Huawei BTS3900E GSM User Manual page 66

6 BTS3900E Maintenance
Step 2 Set the corresponding MCB on the auxiliary power supply device of the BTS3900E to OFF.
Step 3 Preferentially, cut off the external input power of the auxiliary BTS3900E power device. If time
permits, set the corresponding MCB on the auxiliary BTS3900E power device to OFF.
----End
6.3 Replacing the BTS3900E
Replacing the BTS3900E disrupts all the services carried by it.
Prerequisite
l
l
l
Context
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.
Procedure
Step 1 Set the corresponding MCB on the auxiliary power device of the BTS3900E to OFF.
Step 2 Loosen the six captive screws on the cover plate of the cabling cavity to open the cover plate.
Step 3 Remove all the cables from the BTS3900E and take appropriate insulation measures.
Step 4 Loosen the captive screws of the two contact pieces on the main bracket. Then, tighten the two
screws on the mounting plate of the BTS3900E.
6-4
NOTE
Before powering off any of the cascaded BTS3900Es,assess the possible impacts on the lower-level
BTS3900E. This helps prevent the ongoing services from being disrupted.
The quantity of the BTS3900Es to be replaced is checked, and new BTS3900Es are ready.
The BTS3900E cable connections are recorded.
The user service tool kit is ready.
CAUTION
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
BTS3900E GSM
User Guide
Issue 01 (2010-01-15)