Identify a failing part on a model 7047-185 or 7037-A50

You might need to use the light path diagnostics to help locate or identify a failing part. Use the procedure in this section to accomplish this task.

Light path diagnostics provide a path that you can follow to help you identify the source of an error. The server must be connected to a power source for the light-emitting diodes (LED) inside the server to be lit; the server does not have to be turned on for the LEDs to be lit.

The server is designed so that LEDs remain lit when the server is connected to an ac 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.

Many errors are first indicated by a lit information LED or system-error LED on the operator information panel on the front of the server. If one or both of these LEDs are lit, one or more LEDs elsewhere in the server might also be lit and can direct you to the source of the error.

To identify a failing part follow these steps:

If this is a rack mounted server, Place the rack-mounted model 7047-185 or 7037-A50 in the service position or operating position.
Remove and replace the model 7047-185 or 7037-A50 side cover.

Find the light-path diagnostic card on top of the fan attached to the disk drive cage. Use the following figure and table to identify each light on the card.

Figure 1. Light path diagnostic card indicator LED layout

Table 1. Fault-indicator LEDs
1	Power supply fault-indicator LED	7	Front fan fault-indicator LED
2	Voltage-regulator module fault-indicator LED	8	Battery fault-indicator LED
3	Disk-drive bay fan fault-indicator LED	9	PCI adapter fault-indicator LED
4	Optical-media bay fault-indicator LEDs	10	Thermal fault-indicator LED
5	Disk-drive bay fault-indicator LEDs	11	Rear fan fault-indicator LED
6	System backplane fault-indicator LED	12	Memory fault-indicator LED

Refer to the service label on your system or the following figure to locate an LED on the system backplane for replaceable parts.
Figure 2. System backplane indicator LED layout