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DBS3900 LampSite
Installation Guide

7 Installing a pRRU3901

Issue 08 (2016-05-30)

Huawei Proprietary and Confidential

Figure 7-11

Drilling holes and installing expansion bolts

Step 4 Lead the M6x50 screws through the washers, and then through the drilling holes on the

mounting bracket to the plastic expansion sleeves, and use a torque screwdriver to torque the
screws to 5

N•m, as shown in Figure 7-12.

Figure 7-12

Installing the mounting bracket

If the screws cannot be tightened using a Phillips screwdriver, use a hex key or an electric screwdriver to
assist the installation.

Step 5 Fit the four hooks of the pRRU3901 into the mounting holes on the mounting bracket and

then press the pRRU3901 downwards until a click is heard. See Figure 7-13.