Figure 5-2 Removing The Bbu - Huawei BBU3900 Hardware Maintenance Manual

5 Replacing Components of the BBU3900
Step 2 Power off the BBU. For details, see
Step 3 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 4 Record all the cable connections on the panels of the boards in the BBU to be replaced.
Step 5 Disconnect the power cables, transmission cables, CPRI cables, and alarm cables from the panels
of the boards in the BBU.
Step 6 Loosen the four M6 screws on the BBU, and then remove the BBU, as shown in

Figure 5-2 Removing the BBU

Step 7 Remove all the boards in the faulty BBU, install the boards in the corresponding slots of the new
BBU, and then install filler panels in the idle slots.
Step 8 Install the new BBU, tighten the screws on the BBU until the tightening torque reaches 2 N·m,
and then reconnect the cables.
Step 9 Power on the BBU. For details, see
Step 10 Check whether the new BBU is functional according to the status of the LEDs on the BBU. For
details about the status of the LEDs, see the related hardware description.
Step 11 Inform the M2000 administrator that the replacement is complete, and then instruct the
administrator to perform the following operations:
1.
2.
3.
Step 12 Take off the ESD wrist strap or gloves, and then pack up all the tools.
----End
5-4
WARNING
Run the DLD CFGFILE command to download the backed up data configuration file of
the NodeB to the new BBU.
Check and ensure that no alarm related to the boards or modules in the BBU is generated.
Manually synchronize the inventory information. For details, see the M2000 Operator
Guide.
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Copyright © Huawei Technologies Co., Ltd.
3.2 Powering Off the
3.1 Powering On the BBU.
Hardware Maintenance Guide
BBU.
Figure
Issue 03 (2010-06-05)
BBU3900
5-2.