Tait TB9100, Installation And Operation Manual

Page: 86 / 144

86 Replacing Modules TB9100 Installation and Operation Manual
© Tait Electronics Limited May 2006
7.9 Replacing the Subrack Interconnect Board
There are two types of subrack interconnect board available, as follows:
■
for base stations with PMU
■
for base stations with 12V PA
Figure 7.2 on page 87 shows the two types of board, and “Switch settings”
on page 87 explains the settings for the switches on the 12 V PA
interconnect board.
Removal
1. If you have not already done so, carry out the instructions in “Pre-
liminary Disassembly” on page 75 , and remove the control panel, as
described in “Replacing the Control Panel” on page 77 .
2. Disconnect any system control bus cables.
3. Remove the M3 nuts and spring washers
b
securing the interconnect
board to the subrack, as shown in Figure 7.2 .
4. Remove the board. If you are changing the type of board, also remove
the insulator
c
.
Refitting
1. If previously removed, replace the insulator. If you are changing the
type of board, you must fit the matching insulator.
2. Refit the board and secure with the M3 nuts and spring washers.
3. If you have fitted a 12V PA interconnect board, set the switches of S1
d
as described in “Switch settings” on page 87 .
4. Reconnect the system control bus cables as shown in Figure 7.2 .