Light Path Diagnostics Panel - IBM 7944 Installation And User Manual

• Hard drive activity LED: When this green LED is lit, it indicates that one of the hard disk drives is in use.
Notes:
1. For a SAS drive, a hard disk drive activity LED is shown in two places: on the hard disk drive and on
the operator information panel.
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
Figure 7. Light path diagnostics panel exposure
The following illustration shows the LEDs and controls on the light path diagnostics panel.
System x3550 M3Installation and User's Guide
16
Release latch