IBM System x3550 M3 Type 4254 Problem Determination And Service Guide

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
Release latch
The following illustration shows the LEDs and controls on the light path diagnostics
panel.
Chapter 2. Introduction 11

IBM System x3550 M3 Type 4254 Specifications

General

Brand	IBM
Model	System x3550 M3 Type 4254
Category	Server
Language	English