88 Replacing Modules TB8100 Installation and Operation Manual
© Tait Electronics Limited June 2005
6.2 Preliminary Disassembly
Hot-pluggable
Modules
The reciter, PA and control panel are hot-pluggable and can be removed
from the TB8100 BSS without powering down the whole BSS. These
modules can also be removed without disrupting the system control bus
communications with the other modules in the BSS.
Important In base station systems which use a PMU, the PMU must
be connected to the system control bus at all times. The
I
2
C current source is located in the PMU, and if the PMU
is disconnected, the state of much of the bus will be unde-
fined. This may cause corrupted data to be present on the
bus when the reciter reads the states of the switches on the
control panel. This in turn may result in random actuations
of microphone PTT, carrier, or speaker key, causing the
BSS to transmit or the speaker to be actuated incorrectly.
In a dual base station system, you can remove the reciter and/or PA from
one base station without disrupting the operation of the other base station.
If you want to disconnect the power before working on the BSS, carry out
the instructions in “Disconnect the Power” below.
Important Before removing a PA, disconnect the DC input and RF
input first, followed by the RF output (and DC output on
the 12V PA). After refitting the PA, reconnect the RF
output (and DC output on the 12V PA) first, followed by
the RF input, and then the DC input.
Disconnect the
Power
1. Turn off the AC b and DC c switches at the rear of the PMU.
bcdef
g
PMU 12V PA
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