Tait TB9400 Installation And Operation Manual

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Tait TB9400 Installation And Operation Manual Manual pdf 102 page image

DRAFT 4102 Replacing Modules TB9400 Installation and Operation Manual© Tait Electronics Limited September 20118.6 Replacing the Front Panel FansThe following instructions refer to Figure 8.1 on page 104.Important You must replace each fan duct assembly in its original loca-tion in the front panel. Each module, or pair of modules,requires a specific type of fan duct to ensure the cooling airflow passes directly through the modules’ heatsinks.If a cooling fan has failed and you are fitting a replacement front panel, youmust also fit the correct type of front panel for that base station. Each typeof base station has a different combination of modules, and must use a frontpanel fitted with fan ducts that match those modules.The front panel for a 100 W base station has different fan ducts from thefront panel for a 50 W base station, as shown in Figure 8.1. In a 50 W basestation, the fan duct for reciter and PA 1 is slightly different from the ductfor reciter and PA 2. Each duct is designed to fit only in its correct position.Removal 1. If you have not already done so, carry out the instructions in “Pre-liminary Disassembly” on page 95.2. Reciter and 50 W PA Fana. Unplug the fan from the front panel board ( b or c ).b. Remove the four screws labeled d or e and remove the fan ductassembly from the front panel.c. Remove the fours screws holding the fan into the duct andremove the fan.3. 100 W PA Fand. Unplug the fan from the front panel board f.e. Remove the four screws labeled g and remove the fan ductassembly from the front panel.f. Remove the fours screws holding the fan into the duct andremove the fan.4. PMU Fana. Remove the 100 W PA or reciter and 50 W PA 2 fan duct assemblyas described above.b. Unplug the PMU fan from the front panel board h.c. Remove the two screws labeled i and remove the PMU fan ductassembly.d. Remove the fours screws holding the fan into the duct andremove the fan.