Tait P25 CG, Инструкция по установке и эксплуатации

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78 Replacing Modules TB9100/P25 CG Installation and Operation Manual
© Tait Electronics Limited January 2007
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.
Important
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 undefined. 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.
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 out-
put (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 TB9100, follow
these steps.
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).