Tait TB9100 Installation And Operation Manual

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Tait TB9100 Installation And Operation Manual Manual pdf 75 page image

TB9100 Installation and Operation Manual Replacing Modules 75© Tait Electronics Limited May 20067 Replacing ModulesCaution The TB9100 PA and PMU weigh between 10.1lb(4.6kg) and 12.8lb (5.8kg) each. Take care whenhandling these modules to avoid personal injury.Important The cooling fans are mounted on the front panel and willonly operate when the panel is fitted correctly to the frontof the subrack. To ensure adequate airflow through the basestation, do not operate it for more than a few minutes withthe front panel removed (e.g. for servicing purposes). Boththe PMU and PA modules have built-in protectionmechanisms to prevent damage from overheating.7.1 Saving the Base Station’s ConfigurationBefore replacing a module in the TB9100 base station, you should decidewhether you need to save its configuration data. If you are unsure whetheryou have a record of the configuration, use the CSS to read the base stationand save the configuration file before removing any modules. Once you havereplaced the module, you will be able to restore the original configurationby programming the saved configuration back into the base station.If one or more of the modules is faulty, you may be unable to read the basestation. In this case, you will have to restore the configuration from aback-up file. Refer to the CSS documentation for more information.7.2 Preliminary DisassemblyHot-pluggableModulesThe reciter, PA and control panel are hot-pluggable and can be removedfrom the TB9100 without powering down the whole base station. Thesemodules can also be removed without disrupting the system control buscommunications with the other modules in the base station system.Important The PMU must be connected to the system control bus atall times. The terminating circuitry for the bus is located inthe PMU, and if the PMU is disconnected, the state ofmuch of the bus will be undefined. This may causecorrupted data to be present on the bus when the reciterreads the states of the switches on the control panel. This inturn may result in random actuations of microphone PTT,carrier, or speaker key, causing the base station to transmitor the speaker to be actuated incorrectly.