Bird Technologies Group 61470A Benutzerhandbuch

Signals boosters manufactured by Bird Technolo-
gies can perform for years with little maintenance
and repair. However, if the amplifiers are subjected
to excessively high signal levels, power surges or
lightning strikes, failures may occur. The following
procedures may be followed for detecting a mal-
functioning subassembly or as part of a periodic
maintenance program.

1) Heatsink areas should be clear of dust and

debris.

2) Inspect the unit to see that all LED indicators

are illuminated correctly. Check all hardware
and cable connections for tightness.

3) Compare system performance to initial perfor-

mance levels measured when the system was
installed.

The SBIII power amplifiers are field replaceable.
Follow the steps listed below in sequential order.
The required tools are a 3/32” hex head driver.

1) Turn off power to the signal booster.

2) Disconnect the 28 VDC power cable.

3) Disconnect the COM cable.

4) Disconnect the RF In cable.

5) Disconnect the RF Out cable.

6) Remove the 12 hold down screws (3/32” hex

head) that hold the power amplifier assembly to
the cabinet. The screw heads are accessible
from the heatsink side of the assembly. Refer to
Figure 24.

7) Remove the assembly by puling it away from

the cabinet.

8) To install the replacement amplifier reverse

steps 7 thru 2. When replacing the RF cables
do not overtighten the SMA connectors. They
should be tightened just slightly more than hand
tight or to the specification of 7 in/lbs. The
amplifier assembly comes with an O-ring gasket
which must press up against the outside of the
cabinet firmly and squarely in order to provide a
correct moisture seal.

Figure 24: Remove mounting screws to detach power amp from cabinet.

Remove Screws

Remove Screws

Remove

Screws

Remove

Screws