124 Replacing Modules TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
9.2 Preliminary Disassembly
Hot-pluggable
Modules
The reciter, PA and front 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
other modules in the subrack.
Notice Before removing a PA, first disconnect the DC input, transmit
forward input and transmit reverse output, followed by the RF output.
After refitting the PA, reconnect the RF output first, followed by the
transmit forward input, transmit reverse output, 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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