Figure 5-4 Disconnecting Cables; Figure 5-5 Removing The Wmpt - Huawei BBU3900 Hardware Maintenance Manual

5 Replacing Components of the BBU3900
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 3 Record all the cable connections on the panel of the board to be replaced.
Step 4 Disconnect the transmission cables and CPRI cables from the WMPT. If a surge protection board
is configured, the surge protection transfer cable also needs to be disconnected, as shown in
Figure

Figure 5-4 Disconnecting cables

Step 5 Loosen the two M3 screws on the panel, and then remove the WMPT, as shown in
5-5.

Figure 5-5 Removing the WMPT

Step 6 Set the DIP switch on the new board according to the settings of the DIP switch on the faulty
board. For details, see WMPT.
Step 7 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 8 Check whether the new board is functional according to the status of the LEDs on the board.
For details about the status of the LEDs, see WMPT.
Step 9 Inform the M2000 administrator that the replacement is complete, and then instruct the
administrator to perform the following operations:
1.
2.
3.
5-6
WARNING
5-4.
1
Load and activate the software version of the WMPT. For details, see the LMT User
Guide.
Run the DLD CFGFILE command on the LMT to download the backed up data
configuration file of the NodeB to the new BBU.
Check that no alarm related to the board is generated . For details, see the LMT User
Guide.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2
BBU3900
Hardware Maintenance Guide
Figure
Issue 03 (2010-06-05)