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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 />11.1.13 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 />11.1.E MOTHER BOARD <br />A mother board is provided for interfacing with the individual channel PCcards 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 />Q <br />0 <br />L--1 <br />L --J <br />0 z Z <br />=RBLUE <br />=WHITE <br />0 <br />=RED <br />0 <br />+1 <br />CW <br />+ <br />Q <br />0 <br />L--1 <br />L --J <br />