In the first instance, I would check the datalink cable carefully, and pay particular attention to whether pins 6 and 7 are screwed fully in.  Maybe check continuity with a multimeter.

My BeoMaster 6500 is connected to the MCL/ML converter with just the Audio Aux Link cable. And it works perfectly. I bought that cable from SoundsHeavenly, it actually is a Powerlink mk 2 compatible - Black (8 pin DIN cable with fully wired 8 cores) with the central pin snapped off.

Hope this helps!

using the TV/AUX socket on the BeoMaster and the Audio Aux Link socket on the converter

@Lars

I have been using a similar setup (with a 1611) for many years without any issues using only the Aux-cable.

As already noted, I would look for the quality of the Aux-cable!!! Please try a different one.

Also it is important that - when you turn on the devices after connections are made - you turn on/power on the 1611 as the last device.

If this does not help, you should look for the ML connection - do you have a junctionbox between the devices?

MM

Thanks for your replies...

I guess I have to check the aux link cable once again.
The current is a newly made cable created according to:

http://www.abo-center.dk/Abo_center_2/reptips/diagrammer/B&o%20kabler/2005-05-27_220900_7_Pol_Din_Aux_line_kabel.jpg

I tried with another old aux link, which act the same way.

The masterlink is assembled with a juctionbox, which is checked for connection issues... my first suspect :)

I will return, when I have tried out alternative cables.