Fire-Lite UDACT F Field Software Change Procedure

Field Software Change 50317 Rev A 6 28 95 ECN 95 294 Change procedure outlines the mechanical installation steps required to install a PROM in the UDACT F precautions for integrated circuits electricity can destroy integrated circuits ICs To prevent damage to the PROM a wrist strap and a PLCC IC insertion extraction tool is highly recommended The manufacturer cannot be respon for damage to the PROM as a result of improper handling Power Sources remove power before working on the UDACT F Circuit Pin Conversion proper orientation of any IC removed or installed Note location of Pin 1 with respect to the corner and dot on the body of the IC and the relationship to the flattened corner on the IC socket replacement PROM must be installed in the same manner as the PROM removed Failure to observe orientation will result in destruction of the PROM Pin 1 Corner Pin 1 Corner Replacement proper orientation of any IC removed or installed To replace the PROM complete the following steps Remove power before replacing the PROM Carefully remove keypad from main board to expose PROM U23 Note that the four legs of the snap into the main circuit board and a ribbon cable located at the bottom of the keypad the keypad to the main circuit board Locate U23 lower right of the board Gently loosen and remove the PROM from U23 Install the replacement PROM in location U23 Observe proper orientation The dot on the IC be positioned to the left and the flattened corner of the IC should align with the flattened of the socket Use care to insure that the PROM s pins are not bent or broken during Carefully replace keypad into main board Reapply power U23 and Testing and test the UDACT F after PROM replacement of 3 50317 Rev A ECN 95 294 6 28 95 Changes following Table summarizes the UDACT F software changes specifying these changes by Number and Release Number Release Summary of Changes Release Remote Station improve sine wave generator function prohibit improper into the 24 hour clock 50317 Rev A ECN 95 294 6 28 95 of 3