Lenovo System x3750 M4 Installation And Service Manual page 178

Light path
diagnostic
LEDs
Operator information
panel
2. To view the light path diagnostics panel, press in on the blue release button on the operator information
panel and pull forward on the panel until the hinge of the operator information 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. The following illustration shows the light path diagnostics panel.
Light Path Diagnostics
Note any LEDs that are lit, and then slide the light path diagnostics panel back into the server.
• Boot code display: This display provides an error code that indicates the point at which the system
stopped during the boot block and POST. A boot code is either a byte or a word value that is
produced by UEFI. This display will provide error codes in the event of a microprocessor error or
a power fault. In addition to the IMM log, the codes can provide suggested components to be
replaced. For more information about the error codes displayed in the boot code display area on
the light path diagnostics panel and the actions to take, see Appendix A "Boot code display error
codes" on page 315.
• Remind button: Press this button to place the system-error LED on the front information panel into
Remind mode. By placing the system-error LED indicator in Remind mode, you acknowledge that
you are aware of the last failure but will not take immediate action to correct the problem. In Remind
mode, the system-error LED flashes every 2 seconds until one of the following conditions occurs:
– All known errors are corrected.
– The server is restarted.
– A new error occurs, causing the system-error LED to be lit again.
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Lenovo System x3750 M4 Installation and Service Guide
Release
button