Figure 5-2 Loosening The Screws - Huawei BTS3900 V200R010 Site Maintenance Manual

BTS3900 WCDMA
Site Maintenance Guide
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Context
This board is hot swappable.
It takes about three minutes to replace a UBFA, which involves removing the faulty UBFA,
installing the new UBFA, and waiting for the new UBFA to start working properly.
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Procedure
Step 1 Loosen the screws on the panel of the UBFA, as shown in

Figure 5-2 Loosening the screws

Step 2 Remove the faulty UBFA from the slot.
Issue 07 (2009-08-30)
The installation position of the faulty UBRA and status of the LEDs on the UBFA are
recorded.
The required tools and materials such as ESD wrist strap/ESD gloves and ESD box/ESD
bag are kept ready.
CAUTION
Take correct ESD prevention measures, such as wearing an ESD wrist strap or ESD gloves,
to avoid static damage to boards, modules, and electronic components.
Replacing the UBFA causes the temperature of the BBU increases, which results in the
overtemperature alarm.
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5 Replacing Components of the BTS3900
Figure 5-2.
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