96 Replacing Modules TB9100/P25 CG/P25 TAG Installation and Operation Manual
© Tait Limited March 2014
7.2 Preliminary Disassembly
Hot-pluggable
Modules
The reciter, PA and control panel are hot-pluggable and can be removed
without powering down the whole base station. These modules can also be
removed without disrupting the system control bus communications with
the other modules in the subrack.
Notice The PMU must be connected to the system control bus at all
times. The terminating circuitry for the bus 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 base station to transmit or the speaker to be actuated
incorrectly.
Notice 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.
Disconnecting the
Power
If you want to disconnect the power before working on the base station,
follow these steps.
Caution Before disconnecting the battery supply leads from the
PMU, open the circuit breaker or disconnect the supply leads from the
battery.
1. Turn off the AC
b and DC c switches at the rear of the PMU.
2. Also at the rear of the PMU disconnect the mains
d and battery e
supply leads, and the auxiliary DC supply lead
f (if fitted).
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