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Fault analysis 57
Model 3120 RAS Getting Started Guide 5 • Troubleshooting and maintenance
Fault analysis
The following procedures outline steps you should follow when troubleshooting a RAS malfunction.
1. If possible, talk to the person who filed the trouble complaint and determine the operational symptoms.
Record the symptoms on the appropriate trouble report form (include the front panel LED indications).
2. Refer to table 5 for LED definitions and compare the recorded results from the trouble report against those
in the table, then refer to the section recommended in the table for the maintenance procedure that will
repair the malfunction.
Table 5. LED definitions
LED Location Color Status Meaning
POWER Front panel Green On solid Power is being applied. No action recommended.
Flashing A power supply has failed. One of the power supplies has
malfunctioned. The RAS will function normally indefinitely
with one power supply, so you can wait until a low traffic
time, then refer to “Replacing the RAS” on page 61 to
replace the RAS.
Off No input power is being applied. Verify that power is
being supplied to the RAS.
CPU FAIL Front panel Red On solid The CPU has failed. As soon as possible, unplug both
power cables from the RAS, wait 30 seconds, then plug
the cables back into the RAS to see if the problem disap-
pears. If the CPU FAIL LED is still lit after the RAS completes
the power-up cycle, refer to “Replacing the RAS” on
page 61 to replace the RAS.
Off The CPU is operating normally. No action recommended.
ALARM Front panel Red On solid A minor alarm condition has been detected.
Flashing A major alarm condition has been detected.
Off The RAS is operating normally. No action recommended.
SYSTEM Front panel Green
Flashing The RAS is operating normally. No action recommended.
Off The RAS has malfunctioned. The RAS is not functioning
properly. As soon as possible, unplug both power cables
from the RAS, wait 30 seconds, then plug the cables back
into the RAS to see if the problem disappears. If the SYS-
TEM LED is still not lit after the RAS completes the power-
up cycle, refer to “Replacing the RAS” on page 61 to
replace the RAS.