Preventive Maintenance and Fault-Finding
Note: Failure to ensure a free air-flow around the unit may cause overheating.
This condition is detected by a temperature sensor; it may be used to trigger
an automatic alarm.
Table 4.2 Fans Not Working/Overheating Fault-Finding
Step Action If Result of Action is Yes… If Result of Action is No…
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).
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.
Possible break in the DC supply
from the PSU module to the
suspect fan(s). Call a Service
Engineer.
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 If Result of Action is Yes… If Result of Action is No…
1
Check the status of the
Input Card. Is there a
modulator failure alarm being
shown on the Status web
page?
If the unit indicates a critical
failure, call a Service Engineer.
If no modulator failure alarm is
shown, go to Step 2.
2
Check the status of the
input ports. Do the ports
reflect the reported status?
Discuss the perceived problem
with Ericsson Customer
Support.
If the port is not providing a valid
input when it has been enabled,
call a Service Engineer.
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