Lenovo 6447, 6446 Diagnosing problems using light path diagnostics, Light path diagnostics LEDs

Press the reset button to reset the server and run the power-on self-test (POST). You might have to use a pen or the end of a straightened paper clip to press the button.

The server is designed so that LEDs remain lit when the server is connected to a power source but is not turned on, provided that the power supply is operating correctly. This feature helps you to isolate the problem when the operating system is shut down.

Diagnosing problems using light path diagnostics

LEDs in two locations on the server are available to help you diagnose problems that might occur during installation. Use them in the following order:

1.Light path diagnostics panel - Look at this panel first. If a system error has occurred, the system-error LED on the front of the light path diagnostics drawer is lit. Slide the latch to the left on the front of the operator information panel to access the light path diagnostics panel. Note any LEDs that are lit, and then close the drawer.

2.LEDs on the system board - To identify the component that is causing the error, note the lit LED on or beside the component.

Light path diagnostics LEDs

The following table describes the LEDs on the light path diagnostics panel, the problems that they indicate, and actions to solve the problems.

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

LED	Description	Action
None, but	An error has occurred and cannot be	Use the Configuration/Setup Utility program to check the
the	diagnosed, or the Advanced System	system-error log for information about the error.
system-	Management (ASM) processor on the
error LED	Remote Supervisor Adapter II SlimLine
is lit.	has failed. The error is not represented
	by a light path diagnostics LED.
OVER	The power supplies are using more	1. Remove optional devices from the server.
SPEC	power than their maximum rating.
		2. Replace the failing power supply.
		Attention: In a dc power environment, only trained
		service personnel other than Lenovo service technicians are
		authorized to connect or disconnect power to the dc power
		supply and to remove and install a dc power supply. See
		the documentation that comes with each dc power supply.
PS 1	The power supply in bay 1 has failed.	Attention: In a dc power environment, only trained service
		personnel other than Lenovo service technicians are authorized
		to connect or disconnect power to the dc power supply and to
		remove and install a dc power supply. See the documentation
		that comes with each dc power supply.
		1. Make sure that the power supply is correctly seated.
		2. Replace the failed power supply.

78ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide