Sun Microsystems Rack Service Manual page 21

TABLE 2-2
Condition LED
Normal operation Okay to Remove
Fault
Ready
~ AC 1-9 ODD
~ AC 0-8 EVEN
Sequencer fault Okay to Remove
Fault
Ready
~ AC 1-9 ODD
~ AC 0-8 EVEN
Turned off Okay to Remove
Fault
Ready
~ AC 1-9 ODD
~ AC 0-8 EVEN
Missing AC input Okay to Remove
Fault
Ready
~ AC 1-9 ODD
~ AC 0-8 EVEN
LED Indicators on the Power Sequencer
LED Status
OFF
OFF
ON
ON
ON
OFF
ON
(ON or OFF)
ON
ON
ON
(ON or OFF)
(ON or OFF)
OFF
OFF
OFF
OFF
ON
OFF
ON
Troubleshooting Action
No action required.
1. Turn off both power switches. The blue
"Okay to Remove" LED lights.
2. Remove and replace the power sequencer.
You can safely remove the sequencer.
Assuming both power switches are on, start
troubleshooting the input to the sequencer:
1. Input power panel connectors
2. Branch (wall) circuit breaker
Chapter 2 Troubleshooting 15