Thank you very much Peter!!! Yes, this seems to be the correct page of the instructions for my 2000.

Hi Everyone, I just completed my first B&O purchase with the arrival of a Beocom 2000 that I bought from ebay. My situation is this: underneath the cover, there is only one red dial. The manual shows two, the top for "tone ringer switch" and the bottom for "tone/pulse switch". There is only a black cover where my tone ringer