Mine does exactly that but only for some CDs, so I put up with it! I found it works best with older CDs from my collection, for some reason. Have you tried a variety of CDs? Was a CD inserted when you ran test mode (I think it should be).
An un-educated guess would be problems with capacitors on the servo board – this it what causes similar disc-reading problems in other B&O CD players. Hopefully someone with Beosound 1 experience will be able to help further.
The service manual isn’t much help as it just recommends board replacement!
