----End
Postrequisite
After replacing the PSU, check the following items:
l
The power LED on the PSU is ON (green) after the PSU is powered on.
l
On the M2000 or LMT, the related alarms are cleared.
l
Contact the local Huawei office to handle the faulty PSU.
5.11 Replacing a WRFU Module
This describes how to replace WRFU. The WRFU is located on the top of the BTS3900 cabinet.
The WRFU provides the following functions: modulation and demodulation of baseband or RF
signals, data processing, and signal combination and division. The replacement of the WRFU
disrupts the services carried on it. It takes about 10 minutes to replace a RFU module.
Prerequisite
l
The type of the faulty WRFU module is obtained, and a new WRFU module is available.
l
The new WRFU module is intact and the hardware version of the new WRFU is consistent
with that of the faulty WRFU module.
l
The required tools and materials are ready. They are a torque wrench, an ESD wrist strap,
a Phillips screwdriver, an ESD box or bag, dustfree cloth, the key to the cabinet door, and
the standard handle.
Context
CAUTION
l
Take proper ESD prevention measures, for example, wear an ESD wrist strap or ESD gloves
to prevent the boards, modules, and electronic components from being damaged by the static
electricity generated by the human body.
l
Hold the RFU module with care as it is heavy.
Procedure
Step 1
Locate the faulty RFU and then run the
BLK BRD
command on the LMT to disable the faulty
WRFU.
NOTE
This step can be performed either locally or remotely. Remote maintenance is suggested, though.
Step 2
Set the RFU switch on the DCDU-01 that corresponds to the RFU to OFF. The position of the
RFU is shown in
.
BTS3900 WCDMA
Site Maintenance Guide
5 Replacing Components of the BTS3900
Issue 07 (2009-08-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-19