Ericsson EDN312 Guide de l'utilisateur télécharger pdf (Page 43)

Maintenance

4/1553-HSC 901 101/2 Uen B 2009-02-27

7 Maintenance

The only parts that should be replaced from time to time in the EDN312,

ESN108 and EXN104 are the fans. There is no maintenance work for the

EPN102.

Each node has two fans. The speed of the fans is regulated according to

the temperature. An alarm is issued if a fan stops.

The node will check both fans every 24 hour to validate the quality of the

fan, based on revolutions per minute (rpm) at full speed. An alarm is issued

if a fan fails to reach a specific threshold value.

7.1 Replacing a Fan

Required Tools: Plastic tweezers

Stop!

Use only plastic tweezers to avoid short circuiting the power.

7.1.1 Removing the Fan

The replacement of a fan is done from the front, (see Figure 17 - example

from EXN104). Use the wires (with the tweezers) to pull out the plug. Use

the wires to pull the fan out. In the EDN312 use the tweezers to level the

fan on the opposite side of the wires while pulling it out.

7.1.2 Mounting the new Fan

Stop!

Do not press the rotor directly as this may damage the fan

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Ericsson EDN312 Guide de l'utilisateur Page 43