Figure 5-7 Disconnecting Cables; Figure 5-8 Removing The Upeu - Huawei BBU3900 Hardware Maintenance Manual

5 Replacing Components of the BBU3900
Step 2 Power off the BBU. For details, see Powering Off the BBU3900.
Step 3 Wear an ESD wrist strap or a pair of ESD gloves.
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 4 Record all the cable connections on the panel of the board to be replaced.
Step 5 Disconnect the power cable, monitoring cable and alarm cable on the UPEU. as shown in
5-7.

Figure 5-7 Disconnecting cables

Step 6 Remove the two M3 screws on the panel, and then remove the UPEU, as shown in
5-8.

Figure 5-8 Removing the UPEU

Step 7 Install the new board, tighten the screws on the board until the tightening torque reaches 0.6
N·m, and then reconnect the cables.
Step 8 Power on the BBU. For details, see Powering on the BBU3900.
Step 9 Check whether the new board is functional according to the status of the LEDs on the board.
For details about the status of the LEDs, see UPEU.
Step 10 Inform the M2000 administrator that the replacement is complete, and then instruct the
administrator to perform the following operations:
5-8
CAUTION
Replacing the UPEU disrupts all the services carried by the base station if no standby UPEU
is configured.
WARNING
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Copyright © Huawei Technologies Co., Ltd.
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BBU3900
Hardware Maintenance Guide
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Issue 03 (2010-06-05)