Preventive Maintenance and Fault-finding
Step Action If Result of Action is Yes… If Result of Action is No…
3
Check Power Cable and Fuse.
Unplug the power connector
from the unit and try it in another
piece of equipment. Does it
work?
The problem lies within the
unit. Proceed to next step.
The problem lies with either the
cable itself, or with the fuse in
the plug. Replace the fuse or try
to substitute another cable.
4
Check PSU Module(s) and
Fuse(s). Ensure the power
connector is unplugged.
Remove the fuse from the rear
panel connector and inspect it.
Has the fuse blown?
Replace the fuse with one of
the correct type and rating
(see Annex B Technical
Specification). If the PSU still
does not work, unplug the
power cable and call a Service
Engineer.
Possible problem with the PSU
module. Call a Service Engineer.
8.5.3.1 Fuse Replacement
Please refer to the Installation, Safety and Compliance Information for Ericsson
Compression Products Reference Guide supplied with your product for full details of
how to replace the fuse in your product.
8.5.3.2 Lithium Battery
The lithium battery fitted within this product is not user replaceable and as such
should only be replaced by qualified service personnel.
8.5.4 Fan(s) Not Working/Overheating
The fan speed can be reduced (set to lowest noise) at low temperatures to allow the
unit to quickly attain operational temperature. In the event of overheating problems,
refer to Table 8.4.
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 8.4 Fans Not Working/Overheating
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 Base Board
temperature and fan (see
nCompass information).
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.
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