Replacing The Dcdu-03B - Huawei BBU3900 Hardware Maintenance Manual

BBU3900
Hardware Maintenance Guide
Step 6 If the PMU needs to be replaced, set the DIP switch on the new PMU according to the settings
of the DIP switch on the faulty PMU. If required, query the information about the DIP switch
by referring to AC/DC Power Equipment.
Step 7 Install the new component.
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Step 8 Check whether the AC/DC power equipment works properly according to the status of the LEDs
on the AC/DC power equipment, BBU, and RRU.
Step 9 Power on the AC/DC power equipment.
Step 10 Take off the ESD wrist strap or gloves, and then pack up all the tools.
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Postrequisite
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4.3 Replacing the DCDU-03B

The DCDU-03B distributes DC power to different components. Replacing the DCDU-03B
disrupts the power supply to the entire base station and all the services carried by the base station.
Prerequisite
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Context
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Issue 03 (2010-06-05)
NOTE
If you have confirmed that the subrack is faulty and needs to be replaced, you must remove the
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PDU, PSU, and PMU before removing the subrack from the cabinet.
If you have confirmed that the entire AC/DC power equipment is faulty, you only need to remove
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the AC/DC power equipment from the cabinet.
Install the AC/DC power equipment or subrack, tighten the screws on the mounting ears
until the tightening torque reaches 2 N·m, and then install related cables.
Install the PDU, PSU, or PMU, tighten the screws on the panel until the tightening torque
reaches 0.55 N·m, and then install related cables.
NOTE
For details about the status of the LEDs on the AC/DC power equipment, BBU, and RRU, see the
corresponding hardware description document.
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.
Fill in the fault form with the details of the replaced component.
Contact the local Huawei office to handle the faulty component.
The tools and materials, such as an ESD wrist strap or ESD gloves and M6 screwdriver,
are ready.
The quantity and type of module to be replaced are confirmed, and the new modules is
ready.
The authorized personnel are permitted to enter the site. The required keys are available.
Figure 4-13 shows the position of the DCDU-03 in the OMB.
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4 Replacing the Components in the OMB
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