CAUTION
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 Set the MCB labeled SW7 on the DCDU-03B to OFF to power off the HEUA.
Step 3 Record all the cable connections on the panel of the board to be replaced.
Step 4 Disconnect the power cable and monitoring cable from the HUEA, as shown in Figure 4-2.
Figure 4-2 Disconnecting cables
Step 5 Unscrew the cover plate, and then unscrew the HEUA, as shown in Figure 4-3.
Figure 4-3 Removing the HEUA
Step 6 Install the new board, tighten the screws on the board until the tightening torque reaches 0.55
N·m, and then reconnect the cables.
Step 7 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 component.
l Contact the local Huawei office to handle the faulty component.
BBU3900
Hardware Maintenance Guide 4 Replacing the Components in the OMB
Issue 03 (2010-06-05) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4-3
To Next Page
Loading...
