Replacing The Fan Unit; Figure 5-12 Position Of The Fan Unit - Huawei BBU3900 Hardware Maintenance Manual

BBU3900
Hardware Maintenance Guide
Postrequisite
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5.6 Replacing the FAN Unit

The FAN unit is located in the BBU. The unit and the air inlet box form a ventilation loop, which
ensures ventilation and heat dissipation. Replacing the FAN unit may lead to overtemperature
alarms due to interruption of heat dissipation in the BBU. The services, however, are not affected.
Prerequisite
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Context
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Procedure
Step 1 Wear an ESD wrist strap or a pair of ESD gloves.
Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD
gloves, to prevent electrostatic damage to the boards, modules, or electronic components.
Step 2 Remove the two M3 screws on the panel, and then remove the FAN unit, as shown in
5-13.
Issue 03 (2010-06-05)
Place the replaced component into the ESD box or bag. Then, place the ESD box or bag
into a carton padded with foam or into the packing box of the new component.
Fill in the fault form with the details of the replaced component.
Contact the local Huawei office to handle the faulty component.
The tools and materials, such as an ESD wrist strap or ESD gloves and M3 screwdriver,
are ready.
The quantity and type of board to be replaced are confirmed. For details, see
Board Information.
The authorized personnel are permitted to enter the site. The required keys are available.
Figure 5-12 shows the position of the FAN unit in the BBU.

Figure 5-12 Position of the FAN unit

FAN
The unit is hot-swappable.
Replacing the FAN unit may lead to overtemperature alarms due to interruption of heat
dissipation in the BBU. Therefore, the FAN unit should be replaced within three minutes.
WARNING
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Copyright © Huawei Technologies Co., Ltd.
5 Replacing Components of the BBU3900
5.1 Querying
Figure
5-11