Figure 5-10 Disconnecting Cables; Figure 5-11 Removing The Ueiu - Huawei BBU3900 Hardware Maintenance Manual

5 Replacing Components of the BBU3900
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 Record all the cable connections on the panel of the board to be replaced.
Step 3 Disconnect the monitoring cable and alarm cable from the UEIU, as shown in

Figure 5-10 Disconnecting cables

Step 4 Remove the two M3 screws on the panel, and then remove the UEIU, as shown in
5-11.

Figure 5-11 Removing the UEIU

Step 5 Install the new board, tighten the screws on the board until the tightening torque reaches 0.6
N·m, and then reconnect the cables.
Step 6 Inform the M2000 administrator that the replacement is complete, and then instruct the
administrator to perform the following operations:
1.
2.
Step 7 Take off the ESD wrist strap or gloves, and then pack up all the tools.
----End
5-10
WARNING
Check and ensure that no alarm related to the board is generated. For details, see the related
LMT User Guide.
Manually synchronize the inventory information. For details, see the M2000 Operator
Guide.
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Copyright © Huawei Technologies Co., Ltd.
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BBU3900
Hardware Maintenance Guide
Figure 5-10.
Figure
Issue 03 (2010-06-05)