Figure 5-13 Removing the FAN unit
1
2
CAUTION
Do not touch the rotating fans to prevent damage to your hands when removing the FAN unit.
Step 3 Install the new unit, tighten the screws on the unit until the tightening torque reaches 0.6 N·m.
Step 4 Check whether the new unit is functional according to the status of the LEDs on the unit. For
details about the status of the LEDs, see FAN.
Step 5 Inform the M2000 administrator that the replacement is complete, and then instruct the
administrator to perform the following operations:
1. Check and ensure that no alarm related to the unit is generated. For details, see the related
LMT User Guide.
2. Manually synchronize the inventory information. For details, see the M2000 Operator
Guide.
Step 6 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.
5.7 Replacing the UTRP
The Universal Transmission Processing unit (UTRP) is the BBU transmission extension board.
Replacing the UTRP may disrupt all the services carried on the base station.
Prerequisite
The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, Phillips screwdriver,
ESD box or bag, dustfree cloth, and key to the cabinet door are ready.
5 Replacing Components of the BBU3900
BBU3900
Hardware Maintenance Guide
5-12 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2010-06-05)
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