Technical Reference Guide 4–3
Troubleshooting
LEDs
Several LEDs are on the front and rear panels of the workstation (see figures on page 1-7 and
page 1-9). See the following sections for a detailed description of these functions.
LAN LEDs (Front and Rear Panel)
The LAN Activity LED on the front panel of the system blinks green when LAN activity is
present.
The two LAN LEDs on the LAN connector on the rear panel provide additional information
about LAN connection and activity.
Disk Activity LED
The Disk Activity LED on the front panel indicates the state of disk and drive activity on the
system.
NOTE: The Disk Activity LED automatically communicates with IDE and SCSI drives
connected to the built-in controllers.
To get this functionality with an SCSI or IDE controller card, connect the card with an LED
activity cable to the hard drive activity LED connector on the system board.
Refer to “System Board Components and Connectors” on page 3-4 for a picture showing where
on the system board to connect the LED activity cable (item 36).
LAN LED Location Color State
1. Activity Tower: Right Off No LAN connection
Rack-mounted: Top Yellow Link established
Blinking Activity on LAN port
2. Speed Tower: Left Off 10Mbps
Rack-mounted: Bottom Orange 100Mbps
Green Link at 1000Mbps
Disk Activity LED State
Off Off or no current disk/drive activity
Blinking (green) Disk/drive is being accessed
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