> I found it. It`s this thing: > > https://drive.google.com/open?id=0B4pq0-BHd2x6Und4QVJQdGoyaFE
That is the receive magnet. An electromagnet coil that is supposed to be turned on an off by the incoming serial bits The complex camshaft arrangement samples the state of that in the middle of every bit-time and effectively does the serial to parallel conversion. OK, it should be being fed by a DC current. There is a subchassis on the call control unit wiht a 9 pin (I think) molex plug on the side. It contains a plug-in PCB, a transformer and a capacitor. That's where you should be looking. Perhaps the capacitor has dried up so there is excessive ripple on the supply lines. -tony
