Hello fellow beoworlders!

I am looking for some help regarding my new system, and this seems like the most appropriate section to post it.

The post on my new Beosystem 5000 can be read here.

I am having mixed luck in getting the Beogram to operate correctly.
I am aware that the stylus is past its best, and will need re-tipping in the very near future.
Meanwhile, I need to mitigate a mechanical (or possibly electrical) fault with my Beogram.

The Beogram plays the record fine, until i come to lift the arm, no matter whether I press "lift","<<",">>", or "stop" the arm will lift like it is supposed to, and then lower back down onto the record straight away.

If I press "stop", the arm will raise, lower, and then attempt to return to the rest position by scraping the needle across the record's surface, and the aluminium surface of the deck, the arm will then move back and forth, up to the edge of the record, and back to the rest position continually, until the Beogram is unplugged.  The arm can then be raised manually by removing the platter, engaging the solenoid, and rotating the flywheel.

At first, one would think that this is a mechanical issue with the Beogram, but further tests have suggested otherwise...

I have tested the Beogram in various configurations, and reported my findings below...

• Beogram NOT Connected To Beomaster                             =   No Problems 
• Beogram Connected To Beomaster Phono Socket            =    Arm Lifting Problem 
• Beogram Connected To Beomaster Phono Socket            =    Arm Lifting Problem
  (WITH BEOMASTER DISCONNECTED FROM MAINS)     
• Beogram Connected To Beomaster Tape 1 Socket             =   No Problems 
• Beogram Connected To Beomaster Phono Socket             =   No Problems
  (WITH PINS 6 & 7 REMOVED FROM DIN PLUG)          

These results have lead me to think that the fault lies within the Beomaster and NOT the Beogram itself?

The problem only occurs when the DATA pins 6 & 7 are present, and connected to the Phono socket.

Multiple searches through the forums, archived forums and google have proven to be unsuccessful.

Has anyone ever experienced anything like this before, and does anyone have any suggestions?

Thank you in advance.