Yes, because of this I asked that, for if you need to know how to find them, that I give you the right steps for beginning, and to know where we start! So then let us find at first the 2 screws for opening on your intercom, where one of the two is the opening screw and the other the gnd screw, for finding them, please take a short isolated wire (about 10 cm) and take some isolation off from both ends, now hold one end of the wire on the first screw on the intercom where a wire (from out of the wall) is connected, and hold the other end to the next screw where a wire is connected, if the opening mechanism goes on from itself now, when connecting the two screws with the wire, then you have the right two, if not hold the wire on the next screw, and do this until you have the right two screws, where the opening mechanism goes on when you connect them with the wire, and notice the numbers of this two screws! Write here when done, and I give you the next steps!