TB8100 Service Manual Power Management Unit Disassembly and Reassembly 251© Tait Electronics Limited September 200614.2 Mechanical OverviewThe TB8100 PMU is made up of a number of individual boards and cardswhich comprise two main modules, the AC module and the DC module.The auxiliary power supply board is optional.The PMU is available in three main hardware configurations:■ AC PMU (AC input only)■ DC PMU (DC input only)■ AC and DC PMU (both the AC and DC modules are fitted to allow bothAC and DC inputs).The table below provides an overview of the major mechanical differencesbetween these three configurations.Figure 16.1 on page 269 and Figure 16.2 on page 270 identify the mainmechanical parts. Figure 13.1 on page 218 identifies the individual boardsand cards, and shows how they are configured in an AC and DC PMU.“Identifying the PMU” on page 217 explains how to identify the model andhardware configuration of a PMU from its product code.Note For the sake of simplicity and clarity, the instructions and illustra-tions in this chapter refer to the AC and DC PMU. However, theAC PMU and DC PMU can be disassembled and reassembledusing the same basic procedures and techniques.Part/AssemblyPMU ConfigurationAC PMU DC PMU AC and DC PMUAC module standard module fitted AC converter board is mountedon special brackets which alsocover the holes normally coveredby the AC module heatsinks; onlythe current sense and output filtercircuitry is placed on the boardstandard module fittedDC module not fitted standard module fitted standard module fittedshield fitted not fitted fittedfront and rearpanelsfitted with blanking platesto cover the holes normallycovered by the DC moduleheatsinksfitted fittedtop and bottomcoversfitted fitted fitted
