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II.I.0 INDICATOR NAMEPLATE <br />The function of the nameplate is to identify the channels, status of each channel, status of <br />the LED alarm indicators. Access is provided to the adjustment trimpot for the vapor alarm. This <br />aluminum panel also aids in heat dispersion for the power supply. <br />I1.1.D D.C. POWER SUPPLY <br />A 12 VDC power supply provides the power for operation of the channel cards and other <br />components of the mother board. This power supply is mounted to the base plate and is not <br />field replaceable. <br />II.I.E MOTHER BOARD <br />A mother board is provided for interfacing with the individual channel PC cards P/N USD PC - <br />58E, and input connections from each Zener Safety Barrier. The mother board is not a field <br />replaceable part. <br />LA -04 MOTHER BOARD DIAGRAM <br />MASTER RELAY CARDEDGE CONNECTOR <br />> (L <br />ID 0 z 0 0 > < 0 <br />0 <br />IKI J -RBLUE —BLUE =xBLUE BLUE <br />=WHITE t=WHITE cxWHITE c WHITE <br />0 =1RED =RED BRED RED <br />+1 <br />1-1 CW b <br />U 4= <br />+ <br />0 0 0 <br />L <br />1 CH <br />41 CH2 CH3 4 <br />ASO A/0 A/0 <br />Arro umm Inn mm <br />Fm;Q <br />5 <br />