Issue Installing a used CPU with unknown programming. Solution CPU can have the RAM cleared. Procedure: * This should be done with the CPU off the panel. With the CPU removed off the panel, remove the shroud; find CR2 and U8 on the circuit board. Place a 3 sec short across the banded end of CR2 and the center pin of U8. This will erase ALL Ram memory. Part numbers D8105, D8107, D8112, D8112A, D8112E, D8112E1, D8112G, D8112G1, D8112G2
