Bird Technologies Group 5PI618350 Manual De Usuario

2) Gently tilt only the top of the assembly up from

the card cage. Keep the bottom of the assembly
in place. The bottom mounting plate (part of the
card cage) has an overhang on it to support the
display/user interface board. If the assembly is
lifted straight out the overhang it could possibly
damage the interface circuit board.

3) With the display/user interface board standing

up straight gently move it upwards while lifting it
out about an inch or two. This should allow the
overhang to clear the interface circuit board
without damage.

4) Remove the ribbon cable that connects the dis-

play/user interface assembly to the card cage,
see Figure 14.

5) To replace the display/user interface assembly

repeat steps 1 through 4 in reverse order.

Power Supply Replacement
The SB II power supply assembly is field replace-
able. Follow the steps listed below in sequential
order. The required tools are a #1 Phillips screw-
driver.

1) Turn off AC power at the junction box.

2) Disconnect the 3 conductor cable that brings

AC power to the supply from the junction box.

3) Disconnect the red and black leads from the

power supply that connect to the card cage.

4) Remove the Phillips screws that hold the power

supply mount bracket to the back plate and
remove the assembly from the cabinet.

5) Reverse steps 4 through 2 to install the replace-

ment power supply.

Duplexer / Filter Replacement
The filter assemblies are field replaceable. Follow
the steps listed below in sequential order. The
required tools are a #1 Phillips screwdriver with an
extended shaft to reach down far enough into the
unit to loosen the mounting screws.

Note: Power to the SB II cabinet must
b e   t u r n e d   O F F   d u r i n g   t h e   f i l t e r
replacement process.

1) All RF cables attached to the assembly must be

removed (5/16” wrench).

2) Remove the Phillips screws that hold the

assembly mount brackets to the back plate and
remove the assembly from the cabinet.

3) Reverse steps 2 and 1 to install the replace-

ment filter. 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.

Card Cage Replacement
To replace the card cage follow the steps listed
below in sequential order. The required tools are a
#1 Phillips screwdriver with an extended shaft to
reach down far enough into the unit to loosen the
mounting screws.

Note: Power to the SB II cabinet must
be turned OFF during the card cage
replacement process.

1) Disconnect the display/user interface assembly.

2) Disconnect 4 cables at the backplane of the

card cage which are assessable with the dis-
play/user interface board out of the way.

3) Remove the row of Phillips screws which hold

the card cage to the back plate. There is a row
of screws at the top and bottom of the cage.

4) To install a replacement cage perform steps 3

through 1 in reverse order.

Tuning Instructions
Tuning instructions are provided in support of field
service activities. It is assumed that the procedures
listed in this manual will be carried out by a quali-
fied electronics technician observing all standard
safety practices.

The amplifier assemblies used in the model 61-
83B-50-XXX-XX signal boosters are of sufficient
bandwidth to cover the entire range of operation.
Tuning is not required. The individual filters used in
the duplexer are passive devices of rugged electri-
cal and mechanical design. They are tuned at the
factory for the original design requirements and
require no adjustment or maintenance. These
devices will stay properly tuned unless they have

NOTE

NOTE