SECTION IISYSTEM COMPONENTSNOTE: MAIN UNIT POWER MUST BE TURNED OFF WHEN REMOVING/REPLACING MODULES ANDCIRCUIT CARDS, REPLACING FUSES OR DISCONNECTING/CONNECTING ANY INTERNAL CABLES.1.0Main UnitThe Main Unit (Fig. 1) performs all multiplexing, data processing, display formatting, alarm detection, andkeyboard processing. it consists of the following major internal circuit cards/modules: (Refer to Dwg. 23705 for thephysical locations of these sub-assemblies.)NOTE:THE PRINTED CIRCUIT BOARDS CONTAIN SOME COMPONENTS THAT ARE SENSITIVE TO STATICELECTRICITY AND THEREFORE MUST BE HANDLED WITH THE PROPER PRECAUTIONS:1.Hold board only by the edges and do not touch the individual components or back plane.2.When storing a board, always place inside the protective bag supplied with it.3.Lay boards only on a flat surface and on top of the protective bag.1.1Process and Display Circuit Board, (bottom board on Main Unit Door).This contains the central processor unit which controls the overall system operation, the memory which holds thesoftware program and data base parameters, the video display processing and the communication link between theInput Board and itself.Section 2 - Page 1
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