1. Load and activate the software version of the UPEU. For details, see the related LMT User
Guide.
2. Run the UBL CELL command to unblock all the cells in the base station.
3. Check and ensure that no alarm related to the board is generated. For details, see the related
LMT User Guide.
4. Manually synchronize the inventory information. For details, see the M2000 Operator
Guide.
Step 11 Take off the ESD wrist strap or gloves, and then pack up all the tools.
----End
Postrequisite
l 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.
l Fill in the fault form with the details of the replaced board.
l Contact the local Huawei office to handle the faulty board.
5.5 Replacing the UEIU
The Universal Environment Interface Unit (UEIU) provides channels for transmitting the
monitoring signals from the service board to the BBU.
Prerequisite
l The tools and materials, such as an ESD wrist strap or ESD gloves and M3 screwdriver,
are ready.
l The quantity and type of board to be replaced are confirmed. For details, see 5.1 Querying
Board Information.
l The authorized personnel are permitted to enter the site. The required keys are available.
Context
l Figure 5-9 shows the position of the UEIU in the BBU.
Figure 5-9 Position of the UEIU
UEIU
l The board is hot-swappable.
l Replacing the UEIU disrupts the monitoring of the external equipment. Therefore, the
UEIU should be replaced within five minutes.
BBU3900
Hardware Maintenance Guide 5 Replacing Components of the BBU3900
Issue 03 (2010-06-05) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-9
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