Hello, I'm new here. Allow me to apologise for my English. I have a similar problem. Sometimes, randomly, the SAM-200 is recognized, other times no. The FM-750 show the message: "Error SAM-200, cod #13". The error #13, in the manual it is said that it is for substitute the SAM-200. I opened the SAM-200, apparently the board is ok, but one capacitor was without the wiring, I soldered this and the problem continues. Anybody have a idea?