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Preventive Maintenance and Fault-Finding
Note: Failure to ensure a free air-flow around the unit may cause overheating.
Table 4.2 Fans Not Working/Overheating Fault-Finding
Step
Action
1
Check Fan Rotation. Inspect
the fans located at the sides of
the enclosure. Are the fans
rotating? Check the
temperature (select
Environment on the Device
Info web page).
4.4.8
Input Card Failure
To aid in diagnosing an Input Card problem, fault-find as detailed in Table 4.3.
Table 4.3
Input Card Failure Fault-Finding
Step
Action
1
Check the status of the
Input Card. Is there a
modulator failure alarm being
shown on the Status web
page?
Check the status of the
2
input ports. Do the ports
reflect the reported status?
4-8
This condition is detected by a temperature sensor; it may be used to trigger
an automatic alarm.
If Result of Action is Yes...
Check that the unit has been
installed with sufficient space
allowed for air-flow (see
Chapter 2, Installing the
Equipment). If the ambient air is
too hot, additional cooling may
be required.
If Result of Action is Yes...
If the unit indicates a critical
failure, call a Service Engineer.
Discuss the perceived problem
with Ericsson Customer
Support.
If Result of Action is No...
Possible break in the DC supply
from the PSU module to the
suspect fan(s). Call a Service
Engineer.
If Result of Action is No...
If no modulator failure alarm is
shown, go to Step 2.
If the port is not providing a valid
input when it has been enabled,
call a Service Engineer.
EN/LZT 790 0005 R7A
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