I've just bought a Beomaster 5000 and a Beocord 5000 from a couple of different sources. The beocord 5000 only has 5 pins in its DIN plug and isn't being controlled by the Beomaster 5000. The cable is hardwired into the Beocord 5000, but I was expecting a 7 pin plug. Is the plug wrong or is there something else that I can check? Thanks John