diagnostics panel is located on the top of the operator information panel.
Note: The system service label on the underside of the cover also provides information about the location of
the light path diagnostics LEDs.
To access 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.
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 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.
Operator information
panel
Light path
diagnostics LEDs
Release latch
Figure 4. Light path diagnostics panel exposure
The following illustration shows the LEDs and controls on the light path diagnostics panel.
Figure 5. Light path diagnostics panel exposure
• Remind button: This button places the system-error LED on the front panel into Remind mode. In Remind
mode, the system-error LED flashes every 2 seconds until the problem is corrected, the system is
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System x3550 M3Problem Determination and Service Guide
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